By Ross C Mackay
This booklet is a realistic account of pumping, piping and seals beginning with fundamentals and supplying specific yet available details on all features of the pumping technique and what can get it wrong with it. Written by means of an stated professional with years of educating adventure within the functional figuring out of pumps and platforms. Aids figuring out of pumps to reduce disasters and time-out. a realistic guide masking the fundamentals of the pumping procedure. Written by way of an stated professional.
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Extra info for The Practical Pumping Handbook
Example text
In the approach used in these examples, it is first necessary to establish the Resistance Coefficient (K factor) of each valve and fitting. This information is contained in the charts for Typical Resistance Coefficients for Valves and Fittings in Chapter 14. The value is then ! 44 . . System Hydraulics multiplied by the Velocity H e a d (from the Friction Loss tables) to provide the Friction Loss for that particular fitting. Consequently, the value of the friction loss for each fitting must be calculated individually.
1 System controls A change in Friction Loss can be caused by a variety of conditions such as manual operation or automated controls opening and closing a different valving system. This will result in the System Curve adopting a different slope that will pivot about its point of origin at zero capacity. 11- System curve for friction realized when the bore of the pipe changes in the discharge side of the pump reduces in size owing to some kind of buildup such as scaling, etc. Such a buildup may also occur inside process equipment such as filters or heat exchangers.
It should only be considered as a last resort, and only with the full design involvement of the pump manufacturer. 2 Install a suction inducer As very few pump manufacturers have suction inducers available, the practical application of this option will be severely limited. Even the few that are available must be approached with caution as they are likely to affect the pump performance at lower flows. 3 Use a double suction impeller As the liquid flows into the impeller through two opposing eyes, a double suction impeller uses approximately 67% of the N P S H that is required by a single suction impeller in an equivalent size.
