API 6D Annex A
API 6D Annex A defines the requirements for repair or remanufacture of steel ball valve, check valve, gate valve, and plug valves normally used in pipeline applications, originally manufactured in accordance with this specification, which shall be applied when specified by the manufacturer or purchaser.
Annex A
(informative)
Repair or Remanufacture of Valves
A.1 Requirements
This annex defines the requirements for repair or remanufacture of steel ball, check, gate, and plug valves normally used in pipeline applications, originally manufactured in accordance with this specification, which shall be applied when specified by the manufacturer or purchaser.
The requirements of this specification that address design, materials, quality control, welding, NDE, pressure testing, marking and records shall apply.
This annex is not applicable to field repair, with or without the replacement of parts and modification of equipment and is not applicable to repair or remanufacture of used or surplus equipment intended for resale.
Valves exposed to fire shall not be repaired or remanufactured.
The definitions of remanufacturer (see 3.1.40) and repair (see 3.1.41) shall only apply to this annex.
WARNING Valves may contain pressurize fluid and/or residual hazardous fluid, and/or stored energy. Operating the valve can lead to release of product, potentially under pressure.
NOTE Additional requirements may apply by agreement.
A.2 Preparation of Valves for Shipment to the Repairer/Remanufacturer
A.2.1 General
All the activities listed in A.2.2 shall be performed prior to shipment to the repairer/remanufacturer.
The repairer/remanufacturer shall verify activities listed in A.2.2 are completed upon receipt.
A.2.2 Valves Not Requiring Failure Investigation and Analysis
The repairer/remanufacturer shall ensure following activities have been completed:
― Pressure removed from the valve cavities and accompanying actuators, tanks, etc.
― Hazardous materials removed and cleanedfrom the valve and accompanying equipment. Copy ofthe safety data sheet (SDS) to be provided for the valve service media and if applicable for hydraulic fluid. Confirmation of the extent of cleanliness and cleaning to be provided.
― Flanged and weld ends blanked off to protect gasket face, weld ends and valve internals during shipment.
― Block valves to be stroked in order to drain the cavities and left in the full open condition for shipment, unless fail-to-close.
― Seized or non-operational valves are tagged accordingly, and the cavity drained or vented as far as practicable by other means, e.g. body vents.
― If removal of actuator is necessary, its installed orientation documented.
― Fail safe actuators removed in a fail-safe/depressurized condition.
NOTE For valves that are inoperable, seized, or jammed, special procedures may be required for the safe removal of actuator.
― Plug, ball, and reverse-acting through-conduit gate valves shipped in the fully open position, unless fitted with a fail-to-close actuator.
― Check valves shipped with the disc supported or secured during transit
― Valves checked for Naturally Occurring Radioactive Material (NORM) in accordance with the applicable local regulations (region/state/country/ province).
― Lifting equipment on the valve including lifting lugs, brackets, tapped holes for lifting brackets subject to a
visual inspection prior to handling to identify damaged components.
― Valves inspected for preexisting damage.
A.2.3 Valves Requiring Failure Investigation and Analysis
In addition to A.2.2, valves requiring failure investigation and analysis, the repairer/remanufacturer shall ensure following additional activities have been completed:
― Valve is untouched from service in the field, other than removing pressure and draining down.
― Installed location and orientation is to be clearly marked on the valve (e.g., plant/platform side and pipeline side, downstream and upstream, DPE and SPE seats) .
― Care taken to ensure evidence is not tampered with or otherwise negatively impacted while cleaning valve.
― Photos of the valve, required as follows:
― Before removal from the line, and include installation positioning including actuation device, auxiliary piping, and instrumentation.
― As removed (internal and external) before any cleaning.
― As prepared for shipment.
A.3 Receiving Activities
A.3.1 Receiving Activities for Valves Not Requiring Failure Investigation and Analysis
The valve shall be traceable to the owner. Each valve shall be assigned a unique identifier (see A.4.1.2).
