ML20087J666

Followup Part 21 Rept Re Nuclear Valve/Actuator Stroking Time Possibly Lengthened Beyond 15 When Using hydrocarbon-based Lubricants.Ltrs to Affected Utils Encl

ML20087J666
Person / Time
Site:	Saint Lucie, 05000000, Hartsville, Phipps Bend
Issue date:	03/08/1984
From:	Adam Wilson HENRY PRATT CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
REF-PT21-84-166-000 CAR-0023, CAR-23, PT21-84-166, PT21-84-166-000, NUDOCS 8403230028
Download: ML20087J666 (6)

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HENRY PRATT COMPANY ei entive engis trer itig Ibi- (*lui(I syster nis 101 NOLTIl filGill AND.WICNt?Is AUltOltA. If JJNOlH (MGT7 March 8, 1984 Nuclear Regulatory Commission Region 3 Office 799 Roosevelt Road Glen Ellyn, Illinois 60137 Attention:

Mr. James G.

Keppler, Director Office of Inspection and Enforcement

Subject:

G. II. Bettis 10CFR Part 21 Report No. CAR #0023 ADVISORY NOTIFICATION

Dear Mr. Keppler:

This letter is a follow-up to our notification to you on February 20, 1984.

IIenry Pratt Company has reviewed G.H. Bettis and Pratt records and identified potentially affected actuators.

Potentially affected nuclear valvc/ actuators as originally supplied by Pratt for use in domestic nuclear plants were furnished to Florida Power and Light - St. Lucie #2 and TVA - S tride (Hartsville and Phipps Bend).

Attached please find copies of letters of notification to these utilities identifying such valve / actuators.

Also en-closed is a revised copy of CAR #0023 dated February 13, 1984.

Very truly yours,

</['

A.

K. Wilson Vice President Manager of Engineering AKW/np Enclosures CC:

II. C.

Schwenk l

G. A. Kurkjian W. A. Amundsen I

B. R. Cummins f4 R.

Kane, G.H.

Bettis gV')jf l

T. J. Petermann cl i

C. A. Chandley, TVA g

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Florida Power & Light c/o Ebasco Services, Inc.. Agent 1111 So. Federal Highway S tuar t, FL 33494 "

Attention:

Mr. Walter F. Malek s

' Supervising Mechanical Engineer

Subject:

St. Lucie #2 s

Dear Mr. Malek:

Attached please find G.H. Bettis 10CFR21 Report No. CAR #0023 Advisory Notification dated 2/13/84.

Th'is report advised that actuator stroking time may be lengthened to beyond 15 seconds by the swelling action.of ethylene propylene seals when used with hydrocarbon based lubricants (Mobilgrease 28).

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Review of Pratt/Bettis records indicates tliat the below listed actuators furnished with Pratt valves may be a.ffected.

.s Pratt Job Nc.

Otv.

Bettis Model Valve Tag No.

D-0096-10 2

N721C-SR40-as-M3 1-FCV-25-20&21 D-0096-ll 1

] N721C-SR40-12-M3 1-FCV-25-26 D-0095-4 4

T310-SR-5 1-HCV-14-1,2,6&7 Please evaluate the safety impact of this information as related to your application of these valve / actuator assemblies.

l Instructions for corrective action are included on Page 2 of the G.H. Bettis 10CFR21 Report No. CAR #0023 dated February 13, 1984.

Very truly yours, M

B. 'R. Cummins Quality Assurance Manager Fnclosure CC:

A. K. Wilson R. D.

Nelson W.S.N.R.C. Region III, Glen Ellyn, IL T. J.

Petermann R.

Kane - G.H. Bettis

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-1G) SOUTIl tilGill.\\NI).Wl?.NI'M ACIMill\\. IlJ JMilS M W U March 8, 1984 Mr. C. A. Chandley Chief Mechanical Engineering Branch Tennessee Valley Authority W7Cl26 400 West Summit Hill Drive Knoxville, TN 37902

Subject:

TVA/ Stride (Hartsville & Phipps Bend)

Dear Mr. Chandley:

Attached please find G.H. Bettis 10CFR21 Report No. CAR #0023 Advisory Notification dated 2/13/84.

This report advised that actuator stroking time may be lengthened to beyond 15 seconds by the swelling action of ethylene propylene seals when used with hydrocarbon based lubricants (Mobilgrease 28).

Review of Pratt/Bettis records indicates that the below listed actuators furnished with Pratt valves may be affected.

Pratt Job No.

Oty.

Bettis Model Valve Tag No.

