PIPE COUPLINGS (STATE STANDARD 8955-75)

LOCK NUTS (STATE STANDARD 8961-75 )

Pipe 20 State Standard 3262-75.

Table 4.12

Nominal bore, Dy, mm Thread G, inch External diameter, mm Internal diameter, mm Thickness of a wall pipe, s, mm L1, mm L2, mm   L, mm
Thin-walled Normal Thick-walled
3/8 16.663 14.951 2.2 2.8 8.5
1/2 20.956 18.532 2.5 2.8 3.2
3/4 26.442 24.119 2.5 2.8 3.2 10.5
33.250 30.292 2.8 3.2 11.0
41.912 38.954 2.8 3.2 13.0
47.805 44.847 3.5 15.0
59.616 56.659 3.5 4.5 17.0

The example of the conventional denotation of a steel non-galvanized pipe with the nominal bore 20 mm:

 

Pipe fittings are used for joining pipe different lengths and to provide changes of direction, branch connection at different angles or to effect a change in size. The fittings are made for screwed, flanged or welded connection.

A drawings and structural sizes of the pipe fittings is pointed below.

 

 

 

Figure 4.27 – Conventional drawings of lock nut

 

Table 4.13

Nominal bore, Dy, mm Thread G, inch External diameter, mm Internal diameter, mm H, mm D, mm S, mm Chamfer с, mm
3/8 16.663 14.951 31,2
1/2 20.956 18.532 36,9 1,5
3/4 26.442 24.119 41,6 1,5
33.25 30.292 53,1
41.912 38.954 63,5
47.805 44.847 69,3
59.616 56.659 86,5

The example of the conventional denotation of a lock-nut with the nominal bore 20 mm: Lock-nut 20 State Standard 8961-75.

 

Figure 4.28 – Conventional drawings of pipe coupling

Table 4.14

Nominal bore, Dy, mm Thread G, inch L, mm l , mm D1, mm D2, mm B, mm b1, mm b2, mm h, mm Number of ribs   Chamfer с, mm
3/8 3.5
1/2 1,5
3/4 10.5 32.5 2.5 2.5 1,5
39.5 2.5 2.5 4.5 2.5
2.5
68.5 3.5 3.5

Note. Sizes of external and internal diameters are resulted in table 4.12.

The example of the conventional denotation of a pipe coupling with the nominal bore 20 mm: Pipe Coupling 20 State Standard 8955-75.