Stainless Steel Pump Cover Casting

The Stainless Steel Pump Cover Casting is a critical structural component designed to enclose and protect pump internals while ensuring optimal fluid flow and mechanical support. Manufactured via investment casting or sand casting processes using 304 (UNS S30400), 316 (UNS S31600), or high-strength duplex alloys, these covers undergo rigorous quality control to meet standards like ASTM A351 and ASME B16.5.

Engineered with reinforced ribs and flanged connections, the covers provide robust mounting for shafts, bearings, and seals, while their smooth internal surfaces minimize hydraulic resistance and facilitate easy maintenance.

This is a pump cover with symmetrical structure.

It has strict requirements in geometric tolerance to make sure it can be matched up with pump body casting.

We control the casting production and machining process to ensure the accuracy of dimension requirements.

Structural Integrity: Cast from low-carbon stainless steels with controlled dendritic structure, offering tensile strength ≥ 515 MPa (304) or ≥ 620 MPa (duplex 2205), capable of withstanding pressure ratings up to 100 bar (1,450 PSI).

Flow-Optimized Design: CFD-analyzed internal contours reduce turbulence and pressure drop, with polished surfaces (Ra ≤ 3.2μm) in critical flow paths to enhance pump efficiency by up to 10%.

Corrosion Resistance: Alloy selection matches application environments—316 for chloride exposure, 904L (UNS N08904) for strong acids, and duplex for high-temperature/pressure seawater systems.

Precision Machining: Post-casting CNC machining ensures tight flange flatness (≤ 0.05mm/m) and bore tolerances (H7), eliminating alignment issues and reducing seal leakage risks.

The pump casing covers are assembled together with the pump casing castings,impellers and other pump parts to form a complete working system.

It’s the necessary part in almost all kinds of pumps,such as centrifugal pumps,plunger pumps,piston pumps,vacuum pumps,submersible pumps,slurry pumps,screw pumps,peristaltic pumps.

This kind of pump casing covers are widely applied in water treatment industry, food equipment industry, Oil and Gas industry, agricultural industry,construction industry, and shipbuilding industry,etc.

Industrial Pumps: Used as casing covers in centrifugal, reciprocating, and diaphragm pumps for chemical processing, where resistance to sulfuric acid, caustics, or amine solutions is essential.

Marine & Offshore: Deployed in seawater cooling pumps and bilge systems, with duplex stainless steel covers resisting pitting from chloride ions (≥ 30,000 ppm) and biofouling.

Water Treatment: Installed in reverse osmosis (RO) pumps and desalination systems, ensuring compatibility with chlorinated water and high-pressure operational conditions.

Power Generation: Integral to boiler feed pumps and condensate extraction pumps, with 316H (UNS S31609) covers capable of handling temperatures up to 450°C (842°F) in steam cycles.

Q: What is the difference between investment casting and sand casting for pump covers?

A: Investment casting offers higher dimensional accuracy (±0.1mm) and smoother surfaces for complex geometries, while sand casting is suitable for larger covers (up to 1,000kg) with simpler designs.

Q: Can these covers be used in high-vacuum applications?

A: Yes—tight machining tolerances and optional stress-relief annealing ensure gas-tight seals, with helium leak testing available for vacuum systems requiring <1x10^-9 mbar·L/s leakage rates.

Q: How are casting defects like porosity addressed?

A: 100% radiographic testing (RT) and pressure testing (1.5x operating pressure) are performed, with defects repaired via TIG welding followed by heat treatment and re-machining.