7/31/2019 SPC-0804.02-92.08 Rev D2 Positive Material Inden http://slidepdf.com/reader/full/spc-080402-9208-rev-d2-positive-material-inden 1/15 PREPARED BY NA PTT PUBLIC COMPANY LIMITED CHECKED BY ONSHORE COMPRESSOR STATION 4 PROJECT APPROVED BY 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.D2TOTAL 15 PAGES AREA CODE OF SITE LOCATION GENERAL AREA: 010 . PTT PLC. CONTRACT NO. PTT PLC. PROJECT NO. 0804.02
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7/31/2019 SPC-0804.02-92.08 Rev D2 Positive Material Inden
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).
7/31/2019 SPC-0804.02-92.08 Rev D2 Positive Material Inden
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
7/31/2019 SPC-0804.02-92.08 Rev D2 Positive Material Inden
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.
7/31/2019 SPC-0804.02-92.08 Rev D2 Positive Material Inden
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.
7/31/2019 SPC-0804.02-92.08 Rev D2 Positive Material Inden