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Anonymous Poster

Set Pressure of Pressure Safety Valve

05/05/2010 8:52 AM

As per ASME section VIII Div 1, design pressure is 1.1 times of working pressure.

Then at what pressure are pressure safty valves to be set?
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Anonymous Poster
#1

Re: Set Pressure of Pressure Safety Valve

05/05/2010 10:41 AM

Normally the safety valves are set at MAWP or below - by your description (if I correctly interpret then the design pressure here is the MAWP ?
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dvmdsc
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#2

Re: Set Pressure of Pressure Safety Valve

05/05/2010 12:47 PM

Pressure safety valves must be set to protect the body (pipe, vessel, tank) AT or, between the working pressure and design pressure. FAR BELOW THE TEST PRESSURE.

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Abdel Halim Galala
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#3

Re: Set Pressure of Pressure Safety Valve

05/05/2010 11:06 PM

"As per ASME section VIII Div 1, design pressure is 1.1 times of working pressure"

Neither ASME nor any other code said that for any pressure vessel, the Design Pressure = 1.1 Working Pressure.

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Anonymous Poster
#4
In reply to #3

Re: Set Pressure of Pressure Safety Valve

05/06/2010 2:23 AM

What is design pressure as per ASME if working pressure or maximum pressure is known.?
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Abdel Halim Galala
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Engineering Fields - Piping Design Engineering - New Member Egypt - Member - Member since 02/18/2007

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#6
In reply to #4

Re: Set Pressure of Pressure Safety Valve

05/06/2010 2:14 PM

Please refer to my post #14 of CR4 Thread Test Pressure Higher Than Design pressure, How.

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PWSlack
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#5

Re: Set Pressure of Pressure Safety Valve

05/06/2010 3:25 AM
  1. There will be a plate on the pressure vessel giving the maximum working pressure when new.
  2. The pipework attached to it will have a maximum working pressure.
  3. The engineer/surveyor for the company responsible for assessing the system for the purposes of supplying burst indemnity insurance cover will have stated a maximum working pressure for the system at the last insurance examination and test. This information will be found in the General Register for the installation.

The safety valve should be set to relieve at or below the lowest of these three, and the setting recorded and placed alongside the latest-dated insurance report.

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Anonymous Poster
#7

Re: Set Pressure of Pressure Safety Valve

05/08/2010 9:32 AM

Dear Friends,

Unless stated specifically, the pressure vessels have:

a. The maximum working pressure,

b. Test pressure, and

c. Required constant supply pressure for operating systems.

Take the case of a boiler:

Required Constant supply pressure = 2 bar

Working pressure = 10 bar (to ensure uninterrupted steam supply at 2 bar pr.)

Test pressure of boiler = 15 to 16 bar (1.5 times)

Safety valve setting = 11 to 12 bar

Regards.
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rssahni
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#8

Re: Set Pressure of Pressure Safety Valve

05/08/2010 9:36 AM

Dear Friends,

Unless stated specifically, the pressure vessels have:

a. The maximum working pressure,

b. Test pressure, and

c. Required constant supply pressure for operating systems.

Take the case of a boiler:

Required Constant supply pressure = 2 bar

Working pressure = 10 bar (to ensure uninterrupted steam supply at 2 bar pr.)

Test pressure of boiler = 15 to 16 bar (1.5 times)

Safety valve setting = 11 to 12 bar

Regards.

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Users who posted comments:

Abdel Halim Galala (2); Anonymous Poster (3); dvmdsc (1); PWSlack (1); rssahni (1)

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