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
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.
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 ??
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
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?
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!
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
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great and simple
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
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.
So nice way of understnd.thaks
Thank you for the explanation! Is a feed and Bleed operation the same thing?
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 ??
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
it is being used in iocl. in tank inlet outlet. so that oil should not leak
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?
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.
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.
What if block valve found passing after isolation
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!
Why not just used one single block valve in this design so we don't have to use bleed valve?
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