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Quality control of raw materials for monopumps

December 3, 2025
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Single-stage     screw pumps     are indispensable equipment in the oil and gas, petrochemical, food, pharmaceutical, and oil refining industries. Their special design allows them to pump liquids     of varying viscosities, including solid particles, corrosive, and sensitive media  . However, their optimal performance and service life depend significantly on the quality     of the raw materials used  .

If the quality of the raw materials used in pump production does not meet standards, even the most complex machining and assembly processes cannot guarantee the proper and stable   operation    of the system. Therefore,  raw material quality control is   the first and most important step in pump production.

The importance of raw material quality control for monopumps

  1. Extend the lifespan of the pump

  2. Reducing maintenance costs

    • Inferior raw materials lead to frequent breakdowns and increase customer service costs.

  3. Compliance with international standards

    • Sensitive industries (food, pharmaceuticals and oil) only accept equipment made from raw materials that meet international standards.

  4. Operational safety

    • The use of standard materials prevents sudden component failure under extreme operating conditions.

Tapflo screw pumps

The most important raw material for the production of monopumps

1. Dizziness

  • They are usually made of stainless steel, alloy steel or hard-coated steel.

  • Requires     a higher surface hardness     to resist wear.

  • It should have good resistance to corrosion from chemical liquids.

2. Stator

  • They are made from     elastomers such as NBR, EPDM, FKM and silicone  .

  • The choice of elastomer depends on the type of fluid and the operating temperature.

  • The quality of the elastomer’s chemical composition determines its ability to resist swelling, hardening, and breakage.

3. Shafts and bearings

  • Usually made of alloy steel or stainless steel.

  • Hardness and fatigue tests require high accuracy.

4. Mechanical seal

  • It is made from a mixture of materials such as silicon carbide, carbon, tungsten carbide and fluorinated rubber     .

  • The quality of the raw materials plays an important role in preventing leaks and extending the lifespan of the pump.

5. Residential areas and surroundings

  • Made from carbon steel, stainless steel or wrought iron.

  • Mechanical strength and resistance to internal pressure are required.

Raw material quality control process for a pump

1. Certification Control of Materials (CCM)

  • Examination of  documents from raw material manufacturing plants.

  • The chemical composition and mechanical properties comply with the required standards (ASTM, DIN, ISO).

2. Chemical Experiments

  • Spectroscopy:     precise determination of the chemical composition of minerals.

  • Chromatography or FTIR spectroscopy:    identification    of elastomer components. 

3. Mechanical tests

  • Tensile tests check the maximum strength and elongation.

  • Hardness testing to check surface hardness  .

  • Impact test to assess resistance to low temperatures.

4. Physical testing of synthetic rubber

  • Beach hardness measurement A/D  .

  • Testing of swelling resistance  upon  contact with certain liquids.

  • Heat resistance and accelerated aging tests.

5. Corrosion test

  • Testing the coating ‘s resistance to salt spray.

  • Stress testing of corrosion-resistant alloys.

6. Non-destructive testing (NDT)

  • UT (Ultrasonic Testing):     Detection of internal   cracks and cavities.

  • RT (Radiographic Testing):     Verification of the homogeneity of castings and welds.

  • Dye penetration test (PT):     Detects even the smallest cracks in the surface.

Problems with raw material quality control for a pump

  • Differences in material quality on the market:     Not all raw material producers     offer the same quality.

  • Detection of counterfeit elastomers:     Some manufacturers use inferior or recycled elastomers.

  • High testing costs:      Precise tests such as FTIR or  X-ray diffraction  are time-consuming and expensive.

  • Required experience:     Interpreting test results requires specialist knowledge.

Advantages of implementing strict quality control of raw materials

  1. Reduces the risk of failure under extreme operating conditions.

  2. Strengthen consumer confidence in     the manufacturer’s brand  .

  3. Extends the service life of individual pumps and reduces operating costs.

  4. Fully complies with international standards and key customer requirements.

Checklist for raw material quality for single sample pumps

  • ✅Obtain and verify the MTC certificate from the supplier.

  • ✅Conducting spectroscopic investigations of minerals.

  • ✅Performing hardness and tensile strength tests on steel parts.

  • ✅Ground testing of elastomers is underway.

  • ✅Chemical resistance tests for liquids.

  • ✅Non-destructive testing for crack detection.

  • ✅All results are recorded and archived in the quality control system.

Finally

The raw materials form the basis for the quality of the mono-pump.     Without the use of standard steel alloys, durable synthetic rubber, and high-quality mechanical seals, even the most modern manufacturing processes cannot guarantee long-term pump performance.

Therefore, the quality of raw materials must   be strictly controlled     from procurement     to the start of production. Professional manufacturers employ chemical, mechanical, physical, and non-destructive testing methods  to ensure material quality.

Strict adherence to these control measures not only increases the lifespan and efficiency of individual pumps, but     also reduces maintenance costs and unexpected breakdowns, and strengthens customer confidence in the manufacturer’s brand.