D-0151-1 2

N732C-SR-100-12 P38-FF001A&B D-0151-3 8

N732C-SR-100-12 X73-FF006A&B X73-FF008A&B X73-FF010A&B X73-FF007A&B D-0154-1 2

NT-310B-SR4-12 P38-FF001A&B 8

NT-310B-SR4-12' X-73FF006A&B X73-FF008A&B X73-FF010A&B X73-FF007A&B D-0154-4 2

N722C-SR80-12 T41-FF030A'&B D-0154-5 2

N722C-SR80-12 T41-FF044&O45 D-0154-6 2

NCB725-SR80-12 P38-FF003ASB D-0154-8 2

NCB725-SR80-12 X73-FF007A&B D-0155-1 2

NCB725-SR80- 12 XG3-FF00?A&B D-0155-15 2

NCB725-SR80-12 X63-FFOG!AGB D-0157-1 2

NT310B-SR4-12 P38-FF001A&B D-0157-3 8

NT310h-SR4-12 X73-FF006A&B X73-FF008A&B

._X73-FF010A&B t

l X73-FF007A&B D-0157-4

'2 N722C-SR80-12 T41-FF030A&B D-0157-5

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N722C-SR80-12 T41-FF044&O45 D-0157-6 2

NCB725-SR80-12 X73-FF003A&B

.D-0157-8 2

NCB725-SR100-12 X73-FF007A&B

........ #jggend,

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tennessee Valley Authority Mr. C. A. Chandicy March 8, 1984 1

Please evaluate the safety impact of this information as related

/

to your applica' tion of these valve / actuator assemblies.

Instructions for corrective action are included on Page 2 of the 1,'

G.H. Bettis 10CFR21 Report No. CAR 40023 dated February 13, 1984.

It is our understanding that son,e of these valve / actuator assemblies have been transferred to other Nuclear plants.

Unless notified by you in writing to the contrary, we will assume that you will notify these Nuclear plants and we would appreciate receiving a copy of such notifications.

If we may be of further service, do not hesitate to contact us.

Very truly yours, d M.2.

B. R. Cummins Quality Assurance Manager BRC/np Enclosure CC:

A.

K. Wilson

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R. D.

Nelson T. J. Petermann R.

Kane - G.H. Bettis 5 U.S.N.R.C. Region III, Glen Ellyn, IL 4

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~ PRATTI Tennessee Valley Authority

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i Mr. C. A. Chandley March 8, 1984 Page 2 a

D-0159-1 2

NCB725-5R80-12 X63-PF009A&B D-0158-15 2

NCB725-SR80-12 X63-FF007A&B D-0164-1 2

NCB725-SR80-12 X63-FF009A&B D-0164-15 2

NCB725-SR80-12 X63-FF007A&B D-0163-1 2

NT310B-SR4-12 P38-FF001A&B D-0163 3 8

NT310B-SR4-12 X73-FF006A&B X73-FF008A&B X73-FF010A&B X73-FF007A&B D-0163-6 2

NCB725-SR80-12 P38-FF003A&B D-0163-0 2

NCB725-SR80-12 X73-FF007A&B D-0150-7 2

NCBS20-SR100-12 X63-FF007A&B D-0151-6 2

NCB725-SR80-12 P38-FF003A&B I

D-0151-8 2

NCB725-SR100-12 X73-FF007A&B D-0152-1 2

NCB725-SR80-12 X63-FF009A&B D-0152-15 2

NCB725-SR80-12 X63-FF007A&B D-0159-7 2

NCB520-SR100-12 X63-FF007A&B D-0160-1 2

NT310B-SR4-12 P38-FF001A&B D-0160-3 8

NT310B-SR4-12 X73-FF006A&B X"3-FF008A&B X73-FF010A&B X73-FF007A&B D-O'160-6 2

NCB725-SR80-12 P38-FF003A&B D-0151-4 2

N722C-SR80-12 T41-FF030A&B D-0151-5 2

N722C-SR80-12 T41-FF044&O45 D-0161-1 2

NCB7'25-SR80-12 X63-FF009A&B D-0161-15 2

NCB725-SR80-12 X63-FF007A&B D-0160-8 2

NCB725-SR100-12 X73-FF007A&B D-0163-4 2

N722C-SR80-12 T41-FF030A&B D-0163-5 2

N722C-SR80-12 T41-FF044&045 D-0167-1 2

NCB725-SR80-12, X63-FF009A&B D-0167-15 2

NCB725-SR80-12 X63-FF007A&B D-0166-1 2

NT310B-SR4-12 P38-FF001A&3 D-0166-3 8

NT310B-SR4 X73-FF096A&B X73-FF008A&B X73-FF010A&B X73-FF007A&B D-0166-6 2

NCB725-SR80-12 P38-FF003A&B D-0166-8 2

NCB725-SR100-12 X73-FF007A&B D-0160-4 2

N722C-SR80-12 T41-FF030A&B D-0160-5 2

N722C-SR80-12 T41-FF044&O45 D-0165-7 2

NCB520-SR100-12 XS3-FF007A&B i

D-0166-4 2

N722C-SR80-12 T41-FF030A&B l

D-0166-5 2

N722C-SR80-12

.T41-FF044&O45 D-0160-9 2

NCB522-SR80-12 X73-FF009A&B D-0151-9 2'

NCB525-SR80-12 X73-FF009A&B D-0154-9 2

NCBS25-SR80-12 X73-FF009A&B

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D-0157-9 2

NCB525-SR80-12 X73-FF009A&B D-0163-9 2

NCB525-SR80-12 X73-FF009A&B D-0166-9 2

NCB525-SR80-12 X73-FF009A&B

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U Henry Pratt Company 401 S. Highland Avenue F 23 L. :::'.

Aurora, IL 60>07 Attention: Mr. Bruce Cumming

Dear Mr. Cumming:

Enclosed is a copy of the previous response to the 10CFR-21 report filed by GH-Bettis on November 18, 1983. The only differences between this copy and the previously sent copies are:

1.)

