ML20054E506

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Conduit Insulation Fire Test 1
ML20054E506
Person / Time
Site: Rancho Seco
Issue date: 05/28/1982
From:
SACRAMENTO MUNICIPAL UTILITY DISTRICT
To:
Shared Package
ML20054E503 List:
References
NUDOCS 8206110289
Download: ML20054E506 (16)
v • d • e


Text

-

O CONDUIT INSULATION FIRE TEST NO. 1 A.

FURPOSE

.The purpo';c of this test is to establish the fire resistance rating of thermal insulation on conduits.

B.

TEST SET UP 1.. Install a 1" conduit and a 2" conduit in a test slab as shown in sketch No. 1.

Typical conduit installation is.shown in photo numbers 80 through.82.

2.

Insulate the conduit with 1" of calcium silicate block insulation (Fiberglass Co. Kalo) and aluminum jacket cover.

3.

Install cables in the conduit to provide maximum fill possible.

4.

Install thercocouples in each conduit to monitor the conduit wall temperature at each elbow and at the center. Thermocouple locations

,1( )

are as shown in sketch No. 1.

5.

Connect-power to all cables in each conduit to monitor wire to wire and wire to ground shorts as shown in sketch.No. 2.

6.

Place conduits in test oven and subject them to standard tine tempera-ture curve specified in ASTM E119. For detailed description of oven refer to tests on cable tray wall penetrations.

C.

TEST PROCEDURE 1.

Place test specimen on oven j

l 2.

Turn on power to test cables 3.

}bnitor oven temperature and conduit temperature 4.

Control oven temperature to conform to ASTM E119 standard 5.

Monitor indicating lights until failure occurs in both conduits.

Record time of failure.

D.

TEST NOTES AND OBSERVATIONS 1.

The following cables were in the conduits:

l 8206110289 820528 DR ADOCK 05000312 PDR

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No. of No.

of Size of

()

Brand Cables Conductors Conductors 1

1" Conduit Rackbestos Pyrotrol 1

3 16 Rockbestos Firewall III 1

2 12

?" Conduit Rockbestos Pyrotrol 1

3 16 Rockbestos Pyrotrol 1

3 12 Rockbestos Firewall III 1

2 12 Rockbestos Firewall III 2

7 12 2.

Ambient temperature at the start of the test was,58 F.

3.

The test was conducted on December 16, 1977.

4.

At the start of the cest thermocouple No. 8 appeared to be calfune-tioning. Data f rom this thermocouple is of questionable validity.

5.

Fifteen minutes after the start of the test the aluminum jacket on the insulation was melting off in several areas.

6.

Thirty-five minutes into the test the caj'ority of the aluminum jdeket

[g was melted off and gaps were starting to open up between the insulation blocks.

7.

Forty minutes into the test 100% of the aluminum jacket was celted off.

Forty-three minutes into the test the indicating lacps on the 1" con-8.

duit circuits started to glow.

The light intensity slowly increased

{

until they were at 100% brilliance at 52 minutes.

9.

Forty-nine minutes into the test the indicating lamps on the two inch conduit circuits started to glow. They reached approxicately 50% brilliance four minutes later.

t

10. The test was terminated 53 minutes af ter the start.
11. Compliance with the ASTM E119 oven te=perature requirements is shown in table one. At the end of the test the actual area under the time temperature curve deviated from the ideal by 4.1%.
12. Temperatures measured inside the conduit and in the oven are shown on the attached graphs.

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FIRE PROTECTION OF SILVER BRAZED, NSW, COPPER PIPE PURPOSE:

1.

To determine the necessity of protecting silver brazed i

pipe.

2.

To determine the performance of stainless steel jacketed, calcium silicate insulation.

3.

To demonstrate the adequacy of the Rancho Seco design.

DISCUSSION:

1. is an evaluation of dif ferent combinations of High Pressure Injection System lineups and fire loca-tions. The pipes that require exposure fire protection are included.
2. shows the performance of calcium silicate 4

insulation by test and by comparison to calculations performed on insulation with similar conductance valves.

The worst case shows that the inside of the.cond/.it reached 900*F in 50 minutes with a 1600 *F oven temper-ature. The fire exposure is less than 15 minutes at 1400*F and the silver braze melts at greater.than 1100*F.

CONCLUSION: The Rancho Seco design is adequate because:

1.

Testing uas done at 1600*F and the exposure is 1400*F.

2.

Maximum temperature reached was 900*F in 50 minutes and the silver braze melts at 1100*F and the exposure is less than 15 minutes, t

3.

The pipes which are determined to require exposure' fire protection are being insulated with 1" of calcium silicate insulation with a stainless steel jacket.

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s ATTACHMENT 1 POSSIBLE HIGH PRESSURE INJECTION LINEUPS, FIRE LOCATIONS, AND FIRE PP.0TECTION INSULATION REQUIREMENTS (Refer to Figure 1 Attached) i I

Normal Lineup - A-HPI pump aligned to A-train, B-HPI pump aligned to B-train, Make-up pump aligned to A-train.

