However, Speedfit pipe, being flexible, can run from one fitting to another without having to install a connector in between. Speedfit needs no jointing materials, eliminating the risk of fire from the use of blowlamp, solder and flux. Instructions on the drilling of joists is given in the Building Regulations Approved Document A, and summarised as follows: 1. Holes should be no greater than 0.25 of the depth of the joist. Holes should not be less than 3 diameters (centre to centre) apart.
Holes should be located between 0.25 and 0.4 times the span from the support. Several types of joists are available and Speedfit recommends that specific manufacturers’ details are consulted. However, the following can be used for general guidance. Holes may be located vertically anywhere in the web, but leave 3mm web at the top and/or bottom of hole. Do not cut into joist flanges when cutting the web. If more than one hole is to be cut in the web, the distance between the edges of the holes must be at least twice the diameter of the largest hole. Generally joists are manufactured with 38mm perforated knockouts in the web at approximately 300mm centres along the length of the joist. Unlike I beam joists, pipe can be cabled anywhere within the open web as no drilling is required. However, the top and bottom flanges must not be notched. Avoid damaging the outside diameter of the pipe as you cable through the metal cross web members.
Speedfit is well suited for timber frame construction. Ensure that the structural integrity is not compromised when installing the pipework. If the pipe passes through an external wall, care must be taken not to damage the vapour barrier. The pipe should be installed on the inside of the thermal insulation layer. If this is not possible, the use of conduit should be specified at the design stage. Speedfit is well suited for steel frame construction and care should be taken when installing the pipework. All runs should be installed through preformed holes in the structure and protected by a rubber or plastic grommet. Where clipping of pipework is restricted, cable ties must be used to secure the pipe. As with all installations, make sure that any pipework passing through walls and floors does not affect the fire resistant properties of the structure. Speedfit pipework can be easily cabled through studwork and within wall systems as well as behind “dot and dab” plasterboard installations. Speedfit 10mm B-PEX Barrier pipe is most commonly used to feed radiators. If incorporating fittings in this way, collet covers or collet clips must be used within the Standard (PKM) range of fittings. To prevent surface damage to the plaster caused by expansion and contraction of Speedfit pipes, it is important to ensure that all Speedfit pipework is channelled into the wall and protected with appropriate sleeving. Alternatively, the pipework can be surface mounted and boxed in if required for aesthetic appearance. Speedfit pipe and fittings can be laid in concrete and masonry provided they are installed in conduit pipe with access boxes for the fittings. As stated in Water Regulation Schedule 2.7 and BS8000 : Part 15, fittings and pipe should be removable for possible replacement. Insulation is also recommended to protect against heat loss and the effects of frost. Speedfit Conduit Pipe is supplied in either 15mm or 22mm (internal diameter) sizes. The flexible convoluted pipe has an outside diameter of 24mm and 30mm. On long exposed runs of pipework, the expansion of Speedfit pipe when warm (1% on length between 20°C and 82°C) can cause it to sag between clip fixings. When this is undesirable, pipework can be boxed in or replaced with rigid copper pipe. Speedfit pipe and fittings are stabilised to withstand limited exposure to ultra-violet radiation in sunlight but are not designed for permanent direct exposure. Under such conditions painting or lagging is required.
Pipe and fittings should also be lagged to prevent frost damage. Do not allow Speedfit fittings to come into contact with jointing compounds, cellulose based paints, paint thinners or strippers, solder flux or acid based descalents or aggressive cleaning products, including those below pH4, high in hypochlorite (e.g. (SEE THE DISINFECTION OF HOT AND COLD WATER SYSTEMS section of the installation advice for specifically permitted disinfection procedures). If there is a risk of any chemical treatments coming into contact with Speedfit, please contact the Technical Advisory Service first to check compatibility. JG Speedfit does not recommend that fluxes of any type come into contact with our pipe and fittings.
However, if fluxes are to be used in an environment where Speedfit is installed then we recommend installers use non-acidic and zinc chloride free fluxes such as Fernox Flux. Properly installed, Speedfit pipes are virtually silent in operation and do not resonate; they absorb the acoustic vibrations and pressure waves created by cavitations, water hammer, float operated valve oscillation and other hydraulic effects.