BS 7976 Pendulum |
BS 7976: 1- 3 2002; "The Pendulum Method" describes the specification, operation and calibration of the TRL (Transport Research Laboratory) Pendulum for slip resistance testing.We offer a method for testing using BS 7976 Pendulum.
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The BS 7976 Pendulum slip test forms the basis of our on site slip risk assessment. Originally designed to replicate the actions of a slipping foot, the pendulum skid tester was subsequently adopted extensively for the testing of road surfaces.
BS 7976 has 3 parts, BS 7976-1 describes specification. BS 7976-2 describes preparation of sliders prior to testing, pre-test checks, testing procedure, temperature correction and essential information for reporting. BS 7976-3 describes the calibration method. |
Sliders are prepared in advance of a site visit/test by swinging across a sheet of 400 grade silicon carbide resin bonded paper mounted on a glass plate. Slider edges are further smoothed by swinging across a sheet of wet 3M 261X Imperial Lapping Film Grade 3MIC mounted in a similar manner.
In line with UKSRG guidelines, Grip Potential's calibration procedure sees tests performed on wet 3M 261X Imperial Lapping Film Grade 3MIC of an expected PTV. In addition, tests are conducted on wet float glass and a wet ceramic tile of known PTV. If any result is outside calibration tolerances the preparation process is repeated as necessary. Results for slider/pendulum on site verification tests are recorded for every slip test we conduct. |
Once the pendulum slip tester is assembled, check tested, leveled and zeroed, testing can commence. The pendulum height is adjusted as necessary to ensure a slider contact length of 126±1mm along the floor surface. Tests of the floor surface are conducted parallel, at 45 degrees and perpendicular to the direction of foot traffic in dry and then contaminated conditions. The contaminant is often water, however it is advised that the contaminants likely to be found in normal use are used. In the past we have conducted tests with icing sugar, oil, MDF dust, mayonnaise, cement, flour, soap, ketchup, even chocolate.
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The HSE classify PTV's as follows;
It should be noted that it is not as simple as generating a slip potential from PTV and signing the floor off as a 'low risk of slip'. Many external factors can significantly affect the frictional demands of pedestrians using the surface. For this reason Grip Potential conduct a full, holistic "Slips Potential Model" risk assessment.
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