Cross-connect line valves NSW-005, NSW-007, NSW-006, and NSW-008 open.

A.

Fire location - A-HPI pump room 1.

Event sequence A-HPI pump lost directly due to fire.

a.

b.

Silver brazed, NSW, cross-connect piping (line numbers 48752-3"-HE2 and 48762-3"-HE2) in the A-HPI pump room experiences silver braze melting.

c.

Make-up pump lost due to loss of NSW through cross-connect piping line numbers 48752-3"-HE2 and 48762-3"-HE2.

2.

Effect on plant - A-HPI and make-up pumps lost.

B-HPI pump remains operable.

3.

Fire protection insulation necessary - None B.

Fire location - B-HPI pump room 1.

Event sequence a.

B-HPI pump lost directly due to fire.

b.

Silver brazed, NSW, piping (line numbers 23953-3"-HE2 and 23963-3"-HE2) in the B-HPI pump room experiences silver braze melting.

2.

Effect on plant - B-HPI pump lost. A-HPI and Make-up pumps remain operable.

3.

Fire protection insulation necessary - None C.

Fire location - Make-up pump room 1.

Event sequence Make-up pump lost directly due to fire.

a.

_.--.r-m- - -

.,---,y,..

y-

b.

Silver brazed, USW piping (line numbers 23953-3"-HE2, 23963-3"-HE2, 48751-3"-HE2, 48761-3"-EE2, 48752-3 '-HE2 -

and 48762-3"-HE2) in the Make-up pump room experiences silver braze melting.

c.

A-HPI pump lost due to loss of.NSW tutween Make-up pump room wall and valves NSW-009 and NSW-059 in line numbers 48762-3"-HE2 and 48752-3"-HE2, respectively, d.

B-HPI pump lost due to loss of NSW between 4", main-supply / return pipes and valves NSW-Ole and NSW-060 in line numbers 48762-3"-HE2 and 48752-3"-HE2, re-spectively; and in line numbers 23593-3"-HE2, 23963-3"-HE2, 48751-3"-HE2, and 48761-3"-1E2.

2.

Ef fect on plant - A-HPI, B-HPI, and Make-up pumps lost.

No HPI available.

3.

Fire protection insulation necessary - As required to save the B-HPI capability which includes insulating the following:

a.

Line number 48752-3"-HE2 from valve ammber NSW-060 up to the 4", main return line.

b.

Line number 48762-3"-HE2 from valve number NSW-010 up to the 4", main supply line, c.

Line numbers 23953-3"-HE2, 23963-3"-E2, 48751-3"-HE2, and 48761-3"-HE2 in the Make-up pump room.

II.

Alternate normal lineup - A-HPI pump aligned to Artrain, B-HPI pump aligned to B-train. Make-up pump aligned to B-train.

Cross-connect line valves NSU-009, NSW-010, NSW-059, mul NSW-060 open.

A.

Fire location - A-HPI pump room 1.

Event sequence a.

A-HPI pump lost directly due to fire.

l b.

Silver brazed NSW, cross-connect piping (line numbers 48752-3"-HE2 and 48762-3-HE2) in the A-HPI pump room experiences silver braze melting.

c.

B-HPI and Make-up pumps lost due to loss of NSW between A-HPI pump room wall and valves NSW-007 and NSW-008 in i

line numbers 48752-3"-HE2 and 48762-3"-HE2, respectively.

2.

Ef fect on plant - A-HPI, B-HPI, and Make-up pumps lost.

No HPI available.

L

4 3.

Fire protection insulation necessary - As required to save B-HPI capabi?ity which includes insulating the following:

a.

Line number 48752-3"-HE2 from valve number NSW-007 to the A-HPI pump room wall, b.

Line number 48762-3"-HE2 from valve number NSW-008 to the A-HPI pump room wall.

B.

Fire location - B-HPI pump room 1.

Event sequence a.

B-HPI pump lost directly due to fire.

b.

Silver brazed, NSW piping (line numbers 23953-3"-HE2 and 23963-3"-HE2) in the B-HPI pump room experiences silver braze melting.

c.

Make-up pump lost due to loss of NSW through line numbers 23953-3"-HE2 and 23963-3"-HE2.

2.

Effect on plant - B-HPI and Make-up pumps lost. A-HPI remains operable.

3.

Fire protection insulation necessary - None C.

Fire location - Make-up pump room 1.

Event sequence a.

Make-up pump lost directly due te fire.

b.

Silver brazed NSW piping (line numbers 23953-3"-HE2, 23963-3"-HE2, 48951-3"-HE2, 48961-3"-HE2, 48752-3"-HE2, 48762-3"-HE2) in the Make-up pump room experiences silver braze melting.

c.

-B-HPI pump lost due to loss of NSW through line numbers 23953-3"-HE2, 23963-3"-HE2, 48951-3"-HE2, 48961-3"-HE2, 48752-3"-HE2, and 48762-3"-HE2.

2.

Effect on plant - B-HPI and Make-up pump lost. A-HPI remains operable.

3.

