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Siphonic Drainage Specificationr 1.02
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SPECIFICATION FOR SIPHONIC ROOF DRAINAGE SYSTEMS . . SIPHONIC SYSTEMS,
GUTTERS AND PIPEWORK TO THE REQUIREMENTS OF BS 8490:2007. . . 1R10/.
SCOPE OF WORKS:. . -. Drawing ref: {}. . Description: {}. . R10/22. SIPHONIC ROOF
DRAINAGE SYSTEMS TO BS8490:2007. . -. Drawing references: {}. . -. Manufacturer: To be
tendered (Must be a member of the Siphonic Roof Drainage Association). . -. The system must
be designed within the following parameters to operate on siphonic principles so as to be
regularly self-cleansing in normal use.. . -. Pipework must remain airtight at maximum and
minimum operating pressures. . Pipework and fittings: High Density PolyEthylene to DIN
8074/8075/16963 or BS EN 1519.. HDPE Pipework must be SDR 26 regardless of grade of
HDPE. (for pipework to be used in systems with a maximum negative pressure of 4.5m, PN 3.2
pipework with lower SDR ration can be used.). Alternative/Supplementary pipe materials {
Delete if not to be used}. Cast Iron to BSEN877. Stainless Steel to BSEN1124. Galvanized steel
pipe to EN 1123. . -. Pipework must accommodate thermal movement by using a rigid fixing
system (see manufactures literature for details). Pipework shall be transversely braced at
maximum 15m to prevent pipework sway.. . -. Design rate of rainfall for siphonic system: {
Enter RI } l/(s.m2)*. *(As BSEN12056, Appendix NB, {Enter building life and factor of
safety}).. -. The gravity underground drainage system must be designed to accommodate the
maximum peak flow from the siphonic system, or allow excess water to discharge from open
manhole covers with no back up pressure to the siphonic system. Maximum available capacity of
below ground drainage in litres/second: {}. Maximum design water depth during design rainfall
of 2 minutes duration: To be designed to keep water depth on roof to acceptable limits. Overflow
arrangements: Each roof area to be fitted with at least one emergency overflow pipe discharging
in a conspicuous location outside the building . Minimum siphonic flow velocity: 1.0 m/second..
. -. Maximum pressure imbalance between outlets: 1m. . -. Minimum operational pressure: 8.8m
vacuum for HDPE pipework, 7.8m vacuum for all other materials.. . -. System fill time (priming
time) must be determined in accordance with BS 8490:2007. Calculations must be undertaken
using software accredited by a third party, showing velocities, pressure values and sizes of each
component and fitting. The system should be balanced such that any residual head at any of the
outlets is as a maximum -0m/+1m. (ie the outlet is able to take slightly too much water). Gutter
designs should be carried out to the requirements of BSEN12056-3:2000, using water depths at
the outlet based on third party accredited physical test data.. Butt jointing of pipework on site is
prohibited, unless this takes place at ground level, using a hydraulically operated butt fusion
machine.. . . INSTALLATION. . 3. R10/555. BEFORE COMMENCING WORK specified in
this section, it must be ensured that:. . -. Below ground drainage is ready to receive rainwater or
that the discharge can be dispersed by approved means to prevent damage or disfigurement of
the building fabric.. . . 4. R10/66666. INSTALLATION GENERALLY:. The installation should
avoid all existing services. The contractor will be responsible for carrying out a survey of
conflicting services and roof area/gutter before detailed design commences.. . -. Install
pipework/outlets to ensure the complete discharge of rainwater from the building without
leaking.. . -. Avoid contact between dissimilar metals and other materials, which would result in
electrolytic corrosion.. . -. Adequately protect pipework/gutters from damage and distortion
during construction. Fit purpose made temporary caps to prevent ingress of debris. Fit all access
covers, cleaning eyes and blanking plates as the work proceeds.. . -. Where not specified
otherwise use plated, sherardized, galvanized or nonferrous fastenings, suitable for the purpose
and background, and compatible with the material being fixed.. . 5R10/55. BUILDERS WORK:
Comply with restrictions on the cutting of holes, chases, notches, etc. and methods of attachment
to the building fabric specified in local or national guidelines.. . 6. RAINWATER OUTLETS:
Ensure that:. . -. Outlets are securely fixed before connecting pipework.. . -. Junctions between
outlets and pipework can accommodate all movement in the structure and pipework.. .
7R10/88888888888887. SIPHONIC DRAINAGE PIPEWORK:. . -. Fix pipework neatly,
securely and adequately to prevent movement during extreme operating conditions including
oscillating pressure and vibration.. . -. Fix pipes with the specified number of joints, bends and
offsets, exactly in accordance with the manufacturers drawings.. . -. All pipework is to be fully
accessible for repair or replacement unless specified or shown otherwise.. . -. Provide additional
supports as necessary to support junctions and changes in direction.. . -. Completed pipelines to
be of smooth, consistent bore, clean and free from distortion, wrinkling, cracks and other
defects.. . 8. R10/1010. COATED PIPEWORK/GUTTERS: Make good to coatings after cutting
and any other damage or re-coat, as recommended by the manufacturer.. . 9. R10/20.
IDENTIFICATION OF INTERNAL RAINWATER PIPEWORK: To BS 1710 using selfadhesive bands or identification clips located at junctions, at both sides of each slab, bulkhead
and wall penetration, and elsewhere as directed.. . R10/10. TESTING GENERALLY:. . -. Inform
CA sufficiently in advance to give him a reasonable opportunity to observe tests.. . -. Check that
all sections of installation are free from obstruction and debris before testing.. . -. Provide clean
water, assistance and apparatus for testing as required.. . -. Carry out tests as specified. After
testing, locate and remedy all defects without delay and retest as instructed.. . -. Keep a record of
all tests and provide a copy of each to the CA.. . 11. R10/13. INTERNAL PIPEWORK TEST:. .
-. Temporarily seal open ends of pipework with plugs.. . -. Connect a U tube water gauge and air
pump via a plug.. . -. Pump air into pipework until gauge registers 38 mm.. . -. Allow a period for
temperature stabilization, after which the pressure of 38 mm is to be maintained without loss for
not less than 5 minutes.. . R10/12. GUTTER TEST: Block all outlets, fill gutters to overflow
level and after 5 minutes closely inspect for leakage.. . R10/13. IMMEDIATELY BEFORE
HANDOVER:. . -. Remove construction rubbish and debris from all roofs and gutters. Where
possible, sweep and remove fine dust, which may enter rainwater systems. Do not sweep or flush
dust or debris into the rainwater system.. . -. Remove swarf, debris and temporary caps from the
entire rainwater installation.. . -. Ensure that all access covers, outlet gratings, etc. are secured
complete with all fixings.. . . . . .
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