Iii the satisfactory completion of the system test

(iii) The satisfactory completion of the system test shall be the ultimate criteria for acceptance
of the completed pipe system by the Superintending Officer. Nothing shall relieve the
Contractor of his responsibility in this regard, and practical completion shall not be deemed
achieved until the Superintending Officer is entirely satisfied as to the water tightness of the
completed system.
6.1.9 Handling of HDPE pipes
(a) HDPE pipes should be handled following recommended procedures. Avoid dragging over
rough surfaces or sharp objects. When HDPE pipes are delivered to site in loose form, either
loose straight lengths or coils, unloading can be done manually using timber skids and ropes or
leather sling. Bundles of HDPE pipes should be moved by forklift. HDPE pipes loose lengths
are to be stacked in pyramidal manner and the stack should not exceed a height of one(1) metre.
The bottom layer of pipes should be restrained against lateral movement.
(b) All HDPE fittings should be stored under cover in the manufacturer’s protective wrappings or
cartons until it is required for use.
(c) HDPE pipes bundles should always be stored on site on sufficiently flat ground. The bundles

may be stacked to a maximum height of three (3) metres.
(d) HDPE pipe coils should be stored flat and the number of coils per stack is limited to the
following quantity:
Nominal Diameter (mm) Nos. of coils
20 7
25 6
32 5
50 4
63 3
90 2
110 1
125 1
6.2 Ductile Iron Pipes
6.2.1 Ductile iron pipes shall conform to BS EN 545. The pipes shall be manufactured with push-on
joints of class K9 or class 40 unless otherwise specified. The length of each pipe shall be 6m
unless otherwise specified and shall be supplied complete with gaskets of neoprene rubber or
equivalent. The supply of all ductile iron pipes, fittings and their accessories (except valves) shall
be from the same manufacturer.
6.2.2 All ductile iron fittings shall conform to BS EN 545. Fittings without branches shall be Class
K12 and fittings with branches shall be Class K14. Unless otherwise specified, all fittings are to
be push-on joints complete with gaskets of neoprene rubber or equivalent.
6.2.3 All flanged pipes shall be Class K12 PN 16 and conform to BS EN 545. The dimensions of the
bolt holes shall conform to BS EN 1092 PN 16 Dimensions. The bolts and nuts to be of hot
dipped galvanized steel or grade 304 stainless steel or grade 316 stainless steel c/w washers,
unless otherwise specified. All flanges shall be cast integral or weld-on flanges. Screw-on
flanges are not acceptable.
6.2.4 In the event of pipes being laid in exceptionally aggressive soils, some further form of
protection may be required and will be detailed in the Special Specification. Polyethylene sleeves
complying with BS 6076 for buried ductile iron pipes shall be provided by the contractor. The
sleeve material shall be of good tearing resistance and of minimum thickness of 0.2mm.