BS 5504-4:1990 pdf free.Wall hung WC pan – Part4:Specification for wall hung WC pans for use with 7.5 L maximum flush capacity cisterns.
BS 5504-4 specifies material, quality, performance and functional dimensions (other than connecting dimensions) for wall hung washdown WC pans designed for use with independent or close-coupled cisterns complying with BS 7357 having a flush capacity of 7.5 L maximum.
NOTE The titles of the publications referred to in this standard are listed on the inside back cover.
3 Material and quality
Wall hung WC pans shall be manufactured from vitreous china complying with BS 3402.
4 Design and construction
Wall hung WC pans shall be of one piece construction and shall comply with the functional dimensions given in Table 1 as indicated in Figure 1 and Figure 2. WC pans shall comply with the fixing and connecting dimensions given in BS 5504-1 or BS 5504-2 as appropriate.
5 Flushing requirements
When fitted with a 7.5 L maximum flush capacity cistern complying with BS 7357 at high level, low level or close-coupled and tested as described in Appendix A , a WC pan shall meet the following requirements.
a) Paper and ball tests
The trap shall be completely cleared in four out of five operations.
b) Sawdust test
The total unflushed area between the water surface and the underside of the rim or for rimless pans between the water surface and up to a distance of 85 mm from the top surface of the bowl shall be not more than 5 000 mm2.
A.5 Methods and results
A.5.1 Paper test
For each flush operation drop 12 separate sheets of paper as specified in A.21, loosely crumpled, individually, into the WC pan and flush the cistern within 20 s of the start of the operation. Perform the procedure five times ensuring the trap is completely cleared before each new flush operation.
A.5.2 Result
Record whether or not any paper remains in the trap at the end of each flush operation.
A.5.3 Ball test
For each flush operation place the ball into the WC pan and then flush the pan. Perform the procedure five times ensuring the trap is cleared before each new flush operation.BS 5504-4 pdf download.