coolhandlew
20-05-2014, 11:28 AM
Hi all,
I have a small problem! Last year I installed 4 x 100kw Edpac close control R410a DX systems to a data centre. The pipe run is around 50m, 7/8" liquid, 1 1/8" gas very well supported on bracketwork with cushion clamps approx every 1.2m. Thing is, one of the liquid pipes has moved along the brackets. This has happened along a 25m straight section of the pipework and has stressed the elbow at each end of this stretch. It has actually moved around 120mm. This has happened on only one of the circuits.
At first my theory was that liquid travelling along the liquid line at high velocity was essentially pistoning into the elbow and forcing it through the cushion clamps, the elbow is not a particularly long radius. There are no check valves on the pipework (not in manufacturer spec) so there is some migration of liquid to the condenser. Thing is, even if all the liquid is in the condenser this slug of liquid coming down the pipe should be held up as it compresses the vapour ahead of it.
The next component down line from this is the EEV which I have proved does step fully closed on the off cycle.
The compressor is VSD so it obviously ramps up.
.115191152011521
Has anyone seen anything like this before??
I have a small problem! Last year I installed 4 x 100kw Edpac close control R410a DX systems to a data centre. The pipe run is around 50m, 7/8" liquid, 1 1/8" gas very well supported on bracketwork with cushion clamps approx every 1.2m. Thing is, one of the liquid pipes has moved along the brackets. This has happened along a 25m straight section of the pipework and has stressed the elbow at each end of this stretch. It has actually moved around 120mm. This has happened on only one of the circuits.
At first my theory was that liquid travelling along the liquid line at high velocity was essentially pistoning into the elbow and forcing it through the cushion clamps, the elbow is not a particularly long radius. There are no check valves on the pipework (not in manufacturer spec) so there is some migration of liquid to the condenser. Thing is, even if all the liquid is in the condenser this slug of liquid coming down the pipe should be held up as it compresses the vapour ahead of it.
The next component down line from this is the EEV which I have proved does step fully closed on the off cycle.
The compressor is VSD so it obviously ramps up.
.115191152011521
Has anyone seen anything like this before??