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Steam Heater Condensate Delivery Pressure


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#1 BJD

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Posted 05 September 2014 - 01:54 PM

I would like to know what will be the pressure at the downstream of steam trap located in the Medium pressure(13 Kg/cm2, 230 Deg C)steam heater/exchanger condensate outlet. Is it possible to deliver that steam condensate downstream of steam trap to a deaerator or a condensate vessel having pressure of around 1.00 kg/cm2 . Steam used in the steam heater/exchanger will be at 13 Kg/cm2 pressure and 230 Deg C temperature. My assumption is that steam condensate at the exchanger outlet will be available at almost the same inlet steam pressure i.e. 13 kg/cm2 minus the pressure drop across the exchanger.we have steam trap located at the exchanger outlet for total condensation the exchanger outlet steam. What will be the condensate pressure still available at the downstream of steam trap ? Is it possible to deliver that condensate to a vessel having 1.00 kg/cm2 pressure? or do we need to put a condensate storage vessel and then pump it out to the pressure of 1.00kg/cm2?

 

Thanking you

Regards,

BJD



#2 PingPong

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Posted 06 September 2014 - 06:05 AM

Pressure just downstream the steam trap is simply the pressure in the destintion vessel (condensate vessel, or deaerator, or whatever) plus the pressure drop over the line between stteam trap and destination vessel.

 

With 13 kg/cm2 steam/condensate upstream there willl be absolutely no problem for the condensate from the steamtrap to flow to your destination vessel.



#3 BJD

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Posted 07 September 2014 - 08:58 AM

Thanks a lot PingPong.

I was thinking whether there will be any pressure after total condensation in the steam trap and if pressure exist then whether it will be possible to transfer that condensate to a de-aerator at elevated level having pressure of around 0.75 to 1.00kg/cm2 .If diversion to de-aerator is not possible then i am thinking of tranferring that condensate to a condensate vessel at DM water unit located approximately 150 meter distance.Please give valuable input once more in this regard. Can you estimate how much wiil be the pressure still remains downstream of steam trap with 13 kg/cm2 steam used in the inlet of steam heater?

Thanking you once again.

#4 BJD

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Posted 07 September 2014 - 09:23 AM

Ref previous posting

can you please tell me what will be the temperature in the condensate downstream of that steam trap?

#5 PingPong

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Posted 07 September 2014 - 10:28 AM

Condensate coming from the steam trap will partly vaporize (flash) and its temperature will be that what any steam table will tell for the pressure at the trap outlet.

 

What the exact pressure at the steam trap outlet will be depends on the condensate flowrate, the pipe diameter, the pipe length, number of bends and other fittings in the pipe, and elevation difference between top of deaerator and stream trap.

 

But with 13 kg/cm2 pressure upstream the steam trap I would not worry at all about sufficient pressure at the steam trap outlet.

 

Surely there are many more steam traps in the plant, some of them for much lower steam pressures (LP steam is typically 3.5 kg/cm2) which have no problem to deliver their condensate to the destination vessel(s).



#6 BJD

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Posted 07 September 2014 - 11:24 AM

Thank you PingPong.

#7 Bobby Strain

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Posted 07 September 2014 - 08:25 PM

But, if the process side pressure is greater than the steam pressure, a leak will contaminate the condensate.

 

Bobby



#8 BJD

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Posted 13 September 2014 - 11:35 PM

In our unit the exchanger that i am talking about uses steam at 13 kg/cm2 & 230 deg C having maximum flow 10 Ton/Hr through a 8 inch pipe. after the exchanger the steam condensate( partly condensed) is routed to the steam trap through a 2 inch pipe. we dont have pressure measurement instrument in the 2 inch pipe .  the exchanger pipe sizing 8 inch inlet to 2 inch outlet is due to the change in volumetric flow from steam to condensate conversion. pl inform if that 2 inch pipe which is going to the steam trap will still have sufficient pressure?   






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