3 replies to this topic

[flash]

I would like to have some feedback regarding the appropriate location of an accumulator that I require to arrest the pressure surge in the fuel delivery system. The pressure surge is caused by a quick closing valve at the end of the operation.

There could be two possible locations to install the accumulator (1) close to valve (2) close to pump discharge NRV (which is quite a distance away). Vendors are not that cooperative during the pre-bid stage. I have received feedbacks in favor of both but I would like to have the experts advise backed by some sound technical reasons.

Much Appreciated.

[TS1979]

No experience on bladder accumulator. We normally install PSVs or rupture discs for the long water transfer lines. The pressure relief devices are installed at the pump discharges or at the upstream of the closure valves. It is preferably that the pressure relief valve is installed near the valve to be closed because the monemtum of liquid will be first acting on the section of the piping near the valve. However, since the pressure wave travels at a speed of 500 ~ 1000 m/s depending on piping material and liquid to be transferred, a few second delay may be acceptable if the pressure relief device is installed near the pump discharge provided that the valve is not a fast closing valve. The convenient location for the installation is another factor of consideration.

[flash]

The PSVs and RDs are not the solutions here as the line will experience the pressure surge several times a day due to the nature of the operation. It is not a good design to relieve the fuel everytime the operation is stopped. Another reason is PSVs are not considered as right mitigating devices for pressure surge scenarios due to their poor response time, RDs are used where quick response are needed. However, RDs too cannot be used for the reason cited above.
A slow closing valve or accumulator are not the only possibilities I guess. In my application valve is quick closing type which cannot be changed leaving the only mitigating device as accumulator.

[breizh]

Consider this resource .
It may support your query .
Breizh