Hi Vino,
Please see the guidelines of MR-0175 below.The acceptance of ASTM-A-395 Cast Iron is subject to clients acceptance. Some organizations' specification may outrightly reject this material(see the attached hyperlink). It may be good idea to seek the clients justification and go for the alternative.
If the application is not for sour service , then there should not be any issue for rejection of this material. However an answer from the client would definitely be of help.
Thanks.
Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist
A.2.4 Requirements for the use of cast irons
A.2.4.1 General:- Grey, austenitic and white cast irons shall not be used for pressure-containing members. These materials may be used for internal components if their use is permitted by the equipment standard and has been approved by the equipment user. Ferritic ductile iron in accordance with ASTM A395 is acceptable for equipment unless otherwise specified by the equipment standard.
A.2.4.3 Compressors and pumps Grey cast iron:- (ASTM A278, Class 35 or 40) and ductile (nodular) cast iron (ASTM A-395 ) are acceptable ascompressor cylinders, liners, pistons and valves.
5.9.5. Cast irons and ferritic ductile (nodular) irons e.g. ASTM A 395 are unacceptable for pressure-retaining parts and for impellers etc. The use of these materials for non-pressure, low-stressed components shall be subject to approval by TLM. Austenitic irons are also generally unacceptable for pressure-retaining parts.
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On Sat, 16 Jun 2012 15:15:39 +0530 wrote
>Dear Experts,
One of our leading Client has rejected the Centrifugal Water Pump on the basis that Cast Iron is not acceptable in Oil and Gas industry.
The Cast Iron has been used for Casing and Impeller, Material: ASTM A395 Gr 60-40-18.
The Design Code for Pump is ASME(Form A2).
Purpose: This pump is a used for cooling the oil for the Cylinders of a Gas Compressor.
Moreover. the requirement that Cast Iron is not acceptable is not specified in Client Standard/Specification.
I request all experts in this subject to through more light and let me know if you require any further inputs.
Appreciate to see quick response.
Thanks & Regards
Vino - Doha
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