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[Siraj]

We have  De-ethaniser overhead condensors with following spec.

 

Shell: 23.5b   -45/85 deg c   Tube: 35b   -91/65 deg c

 

Shell: 3.8b    1.5/10 deg c    Tube 30.7b   20/10.3/6.7 deg c

 

LTCS  Tube: 3 1/2 % nickel  Duty: 11113 Kw.

 

 

Ref inlet line: 16 '' with Level control valve 12 '' and outlet line 24'' line  flare line is 6''----- 2'' line.// De-pressurising line 4''----6'' to flare.

 

During Gas turbine driven refrigerant compressor swap over, we are unable to do it online swap. So we stop one and start another ( this limitation needs to be studied for a online change over too ). During this time, I want to know the feasibility of taking 6 bar liquid propane inlet the exchanger and either flare it via the 2 '' PSV bypass line or the Blow down line 4''.

 

The normal propane refrigerant line is upstream 6 bar and down stream suction drum pressure 3 bar

 

If i do so, then will i be able to acheive chilling of de-eth overheads from  with temp dif of 5-8 degrees with a flow rate of 85 tph ethane flow??

Edited by Siraj, 10 February 2014 - 04:29 PM.