Need drawings and technical details.

sounds like it would improve the surge performance.

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Thank you for the reply .we have Two surge vessels connected to the main discharge line of four pumps connected in parallel .The design pressure of the surge vessel is 9 bar whereas the discharge pressure of one pump is also around 9 bar .at a time 3 pumps will be operational.how will i know whether this 2 surge vessels is designed for these pumps properly

The surge vessel is non operational for more than 2 years

As surge vessel is only of use during a surge event.

It sounds a little odd to have design pressure and operating pressure so close , but what you may have is a requirement to pour fluid into the system on a trip or shutdown to prevent a vaccuum and flow reversal occuring.

You need to look closely or re-do the transient analysis. you can't tell anything from a steady state or a piping drawing.

"The surge vessel is non operational for more than 2 years" !!!

So it won't be doing it's job then.

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thank you for the reply .