NEWS CENTER

Technical Documentation

company news

Company News

Industry News

Technical Knowledge

Common Problem

Video Center

Why Do Slurry Pumps Use Single-Casing and Double-Casing Designs?

Published:

Sep 16,2026

Slurry pumps can be classified, according to their structural design, into single‑casing and double‑casing types, which differ in terms of structural configuration and the arrangement of wetted components. This paper begins with an examination of pump casing structures, briefly outlines the operational characteristics of single‑ and double‑casing designs, and analyzes the key factors that influence casing selection in practical applications, thereby helping readers gain a clearer understanding of the distinctive features and applicable design principles of each casing type.

Why Do Slurry Pumps Use Single-Casing and Double-Casing Designs?

In slurry pump products, we often see Single‑stage pump casing and double‑stage pump casing Two types of structures. Although both can be used for slurry pumping, they differ in terms of structural design and the arrangement of flow‑through components. So, what exactly are the differences between these two pump casings?

Single‑stage pump casing: direct structure

A single‑stage pump casing refers to a design in which the pump body itself directly bears the primary pressure‑bearing and flow‑passing functions, with the slurry in direct contact with the inner surface of the casing. This configuration is relatively straightforward, involves fewer components, and results in a more compact overall structure.

The design of a single‑stage pump casing must be tailored to the specific pump type, materials, and operating conditions, and cannot be categorized based solely on a single set of operating parameters.

Double-layer pump casing: a combination of outer shell and liner.

A double‑walled pump casing features an inner liner installed within the outer casing. Simply put, The outer shell primarily provides structural support, while the inner liner is responsible for contact with the slurry. 。

Since the media conveyed by slurry pumps typically contain solid particles, the double‑walled design allows for the selection of appropriate liner materials based on the specific operating conditions. Consequently, different flow‑path component configurations can be employed to suit varying slurry characteristics and operating conditions.

It should be noted that a double‑casing design does not necessarily confer superior wear resistance; actual performance also depends on the material, slurry characteristics, operating parameters, and the specific structural configuration.

How should you choose between single-layer and double-layer?

There is no simple “better” option between single‑stage and double‑stage pump casings. The actual choice must be made by weighing all relevant factors. Operating pressure, slurry concentration, particle characteristics, pump design, installation conditions, and operating environment and other factors.

For specialized slurry‑pumping equipment, the pump casing is only one component of the entire flow‑path system; only when the pump housing, impeller, and other wetted parts are properly matched to the actual operating conditions can the equipment’s performance requirements be met.