PUMPS & PUMP KITS PUMP TECHNICAL INFORMATION 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 How much should you reduce the pump RPM to achieve a lower flow capacity? What diameter of pulley must I use to achieve the correct pump RPM? What if I cannot change the engine / motor pulley? If the engine / motor is running at a lower RPM than the maximum pump RPM allowed, what will be the pump flow capacity? ANSWERS Required RPM = Expected Capacity x Max RPM Allowed Max Allowed Capacity External Diameter of the Engine Motor Pulley External Diameter of the Pump Pulley = External Diameter Engine Motor Pulley Attainable Maximum Capacity = Engine / Motor RPM x = External Diameter of the Pump Pulley x Pump RPM Engine / Motor RPM Engine / Motor RPM Pump RPM x Max Capacity Indicated on Label Max RPM Indicated on Label What is the approximate power required to achieve the maximum performances allowed? Required Electric Motor HP = Electric Motor HP PSI x GPM 1460 Required Gas Engine HP 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. 176 Specifications, product descriptions and product availability subject to change without notice.
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