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Laboratories and similar scientific facilities are considered to be a fluid category 5 risk, requiring fluid category 5 backflow protection.
In addition to point of use backflow protection, zone and wholesite protection may also be required.
Taps in laboratories
Point of use backflow protection can be provided in various ways including:
Type AUK3 tap gap:
A Type AUK3 tap gap may be accepted as point of use backflow protection. Unless it is considered the tap gap may be compromised, where this is the case an alternative form of backflow protection must be provided.
The tap gap is considered likely to be compromised where: -
If laboratory taps can accommodate hoses, two separate aspects are considered:
Where a Type AUK3 tap gap cannot be maintained between the hose discharge point and the spill-over level of the sink/ receptacle alternative fluid category 5 backflow protection must be installed upstream of the tap.
Alternative backflow protection will be required where laboratory equipment, process or experiment is directly connected to the tap, even if a Type AUK3 tap gap can be maintained between the final discharge point and spillover level. The level of backflow protection will be determined by the level of risk associated with the equipment, chemicals/materials and/or processes involved.
Type DC arrangement:
A Type DC arrangement installed on a laboratory tap may be accepted as a means of point-of use fluid category 5 backflow protection providing:
The outlet, including the outlet of any hose attached: -
Only Type DC arrangements which satisfy these requirements will be acceptable. If these conditions are not maintained the water undertaker reserves the right to require the installation of alternative means of backflow protection.
Type DC arrangements are permitted to be used on outlets in fume cupboards which are handling chemicals. But are not suitable for outlets in biological safety cabinets or microbiological safety cabinets (biosafety cabinets) used with materials contaminated with pathogens which require a defined biosafety level. Water outlets in biosafety cabinets should be fed via a Type AA, AB or AD air gap.
For further information please refer to the advice booklet for schools, colleges and higher education establishments or contact the local water undertaker.
Uncontrolled if downloaded. This is informative, non-statutory guidance and intended for general guidance purposes only; it is subject to change.
Compliance with this information should not be relied upon as guaranteeing no enforcement action will be taken by water undertakers. Water Regs UK accepts no liability for loss, indirect or consequential loss arising from or in connection with this guidance document.