A preliminary visual inspection shall be conducted per Table A.1. The owner shall be notified if the valve cannot be remanufactured or repaired
Table A.1―Initial Inspection
| Item | Action to be Completed |
| Initial Inspection | |
| Nameplate(s) and all body marks stamps | − Take note of all markings, and particularly look for any markings that could indicate a remanufactured or repaired valve |
| External condition | − Stains or other signs of leakage from main body or body joints − Paint coating condition − Cracks in paint near or at joints − General staining on body, which would clearly indicate the valve location/orientation − Coating on bolts/nuts. Damage could indicate previous repair − Bolting corrosion − Body fittings for corrosion − Signs of gearbox/ actuator moving on body − Any recent adjustments of gearbox/actuator stops − Look for paint damage |
| Marking | |
| Match mark all components | − Allow for re-assembly in identical orientation − Tag each fitting |
| Valve Operability, If Applicable | |
| Gearbox/lever valves Operate valve | Look for: − Any movement of the flange joints − Any grittiness in operation − Excessive backlash/free movement − Evidence of sand and debris in the valve − Surface of the exposed part of the sealing member as the valve is moved- photograph − Excessive force |
.A.3.2 Receiving Activities for Valves Requiring Failure Investigation and Analysis
In addition to A.3.1, valves requiring failure investigation, the repairer/remanufacturer shall ensure following additional activities have been completed.
― Photograph valve as identified in Table A.2, minimally.
― Confirm if witness inspection or pre-disassembly pressure test is required.
Table A.2―Items for Photograph Inspection
| Items |
| 1. General side views, both sides 2. End view, both ends 3. Bolting especially if bolting shows signs of damage 4. All fittings 5. Any breaks in coating near joints 6. Nameplates and other body markings 7. Any damage or other areas of concern 8. Actuator/gearbox/lever position 9. Stem position with gearbox/actuator removed—Check key is to be in line with bore for open and is to be across the bore for closed |
FOOTNOTE Table A.2 may be used as a template for completing the activities in A.3.2.
A.4 Disassembly and Cleaning of Valves
A.4.1 Disassembly and Cleaning Activities―Failure Investigation/analysis Not Required
A.4.1.1 Disassembly and Cleaning
Valves to be remanufactured/repaired shall be completely disassembled. During disassembly, visual condition of the body, closure, trim components, bolting and other components shall be recorded to establish the scope of remanufacture/repair.
Packing, gaskets, and non-metallic parts shall be removed and disposed of in accordance with the owner’s instructions or appropriate safety procedures.
NOTE 1 Valves may contain packings, sheet gaskets, and spiral wound gaskets that may contain hazardous material which may require special disposal processes.
Valve parts shall be cleaned. Finished surfaces that may be damaged during cleaning shall be protected.
NOTE 2 Valves that may undergo simple repair (e.g., seal replacement) do not need to have paint removed prior to pressure test.
A.4.1.2 Identifier/traceability
The original equipment manufacturer (OEM) nameplate/tags/serial number shall not be removed. Nameplates/tags from previous repair or remanufacture activities shall be removed and retained. A new identifier number shall be applied.
NOTE 1 The Identifier may be a serial number as discussed in Section 12.
NOTE 2 Tags may be electronically scanned, or the information recorded and kept in the repair or remanufacture document files.
Finished surfaces that may be damaged shall be protected. Identification numbers marked on parts shall remain on the parts throughout the remanufacturing or repairing process.
NOTE 3 Smaller parts may be placed in a container labeled with the unique identification number.
Joints and matching parts shall be match marked, stamped, or doweled to ensure valve is re-assembled in identical to removed condition.
Marking/labeling shall be of a type and material that resists damage, fading, or loss, consistent with the expected storage period.
A.4.2 Disassembly and Cleaning Activities―Failure Investigation/analysis Required
In addition to the requirements of A.4.1, valves requiring failure investigation and analysis shall be disassembled and evaluated to capture additional evidence applicable to the investigation.
Elastomeric seals shall be protected from further degradation and stored if needed for investigation.
NOTE Table A.3 may be used as a template for completing the activities in A.4.2.
