spc-0804.02-92.08 rev d2 positive material inden
TRANSCRIPT
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PREPAREDBY
NAPTT PUBLIC COMPANY LIMITED
CHECKED
BY ONSHORE COMPRESSOR STATION 4
PROJECT
APPROVEDBY
CERTIFIED
(PTT)NA
REV.
NO.
DATE REVISED
BY
APPROVED
BY
DESCRIPTION
D1 18-Feb-08 NA ISSUED FOR ITB
D2 11-Jun-08 NA ISSUED FOR ITB
SPECIFICATION FOR
POSITIVE MATERIAL IDENTIFICATION REQUIREMENTS
SPC-0804.02-92.08 REV.D2
TOTAL 15 PAGES
AREA CODE OF SITE LOCATION
GENERAL AREA: 010
.
PTT PLC. CONTRACT NO. PTT PLC. PROJECT NO.
0804.02
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POSITIVE MATERIAL
IDENTIFICATION
REQUIREMENTS
PTT PUBLIC COMPANY LIMITED
ENGINEERING SPECIFICATION
SPC-0804.02-92.08
PAGE: 2 OF 15
REV: D2
CONTENTS
SECTION
1.0 SCOPE................................................................................................. 3
2.0 REFERENCED STANDARDS ................................................................. 3
3.0 DEFINITIONS ....................................................................................... 3
4.0 PMI EXAMINATION ............................................................................. 4
ATTACHMENT A: PMI REPORT FORM - ALLOY BULK MATERIALS...............12
ATTACHMENT B: PMI REPORT FORM - SITE MADE WELDMENTS..................14
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POSITIVE MATERIAL
IDENTIFICATION
REQUIREMENTS
PTT PUBLIC COMPANY LIMITED
ENGINEERING SPECIFICATION
SPC-0804.02-92.08
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1.0 SCOPE
1.1 This Standard defines the minimum Positive Material Identification (PMI)requirements to be performed at the module construction yards and the
construction site on alloy, pressure retaining piping materials and welds. It shall
apply to both PMI on receipt of materials at the module yard, central marshalling
facility or construction site, as appropriate, and PMI on final installed piping
materials and welds.
1.2 PMI shall be performed on all pressure retaining components, including piping
items, valves, welds, bolting and gaskets, up to, and including the first
instrument block valve. The following items shall not be subject to PMI
unless specifically defined:
(i) Valve gates, stem and trim, internal bellows seals;
(ii) Gaskets other than solid metal or metallic jacketed types (eg. spiral
wound gaskets);
(iii) Carbon steel items
1.3 The CONTRACTOR to ensure that PMI, as defined in this Standard, has been
performed on receipt of the alloy bulk materials, and on all final installed piping
materials and welds, and verify that all material is as specified on the relevant
piping isometrics and bill-of-materials.
1.4 The CONTRACTOR shall provide the right of the inspector to audit,
examinations, and perform, or have performed by others, random PMI
examinations as required
2.0 REFERENCED STANDARDS
ASTM American Society for Testing & Materials
3.0 DEFINITIONS
Inspector: PTT’s appointed inspector.
CONTRACTOR: Any party in contract with PTT for the purpose of
carry out works or services.
Alloy: All non-carbon steel, including but not limited to, Cr-Mo
steels, austenitic, ferritic, martensitic and duplex stainless
steels, nickel and copper alloys, titanium.
Bulk Material: Material purchased in bulk where individual items are not
allocated a unique tag number (eg. random pipe lengths,
tubes, valves, fittings, flanges, bolting, non-process
strainers)
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POSITIVE MATERIAL
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PTT PUBLIC COMPANY LIMITED
ENGINEERING SPECIFICATION
SPC-0804.02-92.08
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REV: D2
Lot: All units from a common heat of material presented
for inspection against a single purchase order item. In
the case of valves, or similar items, wherebodies/bonnets/covers may be from different heats,
the Lot shall consist of all units with the same
combination of heat numbers for pressure containing
components.
