What is BS 4962 - Specification for plastics pipes and fittings about?
BS 4962 discusses specifications for plastics pipes and fittings for use as subsoil field drains. Plastic pipes and fittings are used in pipe systems to connect straight sections of pipe or tube, adapt to different sizes or shapes, and for other purposes such as regulating (or measuring) fluid flow.
BS 4962 specifies requirements for the construction, dimensions, materials, and performance of plastics pipes of up to 400 mm nominal outside diameter, with or without perforations, and for any associated fittings for normal field drainage. No restrictions are placed on the type of plastics material to be used. Methods of the test, associated guidance and information on quality control testing are given in BS 4962.
Who is BS 4962 - Specification for plastics pipes and fittings for?
BS 4962 on the specification for plastics pipes and fittings is useful for:
- Plastic pipe manufacturers
- Design engineers
- Quality control personnel
Why should you use BS 4962 - Specification for plastics pipes and fittings?
Plastic pipes and fittings are used in plumbing to manipulate the conveyance of water, gas, or liquid waste in domestic or commercial environments, within a system of pipes or tubes. For the purposes of BS 4962, the definitions applied are coilable pipe, design internal diameter, design perforation length, non-coilable pipe and specific tangential end stiffness (STES2 year). The marking remains legible under handling, storage, and installation procedures in accordance with BS 4962 and with BS 5955-6 and BS 8301 as applicable. Marking by indentation to a depth not greater than 0.15 mm is deemed to comply with this clause without infringing any applicable design limits for wall thickness or outside diameter. If the marking is effected by means of printing or labels, it complies with B.1.2 or B.1.3 (as applicable) and B.1.4 of BS 3955:1986 and, as applicable, with BS 4781-1 except that, if the label is to be applied directly to a plastics pipe or fitting, the substrate to be used for the method of test for adhesion comprises a film made of the corresponding plastics material.
A cut length of pipe is placed between two flat parallel horizontal plates and a constant compressive force is applied for a minimum of 1 008 h (42 days). The deflection of the pipe is recorded at specified intervals so as to prepare a plot of pipe deflection against time. The linearity of the data is analysed and used to calculate the extrapolated 2-year deflection, Y2. Y2 is then used in the calculation of the specific tangential end stiffness after 2 years (STES2 year). To provide reference data for inspection testing, the ring stiffness of the pipe is determined using a further set of test pieces taken from the same sample of the pipe like that used for type testing for STES2 year of a pipe conforming to BS 4962. Using BS 4962 you can understand the requirements for the construction, dimensions, materials, and performance of plastics pipes of up to 400 mm nominal outside diameter.
What’s changed since the last update?
BS 4962:1989 supersedes BS 4962:1982. BS 4962:1989 includes some revisional changes with respect to BS 4962:1982. These include:
- The title of the specification has been changed
- The maximum design outside diameter for pipes has been increased from 200 mm to 400 mm
- The scope and requirements have been extended to include unperforated pipes otherwise corresponding to the perforated pipes for use as carrier drains or where systems of perforated pipes are to be linked by unperforated sections, as in the vicinity of tree roots
- Methods for testing pipe in a stretched condition have been detailed, in the introduction of Appendix H
- The severity of the impact test has been increased by doubling the mass of the striker to be used
