Информативный текст в коммуникативном обучении профессионально-ориентированному чтению
Доклад - Психология
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rcome all frictional resistance. The practical limit of actual lift in pump operation ranges from 20 to 25 feet, when the water is warm, the height to which it can be lifted decreases due to increased vapor pressure.
(3) The term total column means head plus lift. The static total column is the static lift plus the static head. The height or distance from the level of supply to the level in the tank, in feet, is termed the static total column. The dynamic total column is the dynamic lift plus the dynamic head, or the equivalent total column of water in motion. It represents the pressure resulting from the static total column the resistance to flow caused by friction.
(4) Friction of water in pipes results in loss of pressure and reduced volume of water per minute delivered. Also, friction in the faucets, in the fittings, and in the flow through the meter must be considered.
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