Sample: One, or more, units selected at random from the Lot
which are to be examined to determine acceptability
of the Lot.
4.0 PMI EXAMINATION
4.1 General
4.1.1 PMI examination of alloy materials and welds is independent of any certification,
markings or colour coding that may exist and is aimed at verifying that, where
alloy materials are specified in project specification, only the correctly specified
alloy grades are installed.
4.1.2 CONTRACTOR shall identify all alloy materials and maintain full traceability of all
alloy materials.
4.1.3 CONTRACTOR shall ensure that all alloy materials are segregated and stored in
separately identified locations to prevent the mixing of different alloy
specifications or alloy material with carbon steel.
4.2 Methods of PMI Examination
4.2.1 The method used for PMI shall provide a qualitative determination of the critical
alloy elements in accordance with Table 3, without interpretation by the PMI
operator.
4.2.2 The following methods/instruments are acceptable:
(i) Instruments shall have a suitable X-Ray tube or Isotope source, with alloy
verification, Quantitative element analysis, with permanent record
capabilities. The Alloy Analyser used shall be detailed in Vendor’s PMI
procedure, with the technical information providing sufficient
comprehensive data to establish acceptance within project
requirements.
(ii) Wet chemical analysis or other laboratory methods.
4.2.3 All PMI instruments shall have been serviced within a 6 month period of thetime of use to verify the suitability of batteries, sources etc. The date of the last
service shall be stated on the pro-forma PMI Report Forms (Attachments A & B).
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POSITIVE MATERIAL
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PTT PUBLIC COMPANY LIMITED
ENGINEERING SPECIFICATION
SPC-0804.02-92.08
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REV: D2
4.2.4 All PMI instruments shall be calibrated, in accordance with the instrument
manufacturer's recommendation, at the start of each working shift as a
minimum.
4.2.5 Certified samples, with full traceability, of "known" alloy materials shall be
available for use as a random spot check on the instrument calibration. These
samples are in addition to any standard manufacturer's calibration sample.
4.2.6 Surfaces to be examined shall be prepared by light grinding or abrasive paper
and solvent cleaning. Evidence of 'arc burn' resulting from the examination shall
be removed by light grinding or abrasive paper.
4.2.7 It is advised, but not mandatory, that PMI activities be sub-contracted to an
independent PMI sub-contractor, to ensure that experienced, qualified PMIoperators are employed. In all cases, whether PMI activities are sub-contracted
or performed in-house, only qualified operators shall perform PMI and records
showing qualification and experience of PMI operators shall be available.
4.3 Location, Timing and Extent of PMI Examination
4.3.1 On receipt, materials which have been subject to a previous 100% PMI
examination and for which there is supporting PMI marking and certification,
shall, in principle, be accepted for receiving inspection without further PMI
checks. Spot PMI checks may be performed on materials subject to a previous
sample PMI examination to ensure that material control procedures are operatingcorrectly.
4.3.2 For materials which have not been subject to a previous PMI examination, or for
which there is no, or insufficient, PMI marking and certification, PMI shall be
performed on all such materials on receipt to the extent stated in Table 1 prior
to receiving inspection.
4.3.3 All installed alloy bulk materials and welds shall be subject to PMI examination
in the final 'as-installed' condition, but prior to insulation or painting, to the
extent stated in Table 2.
4.3.4 Where a particular constituent of the alloy composition cannot be determined by
the PMI instrument employed (eg. carbon content in austenitic stainless steels,
minor alloying elements in grades of titanium), the instrument shall be used to
verify the major alloy constituents of the material and traceable material test
certificates used to verify the remainder.
4.4 Identification of Acceptable Materials
4.4.1 The CONTRACTOR shall establish the identification marking for acceptable
materials.
