Tees (state Standard 8948-75)

ELBOWS (STATE STANDARD 8946-75)

REDUCERS OR REDUCING COUPLINGS (STATE STANDARD 8957-75)

Figure 4.29 – Conventional drawings of reducing coupling

Table 4.15

Nominal bore, Dy, mm	Threads G1хG2, inch	L, mm	l, mm	l1, mm	l2, mm	D1, mm	D2, mm	D3, mm	D4, mm	b, mm	b1, mm	b2, mm	h, mm	Number of ribs
20х10	3/4 х3/8											3.5
20х15	3/4х1/2											3.5
25х15	1 х 1/2
32х15	1 х1/2					48.5				2.5			2.5
32х20	1 х3/4					48.5			32.5	2.5			2.5
32х25	1 х 1					48.5			39.5	2.5			2.5
40х20	1 х3/4					55.5			32.5	2.5	2.5	4.5	2.5
40х25	1 х 1					55.5			39.5	2.5	2.5	4.5	2.5
50х25	2х1										2.5

The example of the conventional denotation of a reducing coupling with the nominal bore 20 mm: Reducing Coupling 20 State Standard 8957-75.

Figure 4.30 – Conventional drawings of an elbow

Table 4.16

Nominal bore, Dy, mm	Thread G, inch	L, mm	l, mm	D1, mm	D2, mm	b, mm	R1, mm	R2, mm	R3, mm	R4, mm	S, mm
	3/8		10.0			2.0		6.5	23.5		2.5
	1/2		12.0	28,6	26,6	2.0	2,7	5,5	26,5	29,3	2.8
	3/4		13.5	34,9	32,4	2.5	3.3	6,3	32,8	35,7	3.0
			15.0	42,1	39,6	2.5	3.2	6,5	39,5	42,8	3.3
			17.0			3.0	3,4			52,6	3.6
			19.0			3.0				60,5	4.0
			21.0	70,5		3.5	2,5			71,5	4.5

The example of the conventional denotation of an elbow with the nominal bore 20 mm: Elbow 20 State Standard 8946-75.

Figure 4.31 – Conventional drawings of a tee

Table 4.17

Nominal bore, Dy, mm	Thread G, inch	L, mm	l, mm	D1, mm	D2, mm	b, mm	R1, mm	R2, mm	S, mm
	3/8		10.0			2.0		6.5	2.5
	1/2		12.0	28.6	26.6	2.0	2.7	5.5	2.8
	3/4		13.5	34.9	32.4	2.5	3.3	6.3	3.0
			15.0	42.1	39.6	2.5	3.2	6.5	3.3
			17.0			3.0	3.4		3.6
			19.0			3.0			4.0
			21.0	70.5		3.5	2.5		4.5

The example of the conventional denotation of a tee with the nominal bore 20 mm: Tee 20 State Standard 8948-75.

The drawing of a joint is begun with the drawing of a pipe, then the view of connecting parts are drawn according to the sizes in tables (4.12 – 4.17). A pipe on the drawing is shown by not screw up in a connecting part on 2-4 mm (1-2 threads), that is why a thread on a pipe is at the face of the connecting part. Figure 4.32 shows the drawing of the pipe joint by a pipe coupling. An external thread on a pipe is drawn the same as on the bar of a bolt by a continuous contour line on the most diameter and by a continuous thin line on the internal diameter of a thread. Such view of a thread on a pipe will be in joint with other parts.

Figure 4.32 – Pipe joint by a pipe coupling

An internal thread in connecting parts remains unchanging only in the places not taken by the pipe.

Дата добавления: 2014-10-15