The original date of distribution is now included on the Abstract page.

2.)

The Summary page at part I reflects the NT310-SR4 & 5, NT312-3R5 instead of T310-SR4 & 5, T312-SR5.

3.)

Each of the pages have been properly numbered.

We greatly apologize for the above mentioned oversights and bope this will rectify the problem.

Also note, the response sent to the U.S. Nuclear Regulatory Commission, for the above mentioned 10CFR-21 report, is identical to the response sent to you, including all updates and revisions.

If we may be of any further assistance, please do not hesitate to contact us.

Sincerely, GH-BETTIS

/

71 Richard T. Upton Manager, Research and Development Ens;ineering RTU/jw enc:

cc: W. N. Bitterman R. R. Kane A. T. Locascio S. Davis N. D. Quam

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,,,.... _. -.., n.. 7 10CFR21 REPORT NO. CAR #0023 ADVISORY NOTIFICATION FEBRUARY 13, 1984 4

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February 13,1984

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ABSTRACT Actuator stroking times can be lengthened to beyond 15 seconds by the swelling action of ethylene propylene seats when used with hydrocarbon based lubricants.

IEEE 382-1977 section 6.3, in-house testing and technical literature supplied by other organizations was used as a basis for the upgrade to Molykote 44 silicone lubricant from the synthetic hydrocarbon Mobilgrease 28 lubricant.

Pe lodically exercising of installed units can be used as a guide for determining when maintenance is required.

Henceforth, Molykote 44 will be used in the construction of all new 'N' series actuators.

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Summary GH-Bettis issued a 10CFR-21 report on November 18, 1983. This report was based on CH-Bettis laboratory testing of a series of nuclear qualified actuators. The results of these tests indicated that there existed a potential degradation of actuator stroking times related to elapsed time from original manufacture. The reason for this potential degradation of actuator performance was traced to the specific combination of seals and grease used in original manufacture. The Ethylene Propolene seals absorbed hydrocarbons from the grease causing them to swell. Seal swell increased the time required to initialize stroke. Both the seat material and grease were identical to those tested in GH-Bettis qualification report 37274 which has been submitted to and approved by all GH-Bettis nuclear customers.

Engineering analysis and laboratory testing have yielded the fo!!owing conclusions:

I.

The GH-Bettis actuators identified as having the potential of stroking speeds greater than 15 seconds are NCB Series, N52X, N72X, N73X series and the NT310-SR4 & 5, NT312-SR5. The 15 second stroking time was selected as representative of customer specifications submitted for safety related pneumatic valve actuators.

2.

The remainder of the NT series GH-Bettis actuators did not suffer degradation in stroking times beyond normal operating limits.

3.

Stroking of actuators at frequent intervals appears to inhibit stroking time degradation. Therefore," exercising" actuators at a minimum of 15 day intervals while monitoring initial stroking times will provide positive indication of actuator performance. This procedure has long been recommenced by GH-Bettis as a reliable method to minimize the effects of seal " set". Seal " set" or flattening at the contact sur face can cause jerky operation and/or leakage.

4.

Any installed actuator that fails to stroke within the time limit as origindfly specified must be serviced immediately with new seats and Dow Corning Molykote 44 lubricant.

Actuators that are presently in storage must be serviced with new seals and Dow Corning Molykote 44 lubricant prior to placing into service.

5.

Henceforth all GH-Bettis qualified actuators will be manufactured using Dow Corning Molykote 44 silicone grease.

9 09.

j Appendix A Engineering analysis, laboratory testing and consultation with many suppliers research departments have yielded a great deal of information about seals and lubricants.

The application of this information to actuators indicates that each design is effected differently. Results indicate that the NCB Series, the N52X, N72X, N73X series and the NT310-SR4 and SRS, NT312-SR5 actuators potentially can degrade to stroking times greater than 15 seconds. This projection is based on worse case analysis. The remainder of the NT series actuators are not projected to degrade in stroking time.

To explain: the actuator seals (ethylene propylene) swell when in contact with the Mobil 23 grease currently used in the manuf acture of 'N' series actuators. Seal swell increases seat loading causing greater time required to initialize motion. This problem is a function of seat contact area as it relates to the force available from the actuator piston or spring. As a result the larger the actuator the smaller the effect. In addition the magnitude of stroking time degradation is related to the elapsed time between actuator cycles. The longer the actuator remains stationary the more " set" the seals take. The " set" characteristic causes the seal to form an intimate contact with the sealing surfaces further increasing the time required to initialize stroke. Once the actuator begins to stroke, the seats begin to recover.

their original shape, thus freeing the unit up. Stroking the actuator three or more complete '

cycles using pressurize gas will cause the seals to recover sufficiently to reduce stroking' time to a minimum. No seal degradation has been traced to periodic actuator stroking, quite the opposite has been experienced.

Frequent stroking tends to extend seal life resulting in longer actuator cycle life.

Units should be stroked or exercised at intervals of no more than 15 days. Observation of initial stroke time will provide accurate interpretation of actuator condition and may be used to determine when maintenance is required. Units tnat are in storage will also benefit from this procedure which has long been recommended by GH-Bettis. This procedure is applicable to all GH-Bettis actuators and has been published under t

.itle " Operating, Storage and Maintenance Instructions for Bettis Rotary Valve Actuators" i

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(3) Refer to attached data sheets.