4.4.2 For materials subject to receipt PMI examination in accordance with para. 4.3.2
and Table 1, acceptable materials shall be marked by means of a low-stress
(dot, vibratory or 'U' type) hard stamp or indelible, non-deleterious ink or paint
(ie. free of low melting point metals such as zinc, lead, copper etc.), at or
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POSITIVE MATERIAL
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PTT PUBLIC COMPANY LIMITED
ENGINEERING SPECIFICATION
SPC-0804.02-92.08
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adjacent to each PMI sample point on each component or weld. For 'sensitive'
materials such as thin-walled pipe etc., identification shall be by indelible,
non-deleterious ink or paint.
4.4.3 For installed materials and welds subject to PMI examination in accordance with
para. 4.3.3 and Table 2, acceptable materials shall be marked by means of a
low stress (dot, vibratory or 'U' type) hard stamp or indelible, non-deleterious
ink or paint (ie. free of low melting point metals such as zinc, lead, copper etc.),
at or adjacent to each PMI sample point on each component or weld.
4.5 Rejected Materials
4.5.1 Rejected material found on receipt PMI examination shall be segregated in a
separate, designated area, to prevent re-use. A more accurate analysis may beperformed to verify the composition of the rejected material or, alternatively, the
material shall be replaced. Rejected material found during erection PMI
examination shall be removed and replaced.
4.5.2 Rejected weld metal shall be removed by suitable means and the excavation
subject to a PMI check prior to repair. Alternatively, the weld shall be
completely removed, the weld preparation re-made and surface non-
destructively examined, and re-welded. All repair welds shall be subject to PMI
per Table 2, Section 2.
4.6 Recording and Documentation
4.6.1 PMI results for materials subject to receipt PMI examination, whether acceptable
or rejected, shall be reported on a PMI Report Form (Attachment A).
4.6.2 PMI results for as-installed piping materials and welds, whether acceptable or
rejected, shall be reported on a PMI Report Form (Attachment B). The
CONTRACTOR may use his own form providing it includes all the following
data:
- Contractor's Name
- PMI Sub-contractor's name and address, if applicable- Sub-contract number
- Isometric number
- Location and date of PMI examination
- Description of method/instrument used
- Instrument no. and date of last service
- Results of PMI examination
- Type of alloy examined per isometric
- Conclusion
4.6.2 The PMI report for as-installed PMI examination shall be included in the final
piping isometric records.
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POSITIVE MATERIAL
IDENTIFICATION
REQUIREMENTS
PTT PUBLIC COMPANY LIMITED
ENGINEERING SPECIFICATION
SPC-0804.02-92.08
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TABLE 1: EXTENT OF PMI - MATERIALS RECEIVED WITH NO PMI MARKINGS
1. Piping Bulk Materials
Random length seamless and ERW pipe: Each component part
Random length fusion welded pipe (ERW pipe excluded): Each component base material part(1). Refer to Section 2 below for tests
on welds
Forged fittings (eg. flanges, branch fittings, weldolets, blinds,plugs, etc.):
Each component part
Seamless and ERW pipe fittings: Each component part
Fusion welded pipe fittings: Each component base material part(1). Refer to Section 2 below for
tests on welds
Valves, including body, bonnet, plugs, vents, drains etc.: Each pressure retaining
component part. Refer toSection 2 below for tests on
welds & Section 3 for tests on
bolting.
Permanent strainers, traps, including blind flanges, plugs
etc.:
Each pressure retaining
component part. Refer to Section
2 for tests on welds and Section
3 for tests on bolting
2. Pressure Retaining Welds
Circumferential welds, including valve body-to-flange and
valve body-to-bonnet welds; Longitudinal welds:
Each weld, with 1 test per weld
seam for automatic and semi-
automatic welding processes,
and 1 test per weld seam and 1
test per 450mm weld length
thereafter for manual welding
processes(2)
Repair welds:
1 test on excavated weld toensure incorrect material fully
removed; thereafter 1 test per
450mm repair weld length
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POSITIVE MATERIAL
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PTT PUBLIC COMPANY LIMITED
ENGINEERING SPECIFICATION
SPC-0804.02-92.08
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3. Bolting
Valve bonnet bolting for flange rating Classes <900 Sample basis per Table 4
Valve bonnet bolting for flange rating Classes ≥900: Each bolt and nut
External pressure retaining bolting for flange rating Classes
<900
Sample basis per Table 4
External pressure retaining bolting for flange rating Classes
≥900
Each nut and bolt
4. Gaskets
Solid metal or jacketed metallic gaskets for flange rating
Classes ≥900
Each gasket
Alloy rings associated with ring-type joints (RTJs) Each ring
Gaskets other than above PMI not required unless
specifically stated
Notes:
(1) PMI on these components may be undertaken in conjunction with PMI of the deposited weld
metal per Note (2).
