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Blackmer Oil-Free Gas
Compressors
Models LB161, LB361, LB601 & LB942
Blackmer oil-free gas compressors
deliver high efficiency in handling propane, butane,
anhydrous ammonia and other liquefied gases. They
are ideal for rail car unloading and vapor recovery
applications. These single-stage, reciprocating compressors
are designed to give maximum performance and reliability
under the most severe service conditions. All pressure
parts are of ductile iron construction for greater
resistance to both thermal and mechanical shock. They
are designed for ease of maintenance, with all components
readily accessible.
Models are available with capacities from 7 to 125
CFM (11.9 to 212 m3/h) with working pressure up to
425 psia (2931 kPa).
Gas compressors for liquid transfer
Many liquid transfer applications can be handled more
efficiently with a gas compressor than a liquid pump.
They include unloading of transports and pressure vessels
where system piping restricts flow and may cause a pump
to cavitate; unloading of LP-gas from rail cars, and other
installations that require an initial lift to the liquid.
How liquid transfer is accomplished
When transferring liquid, a compressor creates a slight
pressure differential between the vessel being unloaded
and the receiving tank. The suction stroke of the compressor
piston draws in vapor and decreases the receiving tank
pressure. The discharge stroke moves a measured volume
of vapor at a higher pressure into the supply where it
displaces an equal volume of liquid through a separate
line into the receiving tank. Generally, the liquid flow
rate will be 5 to 6 US gpm for each cubic foot of piston
displacement (670-775 liters per cubic meter).
Gas compressors for vapor recovery
When the liquid transfer phase has been completed, a significant
amount of product (vapor and liquid) is left in the tank
car ( often 3% or more of the tanks capacity). Recovery
of product with a compressor is a simple operation, where
a compressor can quickly pay for itself.
How
vapor recovery is accomplished
Vapor recovery is accomplished with the use of a four-way
valve. By rotating the valve handle ninety degrees, gas
flow is reversed and the vapor pressure within the supply
vessel is reduced. At this point, remaining liquid vaporizes
and is quickly recovered. As the tank pressure is drawn
down further, remaining vapors are also recovered to an
economical level. Recovered vapor is discharged into the
liquid area of the receiving tank and then condensed back
to a liquid state.
Standard Compressor Packages
Blackmer offers a variety of factory assembled compressor
packages to fit most application requirements. Standard
base mounted units are available in the following styles.
- CO - Compressor Only Includes basic compressor
with flywheel.
- B - Base Mounted Unit Includes compressor,
pressure gauges, formed steel base, V-belt drive with
belt guard and adjustable motor base, less motor.
- E - Extended Shaft Includes compressor with
flywheel and extended crank shaft.
- TU - Transfer Unit Includes compressor,
pressure gauges, formed steel base, ASME code stamped
liquid trap assembly (complete with relief valve and
a NEMA 7 electric float switch for Propane service),
V-belt drive with belt guard and adjustable motor
slide base.
- LU - Liquid Transfer/Vapor Recovery Unit Includes
compressor, pressure gauges, formed steel base, liquid
trap assembly with a mechanical float, inlet strainer,
interconnecting piping, 4-way valve, V-belt drive
with belt guard and adjustable motor base, less motor.
- LC - Liquid Transfer/Vapor Recovery Unit Includes
compressor, pressure gauges, steel base, ASME code
stamped liquid trap assembly (complete with relief
valve and a NEMA 7 electric float switch for Propane
service), inlet strainer, interconnecting piping,
4-way valve, V-belt drive with belt guard and adjustable
motor base, less motor.
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