9,

Appendix B GH-Bettis laboratory test results and vendor supplied industry accepted specifications for lubrication have yielded the following:

Molykote 44(I) grease has ne tendency to swell ethylene propylene seals. Therefore, this grease would not centribute to stroking time degradation.

Molykote 44 grease has proven to be equal to or better than the Mobile 28(2)

. ease in resisting wear in metal to metal contact. Tests were conducted for 5000 full cycles at emblent temperature and 300 F.

Molykote remained intact in the piston cylinder area reducing seal wear.

Actuators currently supplied by GH-Bettis incorporate Mobile 23 synthetic hydrocarbon based lubricant which causes Ethylene Propylene seals to swe!!. Therefore, GH-Bettis has followed IEEE332(1973) section 6.3 which allows the substitution of materials of construction, when test results and analysis can be presented to justify the material upgrade.

Henceforth all GH-Bettis qualified actuators wi!! be manufactured using Dow Corning,;

Molykote 44, medium grade grease. This grease is being specified as a product improvement:

and has by GH-Bettis analysis and test proved it is equal to, or better than, the Mobile 28 grease currently t ed.

j Submitted by:

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Anthony T. Locescio Robert R. Kane Quality Assurance Manager Director of Engineering & Research (1),(2), Refer to attached data sheets.

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j Exhibits 1.

Dow Corning, Molykote 44 Data Sheet 4

2.

Mobile 28 Data Sheet I

3.

Operating, Storage and Maintenance Instructions for GH-Bettis Rotary Valve Actuators.

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- b January 30, 1984 9

Mr. Richard Upton R.

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Bettis P.O. Box 508 Waller, TX 77484

Dear Mr. Upton:

Attached is the ir. formation you requested on the radiation resistance of Molykote@ 44 Grease.

If you need further information, please contact me.

Regards, DOW CORNING CORPORATION i

d t.o ptAs Michael G. Kasperski Technical Service and Development 517/496-5349

/ bet 1-20 attachment i

DOW CORNING CORPORATION. MIDLAND, MICHIGAN 48640 TELEPHONE 517 496-4000 -

RADIATION The units of radiation dose might best be sammarized together with certain equivalences derived from empirical experiment.

rep = Roentgen equivalent physical Absorpti n of 83.8 ergs / gram of energy

= 1.7 x 10 slow neutrons /cm2 (pile radiation)

= 1.7 x 10 nyt,(pile radiation)

= o.838 rad

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The unit refers exclusively to neutrons and is an integrated value made up of the number of neutrons per cubic centimeter times their velocity and times the time.

The equivalence shown between rep and slow neutrons or nyt applies only to pile radiation wherein this ratio was determined.

Small doses of radiation tend to thin greases by destroying some of the bodying action of the filler.

Micro penetrometer mea

}.

ments showed the following relative increases after 2.5 x 10gure-rep.

Grease Increase in PenetroEeter I

DC 41 4 fold DC 44 3 fold lgher doses in the range of 4.7 x 109 rep would undoubtedly

'ak these greases to crumbly gels.

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Penetration Af ter Various Radiation Doses -

Dose Pene tra tion Pene tra tion Megarads Unworked Worked 60 DC 41 o

266 295 50 340 324 DC 44, light 0

- 312 329 50 325 331 DC 44, Medium o

256 255 lo 275 266 20 274

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. 291 30 289 295 40 287

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306 50 295 310 60 305 324 70 322 324 80 312 340 100 351 372 120 346 385~

140 344 425 180 344 422 DC 44, Heavy o

214 221 50 242 264 F-2

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I As shown in the following graph, radiation of silicono greases adversely affects the physical properties.

t Uith respect to radiation of Dow Corning greases' the following conclusions can be derived..

1.

At lou radiation doses the soap thickener degrades so that the grease becomes soft or soapy.

2.

- Ac graphically shown, the radiation dose required to start gelation has been reached' at' 130'E6garada for the worked sample and 180 megarada for the unworked.

The leveling of

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the curve indicates this fact.

3.

'Above 130 megarads DC 44 behaves as a high viscosity fluid after working.

4 Of the available silicone greases, DC 44 has the best radiation resistance.

The light grade appears to be the least affected' ~

by small radiation doses with heavy next and medium the most

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severely affected.

5.

Organic greases in general have greater radiatic,n resistadce than silicone greases.

s Silicone greases behave in this manner when irradiated -

Thin, Soupy A

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Rubbery A

Radiation dose h

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440 400

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j RADIATION DOSE, MEGARADS

t TYPICAL PROPERTIES OF MOLKYKOTE 33. 41 AND 44 CREASES t-These values are not miended for use m preparing specifications Molykole 33 grease Molykote 44 grease y

light Medium grease Light Medium Color Pink / Gray' Pink / Gray' Black Amber Amber Thickener......

Lithium soap Lithium soap Carbon black Lithium soap Lithium soap

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Penetratton,' worked 60 strokes.........