Table A.3―Template for Disassembly of Ball Valve with Through Leakage
| Item | Action to be Completed |
| Follow OEM’s Sequence of Dismantling | |
| Body fittings | Remove and check for corrosion in ports, bad threads, blocked ports; store |
| WARNING Locked Pressure may Exist under Fitting | |
| Injectors | Remove and check for grease in ports - take sample |
| Gearbox/lever | Remove and check if valve is on open stop |
| Stem | With TDI, check any side to side movement in two directions, with hand pressure on stem; record values |
| Cap screws | Remove and secure adapter plate using torque wrench; record torque (1) |
| Dowels | Remove and check for any clearance |
| Bonnet and body | Match/marked bonnet with body, and stem key orientation is noted/photographed |
| Stem and bonnet | Remove using hotel in stem as lift point; if no hole in stem, secure stem to bonnet before removing bonnet to prevent the stem from falling out of bonnet |
| Stem bore | Check for debris, sand and any foreign material |
| Bonnet seals (before removal) | Check for height of O-ring above carrier/bonnet, effectiveness of anti-extrusion rings |
| Bonnet seals (after removal from bonnet) | Check for extrusion, explosive decompression, damage to anti extrusion rings, nibbling, seal hardness, compression set (flat sides). Photograph in situ and when removed. If extruded, note position of extrusion |
| Stem bore | Measure and check the quality of the bore for body distortion |
| Stem | Repeat check with TDI for side-to-side movement; record movement |
| Remove stem from bonnet | Check for tightness |
Table A.3―Template for Disassembly of Ball Valve with Through Leakage
Continued
| Item | Action to be Completed |
| Inspect all parts | Check for: − Extrusion of seals, damage to bearings, damage to anti extrusion rings, function of anti-static components − Stem surface finish/plating breakdown − Damage to keyways |
| Ball | Replace stem drive on ball; look for any backlash/movement |
| Turn Valve-to-bore Upwards, Upper Seat on Leaking Side of Valve, If Identified | |
| Body bolts | Slacken, measure and record torque |
| Ensure All Removed Components are Matched/marked during Disassembly. The First Removed End Connector and Corresponding Side of the Body to be Matched Marked as Side A | |
| Adapter and seat rings assembly | Remove; studs and nuts may be removed with the adapter |
| Bolts | Remove one at a time, check for straightness and for any bolt bending in a specific quadrant of the valve |
| O-ring seals on adapter with seals still in place. | Check any swelling or seal coming out of the groove (see above - bonnet seals) Photograph |
| Seals | Remove and inspect (see above - bonnet seals) Photograph |
| Measure any gap between the seat retaining screws and seat - both sides. If no screws measure height of seat above adapter 4 places at 90 degrees. | Difference side-to-side and/or springs supporting seat ring not pushing the seat ring hard up onto the securing screws. Can be indicator so seat stuck in seat pocket. |
| Surface of seat | Check for grease |
| Sealing surface of seat | Check for gaps/breaks and scuffs, sand impregnation, splaying For Viton and nitrile seating valves, identify where any gaps are, and refer to location of the vent holes in the seat Identify orientation versus valve position in service: bottom, top break open point, reseat point. |
| Seat area | Photograph |
| Seat ring | Mark for orientation relative to top/bottom trunnion |
| Seat securing screws | Remove |
| Seat ring assembly | Remove with pry bar (or similar) and check for any tightness or jamming |
| O-ring in place | Inspect O-ring (see bonnet seals above). |
| O-ring removed | Inspect O-ring (see bonnet seals above) If extrusion, ensure direction noted. |
| End of bearing plates and dowels | Inspect - corrosion can indicate the bearing plates have not been in hard contact with the adapter. |
| Bearing plates, ball location | Mark with reference |
| Bearing plates and ball | Remove |
| Ball | Mark for side A/B (clockwise to close from above) |
| Ball sealing line in closed. | Check for poor alignment. Establish if under- or over-travel |
| Ball sealing area | Check for damage and scrapes Check to see if tram lines, particularly in the lower valve, are indicative of damage by sand |
| Body | Remove; once removed, match mark all components to the corresponding seat and end connector side. The other (second) side of the valve is marked with Side B. |
A.5 Evaluation of Components
A.5.1 Minimum Requirements for Evaluation and Repair/Remanufacturer of Parts
Components involved in the valve repair/remanufacture shall be inspected and evaluated (visual and dimensional inspection) in accordance with documented procedures (see Table A.4 as a template)
Table A.4―Template for Requirements for Evaluation of Components
| Inspection | Acceptance | Potential Repair when Acceptance Not Satisfied |
