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[MW:25967] RE: Hello Sir; a query again

By Materials & Welding

Hi Vino,

 

A-36 steel does not have any guarantee for good impact properties at subzero temperature e.g. – 150Deg F.

 

In course of pneumatic test. if the temperature is to lowered to – 150 Deg F with exposure to 4 hrs , then as per my opinion A-36 steel is not the right material for test blinds.

 

A-36 should be safe at any other temperature (ambient or above).

 

Please see the following discussion on A-36 steel for general engineering guidelines.

 

Thanks.

 

Pradip Goswami, P.Eng,IWE

Welding & Metallurgical Engineering Specialist.
Ontario,Canada.
ca.linkedin.com/pub/pradip-goswami/5/985/299

pgoswami@quickclic.net

pradip.goswami@gmail.com

 

http://www.eng-tips.com/viewthread.cfm?qid=184793

From: Vino Varghese [mailto:vinopvarghese@gmail.com]
Sent: Friday, January 20, 2017 2:23 PM
To: pgoswami
Subject: Hello Sir; a query again

 

Hello Sir

 

Actually we are planning to carry out Pneumatic test of one of the BAHX (Brazed Aluminum Heat Exchanger ) at 76 bar  (design pressure ). The test will be done by using Nitrogen. The nozzle material at IN and OUT is 304L. The A36 material has been used as end blinds for testing purposes which will be later cut out. The weld consumable used is 309L. The thickness of the blind has been rightly calculated as per the thickness of nozzle and pressure. 

 

Query : The Nitrogen operating temperature will be much below -150F. My question is whether A36 is the right material chosen for the test blinds? This blind will be used only for temporary purpose and the total testing time including and filling should be completed within 4 hours.

 

Hope to see your as usual support and looking forward for a quick response as we are planning to call Halliburton for the testing tomorrow. 

 

 

 

Thanks and Regards 

Vino Varghese 

00974 66975678 

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