Flowserve SIHI vacuum technology
Flowserve SIHI Vacuum Pumps
Industrial vacuum pumps and engineered vacuum systems for demanding process applications.
Process Containment Solutions (PCS) is an Authorised Flowserve Distributor within South Africa. The Flowserve SIHI portfolio includes dry screw vacuum pumps, vacuum booster technology, liquid ring pumps and compressors, and pre-engineered vacuum systems. PCS can assist with technical product enquiries and selection considerations based on operating duty, process conditions and equipment requirements.
Vacuum pump technologies
Explore the Flowserve SIHI vacuum pump range
Different vacuum technologies are suited to different operating conditions and process requirements.
The Flowserve SIHI portfolio includes individual vacuum pumps, booster technology and engineered vacuum systems. Required vacuum levels, gas characteristics and system requirements influence the most appropriate equipment selection.
Dry Screw Vacuum Pumps
SIHI dry screw vacuum pumps operate without oil or service liquid in the pumping chamber. They are designed for processes requiring dry vacuum generation, with equipment suitability dependent on gas characteristics, operating conditions and the required vacuum duty.
SIHI Boost Vacuum Technology
SIHI Boost technology supports applications requiring high pumping capacity at deeper vacuum levels. Booster arrangements are evaluated as part of the overall vacuum system, including the backing pump and specified operating conditions.
Liquid Ring Vacuum Pumps and Compressors
Flowserve SIHI liquid ring technology uses a service liquid to create the pumping action. The portfolio includes single-stage and two-stage vacuum pumps, as well as liquid ring compressors for specified gas and vapour duties.
Pre-engineered Vacuum Systems
Flowserve SIHI Modular D and X systems combine liquid ring vacuum equipment with supporting system components. Service-liquid arrangements and system configurations are selected according to the application requirements.
Flowserve SIHI Vacuum Pump Product Portfolio
Refer to the official manufacturer catalogue for detailed information on vacuum technologies, product families, available models and published performance data.
Vacuum technology comparison
Liquid ring and dry screw vacuum technology
Flowserve SIHI offers different vacuum technologies to accommodate varying process requirements. Liquid ring and dry screw pumps use different operating principles, with important implications for service-liquid requirements, gas handling and system integration.
Liquid Ring Vacuum Pumps
An eccentrically mounted impeller rotates inside a casing containing service liquid. Rotation forms a liquid ring, creating changing chamber volumes that draw in, compress and discharge gas.
Liquid ring technology can be considered for applications involving wet gases and condensable vapours, provided the selected pump, materials and service-liquid conditions are suitable for the process.
Selection considerations: Required vacuum level, gas composition, service-liquid type and temperature, material compatibility and liquid separation arrangements.
Dry Screw Vacuum Pumps
SIHI dry screw vacuum pumps use rotating screw elements to convey and compress gas without introducing oil or service liquid into the pumping chamber.
This technology can be considered for applications requiring dry vacuum generation. Suitability still depends on the process gas, operating temperature, required vacuum level and potential liquid or particulate carryover.
Selection considerations: Required absolute inlet pressure, gas characteristics, contamination requirements, operating temperature and the wider vacuum-system arrangement.
Required vacuum level, suction capacity, gas composition, process conditions and system requirements should guide technology selection. Final equipment suitability must be checked against the applicable Flowserve manufacturer performance data.
Application requirements
What matters in industrial vacuum service
Vacuum equipment should be selected according to the required duty and process conditions, not simply the pump technology.
Flowserve SIHI liquid ring, dry screw and booster technologies have different operating characteristics and system requirements. Establishing the relevant process information helps identify which equipment should be evaluated against the required duty.
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Required vacuum level and capacity
The required absolute inlet pressure and gas flow at the specified operating conditions are fundamental to equipment selection. Changes in operating duty and any proposed booster arrangement should also be considered when defining the vacuum system.
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Gas and vapour characteristics
Gas composition, temperature, condensable vapours and potential liquid or particulate carryover can influence vacuum technology suitability. These conditions should be assessed against the selected equipment's operating requirements.
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Service-liquid and utility requirements
Liquid ring pumps require suitable service-liquid conditions and an appropriate supply or circulation arrangement. Dry screw pumps operate without service liquid in the pumping chamber but may still require cooling and other utilities. Requirements vary by equipment and system configuration.
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Process compatibility and system integration
Construction materials, chemical compatibility, discharge conditions, separation equipment and plant interfaces influence the overall system arrangement. The complete vacuum installation should be considered alongside the individual pump.