300 260 280

%0 260 B!eed, af ter 24 hrs at 300 F (149 C).* percent 3.5 2.0 5.0*

4 2.5 Evaparation, af ter 24 hrs at 300 F (149 C).2 percent 2.0 2.0 3.0*

1.5 1.0 Dropping Point. degrees..... 410 F (210 C) 410 F (210 C)

None 400 F (204 C) 400 F (234 C)

Dirt Count)

Pass Pass N/A Pass Pass Temperature Range.

degrees

-100 to 400 F

-100 to 400 F 0 to 550 F

-40 to 400 F

-40 to 400 F

(-73 to 204 C)

(-73 to 204 C)

(-17 to 288 C) ( 40 to 204 C)

(-40 to 204 C)

Specific Gravity at 77 F (25 C)..

0.97 0.9 L 1.14 1.05 1.05 Bomb Oxidation.* pressure drop af ter 500 hrs at 210 F (99 C), psi 2.0 2.0 2.0 2.0 Water Washout Resistance.'

loss percent 0.5 0.5 0.5 0.5 0.5 Thermal Conductivity cal /sec/cm'/* C/cm 0.00028 0.00028 0.00028 0.00028 BTU /hr/ft'/*F/en 8.13 8.13 8.13 8.13 Specific Heat:

cal /gm/* C 0.379 0.379 0.368 0.368 0.368 f

B TU/lb/* F.....

0 379 0.379 0.".368 0.368 0.368 High Temperature Bearing Performance, hrs at 10.000

}

rpms. 6-Ib radial load. 204 bearing at a00 F (204 C).

Weibull B*

320 Not Recm'd 800 Max. DN Value (Bore See in mm x rpm)

. 150.000-200.000 150.000-200.000 75.000 150.000-200.000 150.000-200.000

'The dye m Molykote 33 changes color on star'dmg. this Color

• Determined using 392 F (200 C).

siange coes not affect the serviceability of the grease

'Mll.l.15719A anc Amendment 1.

' ASTM D 217

• ASTM D 942

'Determmed with equipment described m MIL S 86608

' MIL-I 15719,A Specificatson Writers: Please contact Dow Cornmg Corporation. Midland. Michigan. before wnting.pec6fications on these products.

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T IIEEEE Mo y<o~:e@ Si icone

<,JYYL Greases

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i DESCRIPTION MOLYKOTEe 33,41 AND 44 GREASES Molykote"33,41 and 44 greases are siticone lubricalmg oils with

Type, thickeners added. Molykote 33 and Molykote 33 and 44 greases Silicone oil thickened with lithium soao

. Silicone oil theckened with carbon black 44 greases are thickened with a Molykote 41 grease m..

Pnysical l'orm Greases special lithium soap: Molykote 41 Resistant to oxidatson, moisture and Special Properties grease is thickened with carbon corrosive atmospheres; good shear stabihty, g

wide service temperature range Designed primarily for use on ball Primary uses

.......... Lubricants for antoriction bearings operating under light to bear 6ngs and plastic and rubber parts moderate loads, these greases well not thin out excessively or gum up.

• Windshield wiper motor gears of their low torque requirements, these greases are especially They are resistant to oxidation,

. Photographic. cptical and effective in equipment that must moisture and corrosive surveying equipment start In extreme coid, atmospheres. They are also enert,

• Oscillographs, geophysical, and h

have good shear stabihty, and are light, low-torque instruments Oxidation Resistance SIrviceable over a wide temperature range - Molykote 33 grease from Molykote 33,41, and 44 greases are 100 to 400 F (-73 to 204 C);

Molykote 41 grease recommended for use in units that Molykote 41 greasu from 0 to 550 F

• Antifriction bearings o' high-must remain operable when

(.18 to 288 C); Molykote 44 grease temperature equipment subjected not only to low and high from -40 to 400 F (-40 to 204 C).

• Oven conveyor bea ings operating temperatures, but also to Molykote 33 and 44 grease = are severe weathering and oxidation.

• Wheel bearings of co+e oven available in two consistencies -

carts The results of a comparison light and medium. Molykote 41 grease is available en a hght

• Pumps handling molten salts between silicone and organic

• consistency, NLGL #2. Molykote 44

• Governor linkage of steam grease is also available in a special turbines exposure to oxygea under a consistency designed to meet MIL-

• Anti-sein for bolts and studs pressure of 110 psi and a f-t S719 A.

temperature of 210 F (99 C),in the

• Knife-type electric power disonnect switches P.resence of a Mass catahst, USES silicone greases cause a pressure

• Ball and socket connections of drop of only 1.5 psi, All three Molykote greases are used l

13 lubricate ball and roller bearings power insulators HOW TO USE cperating under lignt to moderate 1: ads and at low speeds Typical Molykote 44 grease General l

c pplications include.

• Kiln preheater f ans, oven f ans, radiator cooling faris Conventional grease application Molykote 33 grease

• Textile slashers and dners methods - brushing, grease gun or

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o Freezer cart casters and cold

• Conveyor systems suitable for use with Molykote 33, room conveyor cQuipment Molykote 33,41, and 44 greases do 41, and 44 greases. Laboratory tests

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o Electnc clock motors not soften or affect most plastics and field reports indicate that o Maximum demand meters, and are used to lubricate plastic

• ' heavy duty" guns available from power factor meters, watt hour gears, bearings and cams, as well such manufacturers as Lmcoln-St as metal and rubber parts. Because Louis are preferred.

meters

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FIGUIE 1: OXIDATION RESISTANCE OF SILICONE GREASES l

SILICONE GREASES AND COMPOUNDS g 110

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50 100 150 200 250 300 350 400 450 500 Time at 210 F (99 C). hours NOTE: Extra care should be taken at all times to prevent dirt from contaminating the tubncant. These greases should be packed with a clean metal or ebonite spatula They should not be applied to

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surfaces that are to be painted.