(2) For all welds, PMI shall be performed on the completed weld capping pass (both internal and
external, where access permits) and the base material on either side.
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POSITIVE MATERIAL
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PTT PUBLIC COMPANY LIMITED
ENGINEERING SPECIFICATION
SPC-0804.02-92.08
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TABLE 2: EXTENT OF PMI - INSTALLED MATERIALS AND WELDS
1. Piping Bulk Materials
Piping, flanges, branch fittings etc. welded into line: Each component base material
part, undertaken in conjunction
with PMI of weld per Section 2.
Flanged or screwed valves, fittings (eg.
plugs),strainers,filters etc. installed into line:
Each component base material
part. Only body shall be tested
on valves
2. Pressure Retaining Welds
Circumferential welds: Each weld, with 1 test per weld
seam for automatic and semi-
automatic welding processes,
and 1 test per weld seam and 1
test per 450mm weld length
thereafter for manual welding
processes (1)
Attachment welds: Each weld per component part(1)
Note:
(1) For all welds, PMI shall be performed on completed weld capping pass and the base material on
either side. Where carbon steel base material is welded to an alloy base material with an alloy
weld metal, the carbon steel base material is exempt from PMI. Where carbon steel base
material is welded to an alloy base material with a carbon steel weld metal, the carbon steel base
material and the carbon steel weld metal are exempt from PMI.
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TABLE 3: ELEMENTS TO BE DETERMINED DURING PMI
MATERIALS (1) ELEMENTS TO BE DETERMINED
1 Cr - 0.5 Mo
1.25 Cr - 0.5 Mo
2.25 Cr - 1 Mo
5 Cr - 0.5 Mo
9 Cr - 1 Mo
Cr, Mo, V
Cr, Mo, V
Cr, Mo, V
Cr, Mo, V
Cr, Mo, V
12 Cr (Type 410S/405)
12 Cr
17 Cr
304 (L)
310
309 (L)
309 Nb
316 (L)
321
347
Inconel 182/82
Inconel 625
Inconel 600
Incoloy 800
Incoloy 825
Cr
Cr
Cr
Cr, Ni, Mo, Nb(Cb), Ti
Cr, Ni, Mo, Nb(Cb), Ti
Cr, Ni, Mo, Nb(Cb), Ti
Cr, Ni, Mo, Nb(Cb), Ti
Cr, Ni, Mo, Nb(Cb), Ti
Cr, Ni, Ti, Nb(Cb)
Cr, Ni, Nb(Cb), Ti
Ni, Cr
Ni, Cr, Mo, Nb(Cb) + Ta
Ni, Cr
Cr, Ni, Al, Ti, Cu
Cr, Ni, Mo, Ti
Admiralty Brass
Aluminium Brass
Cupro-nickel (70-30)
Cupro-nickel (90-10)
Monel 400
Titanium
Cu, Sn, As
Cu, Al, Zn
Cu, Ni
Cu, Ni
Cu, Ni
Ti
NOTE: (1) List of materials is not exhaustive, and shall not be construed as limiting the alloy
materials subject to PMI
Remark: When it want to verify in minor element e.g. low carbon in stainless steel type 304Lor 410S. CONTRACTOR shall specify identification methods and propose to
PTT/CONSULTANT for approval.
