Block and Bleed valve | What is a block and bleed valve used for? | block and bleed valve function.

[@Coreengineers]

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[@murulim1965]

How simply you explained my long pending doubt / question, Thank you sir

[@rajesh2oman]

great and simple

[@mawaddatali4184]

So nice way of understnd.thaks

[@zeineb8870]

Thank you for the explanation! Is a feed and Bleed operation the same thing?

[@chemhassan]

i wonder, what about the NH3 that already passed the 2nd I/V going to the pump. is it pumped entirely (but i think pumping this way will damage the pump as it only accepts liq or there is no air? ). im confused tbh

[@Coreengineers]

Liquify it first via providing steam then drain completely it could be easily ensured from the drain line....then only close the valve to give to maintenance.

[@amitkumar-sh2lk]

it is being used in iocl. in tank inlet outlet. so that oil should not leak

[@manikmule]

But if we are doing maintenance of Pump, then is it really necessary to bleed this small portion in between two i/vs, as per my understanding after right hand side i/v, there is drain valve arrangements, or else for extra precousinary measure at bleed valve, is there slope necessary ??

[@Coreengineers]

It's depends on process requirements...yes you must bleed that valve when you're stoping the pump or doing changeover so that any traces could be escape

[@sjcho1505]

Thank you for your explanation. Just one quick question. Do we drain NH3 to safe place through the bleed valve? I just want to know how to drain NH3 safely. Do we have to install tubing line to connect from the bleed valve to safe place?

[@Coreengineers]

we bleed it and sent to tank(where waste ammonia soln will come) so that it could be recover again via reaction to produce urea.

[@tisdale36]

We use these for phosgene, we have a vacuum system we call an evacuation that we hook to the bleed and it's always sucking on it.

[@escapade9657]

What if block valve found passing after isolation

[@Coreengineers]

it depends which block valve is passing if first one then close the upstream i/v and if second one then close first one ensure there is no gas from the bleed i/v. if both then close the upstream i/v of the first one! Hope you got the point!

[@solankiajendrakumar7607]

Why not just used one single block valve in this design so we don't have to use bleed valve?

[@Coreengineers]

this double valve is for the extra safety you may say let's suppose if there is a toxic fluid and your valve passes or malfunction so that's why there is a double valve and one bleed valve between them to bleed that toxic fluid