Pumps and Pump Kits

Pump Technical Information

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Correct Pump Installation is essential for optimum performance.

It is recommended that the pump flow capacity be oversized for the actual flow required. For optimum running of the system the water circulated through the regulating valve should not exceed 10 - 15% of the pump flow. Recirculating too much water can generate heat in the supply tank increasing the cavitation risk.

Frequently Asked Questions

Question: How much should you reduce the pump RPM to achieve a lower flow capacity?

Answer:

		Max R.P. M. allowed
Required R.P. M. = Expected capacity x		Max allowed capacity

Question: What diameter of pulley must I use to achieve the correct pump RPM?

Answer:

				R.P. M. pump
External diameter of the engine / motor pulley	= External diameter of the pump pulley	x		R.P.M. motor/engine

Question: What if I cannot change the engine / motor pulley?

Answer:

					R.P. M. motor
External diameter of the pump pulley	=	External diameter engine / motor pulley	x		Pump R.P.M

Question: If the engine / motor is running at a lower RPM than the maximum pump RPM allowed, what will be the pump flow capacity?

Answer:

					Max. capacity indicated on the label
Attainable maximum capacity	=	Engine / Motor R.P.M.	x		Max R.P.M. indicated on the label

Question: What is the approximate power required to achieve the max. performances allowed?

Answer:

Required electric motor HP

PSI x GPM
1460	=	Electric Motor HP

Required gas engine

PSI x GPM
1460	x	1.30		=	Gas Engine HP

Conditions to prevent pump cavitation: Minimum difference in height HZ (pos/neg) between pump and water level.

The minimum inlet pressure value of the pump is limited by the cavitation phenomenon. Cavitation is the forming of vapor bubbles when the local pressure is below the vapor pressure of the liquid. Bubbles flow together with the liquid and when they reach a higher pressure area, they collide, generating abnormal stresses that are extremely dangerous to the pump components. To avoid the risk of cavitation, it is necessary that the pump installation is correct.