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TABLE 4: REQUIREMENTS FOR SAMPLE PMI
Number of Units in a Lot Representative Sample
1 -5 100% of all units
6 - 200 5 units or 5%, whichever is greater
≥200 10 units or 3%, whichever is greater
Notes:
(1) If all units of the representative Sample are acceptable, the inspection Lot shall be acceptable.
(2) If any unit from the representative Sample is found to be unacceptable, the remainder of the that
Lot shall be examined 100%. If the remainder of the Lot is found acceptable, the sampling
technique in Table 4 shall be resumed. The unacceptable unit(s) shall be replaced and the
replacements examined 100%.
(3) If a Lot is found unacceptable, the next two Lots, of the same material product and from the same
source, shall be examined 100%. If both Lots are acceptable, the sampling technique in Table 4
shall be resumed.
(4) If any of the Lots examined in (3) above is found unacceptable, the remaining material product from
the same source shall be examined 100%. Any unacceptable unit(s) shall be replaced and the
replacements examined 100%.
(5) When the material markings are incomplete, preventing positive correlation between the material
requisition, purchase order and a material test certificate, the materials shall be rejected.
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SPC-0804.02-92.08
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ATTACHMENT A: PMI REPORT FORM - ALLOY BULK MATERIALS
POSITIVE MATERIAL IDENTIFICATION (PMI) - Alloy Bulk Materials
PMI Report #________ Page______of________
Contract No: Supplier:
Order No: Supplier's Ref No:
Requisition No: Sub-Supplier/Manufacturer:
Sub-Suppler/Manufacturer Ref No:
1. Description of Items
Item Type (as per requisition):Material Colour Code:
Material Specification/Grade:
2. PMI Results
Requisition
Item No.
Number of
Items in Lot
Number of
Items Tested
Material test
Certificate No.
Cast/Heat
No.
Accept/
Reject
Date
Examination Location: PMI Inspector:-
Examination Date: Company:
Instrument Type/ID Number: Signature:
Date of Last Service: Date:
(include certificate) Stamp:
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ATTACHMENT A: PMI REPORT FORM - ALLOY BULK MATERIALS (cont.)
POSITIVE MATERIAL IDENTIFICATION (PMI) - Alloy Bulk Materials
PMI Report #________ Page______of________
Requisition
Item No.
Number of
Items in Lot
Number of
Items Tested
Material test
Certificate No.
Cast/Heat
No.
Accept/
Reject
Date
Examination Location: PMI Inspector:
Examination Date: Company:
Instrument Type/ID Number: Signature:
Date of Last Service: Date:
(include certificate) Stamp:
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ATTACHMENT B: PMI REPORT FORM - SITE MADE WELDMENTS
POSITIVE MATERIAL IDENTIFICATION (PMI) - Site Made Weldments
PMI Report #________ Page______of________
Contract No: Contractor:
Isometric No.: PMI Sub-contractor:
Area: Instrument Type/ID No.:
Material Type: Date of Last service:
(include certificate)
Weld No./Bulk
Fitting No.
Weld metal
PMI Result
Base Matl. #1
PMI Result
Base Matl. #2
PMI Result
Insp.
InitialsAccept/Reject Date
Examination Location: PMI Inspector:
Examination Date: Company:
Instrument Type/ID Number: Signature:
Date of Last Service: Date:
(include certificate) Stamp:
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ATTACHMENT B: PMI REPORT FORM - SITE MADE WELDMENTS (cont.)
POSITIVE MATERIAL IDENTIFICATION (PMI) - Site Made Weldments
PMI Report #________ Page______of________
Weld No./Bulk
Fitting No.Weld metal
PMI Result
Base Matl. #1
PMI Result
Base Matl. #2
PMI Result
Insp.
InitialsAccept/Reject Date
Examination Location: PMI Inspector:
Examination Date: Company:
Instrument Type/ID Number: Signature:
Date of Last Service: Date:
(include certificate) Stamp: