2 replies to this topic

[chemks2012]

Hello All,

As discussed earlier, [please refer this thread: http://www.cheresour...ressure-query/] the reactor is having an independent bursting disc installed [without any relief valve] on it. And as per the discussion earlier the back pressure should be less than 50% of set pressure. I have now re-estimated the pressure drop across the bursting disc discharge line and it is more than 50% of the set pressure i.e. set pressure is 1barg and pressure drop is 0.6bar. However, I think we can get away with this restriction [50% of set pressure] as the bursting disc is reverse acting [i.e. the bursting disc manual says : [i]Due to the reverse acting compression mode of the disc it is also totally immune to backpressures and vacuum]. [/i]Any comment/help?

Please note that it is a low pressure reactor and has bursting disc set at 1barg. As this is the case, how such discharge line [with pressure drop of 0.6bar] will be affected if we install a relief valve in combination i.e. relief valve at the downstream of the existing bursting disc? I think it will cause more problem as the set pressure [1barg] is too low [?]. Any comment?

Thanks in advance.
KS

[Bobby Strain]

I know of no limiting built-up backpressure for a rupture disk. You calculate flow through the piping and disk with conventional fitting and line k values. The disk manufacturer labels k for the ruptured disk and provides them to you in the literature.

Bobby

Edited by Bobby Strain, 06 October 2012 - 07:47 PM.

[fallah]

KS,

Please upload a simple sketch of the RD/PRV combination. Are they configured in closed couple? Anyway you have to consider 3% rule of pressure drop limitation in PSV inlet line during fluid relieving.

Fallah