EPC HARWEEL CLUSTER PHASE 2 FACILITIES
(PDO Contract No. C31-0615)
ENGINEERING SPECIFICATION
FOR
POSITIVE MATERIAL IDENTIFICATION (PMI)
PEC JOB NO: JI
-
182ENGINEERING SPECIFICATION FOR POSITIVE MATERIAL IDENTIFICATION
PETROFAC INTERNATIONAL LTD. PETROLEUM DEVELOPMENT OMAN ENGINEERING SPECIFICATION FOR PMI HARWEEL CLUSTER PHASE 2 FACILITIES PETROFAC JOB NO. : JI-182 PDO CONTRACT NO. C31-0615
2. PURPOSE OF PMI
The purpose of PMI is to ensure that the nominal composition of the material specified has been correctly supplied and installed.
I.
SCOPE
3.
REFERENCES
RevA
EEMUA 149 Code of Practice for the Identification and
Checking of materials of construction in pressure systems i n process plants
DEP 31.38.01.31 -Gen Shop and Field Fabrication of Piping
HWL-0-0003-406-1 D-4-0 Engineering Specification for Marking and Color Coding of Piping Materials
ASTM A 751 Standard Test Methods, Practices and Terminology for
Chemical Analysis of Steel Products.
ASTM E 1473 Test Methods for Chemical Analysis of Nickel, Cobalt
and High Temperature Alloys
Rev A
I
SPE 771302 Materials, Examination and Certification Requirements for Valves i n General ServicesThis document specifies the basic requirements for conducting positive material identification (PMI) tests on alloy steel materials in the shop. PMI i s intended to be conducted on all 55316, SS 31 61, 6% Mo, Alloy 825 and Alloy 625 components in piping systems.
4. DEFINITIONS
RevA
I
Alloy Steel Material : All 55316, SS 316L, 6%Mo, Alloy 825 and Alloy 625 material in any form (Plates, pipes, forgings, castings, welds, clad pipe, lined pipe, welding electrodes etc.)
This document covers the extent of parts to be checked, requirements, approved testing methods, acceptancelrejection criteria, and marking requirements for PMI.
Positive Material ldentification (PMI) : The method to determine the nominal composition of a mechanical component.
PEC : Petrofac
Vendor : Mills, Material Manufacturer, Material Component and Finished Product Supplier, Mill Stockist etc.
5. EXTENT OF VERIFICAl'ION
5.1. PMI shall be performed by the material manufacturer, fabricator, supplier (for example, mill stockist), or authorized third-party representative. It i s the responsibility of the vendor to ensure that the implementation and conduct of the PMI program i s performed in accordance with this document.
5.2. The test methods outlined in this document are intended to identify the nominal composition of alloy materials. These test methods are not intended to establish the conformance of a material to a particular alloy specification.
5.4. PMI of weld material shall be performed i n the same manner as for the adjacent base metal.
5.5.
PMI shall not be considered as a substitute for required mill test reports listing chemicalcomposition. Mill test reports shall not be considered as confirming alloy verification.
Rev A
5.6. All Alloy materials i n all services shall undergo 100% PMI. The extent of PMI for valve components
shall be in accordance with the relevant MESC specification. All Alloy welds including weld overlay for Cladding shall be subjected to 100% PMI. Following elements shall be examined for PMI
5.3. PMI shall be performed at the point in time that ensures that proper materials have been used in
the fabrication of an identifiable assembly (such as valves). This i s typically at the supplier's shop during fabrication or assembly. PMI shall start at the original supplier premises (mills, forginglcasting shops, stockists etc.). All the wel.ding consumables used in the manufacture/fabrication of a component shall also be subjected to PMI.
Rev A
6. ALLOY VERIFICATION
6.1. When PMI i s performed by the supplier or a third-party agency, the fabricator or supplier shall
certify that all PMI tests have been performed by qualified personnel in accordance with the approved procedure. The fabricator or supplier shall also certify that all PMI has been performed at the point in time that will ensure the correct material has been used.
Rev*
I
A certificate of verification shall be included in the Manufacturers Record Book (MRB) as part offinal documentation.
6.2. The vendor shall ensure that all involved parties fully understand the PMI requirements which
include the verification method to be used, the period during fabrication when verification will be conducted, and the method of marking verified material.
6.3. A PMI procedure shall be issued to PEC for approval. This procedure shall, as a minimum include
the following
w Name and Manufacturer of the equipment to be used. w Description of PMI equipment operating principle. w Calibration procedure and frequency.
w Timing of the Test (after manufacturing, before fabrication/assembly for shop fabricated items, after fabrication).
w Detail procedural steps including any surface preparation requirements.
@ Procedure to be followed in case the material does not conform to the intended chemical composition.
w Radiation safety operation and emergency procedures (as applicable) w Statement of personnel competency or qualification.
PETROFAC INTERNATIONAL LTD. PETROLEUM DEVELOPMENT OMAN ENGINEERING SPECIFICATION FOR PMI HARWEEL CLUSTER PHASE 2 FACILITIES PETROFAC JOB NO. : JI-182 PDO CONTRACT NO. C31-0615
6.4. The PMI procedure shall be subject t o review by PEC as follows.
The vendor 1 contractor shall submit the alloy verification procedures to PEC for review, including complete descriptions of the methods and equipment t o be used and personnel qualification procedures.
PEC will review the procedures and qualifications and witness sample alloy verification tests to the extent necessary to confirm that the procedures, equipment, and personnel are capable of providing consistent and accurate results.
PEC will check procedures to ensure that positively identified materials are traceable to the purchase order and/or any required material documentation or mill test reports.
PEC shall have the right to witness the performance of any PMI test.
If the performance of any verification activity i s unacceptable to PEC, or i f any material has been incorrectly identified, all further tests shall be subject to approval by PEC until such time as the problem i s corrected.
6.5. Shop-fabricated piping commodities requiring PMI shall have the verification testing done in the
vendor's shop. Alloy verification of weld overlays (Cladding) shall be conducted on similar basis as that of the solid alloy component.
7.
VERIFICATION METHODS
7.1. The instruments or methods used for the examination shall be suitable for identifying the material by quantitative measurement of the major alloying elements required i n the applicable material specification or welding procedure specification. The preferred method is X-ray emission analysis with a calibrated portable instrument. The material manufacturer, supplier, or fabricator performing the verification shall submit procedures for PEC approval. Any X-Ray emission analyser, such as Texas Nuclear analyser Model 9266 or equivalent with computerised read-out is acceptable.
7.2. Spark emission spectrography or other methods that leave burn marks on the component shall not be used. Instruments utilized for conducting PMI shall be subject to review and approval by PEC. 7.3. The selection of the test methods shall ensure that PMI testing as required by this specification
w i l l not cause damage to the component being examined, which would cause it to fail prematurely in service. The following information regarding the test equipment must be supplied for approval.
Make and Model Range of each element
Accuracy of the Instrument expressed as ( +/- )% for each element Calibration method and certificate
Certificate of Analysis for all calibration standards.
8.
ACCEPTANCE CRITERIA
8.1. Materials shall contain the amount of alloying elements specified i n applicable ASTM specification. Welding electrodes and wires shall be within the amount of each alloying element specified in ASME Section IIC. Alloys, including castings, shall be acceptable i f the alloying elements are each within the minimum and maximum values permitted by the material specification.
9.
REJECTION CRITERIA
If the PMI test results fall outside the acceptable range using the methods described in Section 7, the concerned items shall be rejected. The supplier shall be responsible for segregating rejected items and assuring that they are properly identified to prevent their unauthorized reuse or removal.