Single-stage pumps, also called progressive cavity pumps , are indispensable in numerous industries, including oil and gas, food processing, water and wastewater treatment, mining, and the chemical industry. Thanks to their superior design and reliable operation, these pumps can handle highly viscous fluids, suspended solids, and even shear-sensitive liquids.
To ensure optimal and safe operation of these pumps, compliance with international standards and technical requirements is essential. In this article, we discuss important standards and provide tips for selecting and maintaining single-stage pumps.
Table of contents
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Implementation and application of a single pump
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International standards for single-stage pumps
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ISO standards
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API standards
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EHEDG and FDA standards for the food and pharmaceutical industries
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Important points when choosing a pump
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Frame and rotor materials
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Flow rate and working pressure
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Compatibility with liquids
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Maintenance and troubleshooting of a single-stage pump
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biography
1. Introduction and application of the single pump
Single-stage pumps operate on the principle of an eccentric screw pump. They consist of a metal rotor (usually stainless steel) and a rubber (elastomer) stator, which continuously and pulsation-free pumps fluid as the rotor rotates.
The main applications of mono pumps:
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Transport of viscous liquids such as oil, asphalt and syrup.
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Pumping sludge and wastewater to mining and wastewater treatment plants
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Transport of food products such as dough , sauces and milk in the food industry
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Injection of chemicals into industrial processes
2. International Standard for Single Pumps
To ensure the quality, safety, and efficiency of monopumps, various standards have been established. The most important are:
a) ISO standards (International Organization for Standardization)
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ISO 15136-1 : Progressing cavity pumps for the petroleum and natural gas industries.
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ISO 2858 : Standards for dimensions and performance of centrifugal pumps, some of which also apply to single-head pumps.
b) API standards (American Petroleum Institute)
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API 676 : Standard for positive displacement pumps (including single-stage pumps) for use in the petroleum, natural gas and petrochemical industries.
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Determine material requirements, performance tests and operating conditions.
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c) EHEDG and FDA standards for the food and pharmaceutical industries
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EHEDG ( European Hygienic Engineering and Design Group) : Hygienic design standard for pumps used in the food industry.
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FDA : Approved for use in elastomer materials for pump parts intended for food contact.
3. Important points when choosing a pump
Choosing the right pump directly impacts its lifespan and efficiency. Important factors to consider when selecting:
a) Housing and rotor materials
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Housing : cast iron, stainless steel (SS316) or carbon steel.
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Rotor : hardened or stainless steel.
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Stator : NBR, EPDM or Viton rubber (fluid compatible).
b) Flow rate and working pressure
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Pump capacity (flow rate in cubic meters per hour or gallons per minute).
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Working pressure (bar or psi).
c) Compatibility with liquids
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Viscosity of liquids (thicker liquids require pumps with longer strokes).
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There are abrasive particles (like clay) present that can damage the stator.
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Corrosion of liquids (selection of acid and alkali resistant materials).
4. Maintenance and troubleshooting of a pump
To avoid premature failure, please note the following points:
a) Regular inspection
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Check the stator and rotor for wear.
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Check the bearing lubrication.
b) General symptoms of failure
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The pump flow is reduced : The stator may be worn.
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Unusual vibration : The rotor may be damaged or the bearing may be broken.
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Fluid leak : Check container and seals.
c) Repair and replacement of parts
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Replace the stator immediately (every 6 months or 2 years, depending on the fluid type).
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Use genuine parts to extend the life of your pump.
5. Summary and conclusion
Monoblock pumps play an important role in this field due to their flexibility in pumping a wide range of fluids. However, ISO, API, and EHEDG standards must be adhered to during design and selection. Furthermore, regular maintenance and timely troubleshooting can reduce repair costs and improve system efficiency.
If you are planning to purchase or replace a single pump, be sure to consult a technician to select the option that best meets your needs.
Do you use mono pumps in your industry? Share your comments and questions with us!