ABS / PVC Pipe Fittings
Derwent Water Services Limited supplies an extensive and comprehensive range of ABS / PVC Pipe fittings.
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General properties of PVC-U Fittings BS range
Rigid PVC fittings are suitable for connecting PVC pressure pipes in the following fields: irrigation, water distribution, chemical plants, water treatment, swimming pools, food processing plants, etc.
Complete dimensional item ranges as per the following series: (L), (R) and (T).
L series: solvent welding BS series (BS 4346/1).
R series: form BS solvent welding to BS 21 parallel threaded (BSP).
T series: from BS solvent welding to metric solvent welding.
Fittings supplied in rigid PVC (polyvinylchloride) unplasticised and stabilized suitable for conveying potable water and food-stuffs. Material chemical resistances according to ISO/TR 10358.
Our PVC compound is not toxic and it is suitable for conveying potable water and food-stuffs in accordance with the prescriptions of National Authorities in Italy (C.M.102 d.t.d. 02.12.78) and in other countries.
Standard gaskets for unions and stubs are in EPDM (ethylene-polypropylene rubber). Other materials are available upon request.
The following dates are referred to water or not particularly aggressive fluids, at a working temperature of 20°C.
COUPLING TOLERANCES FOR SOLVENT WELDING BS SERIES, IN ACCORDANCE WITH:
Fitting complying with:BS 4346/1 Pipes complying with:BS 3505 and BS 3506
PVC-U Fittings & Valves Installation Notes
Solvent Cement Fittings
Solvent Cement Fittings in rigid PVC can be glued on PVC pipes provided that the pipe dimensions comply with ISO 727, UNI 7442/75, DIN 8063, NF T54-027 for metric range and BS 3505-3506 for B solvent cement. A strong dende-type glue is recommended, especially for coupling large diameters where the ovalisation effect may cause a considerable slack. For a perfect sealing, this slack should never exceed 0.6mm with a dense type glue and 0.3mm with a fluid type glue. For a perfect sealing, strictly follow the glue manufacturer’s instructions:
a) Cut the pipe squarely, remove burrs and roughen mating surfaces with a glass paper. Then, using a clean cloth, wipe over with cleaning solvent.
b) Apply an even coating of glue to both socket and spigot.
c) Push spigot into socket immediately (1-2 minutes)
d) Wipe off excess glue.
Leave joint undisturbed for the time required by the glue manufacturer and, in any case, allow 24 hours at normal room temperature (20°C) before applying pressure. Verify the correct alignment of pipe and fitting.
TP threaded fittings in PVC can be screwed to any kind of threaded items provided that they comply with standard specifications as per ISO R7, DIN 2999, UNI 338, BS 21 (cylindric gas range). For a perfect sealing follow these instructions:
a) Wind up the threaded male end completely with a good quality PTFE tape.
b) Press PTFE tape on the threads to ensure a good coupling.