Re: [PipingDesign] Valve material

From: <Hafiz>
Date: Tue Jan 15 2008 - 10:04:00 EST

i think there is a bit difference in the scope of the 2 Standards

Scope of ASTM A181

This specification covers nonstandard as-forged fittings, valve components, and parts for general service. Forgings made to this specification are limited to a maximum
weight of 10 000 lb [4540 kg].

Scope of ASTM A105

This specification covers forged carbon steel piping components for ambient- and higher-temperature service in pressure systems. Included are flanges, fittings, valves, and
similar parts ordered either to dimensions specified by the purchaser or to dimensional standards such as the ANSI and API specifications referenced in Section 2. Forgings made to this specification are limited to a maximum weight of 10 000 lb [4540 kg].

A181 is rarely used now a dayz and A105 is preferred material. Also there is a difference between A105 and A105 N... but there is no comparision of A216 and A105.. please clarify it.

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Hafiz Ali Alvi
E-MAIL halvi@jgc-descon.com.pk

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sviswan@technip.com
Sent by: PipingDesign@yahoogroups.com
01/15/2008 07:52 PM
Please respond to PipingDesign

         To:     PipingDesign@yahoogroups.com
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         Subject:        Re: [PipingDesign] Valve material

The standard is ASTM. You can buy them on the net.

ASTM A181 is for CS forgings for Gen purpose piping, has 2 classes, 60 and 70, corresponding to the SMTS. A105 is also same, can be used for higher temperatures also, corresponds to A181 class 70 in strength.

Why is the ball using metal seats? 316SS. What is you service, pressure, temperature?

316SS is a generic description of the material grade.

A182 is the product form, alloy steel forging.

The vendor's offer should be acceptable.

Sajit

.where can I check this. I mean
any standard.

Save a tree...please don't print this e-mail unless you really need to.

[Non-text portions of this message have been removed] Received on Tue Jan 15 10:04:00 2008