| Surfaces, Weld and Screw Threads | ||
| General | No damage or deterioration of parts | Report immediately to purchaser for action. Repair to be agreed. |
| Cracks and linear types of defects including forging laps | Defects may be removed by grinding providing minimum wall thickness and removal limitations are respected. Otherwise item cannot be reused. | Not permitted No repair/remanufacture permitted. |
| Corrosion/erosion visual | Per repairer/remanufacturer or purchaser requirements For B16.34 valves, not less than the dimensions in B16.34 Table 3-A or 3-B. No material loss greater than 2 mm. | Weld repair permitted. |
| Sealing areas | Zero indications, no corrosion pits. Surface finish for O-rings per repairer/remanufacturer or purchaser requirements. (See ISO 3601-2 for guidance). Surface finish for lip seals shall be smoother than 0.2 µm for gas service and 0.4 µm for liquid service. For conventional packing, surface finish in static area shall be 4.5 µm or smoother, Geometry still within extrusion gap limits for seals as specified by seal OEM. | Repair by welding and/or machining. NOTE 1 Corrosion resistant overlay may be used to improve corrosion resistance of carbon and low alloy steels. NOTE 2 Corrosion resistant overlay shall is not be considered as part of the valve wall thickness. |
| Flanged ends | See 5.2.3 B16.5 for finish and thickness, and ASME PCC-1 for tolerance/flatness. | Skim face if thickness of flange and face-to-face dimensions will remain in tolerance. Otherwise perform weld repair and re-machine. |
| Hubbed ends NOTE Some hub designs use special materials in order to meet the pressure temperature ratings. Select weld procedures accordingly | Per repairer/remanufacturer or purchaser requirements OEM data / source | Skim face if thickness of flange and face-to-face dimensions will remain in tolerance. Otherwise perform weld repair and re-machine. |
| Tapped bolt/stud holes Helicoiled threads should be subjected to a pull-out test using a tensioner or similar | No chipped, damaged, pulled threads or sheared off studs. Check with go/no-go gauge. | Re-cut threads, drill, and re-tap any broken studs. NOTE Helicoil may be used subject to agreement by purchaser. |
| Tapped NPT fittings | Go/no-go gauge plus visual inspection. | Drill deeper, with counterbore, or weld repair and re-cut, or machine oversize. |
| Casting linear defects, porosity, surface breaking defects NOTE Through wall defects resulting in leakage require re-heat treatment after weld repair. If the valve distorts during heat treatment it can become unusable. | See Section 7 In accordance with B16.34 or ASME VIII Div. 1. | Excavate and if still within design thickness grind smooth, and surface inspect. If under thickness, weld repair, followed by surface inspection. |
| Forging laps and other defects | See Section 7 In accordance with B16.34 or ASME VIII Div. 1. | Excavate and if still within design thickness, clean up appropriately by grinding and perform surface inspection. If under thickness, approval to leave as-is or repair by welding shall be subject to agreement by purchaser. |
| Other machined areas | Geometry retains the original design intent (if known) | Oversize, and/or weld repair. |
| Dimensional checks for ovality in body bore and stem bore, particularly 3-piece ball valves NOTE Some ovality can be acceptable if a) the valve is behaving elastically, b) the seal extrusion gaps are not compromised. | Check for applicable circularity in both stem bore, and body bore, to within 0.004 in. NOTE Some ovality can be acceptable if a) the valve is behaving elastically, b) the seal extrusion gaps are not compromised. | Report results of ovality to purchaser. No further work unless otherwise agreed. |
| Straightness | ||
| General | Check for operational restrictions. A general guideline is 0.001 in. per inch of length or 0.001 mm per mm of length. | Replace. |
| Surface finish in sealing area | Per repairer/remanufacturer or purchaser requirements. Dynamic area is 0.8 µm, | For valves with adjustable packing diameter may be reduced by up to 0.010 in (0.25 mm). For non- adjustable packing, stem shall be replaced |
| Check for twist-quarter turn | Check keyway for signs of deformation. | Replace stem and keys |
Table A.4―Template for Requirements for Evaluation of Components
Continued
| Thread profile-rising stem | Free but snug running of drive nut. Thread profile gauge. | Clean up thread or replace |
| Tee nut on gate valve, stem drive on ball valve | Good fit without wear and slack. | Replace worn part |
| Tee nut connection to stem. | If pinned connection, check condition. | Replace pin and/or oversize |
| Keyway | Run a key in groove without toppling, excessive clearance, no side burrs, and no out-of-straightness on the keyway. | Replace stem and keys |
| Thrust bearing area | Check surface finish for burrs or wear. | Remove a maximum of 0.010 in (0.25 mm) by machining |
