SC6 Ballot 1974: Adopt-back of ISO 10423:2009

SC6 Ballot 1974: Adopt-back of ISO
10423:2009 as API 6A 20th ed.
Task Group Report on Resolution of
Ballot Comments
Eric Wehner 30 June 2010
• Issue 1: Normative references, latest edition
• Comment: It can be impossible for manufacturers to
comply with a revision to a normative reference unless
some time period for implementation is allowed.
• Proposed change: Replace the last sentence of Clause
2 with: "For undated references, the latest edition of
the referenced document (including any amendments)
applies." with: "For undated references, the latest
edition of the referenced document (including any
amendments) applies, except that new editions may be
used on issue and shall become mandatory 6 months
from the date of the revision."
• TG Resolution: Comments accepted:
– Revise Clause 2 as proposed.
– NOTE: This is in 6A 19th edition, Annex O.
• Issue 2: ASTM A703 reference
• Comment (a): Normative reference ASTM
A703/A703M-08a is a dated reference; should be
an undated reference.
• Comment (b): Casting coupons referenced in
5.6.2c) do not match.
• TG Resolution: Comments accepted:
– Delete "Figure 1" in 5.6.2 c).
– Revise 5.6.2c) to read: "-casting: size not
required to exceed size specified in ASTM
– Change ASTM A703/A703M to undated
reference in Clause 2.
• Issue 3: Nuts for insulated flanges
• Comment: Both the stud and nut used on
insulated flanges should meet exposed bolting
• Proposed change: Require Grade 2HM nuts.
• TG Resolution: Comment rejected:
– TG group believes that allowing Grade 2H nuts
for exposed bolting is intentional and has been
shown to be acceptable .
– TG recommends that the topic of bolt and nut
materials for sour service and/or for insulated
flanges should be addressed as a NWI.
• Issue 4: Use of Grade L7M nuts
• Comment: ASTM A194 requires impact-tested
nuts when low-temp fasteners, ASTM A320, are
specified. However, API 6A requires use of lowtemp bolting excluding nuts at temperature class
L (-50C).
• Proposed change: Add 4L, 7L and 7ML grade nuts
to Table 62 .
• TG Resolution: Comment accepted in part:
– TG agrees that ASTM A194/A194M grade 7M
should be added to and Table 62 as
an additional acceptable grade for nuts for all
classes, both exposed and non-exposed.
• Issue 5: Flange design criteria
• Comment: The design method used by API
for flanges is not specified or referenced.
• Proposed change: Add reference to API
design criteria and methods in
• TG Resolution: Comment rejected, however:
– TG proposes to add the following to
"NOTE: Information on design analysis and
load capacities of flanges specified in this
International Standard can be found in API
Technical Reports 6AF, 6AF1, and 6AF2."
• Issue 6: Design acceptance criteria
• Comment: ASME allowable stress at test
pressure should be 0,9 SY, not 0,83 SY (5/6).
• Proposed change: Replace ST = 0,83 Sy with
ST = 0,9 SY , to match API 16A.
• TG Resolution: Comment rejected:
– No consensus reached in TG for revision
– TG recommends consideration of a NWI to
develop a standard for design verification
(methods and criteria) for drilling and
production equipment (SC6, SC16, SC17).
• Issue 7: Bolt design criteria
• Comment: A limit is needed on membrane
plus bending stress in studs.
• Proposed change: Revise 4.3.4 to allow bolt
stress at test pressure = 0,9 SY, and add SB as
the maximum membrane plus bending stress
in the bolting.
• TG Resolution: Comment rejected, however:
– Revise second sentence to read: "Bolting
tensile stress, based on the minimum crosssectional area of the bolting, shall not
exceed the limit given in Equation (9):"
• Issue 8: Castings for PSL 3/3G
• Comments (3 voters): There is no technical justification
and or product performance data to support the
prohibition of castings for PSL 3.
• Proposed change: Reinstate the following subclauses
from Annex O of 6A 19th edition: b), c), b) 1), c) 1), c) 2).
