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RE: [MW:13183] Fasteners for Nace MR0175

By Materials & Welding

Dear Manpreet,

Thanks for your mail please note ASTM A320 B8M Class 1 is low strength bolts and can be used for 150# or 300# only please refer ASME B16.5 clause 5.3.4 and also see table 1B.

A-320 B8M Class-2 are having more hardness so cannot be used for NACE MR0175 application.

Regards

Vinod Kataria

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of manpreet
Sent: Friday, December 09, 2011 4:53 PM
To: materials-welding@googlegroups.com
Subject: Re: [MW:13180] Fasteners for Nace MR0175

 

Hi Vinod,

 

ASTM A193 or ASTM A320 Gr. B8 or B8M cl.2 are can be used within temp. range of -196 to +300 Deg C, could you please elaborate why A320 B8M class-1can not be used for 1500#, Material selection does not depend on pressure class, for higher classes thickness would increase.

 

Please correct me if i am wrong.

 

Regards

Manpreet Singh




From: "Vinod Kataria" <vinod.kataria@blissanand.com>
Sent: Fri, 09 Dec 2011 15:10:29
To: <materials-welding@googlegroups.com>
Subject: [MW:13166] Fasteners for Nace MR0175

Dear All,

Please note for one of our ongoing project we have offered fasteners for our Level Gauge as ASTM A-320 Gr B8M cl-ass 2 which is suitable for low temperature and High Pressure Rating but our customer asking these fasteners conforming to NACE MR0175 also for this application ASTM A-320 Gr B8M cl-ass 1 is suitable but they cannot be used for high pressure rating i.e. 1500# so request suitable fasteners which will meet following service requirement:-

1.      NACE MR0175 (Hardness Should be below 22 HRC).

2.      Service Temperature -100 degree C.

3.      Pressure Rating 100 bar.

Thanks in advance for your kind help.

Regards

Vinod Kataria

+91-9560199004

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