Fire protection insulation necessary - None III. Abnormal Jineup - A-HPI pump out of service, B-HPI pump aligned to train B, Make-up pump aligned to train A.

Cross-connect line valves NSW-005, NSW-007, NSW-006, and NSW-008 open.

I

~

A.

Fire location - A-HPI pump room l

Same as I. A except A-HPI pump is out of service - no insulation necessary.

B.

Fire location - B-EPI pump room Same as I.B except A-HPI pump is out of service - no insulation necessary.

C.

Fire location - Make-up pump room Same as I.C except A-HPI pump is out of service.

Insulation required as in I.C.3.

IV.

Abnormal lineup - A-HPI aligned to train A, B-HPI out of service, i

Make-up pump aligned to train B.

Cross-connect line valves NSW-009, NSW-010, NSW-059, and NSW-060 open.

A.

Fire location - A-HPI pump room Same as II. A except B-HPI pump is out of service.

Insulation l

required as in II.A.3.

B.

Fire location - B-HPI pump room Same as II.B except B-HPI pump is out of service. No insulation j

necessary.

C.

Fire location - Make-up pump room Same as II.C. except B-HPI pump is out of service. No insulation necessary.

V.

Abnormal lineup - A-HPI pump aligned to train A, B-HPI pump aligned to train B, Make-up pump out of service. All cross-connect line valves closed.

1 A.

Fire location - A-HPI pump room Same as I.A except Make-up pump is out of service. No insulation necessary.

B.

Fire location - B-HPI pump room Same as I.B except Make-up pump is out of service. No insulation necessary.

C.

Fire location - Make-up pump room Same as II.C except Make-up pump is out of service. No insulation necessary.

ATTACHMENT 2 FIRE HAZARDS FOR A-HPI AND MAKE-UP PUNP ROOMS, AND CALCIUM SILICATE INSULATION ADEQUACY 1.

Oil Quantities and Heat Rates A.

Assumed in " Fire Hazard Analysis Report" 1.

A-HPI pump room - Fire Area #48 011 = 76 gallons Floor Area - 320 SF Fire Loading = 31,540 BTU /SF Duration, less than 30 minutes NFPA Curve E/1600*F maximum temperature 2.

B-HPI pump room - Fire Area #59 011 = 76 gallons Floor Area = 620 SF Fire Loading = 17,000 BTU /SF Duration, less than 15 minutes NFPA Curve E/1400*F maximum temperature 3.

Make-up pump room - Fire Area #58 Oil = 76 gallons Floor Area = 540 SF Fire Loading = 20.150 BTU /SF Duration, less than 30 minutes NFPA Curve E/1500*F maximum temperature B.

Corrected valves - Recent overhaul of the Make-up pump included changing of the oil. The measured quantity of oil in the pump was 20 gallons. The assumed amount in the room will be 20 gal-lons in the pump plus 20 gallons in the room for an oil change.

1.

A-HPI pump room - Fire Area #48 Oil = 40 gallons Floor Area = 320 SF Fire Loading = (31,540) f40 = 16,600 BTU /SF 3

This fire loading is approximately equal to the 17,000 BTU /SF found in the assumed loading for the B-HPI pump room, therefore:

Duration less than 15 minutes NFPA Curve E/1400*F maximum temperature.

2.

!!ake-up pump room - Fire Area #58 011 = 40 gallons Floor Area = 540 SF Fire Loading = (20,150) %d)iyz = 10,605 BTU /SF This does not take the cab'le load into account which is not actually reduced by the 40/76 factor. This cable load will result in a slightly higher loading (approxi-mately 700 BTU /SF) than oil only, but is still lower than the B-HPI room which is enveloping, therefore; Duration, less than 15 minutes NFPA Curve E/1400*F maximum Temperature.

II.

Insulation and Silver Braze Properties A.

Calculation on 1" of thermobestos (

Reference:

Tera Calculation 6/15/77)

Temp.

"K" Valve BTVH/SF/ Inch 100*F 0.38 200'F 0.41 300*F 0.44 400*F 0.48 500*F 0.53 600*F 0.58 1000*F 0.86 1500*F 1.26 Room Temperature 1500*F Temperature Time Inside Conduit (hours) 141.5 0.5 213.0 1.0 356.0 1.5 499.0 2.0 613.4 2.5 713.5 3.0 B.

Calcium Silicate Valves

(

Reference:

Mark's Handbook, page 4-65)

Temp.

"K" Valve BTVH/SF/ Inch 100*F 0.384 300*F 0.456 500*F 0.540

C.

Insulation Testing (

Reference:

Fire Stop Test Report, February 24, 1978)

{

-1" of calcium silicate insulation on conduit.

j' After 50 minutes, the maximum _ temperature was less than 900*F on the conduit internal surface. Oven temperature was in excess of 1600*F.

D.

Maximum Silver Braze Temperature-1.

Maximum allowable for short periods 600*F (

Reference:

Welding Handbook, page 395) 2.

Melting temperature

>1100*F (

Reference:

Mark's Handbook, page 6-92) i I

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