Molykote 41 grease should not be used with highly.oaded ferrous metal bearing combinations, especially where sliding friction is encountered.

e CAUTION Temporary discomfort may be produced from eye contact with

' Molykote 33. 41 and 44 greases.

SHIPPING LIMITATIONS p

None STORAGE AND SHELF LIFE When stored at or below 90 F (32C).

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Molykole 33. 41 and 44 greases i1 ave a shelf life of 18 months from date of shipment.

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ObilCmase 28

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eei,ements of u.S. Milita,x ePecification ooo 2 s>e.

v (Navy) 11 can be designated U.S. Military Symbol WTR and NATO Symbol G 395.

Mobilgrease 28, a nonsoap, synthesized hydrocart>on fluid During the development of Mobilgrease 28, extensive labora.

4 type grease formulated to lubricate bearirigs and other mech.

tory and full scale tests were conducted. One of the most cnisms operating at high speeds and extremes of low and significant was in F 4 C Phantom Jet brake and wtieel high temperatures. Technological developments in industry assemblies in simulated rejected takeoffs. During the test, crs frequently slowrJ by the inability of existing lubricants t brake disc stack temperatures exceeded 2000F (1095C), and function satisfactonly at the temperatures, speeds or loads gg gp g g g

that are encountered in trany special applicatioris. Many of these problems became critical first in the aviation industry ~ temperatures and the accompanying heavy loads, bearings where weight and speed are major factors in design. Some l bricated with Mobilgrease 28 performed satisfactority,and both the bearings and grease were judged capable of further years ago, performance demands of some comDonents. such 8

E cs aircraft Wheel bearing assemblies. exceeded the capability of the existing specialty greases and a cooperative study U.S. Military Specification DODG24508A(Navy) describes a between Mobil and the Mildary was undenaken te find an im-lubricant for shipboard auxiliary machinery. Mooilgrease 28 proved solution to the problem. As c result of this study, synthetic grease provides grease bearing performance suffi-Mobilgrease 28, an all synthetic product, was developed. In cient to eliminate bearing relubrication between ship titcraft applications Mobilgrease 28 has been outstanding overiauls.

End its use in industrial applications of f ers a solution to many Other tests indicated that Mobilgresse 23 of f ers unique ability difficult grease lubrication problems where des:;n or to prevent friction oxidation (so-called fretting) and lubricate operrting f a: tors impose temperature, speed, or load conds.

antifriction bearings under. conditions of high loads, speeds x

tions that exceed the performance capabilities of the best and temperatures. It has also shown superior abihty to conventional greases.

lubricate heavily loaded sliding mechanisms such as wing flap screwjacks._

i PRODUCT DESCRIPTION in summary, Mob'ilgrease 28 offers outstanding performance Mobilgrease 28, a completely synthetic lubricant, is manu-over wide temperature ranges, with excellent retention and f actured f rom a synthesized hydrocarbon fluid and a nonsoao res stance to high temperature degradation, in addition, it thickener. It has extreme pressure charactenstics and ex-resists water washing, provides superior load carrying ability' c;llent resistance to water washing, as well as being eff ective reduces frictional drag, and prevents excessive wear.

over an extremely wide range of operating temperatures.

Mobilgrease 28, a synthetic grease,is dark red in color, has a APPllCATION smooth buttery structure and a consistency between an NLGI No.1 and No. 2 grease.

Mobilgrease pS, synthetic grease is recommended for the lubrication of plain and antifriction bearings at low to high The chem.ical simiiarity of the synthesi:ed hycrccarbon fluid speeds, and splines, screws, worm gears, and other cf Mobilgrease 28 to petroleum products obviates severalpro-mechanisms where high f riction reduction, low wear, and low bl;ms that have been of concern with other synthetic greases, lubricant ftlction losses are required.11 provides minimum Seal materials that are satisf actory with petro'eum products resistance to starting at extreme low temperatures (down to cr2 also satisfactory with Mobilgrease 28. In addition, shght 45F, 54C) as well as low running torque, c;ntamination of Mooilgrease 28 with a previously used petroleum type grease, while it should be avoided if practi.

Mobilgrease 28 is recommended for use in landing wheel cable, should not cause compatibility probelms that might assemblies, control systems and actuators, screwjacks, servo r;sult in excessive softening or hardening.

devices, sealedbeanag motors, oscillating bearings and heli-copter rotor bearings on military and civil aircraft and on naval Mobilgrease 28 meets the requirements of U.S. Military Specl*

shipboard auxiliary machinery, it should be used wherever a fication MIL-G41322 C Grease, General-Purpose, Aircraf t. The grease meeting U.S. Military Specification MIL G41322 C or specification describes a grease intended for use over the DODG24508 A(Navy)is specified. lt can also be used where I

temperature range f rom 65F (-54C) to 350F {177C) f or such ap-the older, superseded specifications MILG81322 (WP), MIL-plications as aircraft landing wheel assemblies, control G 7711 A, MILG35458, and MIL-G-25760A may be called for, systems and actuators, screwjacks, servo mechanisms, and will provide superior performance in all respects to pro-L sealed bearing motors, oscillating beanngs and helicopi"'

ducts qualified under these older specifications.

r: tor bearings.The specification requires that the grea,e per.

form satisfactorily for extended penods in high speed bear.

