Pressure Relief Valve Calibration Frequency / Guidelines
Vino Varghese
Eyup Tan
Pressure Relief Devices Performance Test Codes specified in ASME PTC 25 Standard.
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Kristian Lund Jepsen
I do not think Qatar has specific national regulation on the subject. Usually Qatar operates near to UK regulations.
In most European countries (including UK), todays approach is that the regulations within oil/gas sectors, require a risk based approach and the application of the ALARP principle to decide on the test frequency. From that strategys point of view you will need to consider: The likelihood of that a relief valve fails to open on demand (which very often is dependent on the manufacturer name and the service for the relief valve) + the consequence of a failed relief valve.
The risk based approaches are often based on recommendations given in for example the following recommendations and standards: API RP 576, EEMUA publication 188 (“Guide for establishing operating periods of Safety Valves”).
Reference can also be made to UK HSE report 363/2001: “Best practice for Risk Based inspection as part of a plant integrity management” (available on Internet).
For selection of initial test frequency something with an interval in the range 1 to 2 years would be appropriate, dependent on the possible consequence of a failed relief valve.
regards
Kristian
Kingslygeo Vargheese
If the relief valve gets popup during test. Is it required to do the calibration?
or it will release the excess pressure only?
Regards
Kingsly Geo
U WYNN-NAING
Dear Sirs,
Kindly find comment in RED.
Rgds,
WN
From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of Kingslygeo Vargheese
Sent: Tuesday, November 12, 2013 5:01 PM
To: material...@googlegroups.com
Subject: [MW:19258] Re: Pressure Relief Valve Calibration Frequency / Guidelines
Dear Friends,
If the relief valve gets popup during test. Is it required to do the calibration?
or it will release the excess pressure only?
PSVs popping and/or leaking during operations or having broken seals shall be inspected and re-tested regardless of requirement as assessed by RBI.
Regards
Kingsly Geo
On Thursday, 20 December 2012 10:45:43 UTC+3, Vino wrote:
Dear Experts,
We have a Client requirement for safety reason to have PRV (Pressure Relief Valve) in Piping for the Hydro test. The set Pressure is at 110% of Hydro test Pressure.
Piping Standard: ASME B 31.3, Ed'2010.
Query: What should be the frequency to have these calibrated? Please share any reference standard.
Re-calibration frequency for PSVs is based on the reference code/standard and as per individual company rules/procedure.
Normally 2 years to 4 years based on the characteristics of PSVs and actual pop up condition.
Here below are he reference:
ASME Boiler and Pressure Vessel Code (Section VIII – Pressure Vessel Division 1)
ASME National Board Inspection Code
API 510 Pressure Vessel Inspection Code: Maintenance Inspection, Rating, Repair and Alteration
API STD 527: Seat Tightness of Pressure Relieving Valves
API RP 576: Inspection of Pressure Relieving Devices
We would like to update this requirement in our Equipment Calibration Procedure.
Thanks & Regards
Vino, Doha
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chandrakant mohikar
Calibration of PRV is very important from risk and failure hazards of
PRV, consequences may be high. calibration it is highly skilled job in
PRV workshop that is approved one. top priority is to ensure it
operates at set pressure (105 or 110 %). it may be inspected /
calibrated as per operations requirement and plan, on abnormal
observation like leakage / fouling / failure to open at over pressure
set pressure etc. sometimes it is stuck and on tapping it pops up.
Calibration as per manufacturer for economical maintenance. it should
be determined by performance of PRV
Generally in each planned annual or biannual shut down all PRVs are
thoroughly inspected and calibrated especially high pressure systems
PRVs.
For more details you may refer API 576, ASME SEC VIII article R-1
general requirements, AR 140, 141 & 142
Regards
Chandrakant Mohikar- CSR
(ex. PDO VELOSI )