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Older – now outdated - Danish regulations required 1.3 x design pressure.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