Tools for Plumbing Joints
A fine-toothed, a sharp cutting knife, a flat file and some fine wire wool are needed. For fixing pipe clips, a hand drill, screwdriver, and are required.
For jointing pipes of up to 50mm, a spigot and socket-weld method of jointing is used. The socket fittings are designed to provide an efficient and reliable joint and are used in conjunction with a proprietary solvent cement.
The working methods are as follows:
• Cut the pipe to the required length with a fine-toothed hacksaw, ensuring that the spigot end is cut square. Mark the position of the cut, double checking that this is correct, and wrap a piece of paper round the pipe, bringing its edges together on the line of the cut. This template should en sure an accurate square cut.
When cutting, never force the hacksaw. Draw it rhythmically back and forth across the pipe, using only moderate pressure;
• Degrease the mating surfaces of both pipe and fitting with cleaning fluid;
• Slightly chamfer the outer edge of the pipe;
• Roughen the mating surfaces with an abrasive paper or cloth;
• Apply an even coat of cement to the fitting socket and to the pipe: brush with an axial movement and immediately push the fitting on to the pipe. Hold it in position for a few seconds and remove surplus cement. Never dip the pipe into the tin and always apply the cement with a brush;
• Do not disturb the joint for about five minutes and only then handle with care.
Although solvent welded joints achieve setting in minutes, the weld does not reach its full strength until 24 hours after jointing. One hour drying time should be allowed for every 1.055kgf/cm2 (15psi) before testing.
The tin of cement must be closed immediately after use, as the solvent evaporates quickly. It is also highly inflammable, so avoid smoking or the presence of naked flame.
In common with other plastics, PVC has a high rate of thermal expansion. The correct position of pipe brackets to allow for thermal movement is essential. Pipe clips must not be secured immediately adjacent to the fitting, in order to ensure longitudinal movement of the pipe.
Unless each fitting and expansion point is anchored firmly, there can be accumulated movement or escalation, making the installation dimensionally unstable.
In some cases, particularly on horizontal pipe runs, this could lead to the pulling apart of joints. Clips must be carefully aligned to ensure longitudinal freedom.
Pipes must not be rigidly fixed by any form of grouting where they pass through walls or floors. Fittings should not constitute any form of obstruction.
Where pipes pass through walls the use of sleeves is recommended. There should be a minimum air space of 75mm between PVC pipes and high-temperature heating mains.
The recommended number of joints per 0.454kg (1lb) is as follows:
10. November 2011 by admin
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