| Stem diameter in sealing area | Clearances and profile in conformance compliance with seal OEM data. | Replace |
| Plating/coatings | No flaking, scratches, or other damage. | Grind off plating and re-apply, ensuring dimensions within original values. |
| Wear Surfaces | ||
| General | Surface inspection and checks for disbondment. | Replace. |
| Scratches, Scores or Other Damage to Sealing Surfaces | ||
| General | Surface visual inspection | Re-grind ball. Nominal reduction permitted is 0.001 in. per inch (0.001 mm per mm) of ball spherical diameter, with a maximum of 0.040 in. (1 mm). Otherwise weld repair or replace. |
| Plating damage | Surface visual inspection | Remove plating by grinding or dipping. Ball no smaller than 0.010 in. (0.25 mm) after grinding. Replace plating. |
| Trunnion damage | Surface visual inspection | Weld repair or replace. No under-sizing permitted. |
| Tungsten carbide coating | Surface visual inspection, plus dpi PT. No indications in sealing area. | Remove coating T/C by grinding or dipping. Ball dimensions may be reduced by 0.001 in per inch (0.001 mm per mm) of ball spherical diameter with a maximum of 0.04 in (1 mm) Re-coat. No reduction in thickness permitted on parallel type gate valves. |
| Hard weld deposit/facing | Surface visual inspection plus PT | Repair method to be agreed between repairer/remanufacturer and purchaser. |
| Inserts and Seat Ring | ||
| Soft insert | Surface inspection for impregnation of solids, digs, scuffs. | Skimming of insert and seat ring to maintain original profile. Remove no more than 0.005 in shall be removed. Otherwise new seats or, depending on design/material, reinsertion. |
| Tungsten carbide coating | Surface visual inspection, plus PT. No indications in sealing area. | Remove coating T/C by grinding or dipping. Re- establish original geometry. |
| Hard weld deposit/facing | Surface visual inspection plus PT. | Repair method to be agreed. |
| General inspection | No splits, stretch, swelling, nipping, nibbling, extrusion, bubbles, discoloration, compression set. (See ISO 3601-3 for guidance on geometry). | Replace. |
| General inspection. | All studs to be removed from tapped holes and inspected. | Bolts/studs damaged or not able to be removed without damage to be replaced |
| Straightness. | Any bending determined by either rolling on flat table or with straightedge. | Replace |
| Thread profile | Check by running nut down full length, plus no burrs, thread pulls or rounding, necking | Replace |
| Under head cracking. | Inspect under head of bolts and cap screws by PT/MT. No indications permitted | Replace |
| Thread tolerance | Per repairer/remanufacturer or purchaser requirements. See 5.2. ASME B1.1. Class 1A. after being chased out by lathe/machining | Replace |
| Marking | Check bolts have manufacturers and/or material grade stamped on ends and/or head. ASTM A962 | If no marking, replace bolts |
| Grade/marking | Per repairer/remanufacturer or purchaser requirements. Check for 12.9 or higher strength | Replace if necessary. Shall not be reused |
Table A.4―Template for Requirements for Evaluation of Components
Continued
| Head. | Any damage to the external hex, 12-point head or internal hex which could compromise the safe and reliable application of load | Replace |
| Drains and Plugs | ||
| Drain cocks/ threaded plugs | Removed and checked for functionality, sealing, damage, threads with go/no gauges. | Replace. |
| Sealant injection ports/fittings | Removed and checked for functionality, sealing, damage, threads with go/no gauges. In addition, pressure tested to the hydrotest pressure of the valve body prior to re-assembly. | Replace. |
FOOTNOTE
Table A.4 may be used as a template for completing the activities in A.5.
A.5.2 Bodies, Bonnets, End Connectors, End pieces, Tailpieces and Covers
Body, bonnet, end connectors, end pieces, tailpieces, and covers shall be visually inspected.
NOTE NDE may be employed to investigate the extent of visual defects.
Defects such as cracks, wear, cuts, scoring or excessive metal loss shall be brought to the attention of the owner for disposition instructions.
All tapped holes shall be visually inspected for missing or incomplete threads, defective thread profile, torn or ruptured surfaces and cracks. Defects shall be removed/repaired.
End connector dimensions shall conform to the applicable specification per design requirements of Section 5. Face-to-face and end-to-end dimensions shall conform to Section 5 or to dimensions specified by the owner.
Stem seal preparations or stuffing boxes shall be examined for the proper condition and finish consistent with the seal design. Surface corrosion shall be removed by polishing, machining, or other suitable means. Dimensions and finishes of the repairer/remanufacturer surface shall be inspected and documented.
