Standard Test Method for Joint Restraint Products for Use with PVC Pipe

Importancia y uso:

4.1 This test method is useful for establishing any effects that a joint restraint product has on the performance of PVC pressure pipe. This test method is designed so that success in all three parts of the test provides reasonable assurance that a joint restraint product may be used on PVC pipe at the full pressure rating and capacity of the pipe.

4.2 Restrained joint test specimens shall be subjected to internal pressures that are equal to the minimum burst pressure requirements for the pipe alone. The minimum burst pressure requirements for some common dimension ratios are shown in Table 1. The minimum burst pressures for other dimension ratios of pipe produced from 12454 PVC Compound (that is, pipe conforming to Specification D1785) may be determined based on a hoop stress of 6400 psi (44.13 MPa).

(A) The pressures listed approximate a hoop stress of 6400 psi (44.13 MPa). Some minor adjustments have been made to keep the test pressures uniform in order to simplify testing.

4.3 Testing of restrained joint test specimens for 1000 h at the sustained pressure requirements indicates any tendency of the restraint to fail in the long term. The minimum sustained pressure requirements for some common dimension ratios are shown in Table 2. The minimum sustained pressure for other dimension ratios of pipe produced from 12454 PVC Compound (for example, pipe conforming to Specification D1785) may be determined based on a hoop stress of 4200 psi (28.96 MPa).

(A) The pressures listed approximate a hoop stress of 4200 psi (28.96 MPa). Some minor adjustments have been made to keep the test pressures uniform in order to simplify testing.

4.4 A cyclic surge pressure test of restrained joint test specimens determines the effect of the joint restraint product on the cyclic fatigue life of PVC pipe. This test method provides a means for quickly identifying any reduction in performance that might result from the combination of the joint restraint product and the pipe. The peak hoop stress shall be determined for the pipe based on the Vinson equation for a period of 1 000 000 cycles. The base pressure shall be one half of the peak pressure. The peak pressure requirements for some common dimension ratios are shown in Table 3. The peak pressure for other dimension ratios for pipe produced from 12454 PVC Compound (for example, pipe conforming to Specification D1785) may be determined based on a hoop stress of 1587 psi (10.94 MPa).

(A) The peak pressures listed approximate a peak hoop stress of 1587 psi (10.94 MPa).

Subcomité:

F17.20

Referida por:

D2774-21A

Volúmen:

08.04

Número ICS:

23.040.99 (Other pipeline components)

Palabras clave:

cyclic surge pressure test; joint restraint for PVC; mechanical joint restraint for PVC pipe; Vinson equation ;