5 replies to this topic

[FUNMILAYO]

Good Day Everyone,

 

Please I need your input/advise on the right formula to make use of (2 phase relief scenarios for Pressure Relief Valves) in API 520 PART 1 for the sizing of a 2 phase PRV,

 

the composition of the fluid (mol%)  is shown below:

 

N2 CO2 H2S Methane Ethane Propane i-Butane n-Butane i-Pentane n-Pentane Hexanes Heptanes Octanes Nonanes Decanes Undecanes Dodecanes Tridecanes Tetradecanes Pentadecanes Hexadecanes Heptadecanes Octadecanes Nonadecanes eicosanes plus

 

0.3

5.06

0 86.71 4.2 1.42 0.31 0.35 0.15 0.1 0.16 0.3 0.24 0.12 0.05 0.08 0.11 0.11 0.08 0.04 0.03 0.02 0.02 0.01 0.03

 

 

 

Thanks a lot in advance.

[serra]

normally I prefer HEM (more conservative) over HNE or HNE-DS,

API includes a description of the integral method,

you may find a Excel page with the method in this forum

 

http://www.cheresour...ng-temperature/

Edited by serra, 09 February 2018 - 04:25 AM.

[FUNMILAYO]

ManyThanks for your response Serra, I will check the link you posted now.

[breizh]

Hi ,

Hope this is helping you.

Good luck.

Breizh

Edited by breizh, 09 February 2018 - 06:22 AM.

[serra]

the paper "Select the Best Model for Two-Phase Relief Sizing" provided by Breizh shows the main differences between HEM and HNE,

HNE may give some advantages iin terms of sizing due to boling delay factor but otherways (liquid fraction at inlet < 0.8)  results are about the same,

in some cases (pure fluids) you can solve manually with the Omega Method discussed in API (see also the Lesser catalog provided by Breizh for a step by step solution) but for multicomponents miixtures you need to use a software,

the Excel page mentioned in my post #2 adopts a procedure equivalent to the integral method discussed in API,

you would need a software for the flash operations required,

the Excel page adopts Prode Properties, there is a free version available which includes hydrocarbons up to C15 (n-pentadecane)

[FUNMILAYO]

Many Thanks Breizh for your input.