IRRIGATION SYSTEMS - TECHNICAL SPECIFICATIONS VOLUME III
C. Resins shall comply with the relevant provisions of BS 3532 Type B, unless
otherwise approved by the Engineer. Vinylester resins shall have an elongation at
break of 3 to 6%.
D. Glass shall comply with the relevant provisions of the following standards unless
otherwise approved by the Engineer. Surface tissues shall also comply with one of
the following standards.
1. BS EN 14020-1, BS EN 14020-2 and BS EN 14020-3 for roving.
2. BS 3396 for woven fabric.
3. BS EN 14118-1, BS EN 14118-2 and BS EN 14118-3 for chopped strand mat.
E. All glass shall be corrosion resistant glass, unless otherwise approved by the
Engineer.
F. Roving size shall not exceed 2400 Tex.
G. Chopped strand mat shall not exceed 450g/m2.
H. Sand aggregate used for non-slip surfaces on benching shall be clean graded silica
sand, nominal size 2mm.
9.2.5.2 Preformed GRP Lining.
A. All linings shall be designed to protect the concrete for a period of at least 60
years. They shall be keyed and bonded into the concrete at the time of
concrete casting. They shall be designed to withstand a back pressure of 2
bars without deflection.
B. Lining shall be composed of a minimum 1.5 mm thick inner layer (layer in
contact with liquid) and a minimum 5.5 mm structural layer as follows:
1. The inner layer shall comprise one layer of glass surface veil 30g/m2 and two
layers of chopped strand mat 300 g/m2, “Advantix” powder bound corrosion
resistance or equivalent approved, impregnated with Vinylester resin of
approved type. Resin to glass ratio shall be 70% to 30% by weight with a
tolerance of ± 5%. Fillers and aggregates shall not be used.
2. The structural layer shall comprise six layers of chopped strand mat
450 g/m2, “Advantix” powder bound corrosion resistance or equivalent
approved, impregnated with is phthalic resin of approved type and 0.5 mm
flow coat on the external surface with Vinylester resin of approved type.
Resin to glass ratio shall be 70% to 30% by weight with a tolerance of ± 5%.
Fillers and aggregates shall not be used.
3. Overall properties of the lining shall be as given in Table 9.2-4 below.
Table 9.2-4: GRP Lining Properties
Property Test Method Value
Axial tensile strength ISO 527-2 100 N/mm2
Water absorption maximum ASTM D570 0.15% not short term boiling method
Barcol hardness ASTM D2583 Min 35 prior to dispatch
4. Lining shall have bonding lugs consisting of 100mm long GRP strips or GRP
round studs bonded to the concrete, adjacent to the face of each GRP panel.
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DIVISION 03-SECTION 03600 FIRST EDITION -DECEMBER 2016
