Why is Vertical Chemical Centrifugal Pump Better?
Horizontal Pump vs. Vertical Pump
Despite their apparent simplicity, centrifugal pumps come in a wide range of types, sizes, shapes, standards, stages, speeds, sealing and other design features, construction materials, orientations, and so on.
Experts benefit from more options because they provide a broader range of options. More options, on the other hand, cause more confusion for beginners because they expand the selection criteria.
One of the most frequently asked questions is whether a horizontal pump is superior to a vertical pump, or how to select the proper type of pump.
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Let's a comparison between horizontal and vertical centrifugal pump
Horizontal pump
Vertical pump
Similarities:
Both pumps use the same basic principle of centrifugal force to move liquids through the impeller and into the discharge pipe.
Both horizontal and vertical pumps can handle similar types of liquids, such as water, oil, and chemicals.
Both types of pumps are available in a range of sizes and materials to meet different performance and durability requirements.
Specific speed options and radial mixed axial flow options are available
Both can have different impeller configurations like open/ semi-open/ Closed.
All sealing methods (Mechanical seal, Packing seal) are available in both the options
Differences:
Design: Horizontal centrifugal pumps have a horizontal shaft and an impeller that rotates within a casing. Vertical centrifugal pumps, on the other hand, have a vertically-oriented shaft and an impeller that is suspended within a casing.
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Space requirements: Horizontal centrifugal pumps are typically larger in size and require more space for installation as compared to vertical centrifugal pumps. Vertical pumps are more compact and occupy less space, making them suitable for applications where space is limited. Eg. offshore Platform
Installation requirements: Horizontal pump installation is more complex than vertical inline pump design. Alignment is necessary among pump, piping, and motor mounting. Vertical pumps are easy to install, being inline design can be simply suspended like a valve in piping works
Flow rate: Horizontal centrifugal pumps can generate higher flow rates than vertical centrifugal pumps. As a result, they are well-suited for large-scale applications requiring high flow rates. Vertical centrifugal pumps, on the other hand, are better suited for applications requiring a low flow rate.
NPSH requirement: NPSH (Net Positive Suction Head) is the amount of pressure required to prevent cavitation in a pump. Horizontal centrifugal pumps typically have a lower NPSH requirement than vertical centrifugal pumps, making them more suitable for applications where the liquid source is low.
Maintenance: Horizontal centrifugal pumps are easier to maintain compared to vertical centrifugal pumps, as they have more accessible parts and require less disassembly.
Drivers types: Horizontal pumps for electric motors, diesel engines, and gearboxes. Vertical pumps good for motor drive
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Horizontal Vs. Vertical Centrifugal Pump
Posted 17 September 2007 - 06:47 AM
This matter of comparing horizontal versus vertical mounted pumps is, in my opinion, one of purely horse sense. As Joe infers, it always breaks down to trade offs. Each version has its niche. However, you should be specific about what TYPE of vertical pumps you are talking about. Deepwell pumps are one thing, but I'll concentrate on the vertical in-line, process pump as the item of discussion for now. I’ve installed and operated both horizontal and vertical versions and the following is just a quick rundown of comparisons:
1. The horizontal is a better accepted standard because of tradition, cost, & availability;
2. There is no perceptible difference in NPSH requirements between both versions; they can both handle equal NPSH situations – if properly selected and installed;
3. Vertical pump orientation demands overhead space for maintenance – especially in the heavier horsepowers, such as 15+ hp; for larger motors you require an overhead rail and hoist. Horizontals are easier to manhandle and lift, shift around.
4. Once you commit to a vertical, you have for all practical purposes increased your investment and inventory in spare parts. Vertical design is very specific as to type of bearings – primarily thrust – and these cause you to have to duplicate inventory for your vertical pumps. You can no longer have the benefit of exchanging motors and couplings with the ease you experience when you standardize on horizontals only.
5. Some vertical designs are really “tight” for space in the coupling distance piece area (in order to reduce overall height and turning moment) and this makes it rough for maintenance and handling seal leakage and maintenance. This used to be a big problem with horizontals as well, until ANSI and API specs were applied.
6. Verticals require special piping design in order to alleviate or eliminate all piping loads due to pump weight – especially in the smaller sizes;
7. Eventually, in some cases, you wind up having to independently supporting the vertical pump with structural steel – a fact that starts to defeat one of the original unique features of having a vertical pump in the first place. I have found that basically ALL pumps should have their own independent support (or foundation) in order to remove and piping stresses and allow the pump to operate with ease and totally independent.
There are more features, but I thought I’d mention a few that come immediately to mind.
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