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# burst disk sizing for liquid flow with pump

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## burst disk sizing for liquid flow with pump

(OP)
I'm trying to verify the burst disk capacity of an existing system. The over pressure scenario is a pump continuing to pressurize a tubing system with a valve closed downstream. I'm using the resistance flow method because the tubing between the pump and the burst disk is 1/4" but the burst disk holder is 1/2", so the coefficient of discharge method doesn't apply. I was trying to follow the Fike burst disk sizing examples for the resistance to flow method but it really doesn't correlate to a pump pressure source. So how do I verify the burst disk capacity?

The particulars:

Pump flow = 0.0145 cfm
tubing internal diameter = .083"
burst disk size = 1/2" NPT
Krgl = 5.39
The pressure loss between the pump and the burst disk consists of a tube section, tee branch, expansion.
The burst disk outlet vents to atmosphere.

### RE: burst disk sizing for liquid flow with pump

A sketch would have been nice. Just calculate the backpressure on the pump discharge from the flow through tube section, tee branch, expansion, and open disk. If the BP is less than or equal to the allowable accumulation, it's okay. Refer to Crane TP 410. It has plenty of examples that will help you.

Good luck,
Latexman

To a ChE, the glass is always full - 1/2 air and 1/2 water.

### RE: burst disk sizing for liquid flow with pump

What are you trying to calculate? burst disc "capacity" isn't normally something you look at.

However equally I don't recall a bursting disc being used in these sorts of systems either, because they are too likely to go off and then take time and effort to replace and also the contents then have to escape somewhere. A pressure relief valve is much more common in this type of scenario.

A BD is normally used either where pressure build up is so rapid that a relief valve can't open in time (High pressure tube failure on S&T HX being a classic example) or where the likelhehood of an event is very very low and no one wants to have a relief valve.

Over pressure from a pump against a closed valve doesn't cover those scenarios.

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

### RE: burst disk sizing for liquid flow with pump

"Burst Disk" also known as a rupture disc, a pressure safety disc, burst disc, bursting disc, or burst diaphragm, is a non-reclosing pressure relief device that, in most uses, protects a pressure vessel, equipment or system from overpressurization or potentially damaging vacuum conditions.

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Sometimes its possible to do all the right things and still get bad results

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