An Overview of the Steps & Phases Involved in Pump Impeller Casting

A pump is a device through which fluids are managed by mechanical action. Pumps are used for a variety of purposes. The earlier pump was applied to manage water by the use of watermill and windmill. Today, the uses of the pump are many. It is used for water supply, chemical movement, irrigation, air conditioning systems, flood control, gasoline supply, etc. Before we understand the process of pump impeller casting let us first figure out and understand the two fundamental concepts of pump casting and impeller.

What is Pump Casting?

Pump casting merely is a process where the pump parts are arranged and casted by using different metals. A pump designed in such a way so that it provides greater strength and is corrosion resistant because pump parts deal with liquid substances.

What is Impeller?

An impeller is a part of a pump and is a rotor that rotates at a very high speed producing a sucking force, which in turn increases the fluid’s pressure as well as the flow rate. Various metals are used to make impellers such as iron, steel, brass or bronze, and many times plastics as well.

Steps Involved In Pump Impeller Casting Process.

  • A sand casting process is used to produce the impeller of a pump. The beginning of this process deals with the patterns of manufacturing. Core pipes are manufactured in order to make the hollow sections.
  • After that, moulds are prepared accordingly by using two moulding box namely – core and drag boxes.
  • The cores are made separately using core boxes.
  • The cores that are made are then fixed in the mould to prepare hollow surfaces.
  • The molten metal is poured once the mould is ready.
  • After solidification, the casting is removed. And the removed casting is cleaned by applying some fetching item.

Many different casting methods are used to make the components for pumps. It can be done either by using ferrous casting methods or non-ferrous casting methods.

Ferrous casting method includes – Gray iron casting, Malleable iron casting, and Ductile iron casting. While the non-ferrous casting method uses numerous methods such as Silicon Brass Casting, A356.0 Primary, 356.0 Secondary, Tin Bronze Alloy, and Red Brass Casting.

Pump Impeller sizing

It is necessary that one has basic knowledge of how to measure the pump size. Basically, pump impeller sizing is matching the pump flow rate and pressure with the flow rate and pressure required for the process. In order to achieve the mass flow rate, it is essential that the pump generates a pressure that is high enough to overcome the hydraulic resistance of the system of pipes and valves through which the liquid must travel. And this hydraulic resistance is known as the system head.

There’s no fixed quantity when it comes to system head because the faster the liquid flows, the higher the system head becomes. Pump sizing then is a qualification of the necessary pressure of a rotodynamic pump with a given system head.