Blackmer TLGLF3 and TLGLF4 pumps are designed to flange mount directly to a commercial internal control valve, in combination with the tank of a bobtail or transport. Direct mounting eliminates the need for inlet pipes, shut-off valve and external strainer which can restrict flow and cause vaporization problems. The result is smoother operation and longer pump life.

Both models are equipped with a double-ended drive shaft for clockwise or counterclockwise rotation by simply changing position of the pump. Each model also has an auxiliary intake port which can be used for emergency unloading of another tank or transport. In addition, these pumps have an internal relief valve, patented cavitation suppression liners to reduce noise, vibration and wear.

Standard construction materials for both models include Buna-N mechanical seals and Duravanes for handling both LP-gas and anhydrous ammonia. The casing liner and end discs are replaceable for easy rebuilding of the pumping chamber if ever necessary.

The TLGLF3 is widely used on bobtails because of its compact mounting arrangement, with a 3-inch ANSI intake flange and 2-inch auxiliary intake and discharge ports. Capacities range from 60 to 129 U.S. gpm (227 to 488 L/min).

The TLGLF4 offers maximum output rates, and fast turnaround time for transports. It is designed with 4-inch ANSI intake flange, a 3-inch auxiliary intake port, and twin 2-inch discharge ports which permit the use of two hoses, if necessary, to reduce pressure loss when unloading into restrictive receiving systems. Capacities range from 200 to 350 U.S. gpm (757–1,325 L/min). Maximum differential pressure for both models is 125 psi (8.62 Bar).
Unit of Measure


Standard Pump (Factory Relief Valve Setting)

N/A 150 psi10.34 bar

Pump Speed

N/A 400 rpm500 rpm600 rpm650 rpm800 rpm870 rpm

Approx. Delivery of Propane at Differential Pressures and Pump Speed (50 PSI (3.45 Bar))

N/A 52 gpm70 gpm85 gpm93 gpm118 gpm129 gpm197 lpm265 lpm322 lpm352 lpm446 lpm488 lpm2.8 bhp3.6 bhp4 bhp4.3 bhp5.1 bhp6.5 bhp2.1 kW2.7 kW3 kW3.2 kW3.8 kW4.8 kW

Torque 50 psi (3.45 Bar)

N/A 36.2 ft-lb37.4 ft-lb39.3 ft-lb40.4 ft-lb44.2 ft-lb45.9 ft-lb5 kg-m5.2 kg-m5.4 kg-m5.6 kg-m6.1 kg-m6.3 kg-m

Approx. Delivery of Propane at Differential Pressures and Pump Speed (100 PSI (6.89 Bar))

N/A 40 gpm68 gpm75 gpm83 gpm107 gpm119 gpm151 lpm257 lpm284 lpm314 lpm405 lpm450 lpm4.8 bhp6 bhp7.1 bhp7.9 bhp8.7 bhp10.9 bhp3.6 kW4.5 kW5.3 kW5.9 kW6.5 kW8.1 kW

Torque 100 psi (6.89 Bar)

N/A 60.8 ft-lb61.5 ft-lb62.2 ft-lb63.7 ft-lb69.7 ft-lb72.5 ft-lb8.4 kg-m8.5 kg-m8.6 kg-m8.8 kg-m9.6 kg-m10 kg-m

Max. Differential Pressure

N/A 125 psi8.62 bar

Max. Working Pressure

N/A 350 psi24.13 bar


N/A 2" NPT Flanged 2" NPT Flanged Elbow 2" Weld Flanged 2" Weld Flanged Elbow

Auxiliary Intake

N/A 2" NPT Flanged 2" NPT Flanged Elbow 2" Weld Flanged 2" Weld Flanged Elbow Blanking Flange


N/A 3" 300 lb. ANSI Mounting Flange

Product Type

N/A Flange Mounted Pumps


N/A Blackmer

Selection Data

N/A Pump delivery and brake horsepower requirements are listed in the Performance Data table shown in More Images section for various differential pressures. The same data for all pressures is provided in the performance curves.

Hydraulic Drive Packages

N/A Blackmer 2-inch through 4-inch pump models are offered with complete factory engineered hydraulic drive packages. Blackmer highly recommends the use of hydraulic drive systems to maximize pump performance and extend equipment life, especially on truck mounted bobtail and transport pumps.
The Blackmer Hydrive cooler forms the heart of a hydraulic drive system, and offers up to 26 horsepower (19.4 kW) of actual heat dissipation. The Hydrive has a compact design with stainless steel. It protects the system during cold start-up, allows for remote system on/off control, and provides both system cooling and monitoring of oil filtration.
A typical hydraulic drive package includes a P.T.O., hydraulic pump, Hydrive cooler, cargo pump control valve, speed control valve, hydraulic motor, and mounting hardware. Hydraulic motor adaptor kits are also available to retrofit existing Blackmer LP gas pumps for hydraulic drive operation.

