Skip to main content

Centrifugal Pump



A centrifugal pump converts rotational energy, from a motor, to
energy in a moving fluid. A portion of the energy goes into kinetic energy of the fluid. Fluid enters axially through eye of the casing, is caught up in the impeller blades, and is whirled tangentially and radially outward until it leaves through all circumferential parts of the impeller into the diffuser part of the casing.

The fluid gains both velocity and pressure while passing through the impeller. The doughnut-shaped diffuser or scroll section of the casing decelerates the flow and further increase the pressure. Fluid under pressure now leaves the impeller producing a drop in pressure behind it at the eye of the impeller. This causes fluid from the suction pipe to flow into pump due to atmospheric pressure and subsequently that fluid also gets discharged. This way fluid in the pump acts like a piston moving outwards and causing drop
in the pressure behind.

 THAT IS WHY A CENTRIFUGAL PUMP CAN BE STARTED WITH DISCHARGE VALVE SHUT AND ALSO IT DOES NOT NEED A RELIEF VALVE BECAUSE IF THERE IS NO DISCHARGE FLOW OF LIQUID THE PRESSURE WILL NOT DROP BEHIND AND IT WILL NOT DRAW ANY MORE WATER. SAME WATER WILL KEEP ON
CHURNING INSIDE THE PUMP.

However, if initially there is no liquid at the eye of impeller there will be no pumping action. Centrifugal pump therefore is not a self priming pump. If the level of water is below the eye of impeller, the pump will require priming.
Labels:

Comments

  1. Fred wilson18 December 2022 at 17:09

    Your quest is over if you're seeking for the best Submersible pump retailer. This team has excellent customer service and communication skills. Additionally, you may use our Paid/Free Add Boost Option to promote your company or website.

    ReplyDelete
  2. Gen29 November 2024 at 06:40

    Great explanation of how centrifugal pumps work! I’ve used Salvatore Robuschi pumps in the past, and they really shine when it comes to efficiency and reliability. They’ve been a great choice for handling fluids in various industrial settings. It's fascinating how rotational energy gets converted so smoothly!

    ReplyDelete

Post a Comment

Popular posts from this blog

Difference Between A, B & C-Class Divisions?

IMO Symbol A Class Division  IMO Symbol B Class Division  SOLAS has tables for structural fire protection requirement of bulkheads and decks. The requirements depend on the spaces in question and are different for passenger ships and cargo ships. The Administration has required a test of a prototype bulkhead or deck in accordance with the Fire Test Procedures Code to ensure that it meets the above requirements for integrity and temperature rise. Types of Divisions: "A" Class "B" Class "C" Class "A" Class: "A" class divisions are those divisions formed by bulkheads and decks which comply with the following criteria: They are constructed of steel or equivalent material They are suitably stiffened They are constructed as to be capable of preventing the passage of smoke and flame to the end of the one-hour standard fire test. they are insulated with approved non-combustible materials such that the average tempera...
14 comments
Read more

Bilge Injection Valve

Bilge Injection is a valve that enables the engine room bilges to be pumped out directly overboard in the event of an emergency such as flooding. The valve is normally fitted to the end of a branch connection with the main sea water suction line. This enables large main seawater cooling pumps to be used as a bilge pump in an emergency. Emergencies like fire and flooding involve the use of seawater. If there is a fire, seawater is the biggest resource of water available in the sea. Similarly, if it involves flooding of the engine room, cargo spaces or any other place on the ship for that matter; you would again require pumping the sea water out of the ship. In both these cases, you require pumps.  There are two valves in close proximity namely main injection valve and bilge injection valve. Both of them have their own independent controls. The diameter of the bilge injection valve is kept nearly 66% of the main valve diameter which draws water directly from the sea th...
Post a Comment
Read more

Load Line & Why it is Important

Merchant ships have a marking on their hull know as the Plimsoll line or the Plimsoll mark, which indicates the limit until which ships can be loaded with enough cargo, internationally, the Plimsoll line on a ship is officially referred to as the international load line. Every type of ship has a different level of floating and the Plimsoll line on a ship generally varies from one vessel to another.  All vessels of 24 meters and more are required to have this Load line marking at the centre position of the length of summer load water line. There are two types of Load line markings:- Standard Load Line marking – This is applicable to all types of vessels. Timber Load Line Markings – This is applicable to vessels carrying timber cargo. These marks shall be punched on the surface of the hull making it visible even if the ship side paint fades out. The marks shall again be painted with white or yellow colour on a dark background/black on a light background.  ...
15 comments
Read more