Post on 29-May-2018
transcript
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Update on the API
Work Group Activitieson Pipe Markings
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API Pipe GradesAPI Pipe GradesGrade B, X42, X52, X60, X65, X70, X80
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API Pipe GradesAPI Pipe GradesGrade B, X42, X52, X60, X65, X70, X80
And TwoAnd TwoProduct Specification LevelsProduct Specification Levels
PSL 1 and PSL 2
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API Grade X60, PSL 2
Yield Strength Range 60.2 81.9 ksi
60 62 64 66 68 70 72 74 76 78 80 82 84 86 88 90 92 94
API Grade X65, PSL 2Yield Strength Range 65.3 87 ksi
Yield Strength in ksi
API Grade X70, PSL 2
Yield Strength Range 70.3 92.1 ksi
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Historically, it has been a commonHistorically, it has been a common
practice to apply dualpractice to apply dual--gradegrade
markings at the lower end of themarkings at the lower end of the
grade spectrumgrade spectrum
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The most common dual gradeThe most common dual grade
product has always beenproduct has always beenGrade B/X42Grade B/X42
Other common dual-grade items are:
-X42/X46
-B/X42/X46
-X42/X52
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- Pipe manufactured as Grade X60 (415) or
higher shall not be substituted for pipe ordered
as Grade X52 (360), or a lower grade, without
the purchaser's approval.
API Specification 5L Provides Only Minimal
Guidelines regarding dual markings for Line Pipe:
- API Spec 5L, Annex N specifically allows
marking pipe with comparable specifications.
This allows pipe to have API markings as well
as CSA or ISO designations
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In the last few years, pipe mills haveIn the last few years, pipe mills have
seen an increased number ofseen an increased number of
requests for application of dualrequests for application of dual--gradegrademarkings in upper grades.markings in upper grades.
-- X60 / X65X60 / X65
--X65 / X70X65 / X70-- X60 / X65 / X70X60 / X65 / X70
--X70 / X80X70 / X80
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API Grade X60, PSL 1
Yield Strength Minimum 60.2 (no maximum for PSL 1)
60 62 64 66 68 70 72 74 76 78 80 82 84 86 88 90 92 94
API Grade X65, PSL 1
Yield Strength Minimum 65.3 (no maximum for PSL 1)
Yield Strength in ksi
API Grade X70, PSL 2
Yield Strength Range 70.3 92.1 ksi
API Grade X80, PSL 2
Yield Strength Range 80.5 102.3 ksi
96 98 100 102 104
API Grade X52, PSL 1
Yield Strength Minimum 52.6 (no maximum for PSL 1)
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X52 PSL 1, X60 PSL1, X65 PSL 1,X52 PSL 1, X60 PSL1, X65 PSL 1,
X70 PSL 2, X80 PSL 2X70 PSL 2, X80 PSL 2
There have been reports of pipe beingstenciled and certified as follows:
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API Grade X60, PSL 2
Yield Strength Range 60.2 81.9 ksi
60 62 64 66 68 70 72 74 76 78 80 82 84 86 88 90 92 94
API Grade X65, PSL 2Yield Strength Range 65.3 87 ksi
API Grade X70, PSL 2
Yield Strength Range 70.3 92.1 ksi
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Welding Procedures shall be qualified within theWelding Procedures shall be qualified within the
following grade ranges:following grade ranges:
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One pipeline operator reported that they were laying a line
of X65 PSL 2 pipe. They were using X65 / X70 dual grade
pipe in the line. They were audited by the pipeline
regulatory agency (PHMSA) and all of their welding
documentation referenced qualification of API Grade X65,
PSL 2. Since the pipe was X65 / X70 and each grade isrequired to be qualified separately, the auditor would not
accept the X65 documentation.
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Proposal Issued for Vote to the API Membership for
requirements to be added to API Spec 5L:
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Marking of Pipe to Multiple Grades:
Marking of pipe to multiple grades is permitted only by agreement between the
purchaser and the manufacturer within the following guidelines:
- Pipe may have multiple markings within the following grade ranges:
< X42
X46, X52, X56 (including intermediate grades)
For X60 & above, marking of multiple grades is prohibited
- The manufacturer is responsible to assure that the pipe conforms to
all requirements of each of the certified grades. This allows pipe to beused as any of the grades individually.
- Pipe shall be marked to only one PSL level.
- Where pipe is marked to multiple grades, a single certification
document shall be issued referencing the grade combination as
marked on the pipe. The certification document may contain a specificstatement that pipe conforms to each grade individually.
- Pipe shall only be re-graded and re-marked under the
manufacturers control. Certificates for re-graded pipe may only be
issued by the pipe manufacturer.
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The results of the ballot were surprising. Overall, the votes
were for acceptance of the new requirement. However, asexpected, there were a number of negative votes.
The biggest objection was that the current proposal
restricts dual-grading of X42 / X52, which has been acommon industry practice.
API requires that negative ballots must be resolved
before the item can go forward.
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The work on this item is currently on-going.
A new edition of API Specification 5L will probably be
issued early 2011. It is the intent of the work group to have
this item finalized and ready for publication in the next
edition of the Specification.
Before that can happen, all negative votes have to be
resolved and the exact wording of the requirement will
need to be finalized.
The final version will be reviewed by members of the API
1104 group as well as the API Quality group to assure
compliance with those requirements.
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Marking of Pipe to Multiple Grades:
Marking of pipe to multiple grades is permitted only by agreement between the
purchaser and the manufacturer within the following guidelines:
- Pipe may have multiple markings within the following grade ranges:
< X42
X46, X52, X56 (including intermediate grades)
For X60 & above, marking of multiple grades is prohibited
- The manufacturer is responsible to assure that the pipe conforms to
all requirements of each of the certified grades. This allows pipe to beused as any of the grades individually.
- Pipe shall be marked to only one PSL level.
- Where pipe is marked to multiple grades, a single certification
document shall be issued referencing the grade combination as
marked on the pipe. The certification document may contain a specificstatement that pipe conforms to each grade individually.
- Pipe shall only be re-graded and re-marked under the
manufacturers control. Certificates for re-graded pipe may only be
issued by the pipe manufacturer.