Rubber or plastics hoses -
Determination of volumetric expansion
WARNING: Persons using this standard should be familiar with normal laboratory practice. This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user to establish appropriate safety and health practices and to ensure compliance with any national regulatory conditions.
0 Introduction
When used for dispensing specific volumes of fluids, the volumetric capacity of a hose is often required to vary by only small amounts at the dispensing pressure. This standard describes a method of checking that such requirements can be met.
1 Scope
This standard specifies a method for the determination of the volumetric expansion of rubber or plastics hoses under hydrostatic pressure.
This standard does not specify the dimensions of the test piece and the test pressure(s) as each of which will be specified in the appropriate specification.
2 Normative references
The following standards contain provisions which, through reference in this standard, constitute provisions of this standard. At the time of publication, all editions listed are valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below.
GB/T 5563-1994 Rubber and plastics hoses and hose assemblies - Hydrostatic testing
3 Apparatus
3.1 See Figure 1 for the test apparatus.
The apparatus comprises a suitable source of fluid which can be maintained at the required pressure, together with pressure gauges, piping, valves and fittings, so that a vertical length of hose can be subjected to hydraulic pressure. A graduated burette of sufficient accuracy is also required for measuring the volume of fluid corresponding to the expansion of the hose under pressure.
3.2 The bore of all piping and connections shall be smooth without recesses or off-sets, so that all air may be freely removed from the system before carrying out each test. The valves shall be of such design as to open and close with minimum displacement of fluid. The apparatus shall be capable of increasing the pressure in the test piece in accordance with GB/T 5563. The rate of pressure increase shall be:
a) between 0.075 and 0.175MPa/s for test pressures up to 12.5MPa;
b) between 0.35 and 1.0MPa/s for higher test pressures.
Foreword I
ISO Foreword II
0 Introduction
1 Scope
2 Normative references
3 Apparatus
4 Calibration of apparatus
5 Procedure
6 Expression of results
7 Test report
