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Matters needing attention of middle-opening pump
1. Conditions necessary for start-up Check the following items before starting the machine: 1）Leak check 2）Make sure that there is no leakage in the pump and its pipeline before starting. If there is leakage, especially in the suction pipe, it will reduce the operati...Read more -
Matters needing attention of boiler feed water pump
1. Pump can only run within the specified parameters; 2. Pump conveying medium must not contain air or gas, otherwise it will cause cavitation grinding and even damage parts; 3. Pump can not convey granular medium, otherwise it will reduce the efficiency of pump and the ...Read more -
Matters needing attention of Submersible sewage pump
1. Before use： 1).Check whether there is oil in the oil chamber. 2). Check whether the plug and sealing gasket on the oil chamber are complete. Check whether the plug has tightened the sealing gasket. 3).Check whether the impeller rotates flexibly. 4). Check whether the...Read more -
Introduction to common pump terms (6) – Pump cavitation theory
Cavitation of Pump: Theory and Calculation Overview of cavitation phenomenon The pressure of liquid vaporization is the vaporization pressure of liquid (saturated vapor pressure). The vaporization pressure of liquid is related to temperature. The higher the temperature...Read more -
Introduction to common pump terms (5) – Pump impeller cutting law
Fourth section Variable-diameter operation of vane pump Variable-diameter operation means cutting off part of the original impeller of vane pump on lathe along the outer diameter. After the impeller is cut, the performance of the pump will change according to certain rul...Read more -
Introduction to common pump terms (4) – Pump similarity
law Application of similarity theory of pump 1. When the similar law is applied to the same vane pump running at different speeds, it can be obtained: •Q1/Q2=n1/n2 •H1/H2=(n1/n2)2 •P1/P2=(n1/n2)3 •NPSH1/NPSH2=(n1/n2)2 Example： Existing a pump, the model is SLW50-200B, we need change SLW50-...Read more -
Introduction to common pump terms (3) – specific speed
Specific Speed 1. Specific speed definition The specific speed of water pump is abbreviated as specific speed, which is usually represented by the symbol ns. The specific speed and the rotational speed are two completely different concepts. The specific speed is a comprehensive data calculated ...Read more -
Introduction to common pump terms (2) – efficiency + motor
power speed 1. Effective Power: Also known as output power. It refers to the energy obtained by the liquid flowing through the water pump in a unit time from the water pump . Pe=ρ G Q H/1000 (KW) ρ——Density of liquid delivered by pump（kg/m3） γ——Weight of liquid delivered by pump（N/m3） ...Read more -
Introduction to common pump terms (1) – flow rate + examples
1.Flow–Refers to the volume or weight of the liquid delivered by the water pump per unit time.Expressed by Q, the commonly used units of measurement are m3/h, m3/s or L/s, t/h. 2.Head–It refers to the increased energy of transporting water with unit gravity from the inlet to the outle...Read more
