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kkunal69
Member

Join Date: Jun 2010
Posts: 9

Temperature Control Valve Variation

06/11/2010 2:38 PM

We have a temperature control valve at the outlet of a stripper and the control valve(3 way temperature control valve) divides the stripper bottoms into two parts. The two parts go to stripper feed effluent exchangers. The control valve controls the temperature of the effluent coming from the final exchangers(3 exchangers in series).

Now the problem is that there is a temperature difference of 20-30 deg C between the two arms just downstream of the temperature control valve and the arm having lower temp has higher pressure. Can any one suggest any reason for it apart from instrumentation error?
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Tornado
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Technical Fields - Technical Writing - New Member Engineering Fields - Piping Design Engineering - New Member

Join Date: May 2009
Location: Richland, WA, USA
Posts: 21017
Good Answers: 795
#1

Re: Temperature Control Valve Variation

06/12/2010 11:09 AM

I couldn't understand the rationale for this layout. Can you describe it further with a sketch?

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Carl_E
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Join Date: Nov 2009
Posts: 335
Good Answers: 63
#2

Re: Temperature Control Valve Variation

06/12/2010 3:01 PM

The leg with the lower temperature has been shut off down stream of the diverting valve, hence close to the diverter there is 'pressure', but no flow through the pipe. The lower temperature is residual process heat conducted via piping

The leg with the higher temperature has all the flow, the valve is open fully to that leg, some pressure is dropped across the valve.

How do you do temperature control with a 3 way diverter valve? The temperature control schemes I'm familiar with use a 3 way valve to "mix" 2 flows to obtain a given temperature in the common outlet
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