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fixture unit : ウィキペディア英語版
fixture unit

In plumbing, a Fixture Unit (FU) is equal to one cubic foot of water drained in an 1 1/4 pipe over one minute. A Fixture Unit is not a flow rate unit but a design factor. One cubic foot of water is roughly 7.48 gallons ( 6.25 Imperial Gallons) A Fixture Unit is used in plumbing design for both water supply and waste water.
Different fixtures have different flow requirements. In order to determine the required size of pipe, an arbitrary unit is used for pipe sizing which takes into account the likelihood that all the fixtures will not be used at the same time. This is called "fixture unit" (FU). The relationship between gallons per minute (gpm) and fixture unit is not constant, but varies with the number of fixture units. For example, 1000 FU is equivalent to 220 gpm, but 2000 FU is not double that, but is only 1.5 times as much, or 330 gpm.
Fixture unit values can be determined using charts from the International Plumbing Code or similar codes in local jurisdictions.
There are situations where a design provides for more FUs being discharged than being supplied. This occurs in situations where liquids may infiltrate or are added to a draining system, such as might happen in a large sports venue. Examples of how this could occur include rain water infiltration.



抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「fixture unit」の詳細全文を読む



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