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PSV in output line of steam boiler

Wednesday, July 27, 2011   By: Brian [1274] 0 Stars
Hi guys

i want to put a PSV* in output steam line from boiler, Ope. Pressure : 6 bara, Ope. Temp. : 167 C , Q : 11 t/hr
i need to know how to find capacity for sizing this PSV*?
we have adual PSV that installedin boiler and this PSV* just for more safety when temperature rising so pressurewill be rised and PSV will be open.

best regards

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Friday, July 29, 2011   By: N.Ramani [965] 4 Stars
can you post a scheme for the existing arrangement and what u want to do,

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Saturday, July 30, 2011   By: Brian [1274] 0 Stars
Tank u, please check the picture.


PSV.pdf

Click on picture for full size view or to view PDF!

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Monday, August 01, 2011   By: N.Ramani [965] 4 Stars
You scheme is not very Clear in the absense of flow direction description of equipements etc.However pl note the following.If you have a PSV which I believe is a Safety Valve between the Boiler and the first isolating valvce you do not need a PSV after the valve.There is no chance for the pressure to rise as this valve itself will take care of any pressure rise.The present PSV should be able to discharge the maximum the Boiler can generate in the worst situation when the Boiler outlet valve gets closed by mistake and the firing is still on.If you install any PSV after the isolating valve it will never openn unless set at a lower pressure than the existing valve and there is a possibility of isolating vallve somehwere down the line gets clsoed when the generation is still on.I hope this is useful to you. All the best.
Ramani.N

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Monday, August 01, 2011   By: Brian [1274] 0 Stars
tanx for reply.

this PSV acc. to BS code shall be installed after superheater.
and as i know this PSV shall be open before the boiler safety valves.
this is not neccessry that this PSV discharge 100% boiler MCR. this is just for a moment that temperature rising so pressure will be rised.
but i dont know how to find capacityforthis PSV? somewhere read 25% but imnot sure.

tanx

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Monday, August 01, 2011   By: N.Ramani [965] 4 Stars
From your reply I guess that this valve will alos be located between Superheater and the Bolier oulet stop valve. Then it must be an ERV. electromatic relief valve which is actuated by a solenoid or something and not by direct steam pressure. If this is so as indicated by you around 20 to 30 percent may be OK. This is mainly provided to avoid opening of the Main vlave and creating a disturbance in the system.I am not a boiler designer. Plcheck it up. If you can have look at some Boiler designed by Bharat Heavy Electricals india or by Combustin Engineering USA you may get more information.

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Monday, August 01, 2011   By: Brian [1274] 0 Stars
tanx

i will be chech it out,

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Saturday, August 13, 2011   By: Jim Watts [764] 5 Stars
You do not have a superheater and you already have enough safety valves.

If you think you can put in another safety valve and fail to maintain the existing ones you are wrong. If you think you will get extra safety by having one you dont need you are wrong.

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