Interpretation Double bloc and bleed
Interpretation Double bloc and bleed
(OP)
We interpret double block and bleed function as DBB valve or manifolds used in instrumentations systems (Swagelok / Parker Style)
But for Bigger size pipe line valves (around 12") the same terminology is used (Kuka/Kace catalogues)
Can somebody add more on the mechanism of this type sealing
Thanks
But for Bigger size pipe line valves (around 12") the same terminology is used (Kuka/Kace catalogues)
Can somebody add more on the mechanism of this type sealing
Thanks





RE: Interpretation Double bloc and bleed
Some companies require that the double block be two independent valves separated by some distance (from inches to miles), others consider a trunion ball valve with a functioning body bleed to be adequate. Some companies have restrictions on what can be done downstream of DBB (one company that I work with does not allow hot work in a confined space to be done downstream of DBB).
David Simpson, PE
MuleShoe Engineering
www.muleshoe-eng.com
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
The harder I work, the luckier I seem
RE: Interpretation Double bloc and bleed
It is common for valves to leak. If relying on a double block and bleed in hot work, a flange or equivalent may also be used downstream of the block valve.
RE: Interpretation Double bloc and bleed
jt
RE: Interpretation Double bloc and bleed
the sequence is as follows:
block valve
double flanged spool piece with bleed
spectacle blind
double flanged spool piece with bleed
block valve
saludos.
a.
RE: Interpretation Double bloc and bleed