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Subject: blowdown versus blowback
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mattwarrenUser is Offline
Intermediate Member
Intermediate Member
Posts:47

03/10/2012 11:02 AM  

What is the difference between blowback and blowdown? In class we were told that the blowback on a 100 lb safety valve must be at least 2 lbs.  I though blowdown was the difference in pressure between the mawp and the amount of overpressur through the valve. Kind of confused on this one.

RBobUser is Offline
Active Member
Active Member
Posts:65

03/11/2012 5:23 PM  
Hi Matt:

I've always heard 'blowdown' and 'blowback' used interchangeably-->referring to the spread between a safety popping and reseating.

BobH
mattwarrenUser is Offline
Intermediate Member
Intermediate Member
Posts:47

03/12/2012 4:28 PM  

Thanks Bob

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