engr2GW
Petroleum
- Nov 7, 2010
- 307
Hello all,
In the attached drawing, there is a control valve with isolation valves on either side of the control valve. A bybass is used to continue to flow gas if the control valve is to be maintained or worked on. each of the isolation valves have bleeds to bleed off pressure before working on the valve while flowing through the bypass. I have not seen any industry code and standard that require the isolation valves on either side to be two each (as opposed to one each as shown).
Is it required to have two valves to isolate?
experience or reference document will be appreciated if available.
Thank you in advance
As much as possible, do it right the first time...
In the attached drawing, there is a control valve with isolation valves on either side of the control valve. A bybass is used to continue to flow gas if the control valve is to be maintained or worked on. each of the isolation valves have bleeds to bleed off pressure before working on the valve while flowing through the bypass. I have not seen any industry code and standard that require the isolation valves on either side to be two each (as opposed to one each as shown).
Is it required to have two valves to isolate?
experience or reference document will be appreciated if available.
Thank you in advance
As much as possible, do it right the first time...