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[MW:7027] MW: 7016- SS 316L Pump casing Nuts/Bolts Material

By Materials & Welding

Hi Nilesh,

 

What’s the intended application of these pumps, for upstream (oil and gas production,) or for downstream (oil refining application)?

 

 It’s my opinion that MR 0175 will apply for the first environment and MR -0103 will apply in the second environment.

 

MR-0103 Bolting materials are as below:-

 

 

ASTM A453 Gr.660-UNS S66286 is accepted by MR-0175- Part-3(CRA and other alloys) subject to the following condition(Table- A-26). This bolting material is of very high tensile strength (precipitation hardening stainless steel). See the scope from ASTM standard for this material:-

 

This specification (A-453) covers four grades of bolting materials with nine classes of yield strength ranging from 50 to 120 ksi [345 to 827 MPa] for use in high temperature service such as fasteners for pressure vessel and valve flanges. The material requires special processing and is not intended for general purpose applications. The term “bolting material,” as used in this specification, covers rolled, forged, or hot-extruded bars; bolts, nuts, screws, washers, studs, and stud bolts. Headed bolts and rolled threads may be supplied.

 

 

I’ve attached an intersting  article on MR-0175, read Page -5 on ASTM A453 Gr.660-UNS S66286 material.

 

Hope this would  help you.

 

Thanks.

 

Pradip Goswami,

Welding & Metallurgical Engineer/Specialist

Email-pgoswami@sympatico.ca,

pgoswami@quickclic.net

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Darji Nilesh (Mumbai - Machinery)
Sent: Wednesday, September 15, 2010 12:41 AM
To: materials-welding@googlegroups.com
Subject: [MW:7016] SS 316L Pump casing Nuts/Bolts Material

 

Dear Members,

 

I have come across a problem related to selection of Material for Pump casing Nuts/Bolts due to the following TWO diff. cases.

 

We have few Pumps in SOUR Service + Non Sour Service (With NACE MR 0175 requirements applicable in Both the cases) in SS 316L Material. These Pumps are Axial split. Pump Casing material is A 351 CF3M.

 

·         One Vendor has selected Pump casing Nuts/Bolts as per API 610 Table H.2 (Bolts : A 193 Gr B7M & A 194 Gr 2HM) : (In this case SOUR Service is not applicable , But NACE MR 0175 is applicable)

·         Second vendor selected Bolts Material A193 Gr B8M but, now they want to replace with ASTM A453 Gr.660, in accordance to what specified in NACE MR0175. (In this case SOUR Service  + NACE MR 0175 is also applicable)

 

Expert please share your opinion.

 

Regards,

 

Nilesh.

 

7111

 


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