Industries & applications
Where Flowserve SIHI vacuum technology is used
Industrial vacuum requirements vary with the process, operating conditions and required performance.
Flowserve SIHI vacuum technologies support a range of industrial duties. The appropriate pump or system must be selected according to the process medium, vacuum requirement and installation conditions.
Chemical and Petrochemical Processing
Vacuum equipment supports processes involving distillation, evaporation and solvent recovery. Gas composition, condensable vapours, operating temperature and material compatibility influence equipment selection.
Distillation · Evaporation · Solvent recovery
Pharmaceutical, Food and Beverage
Vacuum technology is used in selected drying, degassing and sterilisation duties. The process medium, contamination-control requirements and operating conditions influence the choice of vacuum equipment.
Drying · Degassing · Sterilisation
Manufacturing and Semiconductor Processes
Selected coating, load-lock and central vacuum applications require equipment matched to their operating pressures, evacuation cycles and process conditions. These demands influence pump technology and system configuration.
Coating · Load-lock evacuation · Central vacuum
Power Generation and Environmental Applications
Vacuum systems are used in selected condenser exhaust, water-treatment and vapour recovery duties. Suction capacity, gas characteristics, operating conditions and plant interfaces should be considered during selection.
Condenser exhaust · Water treatment · Vapour recovery
Spares & repair support
Flowserve SIHI vacuum pump spares and repair assessment
Effective maintenance decisions begin with an understanding of equipment condition, operating history and the required duty.
PCS is an Approved Flowserve pump and mechanical seal repairer. For Flowserve SIHI vacuum pump enquiries, equipment identification, operating history and component requirements help establish the appropriate technical assessment and whether repair should be considered.
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Inspection and condition assessment
Equipment condition, reported symptoms, operating history and available failure evidence help establish what further inspection or technical assessment may be required.
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Spare-parts identification
Component enquiries should include the equipment model, serial number and available part references. These details support component identification and enquiries regarding compatibility and availability.
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Repair or replacement considerations
Repair feasibility depends on equipment condition, the extent of damage, component availability, technical requirements and lifecycle cost. Replacement may be more appropriate where repair is not technically or commercially justified.
Technical selection guidance
Selecting the appropriate Flowserve SIHI vacuum pump
Vacuum equipment selection should begin with the process requirement, not simply the pump model.
Required vacuum level, gas flow, process conditions and system arrangement influence which Flowserve SIHI technologies should be considered. The final pump or system configuration must be evaluated against the intended operating duty.
Preparing a technical enquiry?
Where available, provide the relevant process information and equipment documentation. Useful details include:
- Required vacuum level, gas flow and available duty specifications.
- Gas composition, operating conditions and applicable process requirements.
- Existing equipment model, serial number and operating history, where relevant.
Six factors to establish before selection
These considerations help define the vacuum duty and identify the manufacturer performance data needed to assess equipment and system suitability.
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Vacuum level and gas flow
Required absolute suction pressure and gas flow at the specified operating conditions.
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Gas and vapour characteristics
Gas composition, temperature, condensable content and potential liquid or particulate carryover.
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Utilities and service liquid
Available cooling, power supply and other utilities. For liquid ring equipment, service-liquid type, temperature and supply arrangement.
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Material compatibility
Chemical characteristics of the process medium, corrosion considerations and relevant construction material requirements.
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Operating profile
Continuous or intermittent operation, expected cycles and changes in process conditions or vacuum demand.
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System and installation
Discharge conditions, separation and cooling arrangements where applicable, plant interfaces and installation requirements.
Flowserve SIHI Vacuum Pump Product Portfolio
Review the May 2026 Flowserve catalogue for SIHI vacuum technologies, product families, model options and published performance information.
Technical consultation
Discuss your Flowserve SIHI vacuum pump requirements with PCS
Selecting new vacuum equipment or assessing an existing installation? Start with the application and operating requirements.
Process Containment Solutions (PCS) is an Authorised Flowserve Distributor within South Africa. PCS can assist with Flowserve SIHI product selection enquiries and technical requirements. For existing equipment, operating history and condition information can help establish the appropriate next steps.
Connect with the PCS technical team
Whether you are evaluating a new Flowserve SIHI vacuum pump or system, considering replacement equipment, or enquiring about an existing unit, share the available equipment and process information for review.
- Application and required vacuum duty.
- Required suction pressure, gas flow, gas composition and operating conditions.
- Existing pump model, serial number and operating history, where applicable.