Flange Mounted Pumps for Bobtails and Transports
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 110 U.S. gpm (227 to 416 lpm).

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 379 U.S. gpm (757–1,476 lpm).

Maximum differential pressure for both models is 125 psi (8.62 Bar).

Hydraulic Drive Packages
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.

Selection Data
Pump delivery and brake horsepower requirements are listed in the table below for various differential pressures. The same data for all pressures is provided in the performance curves below.

click table to see larger

¹ Check the pump’s delivery and brake horsepower requirements in the performance curves below. See footnote with the curves which explains the factors that can cause delivery to vary.
² Maximum rated working pressure is 350 psi (24.13 Bar) for LPG and NH3 (limited by U.L. and N.F.P.A. 58).
Note: Refer to back cover for external bypass valve information.

Performance Curves

These curves are based on approximate delivery rates when handling propane or anhydrous ammonia at 80ºF (26.7ºC).
Line restrictions such as excess flow valves, elbows, etc. will adversely affect deliveries. For propane at 32ºF (0ºC), actual delivery will be further reduced to about 80% of nominal. Delivery of butane at 80ºF (26.7ºC) will be 60% to 70% of these values, and may run as low as 35% to 45% at 32ºF (0ºC). This loss of delivery is not a pump characteristic but is caused by natural thermodynamic phenomena of liquefied gases.

Companion Flanges and Flanged Elbows