Pressure testing of large-diameter circulating water pipes: Can large-diameter butterfly valves be used as blind flanges for pressure testing?
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Dear sea friends, I have a question: For the pressure testing of large-diameter circulating water pipes in my project, can the butterfly valve at the outlet of the circulating water pump (DN1200) and the DN1200 butterfly valve in the boundary device be used as blind flanges for the pressure testing? How do you do it in actual projects? Thank you! Some people say that large-diameter butterfly valves can be used for blind flange pressure testing, while others say they cannot be used and that a head must be added; the pressure used for testing is 1.0 Mpa. What are everyone’s opinions? Thank you!
No, can the valve ensure 100% closure? There are significant safety risks.
Is it true that the larger the diameter, the greater the force per unit F=PS, and that some kind of thrust stop device is needed? I remember that the specifications state that end caps should be used for pipeline pressure testing; if it’s made of steel plate, then reinforcement or some kind of thrust stop device is required! Thank you, up above!
The common practice is to remove the valve and install a blind flange for testing, along with a pressure testing pump rated at 1.25 times the nominal pressure and a pressure gauge.
Reply to the corresponding floor so that the other party can see it. :For the handshake procedure, if I carry out pressure testing, both ball valves and butterfly valves should be in a semi-open state. Thrust devices – I’ve never used them.
Forget butterfly valves; it’s difficult to ensure that they don’t leak internally
If there is internal leakage, it doesn’t count; this does not meet the standards! Safety hazards are one of them!
Butterfly valves definitely cannot be used as blind flanges for pressure testing
For pressure testing of large-diameter circulating water pipes, the pressure is generally not high; it is sufficient to keep the pipe at a certain pressure under continuous operation and then conduct the inspection. This is perfectly fine for use within a company itself. If pressure testing is required after the completion of a project, blind flanges can only be used for this purpose; a blind flange is installed at the flange where the butterfly valve is connected, and its thickness can be found in the tables provided in the book \"Installation of Chemical Equipment\".
Don’t be lazy. Following the procedure means we can’t bear the responsibilities and consequences. The pressure isn’t really high, and the consequences may not be serious, but it will be troublesome if accountability is sought in the future.
Pressure testing of large-diameter pipes cannot include valves