Globe Valves

[Ezat Adel]

Dear Experts,

what's your opinion about attached image for (1/2 inch #1500 globe valve) which the stem nut attached to the bonnet with tack weld and as i know it's not acceptable to make a tack weld in valve body. could you give your opinion based on standards ASAP.

the manufacture code for this valve is API 602.

Regards 

[Johnson Madukayil]

Why was the stem nut tack welded to the bonnet in the first place? If you weld a nut to make it fixed, it no longer is a nut.

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[Sankaran Sp]

Dear expert, i would like to clarify my views for your doubts: a, Generally globe valve nut is tack welded with bonnet,because stem is rotating with hand wheel while opening or closing. b, To avoid the rotaion of nut,nut is tack welded with bonnet,any service point we can grind the tack weld and remove the nut. c, For gate valve, hand wheel is fixed with nut and rotating while opening,because stem should not rotate while opening. e, Both valves are made as per API 602 code Regards, Sankaran.SP Welding & metallurgy expert     --- On Sun, 17/3/13, Johnson Madukayil <jmadu...@gmail.com> wrote:

[Venkatesh]

Dear Expert,   What is the difference between IGC practice 'A' and 'E'?   Which is recommended for Austenitic stainless steels? Thanks & Regards P.Venkatesh

[prem nautiyal]

Hi

 

Please refer ASTM A 262.

 

Regards

 

Prem Nautiyal

Cell: 9769316004

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[fsa...@gmail.com]

You can perform both Pracice A as well E for SS. Basicallly it is as per the requirement of service condtion which tobe decided by designer/Clinet at per bid level. Please refer ASTM A262 for details.

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[Purav Desai]

Hi,

 

IGC Testing Practice A is Oxalic Acid Etch Test for Classification of Etch Structures of Austenitic Stainless Steels.

 

and

 

Practice E is Copper–Copper Sulfate–Sulfuric Acid Test for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels

 

So as indicated above, Practice A is rapid method of identifying, by simple etching, those specimens of certain stainless steel grades that are essentially free of susceptibility to intergranular attack associated with chromium carbide precipitates. As a result of this some specimens can be acceptabe and does not need further testing (B,C,E,F). Hence first this test is carried out for each material at first when Owner doesnot specify anything.

 

However in most cases owner specifies Practice E for Austenitic Stainless Steel.

 

Hope this helps.

 

 

Regards;

 

 

Purav Desai.

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Regards;

 

Purav DESAI

purav...@gmail.com