Mobilgrease 281s recommended for industrial grease lubrica-ings operating at 350F (177C), of fer icw starting and turning tion applications including sealed or repackable ball and torque at 45F (-54C), and provide good extreme-pressure and roller bearings, wherever extreme temperature conditions, frictioweducing characteristics. Mobilgrease 28 exceeds the high speeds or water washing resistance are factors. Typical regulrements of the specifica11on in all respects.

Applications where it has offered advantages are conveyor

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beirings, smail alternator bearings of.erating at temperatures should be avoided. Good personal hygiene should be prac.

, herr 350F (177C), high speed miniature tall bearings, and ticed. Removs and launder wetted clothing oefore reuse. Skin bearing situations where oscillatory motion, vibration and contacted with the proouct should be washed with soap and fr;tting create problems.

warm water. On rare occasions, hypersensitive individuals may develop skin allergies. lf this occurs, remove from f urther Mobilgt:ase 28 is capable of retaining its consistency under exposure arid seek advice of a physician, high 1:mperature and shear conditions over extended periods cf operation.Therefore,it opens opportuniiss for the design A N ES cf high output equipment. Mcbil's representative will be glad t)cssist in the exploration of new uses for this product.

Improved friction reduction TYPICAL CH ARACTERISTICS Low wear rates Physical and chemical characteristics of Mobilgrease 28 are - Lovricbricant drag shown in the tabulation that follows. Those values not snown Cs maximums or minimums are typical characteristics which Wide temperature range m:y v ry clichtly. In addition, pertinent test properties are High thermal stability giv;n to exhibit pertormance characteristics of the grease.

Compatibility with mineral oil base greases HANDLING PRECAtJTIONS No sp;cial precautions are required when handling Mobilgresise 28, however prolonged repeated skin contact High resistance to water washing p

y' Characteristic Mobilgrease 23 MIL.G-81322C Requirernents Thickener Type Nonsoap Fluid Type Synthetic Hycrocarbon Color Dark Red Structure Smooth, Buttery Penetration at 77F (25C)

Workod 60 X 285 265020 Worhed 100.000 X 310 350 max Dropping Point, F (C)(ASTM D566,IP132 500 + (260 +)

450 (232)

Rust Test (ASTM D1743)

Pass Pass Load Wear tnder, ASTM D2596. kg 40 30 min Corrosion to Copper 24 hr at 212F (100C)

None Nil Water Resistance (ASTM D1264)

% Washout at 100F .BC) 1 20 max Wear.40 kg,1 hr,120' rren ct 167F (75C) Steeion. Steel (ASTM D2266) Scar d:aw, mm 0.50 130 max Ev.poration (ASTM D9M, 22 hrs at 350F (177C). % Loss 10 12 max Oil Separation 30 hrs a! 350F (177C). %

5 10 max Low Temo. Torque (ASTM D1478) 65F (-54C) Starting / Running. gcm 6400f750 10,000/1000

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Rubber Swell, ASTM D471 L Type Synthetic 1 e c 158F(70C) 6%

15% max M;bil Oil Corporation,, covers-,n.,mm w,u,

OPERATING, STORAGE & MAINTENANCE -

INSTRUCTIONS O

FOR BETTIS ROTARY VALVE ACTUATORS i

j Bettis actuators are extremely rugged, compact and designed for use w.'.a wide range of valve sizes and types, to be used with a wide range of pressures, tempqratures ad environments.

Storage I

For applications where the actua tor is not put into immediate service (or is used in intermediate services), it is recommended that the actuator be cycled by' air or nitrogen pressure at least three (3) tmes per month. This keeps seats and packings flexiblo and insures that the valve is free. When it is not possible to cycle with air or nitrogen and a manual ovemde is available, it is recommended that the pressure inlets be unplugge'.1 so the actuator can be cycled manually. Indoor storage, if available, is recommended for all actuators. Caro should be taken to plug the cyhnder ports, control valve ports and body ports to keep out foreign particles and moss-ture. Also, actuators should not be stored in an atmosphere harmful to resilient sents t

insta!!ation Place the actuator and valve in the same position (both open or both closed) and remove any existing manual gearing from valve. At this point, check the valve and actuator mounhng surfaces, stem adapter ar:d valve stem for proper orientation and possible discrepancies. If the valve is equipped with a lubricator f,tting, remove this fit-ting and install the lubricator extension nipple fumished with the actuator. Reinsta!! the lubricator fitting in the ex-tension nipple. Install the stem adapter bushir;g,1f fumished loose, over valve stem, position set screw in place and install actuator over bushing. The actuator is usually mounted parallel to the run of the pipe. Tighten all bolts and nuta evenly, taking care to center the actuator on the valve stem. It is a good idea to cycle the actua tor while y

