ML17251A900

Enclosure 2, Attachment E to 17-296, WEKO-SEAL - Recommended Installation Procedures for Water and Waste-Water Piping, Miller Pipeline, Revised 03/05/17

ML17251A900
Person / Time
Site:	Surry
Issue date:	06/05/2017
From:	Miller Pipeline
To:	Office of Nuclear Reactor Regulation
Shared Package
ML17251A864	List: ML17251A895 ML17251A897 ML17251A898 ML17251A900
References
17-296
Download: ML17251A900 (9)

Text

NON-PROPRIETARY Serial No.17-296 Docket Nos. 50-280/281 RAI Response - CFRP Alternative Request Enclosure 2 Attachment E WEKO-SEAL- RECOMMENDED INSTALLATION PROCEDURES FOR WATER AND WASTE-WATER PIPING, MILLER PIPELINE, REVISED 06/05/17 VIRGINIA ELECTRIC AND POWER COMPANY (DOMINION ENERGY VIRGINIA)

SURRY POWER STATION UNITS 1 AND 2

Revised 06/05/ 17

.a MILLER

~PIPELINE AN MVEAGE COMPANY WEKO-SEAL RECOMMENDED INSTALLATION PROCEDURES FOR WATER AND WASTE-WATER PIPING WEKO-SEALMATERIAL COMPONENTS 1 Internal Joint Seal (WEKO-SEAL) 2 Retaining Bands 3 Retaining Band Shims 4 Retaining Band Wedge Assortment 5 Retaining Band clips 6 Pipe Lubricant 7 Hydraulic Expander 8 Air Test Assembly Page 11

Revised 06/05/17

1.0 OBJECTNE

WEKO-SEALS are manufactured from a non-toxic (EPDM) rubber compound, which are designed to internally and economically stop joint leakage or infiltration. These seals are flexible internal rubber leak clamps that ensure a noncorrodible, bottle tight seal around the full inside circumference of the pipe joint area. The following procedures are recommended to ensure proper installation of the WEKO-SEALS.

2.0 PREREQUISITES

2.1 These procedures will be performed during pipeline shutdown and/or flow bypass. If required, pipeline to be removed from service and an adequate safety-tagging boundary established and verified.

2.2 All pipelines have been de-watered and are at atmospheric pressure.

2.3 Pipeline access has been provided and established.

2.4 Confined Space Entry Permit has been processed which covers the scope of work to be performed inside the pipe.

2.5 All permits have been processed which cover the scope of work to be performed.

2.6 Continuous forced air ventilation has been established and is sufficient to maintain the confined space for safe entry.

2.7 The owner before use has approved all consumables (i.e. hydraulic oil, lubricants, thread sealers, markers etc.), and MSDS sheets are on the job site.

NOTE: The above prerequisites do not have to be performed in the sequence listed.

3.1 If any unanticipated or unexpected alarm, noise, vibration, odor, or excessive leakage is observed, immediately exit the pipe until the condition is identified and resolved.

3.2 All safety requirements as stated on the Confined Space Entry Permit shall be observed.

4.0 PROCEDURE

4.1 VERIFY that all WEKO-SEALS have been packaged in a proper manner that has not caused deformation or harm. This care must be maintained until the seal(s) are delivered to the designated job site location.

4.2 EXAMINATION of the seals shall be performed by a qualified installation technician, paying particular attention to the ribbed (lip seal) section of the seal.

If the quality of material construction or condition is in doubt, the seals shall not be used.

4.3 PERFORM an inspection of the pipe interior. Review all seal installation locations to determine the cleaning requirements and note any anomalies that Page 12

Revised 06/05/17 may need to be addressed with owner.

4.4 REMOVE dirt, scale, and other debris from the pipe walls in areas where the seals are to be installed. Cleaning shall be performed at least 3" beyond either side of proposed seal position. REMOVE all dirt and debris from the joint gaps, leaving a clean area for "JOINT FILLING." These cleaning operations shall be accomplished by hand brushing and scraping, pneumatic wire brush, pneumatic grinder, and/or oil free air jet.

4.5 FILL joints to the full depth of the gap with a quick-setting cement mortar and render flush with the surrounding joint surface. All surplus material spillage shall be removed from the joint area. Surface preparation, mixing, placement, and curing of the quick-setting cement mortar shall be performed in accordance with the manufacturer's placement guidelines.

NOTE It is acceptable to use a 16 gage stainless steel backing band to cover the joint area if infiltration is too great for a mortar to be placed.

