GOST 8946-75 Ductile Iron Fittings with Parallel Thread for Pipelines. Union Passage Elbows. Basic Dimensions

GOST 8946-75 applies to 90° and 45° union passage elbows made of ductile iron with parallel thread for pipelines. The standard fully complies with ST SEV 3298-81.

FITTINGS MADE OF DUCTILE IRON WITH PARALLEL THREAD FOR PIPELINES. UNION PASSAGE ELBOWS Basic dimensions Ductile iron and steel fittings with parallel thread for pipelines. Union passage elbews. Basic dimensions.	GOST 8946-75* (ST SEV 3298-81) Supersedes GOST 8946-59

90° elbows are manufactured in two types: 1 — with internal thread, 2 — with external thread.

The basic dimensions of 90° elbows shall comply with those shown in Fig. 1 and Table 1. The drawing does not define the design of the elbow.

Table 1. Dimensions in mm.

Nominal	Thread d	L	L₁	Mass without coating, kg, max*
bore						Variant per GOST 8944-75
Dy						1	2
8	G¹/₄- B	21	28	0.042	0.045
10	G3/₈- B	25	32	0.059	0.064
15	G¹/₂ - B	28	37	0.094	0.103
20	G³/₄ - B	33	43	0.146	0.152
25	G 1 - B	38	52	0.229	0.241
32	G1¹/₄ - B	45	60	0.352	0.351
40	G 1¹/₂ - B	50	65	0.494	0.438
50	G 2 - B	58	74	0.790	0.720
(65)	G 2¹/₂ - B	69	88	1.141	1.030
(80)	G 3 - B	78	98	1.521	1.409
(100)	G 4 - B	96	-	3.079	2.680

Notes:

1. Elbows with Dy values shown in parentheses in the table are not recommended for use.
2. The mass of galvanized fittings shall not exceed the mass of non-galvanized fittings by more than 5%.

Examples of designations:

Union passage elbow with 90° angle, type 1, without coating, with Dy = 40 mm: Elbow 90°-1-40 GOST 8946-75.

The same elbow with zinc coating: Elbow 90°-1-Ts-40 GOST 8946-75.

45° elbows are manufactured in two types: 1 — with internal thread, 2 — with external thread.

The basic dimensions of the 45° elbow shall comply with those shown in Fig. 2 and Table 2. The drawing does not define the design of the elbow.

Table 2. Dimensions in mm.

Nominal bore Dy	Thread d	L	L₁
10	G¹/₈- B	0	25
15	G¹/₂- B	22	28
20	G³/₄ - B	25	32
25	G 1 - B	28	37
32	G 1¹/₄ - B	33	43
40	G 1¹/₂ - B	36	46
50	G 2 - B	43	55

Examples of designations:

Union passage elbow with 45° angle, type 1, without coating, with Dy = 40 mm: Elbow 45°-1-40 GOST 8946-75.

The same elbow with zinc coating: Elbow 45°-1-Ts-40 GOST 8946-75.

Structural dimensions and technical requirements are per GOST 8944-75.