LB Compressor Series

RECIPROCATING GAS COMPRESSORS | PRODUCT BROCHURE

Where Innovation Flows

 SUPERIOR
PERFORMANCE
& RELIABILITY

Blackmer® LB Series
Reciprocating Gas Compressors
Oil-Free Gas Compressors for
Liquid Transfer and Vapor Recovery
Blackmer oil-free gas compressors deliver high efficiency in
handling LPG (including propane and butane), and anhydrous
ammonia. The LB Series Reciprocating Gas Compressors are
ideal for railcar, storage, and truck vessel unloading in addition
to associated vapor recovery applications. The single-stage
reciprocating gas compressors are designed to give maximum
performance and reliability under the most severe service
conditions. All LB Compressors are equipped with a ductile iron
head and cylinder providing greater resistance to both thermal
and mechanical shock. Additionally, the entire interior of the
crankcase is coated, with a specially formulated epoxy coating,
providing an added layer of protection for the compressor
Equipped with high-efficiency valves, steel pistons, self-adjusting
piston rod seals and other robust features, the LB Series
Compressors are designed for quiet efficient operation and ease
of maintenance, with all components readily accessible for simple,
quick, and easy replacement.
Models are available with liquid transfer delivery rates up 680 gpm
(2,575 L/min) and piston displacement capacities from 7 to 125 cfm
(11.9 to 212 m³/h) with working pressure up to 350 psi (24.13 bar).

SUPERIOR MATERIALS OF CONSTRUCTION

Equipped with high-efficiency valves, steel pistons, self-adjusting
piston rod seals and other robust features, the LB Series
Compressors are designed for quiet efficient operation.

LB601 SUPERIOR DESIGN

Designed so that components are readily accessible, LB Compressors
make routine maintenance and replacement of wear parts simple,
quick and easy.

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LB Series Reciprocating Gas Compressors | Design Features

High-Efficiency Valves
Move More Gas Volume Ductile Iron Pistons
Blackmer valves are specifically The one-piece, heavy-duty ductile iron
designed for non-lubricated
pistons are connected with a single
gas applications. With precisely
engineered clearances, spring positive locking nut. The pistons are
tension, and a special finish, stronger and simpler than multi-piece
these valves seat more positively designs with numerous fasteners
so more gas is moved with each which eliminates potential problems.
piston stroke. Blackmer valves
offer greater strength, quiet
operation, and long life.

O-ring Seals:
Head And Cylinder Self-Adjusting Piston Rod Seals
The head and cylinder are sealed Crankcase oil contamination and cylinder
with O-rings to ensure positive blow-by are prevented with loaded
sealing under all operating glass filled PTFE seals which maintain
conditions, eliminating leakage a constant sealing pressure around the
and maintenance problems. piston rods.

Ductile Iron
Construction
All pressure parts are
made of ductile iron
Pressure Assisted for greater resistance
Piston Rings For to both thermal and
Positive Seating mechanical shock,
and provides more
Constructed of self-lubricating
corrosion resistance.
PTFE, the special piston ring
design provides maximum
sealing efficiency with minimal
friction wear, resulting in peak
performance and extended LB361 cutaway
compressor service life.

Special Epoxy Coating Wear-Resistant Crosshead Assemblies

The entire interior of the Heavy-Duty Crankshaft The ductile iron crossheads are designed for
crankcase is coated with a maximum lubrication and wear resistance.
specially formulated epoxy The ductile iron crankshaft
coating, providing an added is precision ground with integral
layer of protection. counterweights for smooth, quiet
operation. Rifle drilling ensures Multiple Seal Options
positive oil distribution to the wrist For applications that require maximum
pin and connecting rod bearings. leakage control, double piston rod seals and
a distance piece chamber are available for
Pressure Lubricated Bearings
all Blackmer LB Compressors.
A rotary oil pump provides positive oil distribution to all
running gear components for long life and minimal wear. B L A C K M E R ®
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LB Compressor Series | Standard Features

Special Epoxy Coating

The entire interior of the crankcase is coated with a specially formulated epoxy coating, providing an added layer of
protection.

Ductile Iron Cylinder and Head

Ductile iron is stronger, much more resistant to thermal shock, and more corrosion resistant than ordinary cast iron.

O-Ring Seals Between the Cylinder and Head

O-rings in place of flat gaskets eliminate leakage and maintenance problems.

High Efficiency Valves

Designed to move more gas volume, Blackmer high efficiency steel valves are built for toughness and simplicity.
Constructed of corrosion resistant stainless steel discs and springs, the valves are easily removed for service without
disturbing the piping. With their simple design they are easily repaired and reassembled.

