vacuum breaker in piping onboard ship

[Sebastian25051990]

thread378-446596


Hello , onboard ship we have installed vacuum breaker in piping which is for discharging liquid overboard.

Does this vacuum breaker only serves to protect the pipe against extensive vacuum which can be created due to siphon effect ?

Is siphon effect something it can damage the pipe if we dont have vacuum breaker installed ? As on the ship we are pumping liquid from one tank to a shore tank or barge,
therefore creating siphon in this piping is not necessary as the pump is pushing ?

Can anyone clear the doubts

TIA

Studen
Steven

 

[1503-44]

You probably want the siphon to stop when the pump stops.

Einstein gave the same test to students every year. When asked why he would do something like that, "Because the answers had changed."

 

[hacksaw]

The vacuum breaker stops syphoning after the pump stops (controlled stop), to avoid over filling the receiver.

 

[LittleInch]

Depends on your pipe.

If your whole system is steel pipe then vacuum is normally not a problem for the pipe. Any sort of flexible pipe though could collapse.

Vacuum breakers also prevent syponing.

Now if when you're pumping and the pressure when the pump stops is more than atmospheric then the vacuum breaker will not operate.

I don't understand your concern.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.