3 replies to this topic

[August]

I have a vaporizer: LNG to NG

 

Tube side is the process side. There are two ESD valves at the inlet and outlet of tube side to block the evaporator.

 

We need to size the relief valve installed at the outlet line for the situation when the HX is blocked.

 

How to do that exactly?  Thumb of rules?

 

Thanks.

[fallah]

I have an evaporator: LNG to NG

 

Tube side is the process side. There are two ESD valves at the inlet and outle of tube side to block the evaporator.

 

We need to size the relief valve installed at the outlet line for the situation when the HX is blocked.

 

How to do that exactly?  Thumb of rules?

 

Thanks.

 

August,

 

The PSV set pressure would be the tube side design pressure...

The relief load can be estimated based on the method mentioned in API 521 for fire case but with heat source of heating fluid instead fire...

[Bobby Strain]

But you must also explore other scenarios. Such as blocked outlet. And route the discharge to a system that will accept LNG at -150 C.

 

Bobby

Edited by Bobby Strain, 21 June 2017 - 11:35 AM.

[IGC]

What kind of heat exchanger is it?  Ambient air vaporiser?