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The pump housing isolates the pumped fluid medium from the atmosphere to prevent leakage and maintain pressure. For centrifugal pumps, the requirements for the pump casing are relatively high. For example, the sealing of the pump casing should be good, and the pump casing should have sufficient strength and rigidity. The flow channels of the pump body and the pump cover should be kept clean after casting. Each type of pump housing is designed according to the application requirements. It can meet the application environment of the pump. As a foundry of pump housings, we have cast many different pump housing types. This article will cover the types of lower pump housings.
Positive displacement pumps surround a rotating or reciprocating displacement element (eg one or more pistons). The inlet and outlet are used to direct the pumped fluid in and out of the pump housing. It is usually divided into suction nozzles and discharge nozzles according to their functions. They can be directly connected to the system piping by means of flanges, pipe joints, and welding. It can also be done in the following two ways. Their pump housing types are different too.
Shell pump: The suction nozzle is immersed in the open liquid supply pool and tank. An example is a vertical shell pump with an axial propeller.
Invasive pumps: Two nozzles are immersed in the fluid along with the entire pump housing. Such as immersion submersibles, and sewage pumps.
Each type of pump will have a different pump housing type. The shape of the pump housing is related to the specific speed. Shells of different shapes can be divided into the following types.
1) Volute-shaped housing. The shell of this shape can be divided into single volute and double volute. The double volute structure consists of two volutes offset by 180° to balance radial forces.
2) Vortex housing (vortex volute). The cross-section of the vortex casing is clearly asymmetrical on the meridian plane, reference can be made to the volute pump with mixed flow impeller and vortex volute.
3) Ring housing (ring housing). The circumference of the annular casing has a constant cross-sectional area. Which can be referred to as a double-suction annular casing pump.
4) Elbow housing. Elbow housing input flow is discharged into the elbow (housing) through a diffuser, see Elbow Housing Pumps.
The pressure range also has an effect on the pump housing. So, the design of some pump casings will be designed according to the pressure of the conveyed fluid.
Housings for low-pressure pumps need different housing designs than those used for high- and ultra-high-pressure pumps. Increasing the pressure rating requires increasing the wall thickness of the pump casing. But, the dimensions of the pump housing must follow international codes and standards.
For high-pressure volute pumps and multi-stage high-pressure pumps, their housing geometry is designed as cylindrical (barrel core pump), conical or spherical (circulating pump). Such as a barrel boiler feed pump. Circulation pump with spherical casing.
Although the internal pressure of the pump is higher. But these designs cut stress on the pump casing. Also, it can be adapted to the manufacturing method used in the production of thick-walled parts.
A vertical barrel pump is a different type of pump than a barrel-type core pump or barrel-type casing pump. Its suction characteristics make it widely used in condensate pumps or refinery pumps. The suction of the pump is enclosed by its outer barrel.
Sometimes the disassembly and structure of the pump is also a reference factor in the design of the pump casing. According to these reference factors, the pump casing can be designed in both radial and axial split configurations with respect to the shaft. For example, the radially split vertical volute casing pump and the axially split horizontal double-suction (volute casing) pump are designed for pipelines.
The shape of the casing of the pump is also designed according to the position of the nozzle of the pump. for example1 In-line pump with nozzles arranged opposite each other.2 Refinery pump with “jack in jack out” orifice.3 Volute casing pumps with axial inlet pipe (end suction).
The housing parts of the segmental pump are named according to their function. Such as suction casing, interstage casing and discharge casing. Examples are segment pumps with product lubricated bearings and segment boiler feed pumps.
When the segmented pump is assembled, the tight connection of the casing is ensured by connecting bolts/through rods. Gaskets and O-rings are mostly passed between the shells. Or resist internal pressure with direct metal-to-metal sealing.
The main manufacturing methods of the pump casing include casting, forging, welding, stamping, and cold drawing. Casting is the most common method of manufacturing pump housings.
The safe operation of the pump depends largely on the durability of the pump housing. Many industry-specific pumps have incompatible pump housing materials and specifications. In some cases the wall thickness of the pump is also specified.
Our common pump casting method can use many metals as materials. Including cast iron, ductile iron, cast steel, martensitic stainless steel, austenitic stainless steel. Also includes duplex stainless steels for highly corrosion-resistant materials (eg desalination applications).
The pump housing of a high-flow single-stage vertical pump is usually made of concrete. For example, shell pumps for low-lift pumping stations. As shown in the figure used for low-lift pumping stations. Concrete volute cooling water pump for oversized volute pumps. As shown.
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The split pump can be divided into various types of pump casings.
For example, in the case of a horizontal pump, the casing of the pump is composed of upper and lower parts. The upper part of the pump housing has a simpler design. The lower part contains the pump inlet and outlet ports and pump feet. For example, a double-suction split volute pump.
The split pump casings are connected by flanges in the upper and lower casing halves. This flange extends over the entire pump housing. Includes two sealed stuffing boxes and is fastened (sealed) by many bolts. This withstands operating pressure and prevents leaks.
