water industry wis 4-02-06 specification january 2019: …€¦ · wis 4-02-06 january 2019: issue...
TRANSCRIPT
WATER INDUSTRY
SPECIFICATION
Fine to Flush:
WIS 4-02-06 January 2019: Issue 1
(Page 1 of 30)
1 Water Industry Act 1991: Section 117.
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confirm that the product
material does not contain petro chemical derived plastic fibres. The test will
French Standard
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2 A 4.5 litre flush volume toilet has been selected because it:
• Is considered representative of the most commonly used units now being installed in the UK.
3 The WC Bowl Clearance Test may be carried out in conjunction with the Drainline Clearance Test, in which case it shall be connected to a drainline as specified in Appendix B.
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≤
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1005.12
1%
samplecontrolofmassdry
sievemmonretainedmassdrythroughpassedproductofMass
5 This is to encourage the sample material to turn over during the rinsing and, in doing so, exposing any loose fibres to the flow of water. 6
45o
300 mm
Sieve with 12.5 mm round holes
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7 Number of flushes for a single person household per day. Compendium of micro-component statistics. WRc Report Ref: P9193.03: 2012.
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8 Whilst it is accepted that the transport time for a product to progress from a WC flush to treatment works inlet will vary considerably, a time of six hours has been chosen for the test as representative the average time of transit from a property to a wastewater treatment facility. 9 This procedure ensures loose fibres are disengaged from the larger fragments.
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from all eight one litre sub samples
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10 When the tap water is much colder than the laboratory temperature, bubbles can form over the 24 hour test period as the water warms. In this situation, it is highly recommended that the temperature of water in the column and air temperature in the laboratory be allowed to come into equilibrium over 24 hours before starting a test.
2.0
m
Upper timing line
Lower timing line
Floatation line
Drain valve
200mm diameter transparent pipe
Drain valve
0.1 m
0.3 m
1.2 m
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or below the 300 mm
marker line
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