sea water network calculation, standards???

[omli]

salam,

Please i have to design a sea water network to feed heat exchangers all over an LNG plant (renovation) , the network will be upground, there is heat transfer calculation also, sea water temperature must not exceed 28 °C at the exchangers inlts, what software i have to use, hysys is not very useful for such jobs, wrong?
sea water at the outlets of heat exchangers is collected and rejected to sea, what velocity i use in this collector, any one have standards about this please help.
any suggestion is welcome,
thank you,

sorry if there is language mistakes, i am not too well in english

[omli]

there are

[pascalderks]

Hi Omli,

Question....why are you using see-water? Is the amount of water that is needed for cooling that high?
By using reversed osmose you would be able to change the seawater into less agressive water.
see:

[link Point to another website Only the registered members can access] Adding the BMEX-module of Grundfos you also could do this without loosing a huge amount of energy.
For more info:

[link Point to another website Only the registered members can access]
If you really need to use seawater, please keep in mind that the systemsmaterials you should use need to be of a very high quality, (heat-exchanger of Titanium). Stainless steel will not be the right choise because of SS *****ing as a result of the high amounts of chlorides. Normal iron will also start corroding rappidly.
Maybe you can consider, if not already there, to use evaporative cooling towers. As watertreatment you could use HydroVRTX, a technical solution compared to chemical watertreatment.

[link Point to another website Only the registered members can access] A helpfull link could be:

[link Point to another website Only the registered members can access]
(site with software Shell & Tube Heat Exchanger Design)

I hope this info helped you...

Good luck

Pascal (NL)

[waelgs]

Dear Omli,
It seems that your design is for common coolig water system. so please take care about the following
1. what is the ambiet temp. for see watr?
2. for design heat exchanger network, HEXTRAN is better than hysis as a software
3. 70/30 or 90/10 Cu/Ni is the best material for tub side (sea water side) in the Heat Exch.
4. water velocity (1 m/s minimum)
5. tak care about the temp. of effluent water to the Sea (environmentally wise)

[omli]

dear pascalderks
thank yuuuuoooooo

it's not practical to treat sea water to be used only for cool other process fluids, in LNG plants, sea water is used to cool MCR, Propane, and other refrigeration loops, column condensers, lubrificant coolers and many other fluids, so it is used i its raw state, and then it will be rejected back to sea. ok.

[omli]

dear waelgs
thank youuuuuuuuuuuuuuu very much, if you have some papers about