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Section I: Ideal Installations
Pump suction lines   

1. Suction lines should be as short as possible
2. Unrestricted flow
3. Pipe diameters must not be less than the B + L recommendations
4. Filters are essential on capacities less than 100 liters/hour and desirable on large capacities.
5. Where accuracies of + or - 0.5% or better are required, level controls should be fitted to the suction vessel to maintain the liquid level as constant as possible
6. Flooded suction is desirable for normal liquids but for liquids having high viscosities, a good positive suction is essential.

Pump discharge lines

1. Discharge lines should be as short as possible
2. Pipe diameters must not be less than the B+L recommendation.
3. The pumps are of the positive displacement type and relief valves or bursting discs should be fitted if the pressure line can be positively shut off. The motor starters should also be fitted with overload protection to further reduce the possibility of damage to the pump.
4. Discharge pressure must be at least 2m (W.G.) greater than the suction pressure.
5. When fitting a manifold to a multi-head unit, care must be taken to avoid one liquid interfering with another and producing an injector effect.

Section II: Alternate Arrangements

1. Recommended conditions. (Fig. `a`)
2. If the suction pressure is unavoidably higher than the discharge pressure, an auxiliary tank should be fitted at a lower level near the pump suction (Fig `b`) or alternatively, a spring loaded valve fitted in the discharge line (Fig `c`)
3. Injection into a pipeline without the pressure sustaining valve shown can produce an injector effect causing over dosage. (Fig. `d`)
4. A pulsation dampener or break tank fitted near to the pump suction will reduce a pulsing flow.
5. A pulsation dampener fitted immediately after the pump discharge will also reduce a pulsing flow.