At the option of the manufacturer any one of the tests described in 11.2.1 and 11.2.2 shall be carried out.
11.2.1 Drift Expanding Test
It shall be carried out on sockets in accordance with IS 2335, on a conical mandrel having an included taper on diameter 1 in 16 and the minimum increase in outside diameter after expansion shall be as follows:
Table 29 Tolerance
(Clause 9.2.1)
All dimensions in millimetres.
i) | Dimensions: Above=—, Up to and Including=30, Tolerance=± 1.5 ii) | Dimensions: Above=30, Up to and Including=50, Tolerance=± 2.0 iii) | Dimensions: Above=50, Up to and Including=75, Tolerance=± 2.5 iv) | Dimensions: Above=75, Up to and Including=100, Tolerance=± 3.0 v) | Dimensions: Above=100, Up to and Including=175, Tolerance=± 3.5
NOTES
1 Centre to face dimensions apply to elbows, bends, tees, crosses, etc.
2 Face to face dimensions apply to sockets, nipples, etc.
3 Centre to centre dimensions apply to return bends.
| Percentage of Expansion Min | |
|---|---|
| Up to and including 25 | 2.0 |
| 32-40 | 1.5 |
| 50-80 | 1.0 |
| 100-50 | 0.5 |
| Lot Size: (2)=3 001-5 000 | Stage: (3)=First | Sample Size: (4)=32 | Cumu- lative Sample Size: (5)=32 | Accep- tance Num- ber: (6)=0 | Reject- ion Num- ber: (7)=3 | Sl No.: (1)=iii) | Lot Size: (2)=3 001-5 000 | Stage: (3)=Second | Sample Size: (4)=32 | Cumu- lative Sample Size: (5)=64 | Accep- tance Num- ber: (6)=3 | Reject- ion Num- ber: (7)=4 | Sl No.: (1)=iv) | Lot Size: (2)=5 001-10 000 | Stage: (3)=First | Sample Size: (4)=50 | Cumu- lative Sample Size: (5)=50 | Accep- tance Num- ber: (6)=1 | Reject- ion Num- ber: (7)=4 | Sl No.: (1)=iv) | Lot Size: (2)=5 001-10 000 | Stage: (3)=Second | Sample Size: (4)=50 | Cumu- lative Sample Size: (5)=100 | Accep- tance Num- ber: (6)=4 | Reject- ion Num- ber: (7)=5 | Sl No.: (1)=v) | Lot Size: (2)=10 001 and above | Stage: (3)=First | Sample Size: (4)=80 | Cumu- lative Sample Size: (5)=80 | Accep- tance Num- ber: (6)=2 | Reject- ion Num- ber: (7)=5 | Sl No.: (1)=v) | Lot Size: (2)=10 001 and above | Stage: (3)=Second | Sample Size: (4)=80 | Cumu- lative Sample Size: (5)=160 | Accep- tance Num- ber: (6)=6 | Reject- ion Num- ber: (7)=7
Table 30 Scale of Sampling and Acceptance Criteria for Pressure Test
(Clause 11.1.1) | Sl No.: (1)=i) | Lot Size: (2)=Up to 1 000 | Stage: (3)=First | Sample Size: (4)=13 | Cumu- lative Sample Size: (5)=13 | Accep- tance Num- ber: (6)=0 | Reject- ion Num- ber: (7)=2 | Sl No.: (1)=i) | Lot Size: (2)=Up to 1 000 | Stage: (3)=Second | Sample Size: (4)=13 | Cumu- lative Sample Size: (5)=26 | Accep- tance Num- ber: (6)=1 | Reject- ion Num- ber: (7)=2 | Sl No.: (1)=ii) | Lot Size: (2)=1 001-3 000 | Stage: (3)=First | Sample Size: (4)=20 | Cumu- lative Sample Size: (5)=20 | Accep- tance Num- ber: (6)=0 | Reject- ion Num- ber: (7)=2 | Sl No.: (1)=ii) | Lot Size: (2)=1 001-3 000 | Stage: (3)=Second | Sample Size: (4)=20 | Cumu- lative Sample Size: (5)=40 | Accep- tance Num- ber: (6)=1 | Reject- ion Num- ber: (7)=2 | Sl No.: (1)=iii)
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | |
|---|---|---|---|---|---|---|---|
| Sl No. | i) | ||||||
