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.

Дата добавления: 2014-10-15