BS EN 803:1995 download free.Plastics piping systems Injection-moulded thermoplastics fittings for elastic sealing ring type joints for pressure piping Test method for resistance to a short-term internal pressure without end thrust.
BS EN 803 specifies a method for testing the resistance to internal hydrostatic pressure at 20 °C of any injection-moulded thermoplastics fittings with elastic sealing ring type joints for thermoplastics pressure pipes having a nominal diameter, d, less than or equal to 315 mm, where the joint is not intended to withstand hydrostatic end thrust.
This method is intended for testing fittings over a period of the order of 1 h to 10 h at a pressure which is material-dependent and typically several times the nominal pressure of the fitting.
2 Principle
A specified pressure is applied for a specified period at (20 ± 2) °C to a test piece consisting of the fitting assembled with (an) appropriate pipe(s) by one or more elastic sealing ring type joints and supported in a manner which compensates for end thrust. The test piece is inspected for signs of failure of the fitting.
NOTE It is assumed that the following test parameters are set by the standard making reference to this standard:
a) the test pressure. p. generally expressed as a multiple, not necessarily integer, of the nominal pressure rating of the fitting;
b) the period of time. t. that the test piece is subjected to pressure.
3 Apparatus
3.1 Pressurizing device, including thermostatic and/or environmental controls, capable of maintaining the specified hydrostatic pressure, p (see item a) of the note to clause 2), to within ± 2,5 %, for the specified period of time. t (see item b) of the note to clause 2), and of maintaining the test piece at (20 ± 2) °C.
3.2 Supporting device, to compensate for the end thrust(s) resulting from the application of internal pressure.
3.3 Pressure gauge, capable of checking conformity to the specified test pressure, p (see 3.1).
4 Test piece
The test piece shall comprise an assembly of one or more pipe sections and fittings including at least one fitting of the type to be tested.
Unless otherwise specified in the referring standard, the section(s) of pipe to be connected shall have a length of three times d with a minimum of 250 mm. They shall be capable of withstanding the test pressure, p, required by the referring standard.
Assembling of the test piece shall be carried out in accordance with the manufacturer’s instructions.
5 Procedure
In any convenient order carry out the following steps.
a) Connect the end of one of the pipe sections of the test piece to the pressurizing device (see 3.1).
b) Close by appropriate means the other end(s) of the test piece.
c) Fill the test piece with water at (20 ± 2) °C, taking care to bleed off all internal air. Wait for at least 20 mm after filling to ensure equalization of temperature to (20 ± 2) °C.
Remove any moisture from the outside surface of the test piece.
Apply hydrostatic pressure progressively in such a way that the test pressure, p. is reached in not less than 30 s and not more than 300 s.
Maintain the test piece environment at (20 ± 2) °C for the specified period, I, or until prior failure occurs.
Maintain the pressure, p, for the specified period, t, checking by means of the pressure gauge that the pressure is within ± 2,5 % and ensuring that no leakage occurs at any area of the test piece unless prior failure occurs.
If any area of the assembly other than a fitting under test shows failure (e.g. failure of another joint or a pipe bursting), start the test again, if necessary using other test piece elements. Maintain the pressure until the assembly has shown constant leaktightness for the period, t, or until the fitting(s) fail(s), whichever occurs first.
Record the results accordingly.
6 Test report
The test report shall include the following information:
a) a reference to this standard and to the referring standard;
b) the size, type and nominal pressure of the fitting and the material from which the fitting is made;
c) the identity of the batch or production run from which the fitting was sampled;
d) the type(s) of pipe(s) connected to the fitting in the test assembly and the material(s) from which the pipe(s) is (are) made:
e) the test pressure, p, in bars’
1) the period of time, t, in hours, the test piece was
subjected to pressure;
g) the test temperature, in degrees Celsius; h) whether or not the fitting andlor its joints exhibited any signs of deterioration, leakage, fracture or any other form of failure as specified by the referring standard;
i) jf applicable, observations of any failures causing repetition of the test;
j) any factors which may have affected the results, such as any incidents or any operating details not specified in this standard;
k) the date of test.