In addition to the housing types described above. The pump housing also sometimes includes a heat shield or cooling jacket, which is usually closed by a special cooling cover. Likewise, the pump housing sometimes includes a heating or insulating jacket. Their function is to keep the pumped medium at a certain temperature in the pump housing. Where the pump is not running by means of uninterrupted heating/insulation. To prevent it from precipitation, solidification or crystallization. For example, standard chemical pumps with heating jackets on the suction and discharge sides.
For all types of pump housings, we can produce them. We can customize the pump housing according to the parameters and material requirements. If you do not know how to choose the material of the pump housing, we will also provide you with the best solution.
Vietnam Cast Iron (VIC) provides OEM pump casting parts (housing/impeller/mounting bracket) for various pump applications. From the water pump, fire pump, centrifugal pump to the sewage pump, we have especially facility to offer pump casting parts for all. Our cast iron pump casting is featured by anti-corrosion, strength overpressures, and durability over time.
The pump housing is such a significant part, working to protect the inner rotor of a pump. Especially, among materials, cast iron pump casing is pretty preferable due to its excellent advantages.
VIC is one of the leading OEM pump casting parts. Our casting pump parts are exported oversees from American to European continents.
With respect to cast iron pump casting house, we are able to manufacture various styles and designs according to customers’ drawings and requirements.
Applied advanced molding technologies, machined by skillful workers, and supervised by technical experts, all of our cast iron pump casting products are guaranteed to have corrosion resistance, strength, and durability over time.
Check our casting pump category below to see our pump casting ability. Contact us for your OEM casting pump order and get a quote for each product.
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Either small or big sizes, all of the pumps primarily serve to move fluids (waters, gases, etc.) from inlet to outlet by boosting its pressures.
The pump housing is casting enclosed the inner parts of a pump. This component is very important because it works to protect the inside of the pump to atmosphere to prevent leakage and retain pressure.
Taking an example of centrifugal pumps, the casting housings surround the rotor which transmits energy to the fluid handled via the impeller mounted on the rotating shaft.
With respect to positive replacement pumps, the casings surround the rotary or reciprocating displacement elements.
Especially with the submersible pump, the casing part is required has to be sturdy enough.
The pump housing is a very important part of the pump. Proper casting housing contributes to the pump’s performance and durability. Therefore it should be chosen carefully from material to the manufacturing process.
There are some of the core requirements needed in a pump casing.
Firstly, the most imperative is that a pump house has to guarantee corrosion resistance. Because the pump mainly deals with the fluid transmission, the casting material for the pump case must be able to withstand corrosion.
Secondly, the pump body part also needs to be sturdy enough to bear up against pressures and stresses imposed when the pump works.
Thirdly, the diameter of a pump housing also needs to be large enough to enclose the inner machine rotor parts with enough clearance for installation and efficient operation.
Among pump housing materials, cast iron is often trusted by the manufacturer to produce the case part as it meets these above requirements.
Cast iron features physical and medical characteristics that suitable for pump housing manufacture.
Corrosion Resistance: The gradual increase in temperature makes the liquid to turn more corrosive. Cast iron material maintains feature as an anti-corrosion casting metal. This property supports pumps to work more effectively and durable overtimes. Cast iron pump housing is especially preferable for high-temperature applications.
Strength: As mention above, the pump case is required hard enough to withstand pressures. And cast iron pump housing has demonstrated pretty strong and has the ability to bear stresses.
Casting-ability: Cast iron material has good casting-ability. It is able to cast almost any shapes and designs with good surface finishes. This property allows for casting different pump housing applications.
Durability: Cast iron material is very durable over time, therefore cast iron pump casing is also long-lasting. They require replacement and maintenance less often than other materials.
At Vietnam Cast Iron, we manufacture cast iron pump housing by green sand casting technology.
Green sand casting is one of the first and popular methods used in mold sand technology and often applied in metal casting foundries. This molding method is characterized by using green sand as the main material to create the sand mold for the casting.
Green sand casting method is often used in metalworking foundries due to its outstanding advantages. Below lists some of the major advantages of casting pump housing by the green sand method.
VIC is the leading cast metal manufacturer in Vietnam. Our company can supply various products (OEM) according to the customers’ drawings and requirements.
All of our products are processed by skillful workers, high technologies, and technical expert supervision. There are numerous projects we have carried out and gained high appreciations from our partners.
With respect to pump equipment, we are able to produce cast iron pump housing for different applications. From water pump, fire pump, centrifugal pump to a sewage pump, we have especially facility to cast casing parts for all.
Our cast iron pump cases are featured by:
We don’t work for short term profits, we work to build the long term strategic partnerships with our partners and affirm the brand of VIC. Therefore, all of our products are manufactured with a sprit that quality is our priority.
An order with VIC will save you money upfront and long term. Call us today to find out how we can make your project exceptional.
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