LPG Pump Warranty - One Year Performance Assurance

N/A Should any Blackmer LPG pump (LGL, TLGL and LG models) or bypass valve fail in the transfer of propane, butane and propane/butane mixture within one (1) year of the original installation or eighteen (18) months after shipment from the factory, regardless of cause (except for intentional or gross misuse), free replacement components will be provided to return the pump to as new performance.

This offer is limited to one claim per installation.
PLEASE NOTE: For the One Year Performance Assurance to be valid, a Blackmer Pump Warranty Registration must be supplied to Blackmer via web registration or postcard. For additional information, see Blackmer LPG Pump Warranty page #001-004.

Durability / High Efficiency / Quiet Operation / Easy Maintenance

N/A Blackmer offers a full line of liquefied gas pumps and oil-free gas compressors, designed for maximum performance and reliability. From the smallest cylinder filling operation to the largest, most sophisticated bulk plant/rail car unloading system, you will find Blackmer pumps and compressors operating throughout the world.

Sliding vane design is ideal for butane, propane, anhydrous ammonia, propellants, refrigerants and similar liquefied gases
Blackmer liquefied gas pumps are widely used for cylinder filling, motor fueling, bulk transfer, vaporizers, and on bobtails and transports.
Utilizing Blackmer’s unique sliding vane design, these positive displacement pumps offer the best combined characteristics of sustained high-level performance, energy efficiency, trouble-free operation, and low maintenance cost.
Pump models are available in 1 to 4-inch port sizes. All models have ductile iron construction for thermal shock resistance, low friction ball bearings for high efficiency and quiet operation, and threaded lock collars that prevent end thrust wear.

Cavitation Suppression Liners
1.25 through 4-inch models now have special liners that "cushions" the effects of collapsing vapor bubbles within the pump, sharply reducing the noise, vibration, and wear normally caused by entrained vapors.

How Blackmer Sliding Vane Pumps Achieve High Efficiency

N/A Blackmer pumps use a rotor with sliding vanes that draw the liquid in behind each vane, through the inlet port and into the pumping chamber. As the rotor turns, the liquid is transferred between the vanes to the outlet where it is discharged as the pumping chamber is squeezed down. Each vane provides a positive mechanical push to the liquid before it.

Vane contact with the chamber wall is maintained by three forces: (1) centrifugal force from the rotor’s rotation, (2) push rods moving between opposing pairs of vanes, and (3) liquid pressure entering through the vane grooves and acting on the rear of the vanes. Each revolution of a Blackmer pump displaces a constant volume of fluid. Variance in pressure has minimal effect. Energy-wasting turbulence and slippage are minimized and high volumetric efficiency is maintained.

Efficiency Means Energy Savings

N/A The high efficiency of Blackmer pumps means they require less horsepower than other positive displacement pumps. So you spend less on motors initially and less on electricity to operate the pumps after they are installed.

High Capacity at Lower Speeds Means Reduced Wear

N/A The volumetric efficiency of Blackmer pumps saves more than energy. Their inherently low slippage allows them to operate at substantially lower rpms than other positive displacement pump types, while still delivering equivalent output. These lower operating speeds mean quieter operation, longer service life, and reduced maintenance requirements.

Self-Adjusting Vanes Keep Performance High

N/A The performance of gear pumps will constantly diminish as wear increases clearances. To compensate for the reduced performance, you must increase the pump speed (which further accelerates pump wear) or put up with reduced capacity until performance drops to a totally unacceptable level. The vanes on a Blackmer pump automatically slide out of their rotor slots to continuously adjust for wear. No more speeding up to compensate and no more putting up with poor performance. Blackmer pumps maintain near-original efficiency and capacity throughout the life of the vanes.

Vane Replacement in Minutes, Easy Inspection

N/A Vane replacement is easy. Simply remove the outboard head assembly, slide out the old vanes, insert the new ones, and reinstall the head. In a matter of minutes, your pump is back in operation. Routine inspection is equally easy. In fact, most maintenance can be done without disconnecting the pump from its piping or drive shaft.

Replaceable Liners Economically Restore Efficiency

N/A Blackmer LGL pumps are equipped with replaceable liners that protect the pump casing and provide the economy of simple replacement, restoring the pump to like-new efficiency. No special tools are required to remove a worn liner and install a new one, and the simple operation can be completed in a few minutes without taking the pump off line.

UL and ISO 9001

N/A All pump (LGL158 is listed for use on LP-gas service only.) and bypass valve models described in this bulletin are listed by Underwriters Laboratories for both LP-gas and anhydrous ammonia service.