Henry Catalogue 2010 - page 50

Industrial & Commercial Refrigeration Products
Helical Oil Separators: The helical oil separator features a centrifugal
flow path achieving approximately 99% efficiency of oil separation with
low pressure drop. Testing by an independent laboratory found that only
.006% oil by volume was being discharged into the system after leaving a
helical oil separator.
How the Helical Oil Separator functions: Upon separator entry,
refrigerant gas containing oil in aerosol form, encounters the leading edge
of the helical flighting. The gas/oil mixture is centrifugally forced along the
spiral path of the helix, causing heavier oil particles to spin to the perimeter,
where impingement with a screen layer occurs. The screen layer serves
dual functions as an oil stripping and draining medium. Separated oil flows
downward along the boundary of the shell through a baffle and into the oil
collection area at the bottom of the separator. The specially engineered baffle
isolates the oil collection area and eliminates oil reentraintment by preventing
turbulence. Virtually oil-free refrigerant gas exits through a fitting
just below the lower edge of the helical flighting. A float activated oil return
valve allows the captured oil to return to the crankcase or oil reservoir,
thereby completing the oil circuit. Our Patented Mechanical Design offers
high oil separation efficiency, plus the following advantages not found in a
Coalescing Oil Separator:
• Low pressure drop throughout the entire range of velocities found in a
refrigeration system.
• No clogging elements because of too much oil in the system.
No oil blow-out at start-up from oil left in a coalescing element.
Oil can be drained from the separator when necessary through a 1⁄8" NPT
fitting at the bottom of the separator.
How the Conventional Oil Separator functions: Refrigerant gas from
the compressor containing oil in aerosol form enters the separator and passes
through the inlet baffling. As it passes through the inlet screen, the fine
particles collide with one another and form heavier particles that impinge
on the surface of the shell wall. The gas then passes through the outlet screen
where there is a final separation. The oil free gas escapes through the outlet
fitting and goes to the condenser. The separated oil drips to the bottom of
the separator where a float operated needle valve returns the oil to the
crankcase or oil reservoir in the same way as the Helical Oil Separator.
Selecting the size of an Oil Separator: Although Oil Separator catalogs
show capacity in tons or horsepower, the actual tonnage or B.T.U.
capacity of a system may vary widely from the horsepower size of the
The selection of an oil separator should be completed using the methodology
shown on page 4. It is important this process not be ignored as it will affect the
oil separation efficiency. The DCFM and tonnage ratings have been developed
around internal testing to allow wide enough ranges where the oil separation
efficiency is optimal and pressure drop is no greater than 0.5 psi.
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