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the mounting bolts are somewhat loose as this will allow the unit to center itself.

l Since there are many valve and actuator combinations, it is not practical to include detailed instructior's for each type. Mountings are designed to be as simple as possible tc keep guess work out of installation. Actuators j

l are shipped from the f actory r 1 the travel stops adjusted for approximately ninety degree (90*) rotation. Gen-i erally it is necessary to make slig. t stop adjustments once the actuator is installed on the valve. Ref er to the valve manufacturer's recommendations for specific requirements. When the valve has intemal stops, the ac-tuator abould be adjusted at the same points. The actual" stepping" should be done by the actuator. If the valve does not have intemal stops, adjust the actuator to the full open posibon. Using this as a reference point, rotate the valve closed and adjust to the valve manufacturer's speofications for total rotation.

j Start-up When actuator is first put into service, slight leakage past the piston seals and/or rod packings may be detected.

This is due to the seats and packings having been held in one position tending to cause them to tako a " set". In such cases, the actuator should be operated through several cycles thereby energizing the seals and packings, resultingin aweanng in condition.

The speed of operat on wi!I be determir ed by a number of f actors includng:(1) the distance from the pressure source; (2) supply line size; W supply in pressure:(4) control valve onfice size: (5) the torque requirements of the valve: (6) the size of the actuator, etc. Due to the interacton of these variab'es it is difficult to specify a

" normal" operating time. Fast operating tmes may be obtained by usipg one ar more of the following:

(1) larger supply lines; p) iarger controf valve; (3) higher supply pressure and/or (4) quick exhaust valves.

Slower operating times may be obtained by using flow control valves to meter the exhaust. Incoming supply

)

should not be metered or exhaust I ew metered excessively, since this may cause erratic operation.

n Maintenance 1

Once installed anc praperly adjusted (SEE S TORA GE, lNS TALLA TIONAND START-UPINSTRUCTIONS) the Bettis actuator b ready for opos aton. Due to the rugged design of the actuator and lubricants used at assembly time, ruutno maintena nce is generaty unnecessary For acMators normally used in pneumate systems, all bearing surfaces are generally coated with a teflon dry-film lubncant and corrosion inhibitor. Actuaiors used primanly in hydraulic systams, the bearing surfaces are

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generally coated with a feflon dry-film iubricant and corrosion inhibitor, except for pista rods and tie bars which are electroless ni' el coated. All threaded farteners, beanng surfaces, tracks, rollers, pms, yoke bores, gaskets and seals are coated with petroleum grease. These tubncants inctease the insurance of long service hfe,1cw maintenance and troubie-free operation.

(qJ Good instrument pracaces aro also recommended. Clean, dry air, gas or hydraulic fluid is essential for long service life and satisfactory operaton it instrument air or hydraulic fluid of this quality is not available, it is rec-i ommended that an in-line fder be provided to prevent foreign partcles from entenng the cylinders of the ac-tuator. It should be noted that new air knes often have scale and other debris in them. This debns can damage control valves, solenoids, seals, etc.

Operation Normal operaton is accomplished by applying pressure to the appropriate pressure inlet (s) of a double acting or spring return cylinder by means of a proper control valve. Bettis actuators are sized to produce the required va've torque at the supply pressure designated by the customer.

All Betts actuators feature a totally enclosed body cavity that provides protection for a!! moving parts and eliminates the chance of injury to operating personnel. This enclosure may also be used as an optional oil bath, if and where required. Under most normal circumstances Bettis pneumauc actuators do not require additional lubricants but it shou!d be remembeced that most control valves and solenoids (with the exception of posi-tioners) perform better on lubricated air. For this reason, an air line lubricator may be installed. Care should be taken to use only lubncants compatble with the seals in the actuator and control valves.

For manual operation of Bettis actuators, the supply pressure must be vented or equalized on both sides of the power piston (with some provision for handling the slight difference in displacement of opposing sides of the cylinder piston).

(1) If the type of manual operator is an intemal manual, move the lever in a clockwise direction (upward and horizontal when unitis top mounted) until mechanism is engaged. With this done, the handwheel thenoperates actuatorandvalve.

(2) If the type of manual operation is a hydraulic override, rotate the handwheelin the appropriate direc-tion to operate actuatorandvalve.

p (3) If thu type of r*.anual operation is a hydraulic override on a spring retum actuator,fu!!y close block /

./

by-pass valve and operate hand pump in order to override actuator spring and operate actuator andvalve.

(4) If the type of manual is a jackscrew, simply tum appropriate jackscrew to operate actuator and valve.

Spareparts Replacement parts may be ordei ed for all Bett's actuators. Pubh hed parts list drawings include recommended rpare parts. It should be remembered that these spare parts are of resilient material and have a limited shelf life.

Other parts are generally not required as spares.

When ordering replacement parts,it is important to include the complete actuator model number and serial number along with the part numbers required. More detailed Information conceming your partislar application may be obtained by wntng GH-Bettis, PO. Box 14689, Houston, Texas U.S.A. 77021 Telephone:

713/748-1143,Telox:76-2713 a

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id A Galveston+40uston Company e

Sulletin No.10.00 2 A-