Sunday, April 28, 2013

RE: [MW:17581] Hydrotest pressure criteria

The hydrotest requirements are given by the largest of:

a)    Design standard requirements (ASME B31.3, ASME VIII, PD 5500, EN 13445, EN 13480, etc.

b)    National pressure equipment regulations.

 

Older – now outdated - Danish regulations required 1.3 x design pressure.

 

ASME typically 1.5 x pd x (fy/fy,t) – fy: Design yield stress at room temperature, fy,t: Design yield stress at design temperature)

(pd is the design pressure)

 

The PED (Pressure Equipment Directive) in Europe as well as EN 13445 and EN 13480 reguire the largest of:

a)    1.43 x Design pressure

b)    1.25 x design pressure x (fy/fy,t). – fy and fy,t as above.

 

In Europe the PED requirements are now implemented in all national regulations.

 

regards

Kristian

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of nishant nair
Sent: 27. april 2013 13:02
To: materials-welding@googlegroups.com
Subject: [MW:17573] Hydrotest pressure criteria

 

Why hydrotest pressure is taken 1.3 times of design pressure? What is the criteria that fixes the term 1.5 times or 1.25 times, etc.???

Thanks in advance,
Nishant nair
Sent from Yahoo! Mail

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