2 replies to this topic

[kritik]

Hi there,

 

I am new to this forum and am chasing some help with verifying that a design for a vent is appropriate.

 

Basically what is happening is that at my depot we have a vent for a hydrostatic relief valve. This is so that the discharge is diverted away from people operating on the depot and is released up high.

 

The pressure relief is set at 300kPa, has propane running through it.

 

I have no idea where to even start with determining if the vent is appropriate for it. It was a direction from the Australian department of energy authorities during a HAZOP they did to investigate if the vent is suitable as we have no documentation for it. The relief valve is underground also, so I cannot even determine the make or model of it.

 

Any guidance towards how I can decide if the vent is appropriate would help.

 

INFO: The system is a degassing station for 9kg LPG cylinders. The cylinders are placed upside down and has a nozzle connected to it. The LPG is pumped out of the cylinders and into a LPG tank. If there is liquid in the line and due to high temperature, the propane vapourises, the HRV is used to discharge the vapour to reduce the pressure in the line. 

 

Thank you

[fallah]

kritic,

 

Please upload a detail sketch of the system you described...

[latexman]

The relief valve is underground and you cannot determine the make and model?   This sounds like it is buried in the local soil.  If so, what idiot did this?  These valves have to be maintained!  First, have someone dig around it with hand tools (no power equipment), brush it off and see what you have, and move it to an accessible location or provide a pit (concrete construction?) big enough to work in with a cover.

 

Agree with fallah, upload the P&ID.