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Liquid Seal at the outlet from condenser to accumulator?

Liquid Seal at the outlet from condenser to accumulator?

Liquid Seal at the outlet from condenser to accumulator?

(OP)
Hi All, We have a P&ID showing a liquid seal (an inverted U) at the outlet from a Overhead(OH) condenser to the accumulator below. The accumulator is having a split range fuel gas/flare pressure controller. The flow is by gravity from the condenser to the accumulator as there is a pressure equalizing line between the two. Can this seal be for preventing the vapor binding of the condenser? Does the seal require a syphon breaker?

RE: Liquid Seal at the outlet from condenser to accumulator?

(OP)
Hy,
Again, Can it be for subcooling the liquid?

RE: Liquid Seal at the outlet from condenser to accumulator?

Reena, a possibility for the U-leg seal is that it is there to ensure that no vapor flows up that pipe. Please have a look at the discussion in thread391-137464 and see if it is applicable to your case.

Harvey

Katmar Software
Engineering & Risk Analysis Software
http://katmarsoftware.com

RE: Liquid Seal at the outlet from condenser to accumulator?

reena1957,

From your description I would think it is for subcooling. But it depends on the loop elevation relative to the condenser.

If the liquid velocity is more than 1 ft/s, vapour cannot flow against the liquid, and the system may siphon and oscillate. Thus, either the last vertical down pipe must be very large, or you need a vent to break the siphon.

Either way, I assume the pipe enter the overhead receiver at the top and there is no submerged internal pipe.

RE: Liquid Seal at the outlet from condenser to accumulator?

(OP)
Katmar I went through the thread and I feel you are 100 percent right.Thanks
Kruger,
the U seal covers the diameter of condender and the liquid inlet to the vessel is slotted at the lower half and submerged upto the bottom.
Thanks

RE: Liquid Seal at the outlet from condenser to accumulator?

(OP)
Sorry Kruger, One correction! the slot openings in the pipe are in both vapor and liquid phase of the accumulator.

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