• TG Resolution: Comments accepted:
– Revise referenced subclauses to permit castings for
PSL 3/3G bodies, bonnets, end & outlet
– Retain “wrought material only” for PSL 4 BBEC and
for PSL 3-4 mandrel tubing and casing hangers.
• Issue 9: Pressure-controlling parts
• Comment: No general quality requirements are
provided for pressure controlling parts other than valve
bore sealing mechanisms, choke trim and hangers.
• Proposed change: Revise 7.4.10 and Table 37 to apply
to casing and tubing hanger mandrels and other
pressure controlling parts
• TG Resolution: Comment noted:
– TG suggests that the definitions and requirements
for pressure-controlling and pressure-containing
parts should be reviewed in detail and possible
revisions proposed, as a NWI. Note: This could
include Clauses 4, 5, 6, 7, and 10.
• Issue 10: Table reference error
• Comment: Wrong table is referenced in
• Proposed change: Replace “Tables 48 and
B.48” with "Tables 61 and B.61."
• TG Resolution: Comment accepted:
Correct the table reference in as
• Issue 11: SSV/USV designation
• Comment: Incorrect designation of SSV/USV
valves is used in A.9.
• Proposed change: Change “Performance test
agency (PR2 SSV/USV Valves)” to
“Performance test agency (Class II SSV/USV
• TG Resolution: Comment accepted:
Correct A.9 as proposed.
• Issue 12: New temperature ratings
• Comment: Minimum temperature of 0 °F imposes
unnecessary requirements for tropical climates
where ambient temperatures may not fall below
60 °F.
• Proposed change: Add to Table G.1: XR as Room
Temp to 350 °F and YR as Room Temp to 650 °F
• TG Resolution: Comment rejected, however:
– of 10423:2009 includes new provision
for "minimum and maximum temperatures as
agreed between the purchaser and
manufacturer." Marking requirements in 8.1.1
have been similarly modified.
• Issue 13: Use of HP VR plugs for < 15,000 psi
• Comment: Annex L should be informative, or
6A should allow the use of HP VR plugs in 2-ksi
thru 10-ksi equipment.
• Proposed change: Revise 8.10, 10.22, and
Annex L to permit HP VR plugs in all pressure
• TG Resolution: Comment noted:
– No consensus reached in TG for revision.
Task group recommends NWI in SC6 to
establish VR/HP VR standards, with
revisions as deemed appropriate.
• Issue 14: Spec 6AV requirements
• Comment: Incomplete carryover of 6AV1
requirements into 6A.
• Proposed change:
– Change I.1.4 to read: "The successful completion
of the test shall qualify all sizes and all pressure
ratings of that manufacturer's SSV/USV of the
same basic design and materials of construction
for the intended class of service."
– Also, remove NOTE following I.1.4.
• TG Resolution: Comment accepted:
Revise I.1.4 as proposed.
• Issue 15: Annex J Scope
• Comment: The phrases "user/purchaser owned...
equipment" and "for continued service by the
user/purchaser" and "not applicable to... equipment
intended for resale" are commercial restrictions, not
technical requirements.
• Proposed change:
– Revise to read: "Annex J defines the requirements for
repair and remanufacture of wellhead and christmas
tree equipment originally manufactured in accordance
with this International Standard. Field repair, with or
without the replacement of parts and modification of
equipment is outside the scope of this annex."
– NOTE: This is the wording used in Annex B of API Spec
16A, Specification for Drill-Through Equipment.
• TG Resolution: Comment rejected:
No consensus reached in TG for revision.
• Issue 16: VR and HP VR thread gauging
• Comment: For VR plugs and preps L.6 says these
“may” be inspected, not required.
• Comment: For L.6.2 there is no requirement to gauge
the HP VR preparation, only the plug.
• TG Resolution: Comments accepted in part:
– Add at the beginning of L.6.1; "VR plugs and plug
preparations shall be dimensionally inspected."
– Revise L.6.2 to read: "HP VR plugs and plug
preparations shall be dimensionally inspected.
Inspection methods shall be in accordance with the
manufacturer's documented procedures.“
– Note that applies to VR and HP VR plugs,
and requires all threads or retention profiles to be

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