![]() Pumps or suction pipes with a vertical shaft should not be arranged in series, since swirling of water at the first bell mouth entry may disturb the function of the others, An arrangement, where the water flows perpendicular to the centre line of the bell mouth entry is more favourable. G = 9.81 m/sec 2 gravitational acceleration.ĭ t is the maximum diameter of the bell mouth entry but at least h = 0.3 m. V = is velocity of water in the suction pipe (m/s) The difference between the lowest possible water level in the pump well and the inlet part of the suction pipe, can be calculated as follows: A pump well of bigger size may promote swirling of water. The size of the pump well should be ten times the water discharge/min. The inlet pipe of smaller pumps can be furnished with an inlet rose head for protection. The pump well for the inlet pipe should be furnished with a grid of 20 mm mesh in case of smaller pumps, and with a grid of 20-50 mm mesh in case of pumps with capacity higher than 1 000 l/sec. Obstacles to the operation of the pump should be removed, such as branches, sand, pebbles, etc. revolution control of the pumps (Figure 7 a). The general arrangement of these two types are shown in Figures 1 and 3.įor the water supply to hatcheries, recirculation systems and central pumping stations of fish farms, pumps to catch subsurface water are used as shown in Figure 4.Ī pressure intensifier device inserted into the water supply system compensates for lack of pressure, which can be done by: ![]() The construction of these two types are largely the same. pumping from subsurface water (soil water, deep seated spring, cavern water, spring water, marginal water, etc.) as shown on Figure 2.įor the water supply to fish ponds the first two types are the most commonly used. pumping from surface water (river, canal, lake, reservoir, etc.) Pumping stations for obtaining water from a water source have two types depending on the source: Pumping stations for the first two functions are generally of 2-20 m lifting capacity. for pumping water into a supply system, elevated water tank or water tower for lifting water (high quantity, low pressure) from a well pumping water from a water source such as a river Pumping stations can be grouped as follows:
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