One Piece Piston with Single Positive Locking Nut

The one-piece ductile iron or steel piston and single positive locking nut are both stronger and simpler than
multi-piece designs with numerous fasteners found on competitor’s equipment.

Pressure Assisted PTFE Piston Rings for Positive Sealing

A special chamber ensures pressure behind the ring to provide maximum sealing efficiency with minimal friction wear.

No Packing Adjustment Nut

The Blackmer spring loaded packing never requires adjustment. No expensive scored rods due to over tightened packing.

Wear Resistant Crosshead Assemblies

The ductile iron crossheads feature special machined lubrication channels and ports to provide extensive lubrication
of the crosshead and guide. Wear is minimized and galling is eliminated.

Pressure Lubricated Crankcase

An oil pump directly driven by the crankshaft ensures positive lubrication of all bearing surfaces. The oil pump is
self-reversing for either direction of rotation and is available with an external automotive type oil filter for extra
protection.

Forged Steel Fittings are Standard on all “TU” and “LU” Mountings
All tees, ells, and crosses used in Blackmer Compressor piping assemblies are forged steel (2000# or better).

Standard Liquid Traps are Repairable and Easily Upgraded

The trap may be easily opened for inspection and cleaning of the interior and replacement of the stainless steel float.
Every trap includes a 1½" NPT opening for a high liquid level switch which can be added at any time.

14 Gauge Steel Belt Guard on all Mounted Units

Complete with a support brace, the heavy gauge guard is extremely strong yet can be removed for easy access to
the V-belts.

Oversized Main Bearings

Crankshaft main bearings on Blackmer Compressors are oversized, ensuring long life and durability. These bearings
will not need to be replaced during the compressor’s service life.

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 BLACKMER® LB COMPRESSORS

LB080 Series | LB081, LB082

The smallest LB Compressor available. This compact compressor
features one cylinder and is well suited for portable use, small vessel
unloading, and vapor recovery applications. The LB080 Series has a flow
rate of 8.45 CFM (14.35 m3/hr) at 825 rpm.

LB080 Series Technical Data:

Bore 3" (76.2 mm)
Stroke 2.5" (63.5 mm)
Piston Displacement @ 825 rpm 8.45 CFM (14.35 m3/hr)
Max. Power 5 BHP (4 kW)
Inlet/Outlet Connections 0.75" NPT

LB081 - Top End Repair Kit - 791129 LB081

LB081 - Intermediate Repair Kit - 791130

LB160 Series | LB161, LB162

Slightly larger than the LB080 series, the LB160 Series is a two-cylinder
compressor that features higher flow rates of 16.9 CFM (28.7 m3/hr) at 825 rpm.

LB160 Series Technical Data:

Bore 3" (76.2 mm)
Stroke 2.5" (63.5 mm)
Piston Displacement @ 825 rpm 16.9 CFM (28.7 m3/hr)
Max. Power 7.5 BHP (6 kW)
Inlet/Outlet Connections 0.75" NPT

LB161 - Top End Repair Kit - 792229

LB161 - Intermediate Repair Kit - 792230

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 BLACKMER® LB COMPRESSORS

LB360 Series | LB361, LB362

The LB360 Series two-cylinder compressor provides flow rates of
36 CFM (61.2 m3/hr) at 825 rpm.

LB360 Series Technical Data:

Bore 4" (101.6 mm)
Stroke 3" (76.2 mm)
Piston Displacement @ 825 rpm 36 CFM (61.2 m3/hr)
Max. Power 15 BHP (11 kW)
Inlet/Outlet Connections 1.25" NPT

LB361 - Top End Repair Kit - 793229

LB361 - Intermediate Repair Kit - 793230 LB361

LB600 Series | LB601, LB602

As one of the larger LB models, the LB600 Series is a two-cylinder compressor that
offers flow rates of 64.2 CFM (107.9 m3/hr) at 825 rpm. Additionally, LB600 Series
Compressors are equipped with special features not available on smaller units:
• The S3R oil control seal, only available in the LB602, keeps oil in the crankcase
and prevents oil migration within the compressor
• Special needle bearings designed for full load capability

LB600 Series Technical Data:

Bore 4.625" (117.4 mm)
Stroke 4" (101.6 mm)
Piston Displacement @ 825 rpm 64.2 CFM (107.9 m3/hr)
Max. Power 40 BHP (30 kW)
Inlet/Outlet Connections 2" NPT inlet/1.5" NPT outlet

LB601 - Top End Repair Kit - 794237

LB601 - Intermediate Repair Kit - 794238
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LB940 Series | LB942, LB943
Equipped with two double-acting cylinders, the LB940 Series compressors provide
high volume fluid transfer and gas compression for large applications from barges,
ships, and railcars. They offer high flow rates of 125.2 CFM (212 m3/hr) at 825 rpm.
These high-capacity compressors are also equipped with thick and robust wear parts
– piston rings, wrist pins, needle bearings and valves that will keep the compressor
operating over longer periods between maintenance cycles than the competition.
LB940 Series Compressors have numerous other construction, component, and
design advantages not found on competitive units.

