4 replies to this topic

[processengbd]

I am undecided about the selection of TEMA type of head and rear head type

 

I would chose BEM but The problem is My client wants a removable tube STHE. And it would be single pass shell and single pass tube.

 

Stream Properties

Shell Side 

Fluid : Liquid

TEG Glycol

Temperature: 150- 120 deg F

Pressure: 1010 psig

Flow Rate: 260 Barrel/ day

 

Tube side

Fluid : Gas

TEG Glycol

Temperature: 90-95 deg F

Pressure: 1010 psig

Flow Rate: 60 MMSCFD

 

Regards

Processengbd

 

 

[Bobby Strain]

Not a good idea.

 

Bobby

[processengbd]

Sorry I dont understand .

Are you saying it is not a good idea to select removable tube.

I did not chose BEM as it is not removable.

 

Thank you 

 

Regards

processengbd

Edited by processengbd, 10 February 2014 - 12:53 AM.

[PingPong]

If the client wants a removable tubebundle then you should to provide a removable tubebundle.

 

There is no reason why in this case there should be a single tube pass, as the approach between shell and tube temperatures is large.

 

So select a BES with a square (90^o) or rotated square (45^o) pitch. Or a BEU if client accepts that tubes cannot be cleaned completely.

Edited by PingPong, 10 February 2014 - 05:19 AM.

[Art Montemayor]

Processengbd

 

You are undecided because of your inexperience in setting up your basic data and in the specific application.  This is a common and easy application that has been used world-wide in thousands of TEG dehydration units.  It is the cooling of Lean TEG going into the top of the TEG contactor using the dry product gas out of the contactor.  The greatest majority of exchangers used for this application are nothing more than a double-pipe unit.

 

You fail to identify the relative miniscule size of the TEG flow rate because you use the units Bbls/day.  Your TEG is flowing at 7.5 gal/min – a flow so small that it will yield laminar flow and a very weak heat transfer coefficient in a TEMA shell & tube unit – especially so when you apply a removable tube bundle!!!  If you insist on applying a single pass, shell & tube unit, you will wind up with an extremely long, skinny exchanger – similar to a double-pipe, but far more expensive.  By the way, what do you mean by “a removable tube STHE”?

 

The best service you can give your “client” is to advise him/her what a bad and terrible selection a TEMA exchanger is in this application.  It will result in a horrendous expenditure for such a small and simple heat transfer application.  This heat transfer application is a no-brainer.  Like Bobby says, this is "not a good idea".