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The need for hot gas (or suction) riser traps WHEN YOU ALREADY HAVE PROPER VELOCITY

The need for hot gas (or suction) riser traps WHEN YOU ALREADY HAVE PROPER VELOCITY

The need for hot gas (or suction) riser traps WHEN YOU ALREADY HAVE PROPER VELOCITY

(OP)
I am wondering why traps are needed at the bottom of hot gas or suction risers when you have enough velocity to return the oil? I see them in every reference I can find, but no one explains why.

I fully understand needing them for situations where the compressor unloads or otherwise stages. I can see why you would reduce the diameter of the riser or install double risers with proper traps. But that is not what I am asking.

My question is why do I need a trap when I have a constant speed single stage compressor and my pipe already has enough velocity? In my specific example, I have a 20 ton system with a remote condenser on the roof. I am less than 100 TEL, so I have sized a 1-3/8" OD hot gas line. I will have an inverted trap at the condenser (and understand why it is needed); but, the manufacturer also wants a trap at the bottom of the hot gas riser.

Why is this trap needed when my velocity will be over 2,000 FPM?

Thanks for you help

RE: The need for hot gas (or suction) riser traps WHEN YOU ALREADY HAVE PROPER VELOCITY

My guess, based upon ACC above compressor, minimize oil or liquid working backwards to compressor during off cycle. Most the details were developed for recip machines to avoid liquid in the cylinder . You may want to rethink is its a scroll.

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