4.6 ALL high/low surface imperfections running axially through or part way through the sealing surface must be removed before installation of the seals. Any joint gaps, low areas, or deep imperfections must be properly filled with approved non-toxic joint filler and rendered smooth to suite the prepared surface of the joint area. When the pipe is concrete or reinforced concrete, it may be necessary to apply a thin layer of quick-setting cement mortar to the preparation area where the seal will .be placed. This cement will control pipe porosity and irregularities to provide an effective leak test on the completed seal.

4.7 VERIFY that the sealing surface surrounding the joint area and the area where the "lip seals" are to be seated is free of debris and smooth. It CAN NOT be overemphasized the importance of good surface preparation.

4.8 MARK the locations of the lip seals on the pipe ID to clearly define the seal installation position.

4.9 LUBRICATE prepared seal area with "Ease-On Pipe Lubricant." The lubricant shall be hand applied (using a brush or hand applied with nitrile rubber gloves) over the prepared area. Care must be taken not to acquire debris from the surrounding unprepared surfaces into the lubricant and thereby reintroducing debris to the prepared surface. The lubricant functions as an aid in fitting the seal and is not credited with pressure retention. "Ease-On Pipe Lubricant" is a brand name typically used by Miller Pipeline; however, other approved lubricant of equivalent composition is acceptable.

4.10 POSITION the WEKO-SEAL parallel to the joint gap with the pressure test valve located at approximately 3 o'clock or 9 o'clock position. The seal must be positioned accurately on the joint areas guided by the marks established in step 4.8.

NOTE when positioning a wider seal that requires more than two bands, the seal may need to be offset more to one side of the joint than the other to accommodate middle retaining bands.

Page I 3

Revised 06/05/17 4.11 INSTALL a metal radius shim underneath the wedge area in the seal grooves for each retaining band before placement of the stainless steel bands on the seal.

These shims enable radial loads to be transmitted evenly to the seal as the bands are expanded.

4.12 INSTALL the upstream and downstream stainless steel retaining bands into position by placing in designated seal grooves. Since retaining bands can be of one-piece, two-piece, or three-piece construction depending on pipe diameter, a retainer clip is to be used to restrain band movement during expansion. In certain design applications, a special mechanical locking device shall be used to temporarily lock the bands before expansion. (See attached reference drawing details) 4.13 INSTALL middle-retaining band(s) if required per design, between the upstream and downstream bands. Verify that the middle retaining band(s) are not placed directly on the joint. If placed on the joint, then reference 4.10.1. Install the middle-retaining band(s) in accordance with steps 4.11 through 4.17.

4.13.1 The middle-retaining band(s) can be installed at 500psi less than the minimum expansion pressure for the upstream/downstream bands. The sole purpose of the middle band is to keep the ballooning on the seal to a minimum from external pressures. This allows air to flow underneath the middle band when you get to step 4.19 and the testing of the seal.

NOTE that the seals do not have a designated positioning groove for the middle-retaining band. Install the middle-retaining band upstream of the test port.

4.14 POSITION the hydraulic expander device in line with the retaining bands while ensuring that the retaining bands remain in position and do not become moved or dislodged. Care must be taken to ensure that the expander is positioned correctly on the bands.

4.15 EXPAND the stainless steel retaining bands using the hydraulic expander, holding pressure for at least two minutes. Expansion pressure range should be known before performing this operation and is available via expansion pressure chart for the designated seal size. Extreme caution should be taken to ensure that recommended expansion pressures are not exceeded, resulting in pipe and/or seal damage.

4.16 INSTALL a radius-locking piece (wedge) in the exposed gap between the expanded band ends. The wedge size shall be selected to provide interference fit.

Tap the wedge into position, locking in the compression of the seal. RELEASE the pressure from the hydraulic expander after wedge is secure.

4.17 PERFORM a second expansion for each of the retaining bands a minimum of 30 minutes after the first expansion using the same pressure range as the first expansion. This allows for any seal relaxation that may occur. If required, replace wedge piece with a larger size to provide interference fit.

4.18 TORQUE the mechanical locking device to 15 inch-pounds, if required per seal Page 4 J

Revised 06/05/ 17 design as noted in step 4.12.

4.19 PERFORM a pressure test on the seal sections after a minimum of 30 minutes has elapsed after final fitting of the seal to be tested. A restraining device called a "test band" is to be utilized when needed for standard and extra-wide seal sizes to prevent excessive ballooning.

4.19.1 Pressurize seal to 10 psig (See Note 1) through the seal test valve. Apply an approved soap and water solution to the seal edges and center bladder section. Inspect for leakage.

