Horizontal and Vertical Centrifugal Pumps Comparison

Posted on 6/1/2011 at 5:09 AM - Link

Centrifugal pumps  are one of the most common pumps onto the market. This model of pump  is greatly efficient at shifting fluid again a thick range of  pressures and flows. The alone difference between horizontal and vertical  centrifugal pumps is shape. The choice between consuming a  horizontal centrifugal pump or a vertical centrifugal pump is  habitually based onto convenience.A  horizontal centrifugal pump is one whose shaft is in horizontal  position and  a vertical centrifugal pump is one whose shaft is in  vertical position; it is always an overhang and of radial-split case  type design.

Several  applications exist for vertical and horizontal  centrifugal pumps. They are recruited in the biotechnology, food  and drug industries to dub a few. They are accustomed in water  handling entries, such as irrigation and drainage. Centrifugal pumps  are accustomed via chemical corporations to transportation lean,  slightly infected liquids. This breed of pump can also be accustomed  for the distribution of plastic fertilizers and bilge pumping in  boats.

The  pros and cons of a horizontal over a vertical design, and vice-versa,  are:

Pros of horizontal  centrifugal pump:

• It is simpler to install, inspect, perpetuate, and service because its rotor and internals are simply accessible.
• It can be coupled directly to a range of drivers encompassing electrical engine, engine, and turbine (steam, gas or power recovery      hydraulic turbine.)
• It can be provided in either overhang plan for low suction pressure service, or in between-bearing plan for high suction pressure service.n.
• It can be provided in various nozzle configuration to streamline, or suit the external site piping. The nozzle configuration can be of end suction lid discharge, lid suction lid discharge, or side      suction side discharge.
• Its low headroom qualification produces it eligible for majority indoor installations.

Cons of  horizontal centrifugal pump:

• It has limited applications where the NPSHR exceeds the site NPSHA; usually an auxiliary booster pump is required. (With a steep lineshaft pump, the NPSHA can be boosted by lowering the setting of      its impeller.
• Its maximum allowable operating temperature and laboring pressure are generally cheaper than that of vertical      centrifugal pump.
• It requires a increased footprint.

Benefits of Plastic lined pumps

Posted on 5/18/2011 at 3:54 AM - Link

Over the years, Sealless pumps, a type of chemical pump, have witnessed a striking growth to ensure advanced improvements in the operational safety and consistent performance. Chemical and Pharmaceutical industries are increasingly gaining benefits by using plastic lined pumps for pumping highly toxic and corrosive media.

Whether it is centrifugal pumps or self–priming pumps, typically a chemical pump for corrosive liquids is subject to strict standards when it comes to safety, leaks to the atmosphere and service life. These high requirements are the reasons for the trend towards sealless in particularly, magnetic drive pumps.

Plastic lined pumps are progressively gaining popularity in applications that present demanding conditions where leakage to the environment is absolutely not acceptable. Numerous factors play crucial role in final selection of lining material to maintain consistent performance and durability. Several factors like degree of corrosion resistance, temperature capability, resistance to permeation and abrasion resistance are considered while selection of lining material. Variety of lining materials are available that can cater to specific requirements and applications. Amongst all the lining material, PFA/PTFE is considered as the preferred choice when corrosion resistance and temperature capability are top priorities.

Along with initial cost and installation of the unit, the mag drive pumps reduce the expenses by lowering costs in maintenance, cleanup and downtime.

The plastic lined mag drive pumps consist of a pressure containing metal outer shell which is generally ductile iron is covered internally by a 1/8 to 3/16 inch plastic coating of internal wetted parts and it provides corrosion resistance. This outer shell also gives structural rigidity to uphold the pump internal pressure and loads of external nozzle.

Every single wetted component is either covered by a fiber reinforced solid plastic liner or made of engineered ceramics, like silicon carbide for the product lubricated bearings.

Heavy Duty PFA/PTFE plastic lined magnetic drive pumps has economically become preferred choice pumps when their costs are compared to the pumps with metallurgies.