our products

D&Q Mining is a high-tech company integrating R&D, production and sales. It provides mature products and solutions such as crushers, sand making, milling equipment, mobile crushing stations, etc., for aggregate, mining and waste recycling.

centrifugal pump under vacuum

PUMPS DON'T SUCK! And Other Centrifugal Pump Basics

Centrifugal pumps move fluid by using centrifugal force to generate velocity of the liquid. Fluid enters the pump through the suction nozzle, into the eye of the impeller. The impeller vanes catch the fluid and rotate it, both tangentially and radially until it exits the pump on the discharge side.

More

Pumping Under Vacuum Industrial Professionals

Dec 31, 2007· Pumping Under Vacuum posted in Industrial Professionals: Dear all,We need to pump methanol solvent from a distillation tank under vacuum to a storage tank which cannot be vacuumised. Problem is that we cannot increase the suction head by lowering the pump of raising the tank. Is it possible by any other means ? If centrifugal pump is not possible what are the other options available.

More

Pumping out of a vacuum: Will a pump do it? Physics Forums

Dec 11, 2014· A centrifugal pump doesn't work because it cavitates. The hot liq. is only about 10 C under its boiling boint (@100 mmHg) and the NPSH available isn't sufficient. That's my theory. Would a reciprocating pump / dosing pump work better? What other options do I have? I've about 6 ft of total head available from surface of liq. till pump position.

More

NPSHa under vacuum conditions Pump engineering Eng-Tips

Apr 25, 2007· Meeting NPSHr when the source is under vacuum does not really have to be a problem. As you said further down your post sufficient liquid column is one way to overcome the problem as is a low NPSHr pump. There are centrifugal pumps on the market with particularly low NPSH requirements.

More

Centrifugal Pumps Stuffing Box Review Engineers Edge

Pump Knowledge Menu Centrifugal Pumps Suppliers. Centrifugal Pumps Stuffing Box Review. It is not always possible to use a standard centrifugal pumps stuffing box to seal the shaft of a centrifugal pump. The pump suction may be under a vacuum so that outward leakage is impossible or the fluid may be too hot to provide adequate cooling of the packing.

More

Centrifugal pump system tips, do's and dont's

Viscosity is the main criteria which determines whether the application requires a centrifugal pump or a positive displacement pump. Centrifugal pumps can pump viscous fluids however the performance is adversely affected. If your fluid is over 400 cSt (centiStokes) in viscosity consider using a positive displacement pump. see also the pump glossary

More

Centrifugal Pump Parts and functions Mechanicallyinfo

Oct 06, 2018· Centrifugal Pump Parts Lantern Ring: When pump suction is under vacuum (Pump take suction from condenser), external leakage is possible or when the working fluid is excessively hot to provide satisfactory cooling and lubrication to the packing then stuffing box not used. In these conditions, a lantern ring use to provide for cooling of packing.

More

What is Centrifugal Pump Definition

Centrifugal pumps are devices that are used to transport fluids by the conversion of rotational kinetic energy to the hydrodynamic energy of the fluid flow. The rotational energy typically comes from an electric motor or steam turbine (in case of turbine-driven feedwater pumps). Centrifugal pumps are used in more industrial applications than any other kind of pump.

More

US5536147A Vacuum priming system for centrifugal pumps

A self-priming pump system including a vacuum priming unit and a liquid pumping unit, the pumping unit having an engine driven centrifugal pump with an intake conduit, the priming unit having a vacuum column with an internal well chamber and a vacuum

More

Centrifugal Pump Parts and functions Mechanicallyinfo

Oct 06, 2018· Centrifugal Pump Parts Lantern Ring: When pump suction is under vacuum (Pump take suction from condenser), external leakage is possible or when the working fluid is excessively hot

More

PUMPS DON'T SUCK! And Other Centrifugal Pump Basics

Centrifugal pumps move fluid by using centrifugal force to generate velocity of the liquid. Fluid enters the pump through the suction nozzle, into the eye of the impeller. The impeller vanes catch the fluid and rotate it, both tangentially and radially until it exits the pump

More

Characteristics of Centrifugal Pumps Pumps & Systems

Positive displacement pumps have a constant torque characteristic, whereas centrifugal pumps demonstrate variable torque characteristics. This article will discuss only centrifugal pumps. A centrifugal pump

More

Centrifugal Pumps Stuffing Box Review Engineers Edge

Pump Knowledge Menu Centrifugal Pumps Suppliers. Centrifugal Pumps Stuffing Box Review. It is not always possible to use a standard centrifugal pumps stuffing box to seal the shaft of a centrifugal pump. The pump suction may be under a vacuum

More