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Steam Line Warm Up


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#1 sudheer

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Posted 12 September 2014 - 12:40 AM

Greetings

We have a high pressure steam (40bar/400deg C) line with size 4" inside one of our plant.  The battery limit isolation valve is not having any bypass warmup line. We would like to know what is the basis (such as minimum line size, maximum steam flow etc.,)  for provision of warmup line and valve for steam headers.  Request forum to throw light on this aspect.

Thanks

 



#2 breizh

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Posted 12 September 2014 - 01:44 AM

https://www.google.f...rm up procedure

 

Probably a good start !

 

 

Breizh



#3 fallah

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Posted 12 September 2014 - 04:12 AM

sudheer,

 

AS per the required warm up rate, the size of the warm up by pass line could be between 1" to 2"....



#4 himant

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Posted 12 September 2014 - 04:52 AM

I totally agree with Fallah but I do have a doubt regarding the bypass line size.

 

Does it has anything to do with rate of temperature increase per unit time for metal?

 

Regards

Himant



#5 fallah

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Posted 12 September 2014 - 05:47 AM

Himant,

 

Controlling the rate of temperature increase per unit time during warm up operation is necessary to minimize thermal stress and prevent any damage to the system.  A typical rate is 50 C per 10 minutes...



#6 himant

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Posted 12 September 2014 - 06:20 AM

thanks a lot Fallah!

 

One more doubt that is this rate (i.e 50 degC/10 min) also applicable as cooling rate if we are doing start up for cryogenic plant?

 

Regards

Himant 



#7 breizh

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Posted 13 September 2014 - 08:46 AM

http://www.armstrong...ity-steam-mains

 

A reference from Armstrong attached above , in fact let sufficient time to minimize the thermal stress on piping and the risk to damage equipment (gasket,...).

 

>> maximum 100F in 8 minutes

 

>>>>> a bypass line # 1 inch should suffice

 

Breizh






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