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Pump Guide

Pump Selection Guide

  1. Gather your application data first. Following data is important:

    • Fluid to be pumped and its physical and chemical characteristics
      1. Viscosity
      2. pH value
      3. Specific Gravity
      4. Size of suspended solids, if any
      5. Discharge rate required
      6. Head at which discharge is required
      7. Suction head if any
      8. Pipe line diameter intended/existing and no. of bends
  2. Select the diaphragm, Teryair® offers the following material choices:

    • Neoprene
      1. An excellent general-purpose diaphragm for use in non-aggressive applications such as water-based slurries, well water or sea water. Exhibits excellent flex life and low cost.
      2. Temperature range -18 C to +93 C (0 F to +200 F)
    • Nitrile
      1. Excellent for applications involving petroleum / oil-based fluids such as leaded gasolines, fuel oils, non-synthetic hydraulic oils, kerosene, turpentine and motor oils.
      2. Temperature range -12 C to +82 C (+100 F to +180 F)
    • Viton®
      1. Excellent for use in applications requiring extremely hot temperatures. May also be used with aggressive fluids such as aromatic or chlorinated hydrocarbons and highly aggressive acids. Especially where high suction lift is important.
      2. Temperature range -40 C to +175 C (-40 F to + 350 F)
    • PTFE
      1. Excellent choice when pumping highly aggressive fluids such as aromatic or chlorinated hydrocarbons, acids, caustics, ketones and acetates.
      2. Temperature range +4 C to +104 C (+40 F to +220 F)
    • Santoprene™
      1. Good abrasion resistance. Low cost. Can handle mild acids and alkalis well. Excellent low-cost alternative to PFTE. Excellent suction capabilities Excellent general-purpose diaphragm.
      2. Temperature range -40 C to +107 C (-40 F to +225 F)
    • Hytrel®
      1. Good abrasion resistance. Low cost. Excellent suction capabilities Excellent general-purpose diaphragm.
      2. Temperature range -27 C to +107 C (-40 F to +225 F)
  3. Once the diaphragm material is chosen, select the correct material of construction of the pump. Teryair® offers following material of construction choices:

    • Aluminum
      1. Good for fluids having pH between 5.5 and 8.5 Temperature only limited only by diaphragm limits
    • Stainless Steel 316L
      1. Good for stronger concentrated acids and alkaline fluids. Stainless Steel is durable and rugged.
      2. Temperature only limited by diaphragm limits
    • Polypropylene
      1. Good alternative low-cost choice where fluid is compatible especially chemical compatibility and temperatures.
      2. Polypropylene is good between Temperature ranges of +12 C to +107 C and +32 F to +175 F.
    • Ductile Iron
      1. Ideal for underground and overground rugged duty especially where underground duty calls for a no-aluminum construction. Economic alternative to SS in these cases.
  4. Now establish the TOTAL Head using the below calculation.  

    1. TOTAL Head = Specific gravity X (Suction Head + Discharge head)
    2. Now add roughly about 10 feet for each 90-degree Bend, and allow for friction within the pipe too.
  5. Check Solids Handling Capability

    1. Maximum slurry particle size must not be greater than the pump’s solids passage capability. A strainer may be placed on the inlet line to eliminate particles larger than the pump’s capability.
    2. Please refer to individual specifications for your pump’s specific solids passage capabilities.
  6. Establish Pump Model most suited

    1. Example: To achieve a flow of 120 liters per minute at a head of 120 feet.
    2. If we select DP40 Pump, from its graph we see that this pump will need about 25 cfm of air at about 70 PSI supply pressure.