BS EN ISO 3471:2007 pdf free download.Earth-moving machinery – Roll-over protective structures – Laboratory tests and performance requirements.
This International Standard specifies methods of measuring the inside diameter, outside diameter (includin diameter over reinforcement of hydraulic hoses),wall thickness, concentricity and lining and cover thickness of hoses, methods of measurement and identification of the lengths of hoses and hose assemblies, and a method of verifying the through-bore of hydraulic hose assemblies.
2 Normative references
ISO 463,Geometrica Product Specifcations (GPS)-Dimensiona measuring eguipment-Design and metrological characteristics of mechanical dial gauges.
ISO 3599,Vernier callipers reading to 0,1 and 0,0.5 mm.
ISO 3611,Micrometer callipers for external measurement.
4 Measurement of inside diameter
4.1 General
Measurements by methods 1 to 7 may be made either on the ends of a full length of hose or on a test piece (minimum length 150 mm)cut from a full length For wire-reinforced hydraulic hoses, measurements shall be made at a minimum distance of 25 mm from the end of the hose. Measurements shall be made using one of the following methods, as appropriate.
4.2 Method 1
For inside diameters less than 150 mm and for all sizes of collapsible hose, plug gauges with 0, 25 mm increments in diameter (see Figure 1) and tapered gauges with 0, 1 mm increments in diameter(see Figure 2) may be used. Insert the gauge into the hose test piece gently without pressure.Take special care if the hose bore is not precisely circular.