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Consultation : Draft Proposal for Alternative Back-Flow Prevention arrangement for WC Suites

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Question 1.

Please choose from the below list your area of expertise.

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Question 2.

If not consumer and you are happy to provide the details please state the company and address that you work for (Note this is Optional if preferred to be anonymous.)

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Where possible please provide reference to the section of the document or Annex A.
Question 3.

Below is the AUK 1, applied to a WC with relation to product dimensions would you be able to match product with this requirement.

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Question 4.

With regards to WC Suites are you aware of the requirements of WCs within the regulations, please state your accountability against the WC requirement?

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Question 5.

Reference to Section 3

Would you agree that the air gap sufficiently provides protection against back flow.
Please State the reasons for your answer.

Question 6.

The testing is described in Section 3 and reference to Annex A to demonstrate multiple applications of WC suite and the effect of the installation type on backflow prevention.

In your opinion do you believe that testing was adequate to understand the mechanics of the WC suite and individual components.

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Question 7.

Reference to Section 4 Proposed Subgroup Specification for WC Suite Backflow Protection.

Do you agree fundamental protection of the WC is an air gap?

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Question 8.

Based on the arrangement and dimensions listed in section 4.2.3, and considering the illustrations collectively would these be a suitable alternative to the dimension 300mm from the spillover level of the WC pan to the top of the overflow and including the air gap.
Question 9.

Please provide comment on this section referencing the suitability of the overflow protection. 4.2.1 to 4.2.3

Question 10.

Clarification is provided on the warning pipe and overflow relationship. Please provide comment on the overflow requirements and warning level clarifications in section 4.2.4. including the impact of the dimensions.

Question 11.

Clarification is provided on joints in inlet valves in section 4.2.5 please provide comment on the joint explanations provided including impact of this clarification.

Question 12.

It was noted an observation and discovered that there is an amount of air that can become trapped in the spigot area below the seat of the flush valve and the water level in the pan when filled to the spillover of the WC pan. It was a theory put forward that this air becomes compressed during operation of the flush valve and can mix with, and subsequently push category five fluid up into the overflow as the compressed air tries to escape through the easiest path to atmospheric pressure during the flush cycle, which is up through the overflow tube

The section 4.2.6 Internal Overflows Only - This test is required to prevent contamination of the WC cistern from water rising through the overflow when the WC pan is blocked, the WC pan is full to its spillover level, and the WC is flushed. Under these circumstances, water could rise in the overflow.

Please provide comment on the proposed test and the ability to provide protection from contamination of cistern water and the impact of this clarification.

Question 13.

Further clarification details and supporting information are provided in support of the proposal (section 4) in section 7. In your opinion is this clear and are you satisfied that it covers all aspects of the WCs requirements?

Please provide comment on your answer

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Question 14.

Definitions are provided for reference – do you agree with the definitions and please provide comment on any more supporting definitions required.

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Question 15.

The document has been compiled for WCs to be designed and constructed with adequate protection of the WC suite from water to get back into the system it is installed to.

Please provide any general comments in relation to:
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