A.5.3 Stems
Stem sealing surfaces shall be smooth and free of defects that can affect the ability to seal or functionality of the part. The parts shall be free of burrs or other mechanical damage that can affect the strength, function, or fitness of the part for its intended use. The dimension of the sealing area shall be inspected and documented.
Stems with threads shall be inspected for missing or incomplete threads, defective thread profile, torn or ruptured surfaces and cracks.
NOTE The surface texture of threaded parts may be evaluated without magnification.
Rising stems shall be inspected for straightness, finish, and cylindricity.
Stem heads or other connectors shall engage properly with the mating component.
A.5.4 Pressure Controlling Parts (Gate, Ball, Plug, Disc, Seats, Clappers, etc.)
Pressure controlling parts shall be visually inspected for corrosion, wear, pitting, erosive wear, or other defects.
A.5.5 Bearings
Bearings shall be free of damage, excessive corrosion, or wear. Coatings or liners shall not be torn, damaged or excessively worn. Operation shall be smooth. If these requirements cannot be satisfied, then bearings shall be replaced.
A.5.6 Stem Nut (Gate and Rising Stem Ball Valves)
Visually inspect stem nut and stem housing for corrosion, galling or wear on the bearing surfaces. Internal and external threads shall be visually inspected for condition and proper engagement with the external stem threads.
A.5.7 Body-to-Bonnet/Closure/End piece/Tailpiece/Cover Bolting
Unless specified otherwise by the owner, all pressure boundary bolting shall be replaced. Replacement bolting shall minimally conform to API 20E BSL1.
A.5.8 Other Components
Other components shall be visually inspected and items which need to be replaced or remanufactured shall be processed in accordance with the repairer/remanufacturer procedures.
A.6 Repair/Remanufacture/Replacement of Valve Parts
A.6.1 Control of Manufacturing Operations
Repair and remanufacture operations shall be performed in accordance with documented procedures.
A.6.2 Replacement Parts and Material
A.6.2.1 Source
Materials used for replacement parts shall conform to Section 6.
The source of replacement parts shall be either OEM replacement parts or non-OEM and/or reverse engineered parts which meet the requirements of A.6.2.2.
A.6.2.2 Non-OEM Component Materials
For non-OEM components, and/or reversed engineered parts shall meet the requirements of Table A.5.
The material shall be identified, and critical dimensions verified to be the same as the original component.
A.6.3 Welding
Welding, including repair welding procedures and welder/welding operators’ qualifications shall conform to 7.4.
Procedures for non-pressure containing or non-load bearing welds shall be qualified per the repairer/remanufacturer’s requirements.
When post weld heat treatment is required, it shall conform to Section 7.
Table A.5―Requirements for Replacement Parts of Non-OEM/reverse Engineered Parts
| Replacement | Minimum Design | Material Requirements | Inspection and Test |
| Yes a,b | Pressure and load calculations as required. | Full traceability and part of data package. PMI for all materials except carbon and low allow steel. | DPI or MPI of machined surfaces. Installed and operational as part of the body hydrotest. |
| Stem | |||
| Yes a,b | Full stress analysis for the maximum actuator/gearbox torque or force. | Full traceability and part of data package. PMI for all materials except carbon and low allow steel. | DPI or MPI of machined surfaces. Installed and operational as part of the body hydrotest. |
| Seat Inserts in Original Seat Rings | |||
| Yes a,c | Evidence that the repair company has knowledge, equipment, and experience to re-insert seat seals. | Material certificates and/or Certificates of Conformance (C of C) for insert materials. | Part of seat test. Valve shall be subjected to break out test, to demonstrate stability of the seat ring. |
| New Metallic Seat Rings with New Inserts | |||
| Yes a,c | Same as for seat inserts in original seat rings, and demonstration that seat ring is manufactured from material with equivalent performance to the original. In additions demonstration that surface finish, squeeze, fill and extrusion gap requirements of seal manufacturer met. | Material certificates and/or Certificates of Conformance (C of C) for insert materials. | Part of seat test. Valve shall be subjected to break out test, to demonstrate stability of the seat ring. In addition, and where relevant, ensure cavity relief functions adequately. |