SUPERIOR MATERIALS OF CONSTRUCTION

Constructed with materials that won’t degrade when exposed to harsh gases, the
LB940 Compressors reliably operate in demanding applications.
• PEEK valve plates with option for all stainless steel
• Stainless steel suction valve unloaders
• No yellow metals
• Steel wrist pin needle bearings
SUPERIOR WEARING COMPONENTS
Blackmer LB940 Series Compressor wear components are built to last, providing you with
peak performance and extended service life.
• Oversize piston rings for longer life
• Wrist pin needle bearing for even loading
LB943
• Oversize main bearings
SUPERIOR DESIGN
Designed for simplicity, Blackmer LB940 Series Compressors make routine maintenance and replacement
of wear parts simple, quick, and easy.
• Oversize valves for improved gas flow
• One piece piston with single lock nut
• Full load capability with needle bearings
• S3R oil control seal keeps oil in the crankcase and prevents oil migration within the compressor

LB940 Series Technical Data:

Bore 4 5/8 " (101.6 mm)
Stroke 4" (101.6 mm)
Piston Displacement @ 825 rpm 125.2 CFM (212 m3/hr)
Max. Power 50 BHP (37 kW)
Inlet/Outlet Connections 2" ANSI 300#

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 BLACKMER® LB COMPRESSORS

LB Compressors | Applications
Blackmer LB Compressors may be used in many industries and in many situations. In general, most LPG and
anhydrous ammonia applications will fall into two categories:

Liquefied Gas Transfer:

Many liquid transfer applications can be handled more
efficiently with a reciprocating gas compressor than a pump.
Compressors are especially well-suited for liquefied gas
transfer in situations where system piping restricts flow and
may cause a pump to cavitate.
The most common application of this technique is the
unloading of LPG and anhydrous ammonia from railcars into
stationary storage vessels or other situations that require
an initial lift to the liquid. Compressors can also be used for
general liquid transfer in a plant, such as storage tank to
transport or bulk truck, and back to a storage tank.
Tank car vapor recovery system
After the liquid has been pushed out of the vessel, a vapor
recovery operation is often performed.

Vapor Recovery:
When the liquid transfer phase has been completed, a significant amount of product in both liquid and vapor form
is left in the vessel, often 3% or more of the vessel’s capacity.
Recovery of the leftover gas or
liquid is vital for environmental,
safety and economic considerations
and can be done easily with a
reciprocating gas compressor. By
adjusting a valve, the pressure
reduces in the supply vessel,
which vaporizes the liquids. The
compressor will compress the
vapors slightly and discharge them
into the storage tank, where they
will condense back to liquid.
Specific applications of vapor
recovery are vapors left in a
vessel prior to a maintenance or
refurbishment operations, and
evacuation of cylinders, hoses
and lines.

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LB Compressors | Ancillary Equipment

For piping, in aiding for easy transition from liquid transfer to vapor recovery - comes with handle
4-Way Valves
and flow indicator

Float Switch Information Activates alarms and/or shut-down equipment when a liquid rises or falls past the switch

Activates alarms and/or shutdown equipment for suction, discharge, differential, and/or
Pressure Switches 
oil pressure 

Temperature Switches  Activates alarms and/or shutdown equipment for discharge and/or oil temperature 

Liquid Traps Trap installed in the suction line to stop liquid from entering the compressor

Liquid Traps, ASME Code ASME coded trap installed in the suction line to stop liquid from entering the compressor

Strainer Features a 30-mesh stainless steel screen 

Belt Guards  Standard material is steel, options are available for aluminum and stainless steel 

Pressure Gauges  Visual confirmation of pressure - typically on the suction, discharge, and oil locations 

Thermowells  Protects temperature monitoring devices from harsh process gas conditions 

Overpressure safety devices required on the compressor discharge and any associated
Relief Valves 
ASME code vessels 

Shutoff Valves  Available in either manual or powered 

Motor or Engine Drives  Available in various classifications and fuel types

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LB Compressors | Compressor Selections
To select a compressor that best fits your application requirements, use the charts shown. The data provided is
based on approximate delivery rates when handling LPG or anhydrous ammonia. Actual capacities will depend upon
line restrictions, size and length of piping. Horsepower requirements for both liquid transfer and vapor recovery
applications are based on moderate climatic conditions.

