Horizontally Split Casing Centrifugal Compressor

SP Series(Medium-Low Pressure, Capable of Handling Ultra-large Flow Rates)

Horizontally split single-shaft centrifugal compressors are suited to medium-low pressure and large-flow process duties. With mature casing arrangement, convenient maintenance access, and broad impeller-size coverage, the SP Series supports reliable continuous operation across petrochemical and general industrial gas services.

SP Series (Medium-Low Pressure) Centrifugal Compressor Overview

Application Scenarios:

Onshore/Offshore Oil and Gas

Petrochemicals

Fertilizers

Olefins

Refining

General Chemicals

Dry Chlorine

Typical Model: 2SP806-B, suitable for instrument air compression

Outlet Pressure: 8 barG

Flow Rate: Approx. 70,000 m³/h

SP Series (Medium-Low Pressure) Centrifugal Compressor Overview

Advantages

Horizontally split casing simplifies maintenance and internal inspection

SP frame range covers medium-low pressure, ultra-large-flow applications

Suitable for process gases requiring stable continuous operation

Broad impeller-diameter platform supports flexible selection by duty point

Applicable across petrochemical, olefin, fertilizer, refining and general chemical services

Planning Space for Inspection and Maintenance

The horizontal casing split provides access to internal components for inspection and maintenance. QualRotate’s selection guidance describes opening this casing arrangement without moving the baseplate or disconnecting process piping.

Discuss maintenance access while the installation layout is being developed. Share the available space, surrounding equipment and piping arrangement, and ask for the access requirements of the proposed configuration to be confirmed. Easy internal access still needs to be supported by a practical site layout.

For packaged installations, the compressor, driver and auxiliary systems also need to be considered together. Our article on compressor skid design explains how these elements are integrated with the supporting frame.

Specification

Technical Parameters of Horizontally Split Casing Centrifugal Compressor

The SP Series is QualRotate's horizontally split centrifugal compressor range, designed for medium- to low-pressure, high-flow applications. The model table provides a general reference for the available frame sizes and flow ranges, while the final configuration is selected according to the specific operating conditions.

For centrifugal compressor selection, please provide the gas composition, flow rate, suction and discharge pressures, and operating temperatures. Information on expected operating variations and part-load requirements will also help us determine a configuration suited to your actual operating conditions.

Site conditions are also considered during selection. Available space, maintenance access, equipment footprint and layout can all influence the final SP configuration.

*When reviewing a centrifugal compressor specification, compare the flow, pressure and speed entries together. The SP table lists maximum flow rate, pressure limit, impeller diameter and design rotational speed by model. These entries support an initial comparison; your enquiry should also identify the operating conditions associated with the required duty.

Use the following points when discussing the table with QualRotate:

Flow: State the required value, unit and reference conditions.

Pressure: Provide both inlet and required outlet pressures, including whether the values are gauge or absolute.

Speed: Identify any driver or operating-speed constraints.

Operating range: Describe expected changes in flow, pressure or gas composition.

Ask the engineering team to confirm how the published model data applies to your stated conditions before finalizing the selection.

For a horizontally split centrifugal compressor enquiry, share the application, gas composition, flow, pressures, temperatures and operating range, including duty cycle and part-load needs. Include site layout, piping interfaces and maintenance access constraints, and specify whether the project involves new equipment, replacement or modification.

For existing units, provide operating data, available performance curves, constraints and intended changes. QualRotate's compressor retrofit service evaluates operating conditions, performance curves and compatibility to assess the proposed scope.