Water Tank Terminology Explained
Sectional Tanks are rectangular fixed container assembled from panels for the storage of water at atmospheric pressure and at a maximum temperature of 30oC.
Note: This temperature is higher than is acceptable for drinking water, which should not normally exceed 20oC.
Volume contained in a tank, measured up to the top edge of the side walls.
Volume contained in the tank up to the maximum working level, this can be between 10 and 50% less than the Nominal Capacity.
Structure situated underneath water tanks. It’s purpose is to protect the building from water damage. All water tanks located above areas that are water sensitive should be bunded.
Ball valve housing:
Enclosed chamber containing an access hatch above the level of the cover, permitting the level control mechanism to be mounted at a higher level than would otherwise be possible.
Opening to the atmosphere to allow for the movement of air resulting from changes in the water level so that the water always remains at atmospheric pressure.
Pipe so fixed that it’s outlet, whether inside or outside a building, is in a conspicuous position where the discharge of water can be readily seen.
Pipe connected to the tank to discharge any overflow therefrom.
Construction of one or more panels within a tank which divides the tank into two separate compartments.
Note: In any situation where there is only one water storage tank in a building, it is to be recommend that a weir or a division plate be used. This will facilitate maintenance of the tank without effecting the water supply to the building.
Construction of one or more panels within a tank, which divides the tank but to less than its full depth such that the contents can spill over from one side of the weir to the other.
Construction of one or more panels within a tank, which partially subdivides the tank in order to increase the length of the flowpath between the inlet and the outlet from the tank.
The duration of the test should be a minimum of 24 hours, commencing at least 2 hours after the tank has been filled. The test shall be carried out within 10 days of erection unless the manufacturer agrees to a longer period after assembly. The tank should be inspected at regular intervals and not deserted during commissioning (first filling with water). The leakage test is not carried out by Nicholson Plastics.
B 7491 : Part 3 : 1994:
Glass fibre reinforced plastics cisterns for cold water storage. Part 3 Specification for sectional tanks.
BS 6700: 1997:
Specification for design, installation, testing and maintenance of services supplying water for domestic use within building and their curtilages.
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