LB081 LB161 LB361 LB601 LB942

Compressor Model LB082 LB162 LB362 LB602 LB943
Number of Cylinders 1 2 2 2 2 Double Acting

Bore - Inches (mm) 3.0 1 (76.2) 3.0 2 (76.2) 4.0 2 (101.6) 4.625 2 (117.4) 4.625 3 (117.4)

Stroke - Inches (mm) 2.5 (63.5) 2.5 (63.5) 3.0 (76.2) 4.0 (101.6) 4.0 (101.6)

Piston Displacement - CFM (m3/h)

@ 350 rpm 3.58 (6.1) 7.16 (12.2) 15.3 (26) 27.2 (46.3) 52.46 (89.1)
@ 825 rpm 8.45 (14.35) 16.9 (28.7) 36 (61.2) 64.2 (109) 125.2 (212)

Compressor Speed
Minimum rpm 350 350 350 350 350
Maximum rpm 825 825 825 825 825

Maximum Working Pressure - psia (bar) 350 (24.13) 350 (24.13) 350 (24.13) 350 (24.13) 350 (24.13)

Maximum Brake - hp (kW) 5 (4) 7.5 (6) 15 (11) 40 (30) 50 (37)

Max. Discharge Temperature - ºF (ºC) 350 (177) 350 (177) 350 (177) 350 (177) 350 (177)

Max. Compression Ratio4

5
Continuous Duty 5 5 5 5 5
5
Intermittent Duty 9 9 9 9 9

Weight - lb (kg) ~180 (82) ~225 (102) ~365 (166) ~705 (320) ~905 (411)

Inlet/Outlet Connections 0.75” NPT 0.75” NPT 1.25” NPT *2.00”, 1.50”, 1.25” 2” 300# ANSI

1 One single-acting cylinder

2 Two single-acting cylinders
3 Two double-acting cylinders
4 Compression Ratio defined as absolute discharge pressure divided by absolute inlet pressure.
5 Compression Ratios are limited by discharge temperature. High compression ratios can create excessive heat, i.e., over 350°F (177°C).
The duty cycle must provide for adequate cooling time between periods of operation to prevent excessive operating temperature.

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 BLACKMER® LB COMPRESSORS

LB Compressors Selection Data | LPG & Anhydrous Ammonia

Approximate Liquid Pipe Diameter3

Speed Piston Displacement Driver Size2
Model Transfer Delivery1 Vapor Liquid
rpm U.S. gpm L/min CFM m3/hr HP kW in. mm in. mm
425 25 93 4.2 7.2 1.5 1.1
0.75 19
560 32 123 5.6 9.5 3 2
LB081 715 41 157 7.2 12.2 3 2 1.5 38
780 45 171 7.8 13.3 5 4
810 46 174 8.1 13.8 5 4 1 25
425 49 186 8.5 14.4 3 2
560 65 246 11.2 19.0 5 4
LB161
715 83 314 14.3 24.3 5 4 2 50
LB162
780 90 341 15.6 26.5 7.5 6
810 92 348 16.2 27.5 7.5 6 11⁄ 4 32
495 123 466 21.3 36.2 7.5 6
21⁄ 2 65
540 134 507 23.2 39.5 10 7
LB361
650 161 609 28.0 47.5 10 7
LB362
780 194 734 33.5 57.0 15 11 11⁄ 2 - 2 38-50 3 80
810 201 761 34.8 59.1 15 11
545 242 916 42.0 72.0 15 11
LB601 655 288 1,090 50.6 85.9 20 15
2 - 21⁄ 2 50-65 4 100
LB602 755 335 1,268 58.7 99.8 25 19
800 355 1,344 62.2 105.7 30 22
470 400 1,514 70 119 25 19
LB942 565 480 1,817 84 143 30 22
3-4 76-102 6 152
LB943 750 640 2,422 112 190 40 30
800 680 2,575 119 202 50 37
1 Delivery will depend on proper system design, pipe sizing and valve capacity.
2 Horsepower is for liquid transfer and vapor recovery in moderate climates. For liquid transfer without vapor recovery, horsepower will be lower. For severe climates, contact your Blackmer representative for horsepower required.
3 Use next larger pipe size if piping exceeds 100 feet (30 meters).

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 PSG Grand Rapids
1809 Century Avenue SW
Grand Rapids, MI 49503-1530
USA
P: +1 (616) 241-1611
F: +1 (616) 241-3752
info@blackmer.com
blackmer.com

Where Innovation Flows

502-004 01/20

Authorized PSG® Partner: Copyright 2020 PSG®, a Dover company

PSG® reserves the right to modify the information and illustrations contained in this document without prior notice. This is a non-contractual document. 01-2020