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Dished Ends On A Vessel

Dished Ends On A Vessel

Dished Ends On A Vessel

(OP)
On a vessel, lets say 900mm ID, I am looking for the cheapest method of a end, a dished end or whatever is relevant, the flow characteristics should be good for water that never gets above 50°C.

RE: Dished Ends On A Vessel

If there is no pressure, use a flat plate.  If it is pressurized, the answer will depend on the pressure and the design code.  Flow characteristics aren't usually applicable to a closed end of a vessel.

RE: Dished Ends On A Vessel

(OP)
There is pressure applied, 7 Barg. Water is the medium and the vessel goes into backflush emptying from bottom to top.

RE: Dished Ends On A Vessel

Depending on the design code, method of construction (Partial RT, full RT, or no RT), and material of construction, a 2:1 elliptical would probably be a good choice.  You're at the mercy of finding a head manufacturer with tooling to match the ID and thickness you're looking for.

-TJ Orlowski

RE: Dished Ends On A Vessel

Lessee... 900mm ID is pretty close to a 36" OD. I'd suspect that if you can live with a somewhat reduced ID, your cheapest way to go is to have the vessel designed using 36" pipe with end caps and fabricated by a competent code authorized shop. Be sure you know which code is applicable to the jurisdiction in which the vessel will be installed.

The end caps might even be stock items at a large pipe supply outfit. In essence, they will be 2:1 SE heads, just fabricated to a piping standard.

It won't be very thick - if you assume a 3mm corrosion allowance you'll see a thickness on the order of 6 to 10 mm.

jt

RE: Dished Ends On A Vessel

You would need a 3/16" thick 80/10 at 105 psig and 250 F using a SS material.  Material selection will play an important factor since pressure is governing the design.  I don't think a 2:1 would be your best bet.  I would specify an 80/10 since the blank size would be small enough to nest the disc inside a 48" wide sheet.  Also you can use a 85% efficiency since the head is manufactured from one piece.  

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