| Bearings | |||
| Yes a | Calculations to demonstrate the Pressure, velocity and pressure x velocity criteria are not exceeded for the bearing. | Calculations included and Certificates of Conformance (C of C) for bearings. PMI of backing material if in special alloys or specifically requested. | Function test at break out and/or at pressure. |
| Valve Closure Member (i.e., Ball, Gate, Plug as Appropriate) | |||
| Yes a,b | Demonstration that the obturator design is equivalent to the OEM. | Material certificates. Traceability. | Valve seat and performance test. |
| Springs (Inside the Valve) | |||
| Yes a | Demonstration the stiffness and free length are within 10% of the OEM values. | Material certificates or Certificates of Conformance. NACE MR0175 compliance if required. | Valve performance testing. |
| Elastomers | |||
| Yes a,c | Calculations for squeeze, fill and extrusion. | Certificates of Conformance. | Valve performance testing. |
| Polymeric Seals and Lip Seals | |||
| Yes a,c | None. | Certificates of Conformance. | Surface finish checks of housings. |
| Pressure Boundary Bolts (Like-for-like Replacement) | |||
| Yes | None. | Material certification. | Valve pressure test. |
| Pressure Boundary Bolts, Change of Material | |||
| Yes a | Pressure containment calculations to verify design adequacy. | Material certification. | Valve test pressure. |
| Ancillary Fittings including Injectors | |||
| Yes | None. | Material certification including pressure test. | Pressure test. |
FOOTNOTES
a When agreed
b Alternative materials to original manufacture may be used. c Any change to original material shall be by agreement and shall take consideration of fire-test status.
A.6.4 Nondestructive Examination (NDE)
Where applicable, NDE shall be performed and evaluated by ASNT SNT-TC- 1A or ISO 9712 Level II qualified technicians. Procedures for the NDE evaluation method/acceptance shall conform to Annex I, where applicable.
A.6.5 Valve End Connector Modifications
RF flange valves may be converted to RTJ or RTJ flanges may be converted to RF when requested by the owner and shall be limited by the requirements of Section 5.
NOTE Modifications are typically accomplished by weld deposits and subsequent machining.
A.7 Reassembly
Reassembly of remanufacturer/repairer valves shall conform to 9.6.
When specified by the owner, no lubricant shall be used on valves during assembly. If minimal lubricant is required, the remanufacturer/repairer shall supply details to the owner for evaluation.
Repainting or recoating shall conform to the manufacturer’s written procedures, unless otherwise agreed.
A.8 Final Acceptance―Pressure Testing
Repaired/remanufactured valves shall be pressure tested in accordance with the requirements of Section 10.
A.9 Equipment Marking
Repaired/remanufactured valves shall have a new nameplate in accordance with the requirements of 12.3.
NOTE As noted in A.4.1.2, original nameplate remains.
Information on the nameplate shall conform to Table A.6.
Table A.6 —Nameplate Marking Requirements
| Marking | Format | |
| Remanufacturer or Repairer name | ABC Valve Repair Company | |
| 6DRM or 6DR | 6DRM (for remanufacture) or 6DR (for repair) | |
| Unique identifier number | R/RM-XXXXXXXXXXXXXX-XX | |
| Date of Remanufacturer/ Repair | DOMRM/R MM-YY or DOMM/R MM-YYYY | |
| Pressure class | 150/300/400/600/900/1500/2500 | |
| Face-to-face/end-to-end dimensions | 26.00 in. (660 mm) | |
| Trim identification: material grade symbols indicating metallic materials for: | 17-4 316SS LF2 FKM | |
| - stem - sealing - closure | faces members | |
| - non-metallic seal materials | ||
| Nominal valve size a) full-opening valves: nominal valve size b) reduced-opening valves: |
8 NPS (200DN) 8X6 NPS (200X150 DN) or 8R (186) | |
If an end connector is modified from RTJ to RF (see A.6.5) the R-value, when visible, shall be removed.
In addition to the nameplate, the unique identifier number shall be marked on the body.
A.10 Preparation for Shipment and Short-term Storage
Repaired/remanufactured valves shall be prepared for shipment and short-term storage shall conform to the requirements of Section 13.
A.11 Documentation
In addition to, the requirements of Section 14, the following shall be retained for remanufactured/repaired valves:
― As received-inspection results, see Table A.1
― Applicable photographic evidence, see Table A.2
― Applicable nameplates/tags from the previous repairer/remanufacturer that have been removed (see A.4.1.2)
― New identifier number, see A.4.1.2
