BS 14055:2010 pdf download – WC and urinal flushing cisterns
1 scope
This European Standard specifies design, performance requirements and the test methods for WC and urinalflushing cisterns with flushing mechanism, inlet valve and overflow.
This document covers flushing cisterns designed to be connected to drinking water installations insidebuildings.
This standard does not cover automatic valveless siphon flushing cisterns for flushing urinals.NOTE Flushing cisterns for one-piece WCs and close-coupled suites are covered by EN 997.
2 Normative references
The following referenced documents are indispensable for the application of this document.For datedreferences,only the edition cited applies. For undated references,the latest edition of the referenceddocument (including any amendments) applies.
EN 997:2003,WC pans and wC suites with integral trap
EN 1717,Protection against pollution of potable water in water installations and general requirements ofdevices to prevent pollution by backflow
EN 13407:2006, Wall-hung urinals — Functional requirements and test methodsEN 14124,Inlet valves for flushing cisterns with internal overflow
BS 1212-2:1990, Float operated valves — Specification for diaphragm type float operated valves (copper alloybody)(excluding floats)
BS 1212-3:1990,Float operated valves — Specification for diaphragm type float operated valves(plasticsbodied) for cold water services only (excluding floats)
BS 1212-4:1991,Float operated valves — Specification for compact type float operated valves for wcflushing cisterns (including floats)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
valve-type flushing cistern
cistern with integral valve outlet device, for storage and discharge of a defined volume of flushing water forremoval of excrement from a wC pan
3.2
valveless-type flushing cistern
cistern with integral syphonic actuated outlet device, for storage and discharge of a defined volume of flushingwater for removal of excrement from a wC pan
NOTE Both types of flushing cisterns are available, as detailed below:
3.3
close-coupled multiple use flushing cistern
close-coupled flushing cistern for use with different WC pans
3.4
independent flushing cistern
flushing cistern mounted separately from a WC pan or urinal
3.5
outlet valve
mechanism for opening and closing the outlet orifice of the flushing cistern
3.6
operating mechanism
mechanism to open, and if applicable, close the outlet valve
3.7
flush pipe
connecting pipe between a flushing cistern’s outlet and a WC’s or urinal’s inlet
3.8
overflow
device enabling release of excess water from a flushing cistern when water reaches a pre-determined level
3.9
inlet valve
valve that controls and shuts off the flow of water into a flushing cistern
3.10
overflow level
water level corresponding to the upper edge of the overflow or to the lower edge of the overflow notch
3.11
maximum water level
highest water level reached after flow stabilisation, in the event of continuous supply, as a result of malfunction of the inlet valve
3.12
critical water level
highest water level in any part of the appliance, 2 s after the supply is cut off
3.13
residual water level
water level after a full flush is completed
3.14
adjustable residual water level
water level in a cistern, after (uninterrupted) flushing, when an outlet mechanism can be adjusted to the elevated residual water level
3.15
meniscus level
level resulting from surface tension of water during overflowing
3.16
nominal water level
water level when a flushing cistern is filled to the nominal flush volume
3.17
nominal flush volume
volume of water indicated, when a flushing cistern is filled to the nominal water level
3.18
flush volume
volume of water discharged from the flushing cistern during a flush cycle
3.19
safety margin
c
distance between the nominal water level determined by the manufacturer and the overflow level
3.20
flush rate
volume of water flowing out of a flushing cistern as a function of time
3.21
test height
distance between the seat of the outlet valve and the horizontal axis of the flush pipe
3.22
impact force
force of the flushing water at the outlet of the flush pipe