BS EN ISO 4671:2007 pdf free.Rubber and plasticshoses and hose assemblies — Methodsof measurement of thedimensions of hosesand the lengths of hose assemblies.
BS EN ISO 4671 This International Standard specifies methods of measuring the inside diameter, outside diameter (includingdiameter over reinforcement of hydraulic hoses), wall thickness, concentricity and lining and cover thicknessof hoses, methods of measurement and identification of the lengths of hoses and hose assemblies, and amethod of verifying the through-bore of hydraulic hose assemblies.
The following referenced documents are indispensable for the application of this document.For datedreferences, only the edition cited applies. For undated references， the latest edition of the referenceddocument (including any amendments) applies.
ISO 463,Geometrical Product Specifications (GPS)- Dimensional measuring equipment — Design andmetrological characteristics of mechanical dial gauges
ISO 3599,Vernier callipers reading to 0,1 and 0,05 mmISO 3611,Micrometer callipers for external measurement
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 bemade at a minimum distance of 25 mm from the end of the hose.
For inside diameters less than 150 mm and for all sizes of collapsible hose， plug gauges with 0.25 mmincrements 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 hosebore is not precisely circular.
For inside diameters less than 63 mm, where greater accuracy is required, for example for wire-reinforcedhydraulic hoses,an expanding ball or telescopic gauge may be used.
For all inside diameters up to and including 100 mm, the internal jaws of vernier slide callipers complying withthe requirements of ISO 3599 may be used. Make two measurements at right angles to each other and taketheir average as the inside diameter. Take care not to distort the hose when making the measurementsCallipers of suitable size may be used for nominal bores above 100 when greater accuracy than is obtainableby Method 5 (see 4.6) is required.
For all inside diameters, an internal calliper dial gauge (see ISO 463) with rounded feet designed for use inbores made of elastomeric material may be used, a calliper size being chosen which is suitabie for the insidediameter to be measured.Make two measurements at right angles to each other and take their average as theinside diameter.BS EN ISO 4671 pdf download.