4.19.2 If the pressure test indicates leakage, determine cause and repeat step 4.7 and higher. THE ROOT CAUSE FOR MOST LEAKAGE IS INADEQUATE SURFACE PREPARATION.

4.20 DEPRESSURIZE seal and isolate test port. SEAL the "test valve" with a countersunk hex head completion screw using an approved thread sealing compound. Remove all installation hardware, and pressure gauges.

4.21 When it is necessary to cover a wider area on the pipe than can be provided by standard, extra-wide, or double-wide seals, it is common and permissible to use a "sleeve" with a WEKO-SEAL at each end or overlapping of seals typically using extra-wide seals. This scenario wi ll require prior design considerations by Miller Pipeline and the Engineering Firm/Owner.

Note 1: Testing to 10 psi is normal for seals ranging in size up to 84". For seal diameters of84" through 96", testing should be reduced to 7 psi due to safety concerns resulting from the increase in area and resulting force. Testing of seals above 96" diameter should not exceed 4-5 psi.

EXPANSION PRESSURE GUIDELINE The expansion pressures offered represent guideline expansion pressures only. Factors such as pipe condition, pipe type, pipeline age, and any other extenuating circumstances that may exist must be considered. Miller Pipeline shall not be responsible for damages resulting from use of this pressure chart.

16 2000 3000 Medium Head Exp11nder Debi 1500 16

...... (pl6g)

Large Head Expander Data

• --1 16 Mega Head Exp11nder Debi

.._ ttehPre-...

18 2200 3200 1700 18 18 20 4000 6000 3500 20 2000 3000 1500 20 0.125 24 2A 4400 6400 3900 2200 3200 1700 24 0.125 30 6000 8000 5600 3000 3300 4000 4300 2500 2llOO 30 36 0.125 0.188 42 42 3500 4500 3000 42 0.188 48 4000 6000 3500 48 0.188 54 54 4000 6000 3600 54 0.188 60 66 "'n 66 5000 5000 7000 7000 4500 4500 60 66 0.188 0.250 72 5000 7000 4500 72 0.250 78 78 5000 7000 4500 78 0.250 84 90 108 120 84 108 120 5000 5000 7000 7000 7000 7000 7000 0000 0000 0000 4500 4500 8600 8600 8600 90 108 120 2600 '200 2100 0.250 0.250 0.250 0.250 132 132 7000 10000 8600 132 2875 4300 2375 0.375 138 138 7000 10000 8600 138 3000 4350 2500 0.375 144 144 7000 10000 8600 144 3125 4350 2625 0.375 148 148 7000 10000 8600 148 3200 4350 2700 0.375 156 156 7000 10000 8600 156 3375 4350 21175 0.375 178 178 178 3850 5800 3350 0.5 210 210 2 10 4550 5800 4050 0.5 216 216 216 4700 5800 4200 0.5 Page [ 5

Revised 06/05/17 Retaining Bands RETAJNING BAND CUP END DETAIL - RETAINING BAND SLEEVE CLIP OVERLAP RETAINER RETAINING BAND RETAINING BAND END WITH RETAINING TAPPED HOLES BAND SCREW, 8.H.S.

5/16" - 18 UNC X 1/2" LG.

(2 REQUIRED)

SLOTTED END DETAIL - RETAINING BAND MECHANICAL LOCK OVERLAP SCREW LOCK Page 16

_ _,j

NON-PROPRIETARY Serial No.17-296 Docket Nos. 50-280/281 RAI Response - CFRP Alternative Request Enclosure 2 Attachment F The information contained in this attachment is requested to be withheld in its entirety because:

~ It reveals the distinguishing aspects of a process (or component, structure, tool, method, etc.) whose use by any of the submitter's competitors, without a license from the submitter, would constitute a competitive economic disadvantage to the submitter.

~ Use by a competitor of the information requested to be withheld would reduce the competitor's expenditure of resources, or improve its competitive position, in the design, manufacture, shipment, installation, assurance of quality, or licensing of a similar product.

~ The information requested to be withheld reveals commercial strategies of the submitter or customers or suppliers.

~ It reveals aspects of privately funded development plans or programs of commercial value to the submitter or owner of the information.

TYPICAL CROSS SECTION OF THE REPAIRED PIPE INCLUDING CONCRETE ENCASEMENT VIRGINIA ELECTRIC AND POWER COMPANY (DOMINION ENERGY VIRGINIA)

SURRY POWER STATION UNITS 1 AND 2

NON-PROPRIETARY Serial No.17-296 Docket Nos. 50-280/281 RAI Response - CFRP Alternative Request Enclosure 2, Attachment F