Double Stage Centrifugal Pump for Liquefied Gases

MG pump is especial for the unloading of liquefied gases transport (ammoniac, carbonic gas, freons, etc.). Being centrifugal, and having no friction parts, it is noiseless. The unloading is fast because the pump is connected to the truck with a kind of communicating glass. When gases are produced in the hoses, the chambers and turbines' system recycle the gases and take them back to the tank, keeping the pump plenty of liquid and producing a faster mass unloading.

En muchas ocasiones la bomba tiene que trabajar a 25kg/cm² lo que produce un esfuerzo muy grande al sello mecanico. Para ello Bombadur ha desarrollado un sello mecanico balanceado que prolonga la vida util y permite trabajar sin el sistema de lubricación de aceite para rodamientos.

Employment
• Freight distribution of liquefied gases
• Fractionation of liquefied gases into small cylinders

Advantages
• Able to work with gas and fluid
• The auto-recycling system allows just liquid outcomes.
• There is no cavitation
• Minimum NPSH 0 m
• The gases don't need to be drained for working

General Measures

Centrifugal Pump
For years, centrifugal pumps have been used for carrying heavy fluids or with solid components.
The company has used this system over the last 26 years to replace regenerative pumps -or paddle pumps- in the decantation of Liquefied Gases such as ammoniac, carbonic gas, LPG and freons. The centrifugal system was never considered for this task because of the cavitation -the pressure and flow rate drop at the moment of the pump's generation- but the company has developed a pump with a degasification system. This system allows to work simultaneously with gas and fluid, letting just the fluid to come out, and eliminating by gravity the gas or bubbles located into the pump's chamber, avoiding the cavitation.
The pump's chamber system let you to work with a NPSH -or low manometrical level-, because it doesn't need to work flooded or with a particular installation for getting a manometrical level. The reason is that the pump begins to generate immediately after the ignition, due to the fluid's pressure and the high suction power. Therefore, complicated operations are not needed, and the installation of the pump is simple.

Mechanical Seal
The mechanical seal works into the pump's chamber: the pump is refrigerated by the same fluid being decanted and the mechanical seal's service life is increased.
Frequently, the pump works at very high pressures, producing a bigger effort in the mechanical seal's track. In order to avoid this situation, a balanced seal has been designed, dividing the pressure strength and letting the seal work softly. It increases the tracks' service life and don't let the engine to absorb the pressure effort.

Alignment
Our models have an auto-aligning coupling system, due to the coupling and lantern system designed by the company. This system allows the axle's engine to go forward and backwards at the moment of driving; this avoids the bending of the axle's gaskets and the transmission of effort to the pump's bearings. All of this, along with the fulcrum into the pump's chamber and the perfect balancing of mobile parts assures a non-vibrating and noiseless performance.

Why there is no cavitation in our pumps:
All of our pumps have a degasification chamber, which allows the evacuation of gases produced by installation problems. Such evacuation is made through the turbine's suction antechamber and the gases return to the system due to the leveling.

They don't need a By-Pass:
The pumps have a very simple installation system because they don't need a safety valve. The pump reaches the tank or reservoir fluid and pressure's level; therefore, even when the pump is still generating pressure and flow once the unloading is over, there is no danger of overpressure because turbines are tabulated to the required work pressure.

That system avoids the pump's cavitation because one of the pipes is connected to the suction pipe used for overfeeding the pump's front chamber with fluid, avoiding in this way the vacuum (this pipe has the same fluid level than the tank). The second pipe sends to the top of the tank the gases produced on the line or on the pump.

NPSH:
Bombadur's pumps don't need a minimum fluid level because they are constantly full of fluid, due to the leveling system and their chambers' design.