| Lot Size | Up to 1 000 | ||||||
| Stage | First | ||||||
| Sample Size | 13 | ||||||
| Cumu- lative Sample Size | 13 | ||||||
| Accep- tance Num- ber | 0 | ||||||
| Reject- ion Num- ber | 2 | ||||||
| Stage | Second | ||||||
| Cumu- lative Sample Size | 26 | ||||||
| Accep- tance Num- ber | 1 | ||||||
| Sl No. | ii) | ||||||
| Lot Size | 1 001-3 000 | ||||||
| Sample Size | 20 | ||||||
| Cumu- lative Sample Size | 20 | ||||||
| Cumu- lative Sample Size | 40 | ||||||
| Sl No. | iii) | ||||||
| Lot Size | 3 001-5 000 | ||||||
| Sample Size | 32 | ||||||
| Cumu- lative Sample Size | 32 | ||||||
| Reject- ion Num- ber | 3 | ||||||
| Cumu- lative Sample Size | 64 | ||||||
| Accep- tance Num- ber | 3 | ||||||
| Reject- ion Num- ber | 4 | ||||||
| Sl No. | iv) | ||||||
| Lot Size | 5 001-10 000 | ||||||
| Sample Size | 50 | ||||||
| Cumu- lative Sample Size | 50 | ||||||
| Cumu- lative Sample Size | 100 | ||||||
| Accep- tance Num- ber | 4 | ||||||
| Reject- ion Num- ber | 5 | ||||||
| Sl No. | v) | ||||||
| Lot Size | 10 001 and above | ||||||
| Sample Size | 80 | ||||||
| Cumu- lative Sample Size | 80 | ||||||
| Accep- tance Num- ber | 2 | ||||||
| Cumu- lative Sample Size | 160 | ||||||
| Accep- tance Num- ber | 6 | ||||||
| Reject- ion Num- ber | 7 |
11.2.2
Taper Screw Plug Test
Sockets shall be capable of withstanding the expansion test as described below without showing any sign of fracture of failure.
11.2.2.1
The test shall consist of screwing the selected socket on a taper screw plug.
11.2.2.2
The threads of socket shall be thoroughly clean and free from foreign matter. Should the threads show sign of burr, this shall be removed by means of a pipe thread tap. The threads of the socket and the end of the test plug shall be lubricated with oil, and the socket shall then be screwed on to the test plug between the jaws of a vice or other suitable fixtures and by rotating the socket with both hands. The socket shall then be further rotated five complete turns beyond hand tightness, either by means of a pipe wrench of an adequate length to operate the test with gradual turning or by a power machine giving an appropriate leverage. The wrench shall not be hammered (see Fig. 1).
11.2.2.3
The plugs shall be manufactured from steel and shall be hardened to give a Vickers hardness between 700 and 800 HV when determined by applying a load of 30 kgf in accordance with IS 1501.
11.2.2.4
The dimensions of plug shall conform with those given in Table 31. The threads shall be ground after the plugs are case hardened, and the thread form and angle of taper shall be in accordance with the appropriate dimensions and tolerances specified in IS 554.
11.2.2.5
For routine testing, use may be made, if so desired, of unhardened steel plugs in accordance with the dimensions given in Table 31 and having machined threads. The thread form and angle of taper being in accordance with the appropriate dimensions and tolerance specified in IS 554 .
11.2.2.6
In case of dispute, however in the test shall be carried out with the hardened plugs specified in 11.2.2.3 and 11.2.2.4.