Self Priming Pumps – Working and its Use

The self priming pumps are a special form of centrifugal pump that eliminates the necessity for external priming devices. If a centrifugal pump is found on top of the suction vessel or sump , it should be primed before it is started, to get rid of air from the suction line and casing, and to fill the suction line and casing with liquid. This should be done before starting the pump, otherwise the pump won't pump, and the air can harm the pump bearings. The priming operation on a regular centrifugal pump that's operating with a suction lift is done by pulling a vacuum at the top of the pump casing, using a vacuum pump or the plant vacuum systems. A self priming pump eliminates the requirement for this external priming mechanism.

The operating self priming centrifugal pumps work like any other pump that's operating with a suction lift and that has been properly primed. When the pump shut down or stops working, the liquid drains out of the suction line and back to the sump. However, as a result of the special design of the over-sized self priming pump casing, a amount of liquid remains within the bottom of the casing. When the pump is started again, the pump goes through a priming cycle, which generally takes several minutes. Throughout the priming cycle, the liquid that had remained in the pump casing is pushed by the impeller out the discharge, along side some of the air that is in the casing. This creates a vacuum at the impeller inlet, which draws liquid up the suction line. The priming cycle continues till all of the air is pushed out of the discharge and the water has worked its way up the suction line to the impeller. Then, the pump is totally primed and begins pumping like every primed centrifugal pump.

Self priming pumps can be used anywhere where a pump is running with a suction lift. The pump is also costlier than a regular centrifugal pump, however it eliminates the external priming mechanisms, and eliminates any bearings or motors in the sump that other pump types would possibly need. Normally, suction lifts are restricted to approx. twenty feet with self priming pumps.

2:22 AM - Sep. 19, 2011

Safety Measures While Servicing Hot Oil Pumps

Hot oil pumps deliver hot oil through the application of pressure. When one amongst these machines has a fault or breaks down, it must be fixed. It is important that when performing on heavy equipment like this, you follow all the mandatory safety precautions to avoid potential accidents that might result in personal damage.

Whenever you are engaged on any type of machinery, hot oil centrifugal pumps, it is vital that you simply disconnect the machines from the power sources. Additionally, once the power has been shut off, ensure that you just lock it out that way and put a maintenance tag in order that all persons who would possibly turn the switch on will know to check with you and also the maintenance team before touching the switch.

While working on hot oil pumps it is important that you simply have a clean, hazard-free space in which to work. Sadly, things do not always break down in clean, well-swept rooms, therefore you may need to wipe up a mess before you begin performing on the pump. If there is water or oil on the ground, this can be a slipping hazard and a fire and electrical hazard as well. If there are unwanted objects in the way, then you need to move them out of the way in order that you've got unrestricted access to the pump for servicing purposes.

Make sure that you have on all necessary safety protection gear before you begin work. Safety goggles and work gloves are useful protecting gear as are steel-toed boots to avoid foot injuries. Hard hats could also be needed, particularly if you are in an area where you may be subject to falling items.

Keep track of all components and parts when disassembling the hot oil centrifugal pumps. Each part incorporates a purpose and a function, and it should correspond to a chart of the pump that you are working on. If you've left-over components and parts, likelihood is that you forgot to place something back; and if you are attempting to order new components, it always helps to know the correct name of the part you are ordering.

3:34 AM - Sep. 14, 2011