Чем крутоизогнутый отвод отличается от гнутого?

Крутоизогнутый (ГОСТ 17375) штампуется с R=1DN или 1,5DN и компактен. Гнутый (ГОСТ 30753) имеет увеличенный радиус и меньшее гидравлическое сопротивление.

Какой радиус выбрать?

R=1,5DN — стандарт для большинства задач; R=1DN — в стеснённых условиях монтажа.

Из каких сталей?

Ст20, 09Г2С (низкие t), 15ХМ/12Х1МФ (пар), 12Х18Н10Т (нержавеющие).

Как присоединяется?

Сваркой встык; толщина стенки — под трубу.

Большие диаметры и нестандартные углы?

Да — сварные секторные по ГОСТ 22790/17380 по чертежу.

Steel bends — steeply bent and bent according to ГОСТ 17375

Specifications

Technical parameters

Item	Steel tap (steeply bent/bent/sectorial)
The corners	45° · 60° · 90° · 180°
Bending radius	R=1·DN and 1,5·DN
Nominal bore DN	15-1420 mm
Outer diameter	21.3–1420 mm
Wall thickness	1.6–24 mm (through the pipe)
Material	Ст20, 09Г2С, 15ХМ, 12Х18Н10Т and others .
Connection	For butt welding
Standards	ГОСТ 17375-2001, 30753-2001, 22790, 17380
Pressure	up to PN 160
Temperature	-70...+450 °C (according to steel grade)
Medium	Water, steam, petroleum products, gas, aggressive media

Dimension diagram

Drawing to GOST

The letters on the diagram correspond to the columns of the dimension table below.

Dimensions

Dimension table

DN	Nominal diameter D, mm	Radius R (90°), mm	Wall thickness S, mm
15	21,3	19	1,6–3,2
20	26,9	29	1,6–3,2
25	33,7	38	2,0–4,0
32	42,4	48	2,0–4,0
40	48,3	57	2,0–5,0
50	60,3	76	2,9–5,5
65	76,1	95	2,9–6,0
80	88,9	114	3,2–7,0
100	114,3	152	4,0–8,0
125	139,7	190	4,0–9,0
150	168,3	229	4,5–11,0
200	219,1	305	6,0–12,0
250	273,0	381	6,0–14,0
300	323,9	457	7,0–16,0
350	355,6	533	8,0–16,0
400	406,4	610	9,0–16,0
500	508,0	762	9,0–20,0
600	610,0	914	9,0–22,0
700	711,0	1067	9,0–22,0
800	813,0	1219	10,0–24,0

Radius for steeply bent 90° C R=1,5· DN. Short radius (R=1·DN), 45°/60°/180° angles and other thicknesses are available on request. The wall thickness is through the pipe.

Types and versions

Types of taps

Steeply curved

Stamped according to ГОСТ 17375. The corners 45/60/90/180°, R=1DN and 1,5DN, DN 15-800.

Bent

Bent from a pipe according to ГОСТ 30753, the increased radius is a minimum of hydraulic resistance.

Sector welded

According to ГОСТ 22790/17380 for DN 500-1420 and non-standard angles.

In the corners

45° · 60° · 90° · 180° ( kalach); non—standard - according to the drawing.

Materials

Steel grades

Ст2009Г2С15ХМ12Х1МФ12Х18Н10Т10Х17Н13М2Т

Ст20 — general purpose; 09Г2С — for low temperatures; 15ХМ/12Х1МФ — for superheated steam; 12Х18Н10Т — stainless. Coating and ППУinsulation are possible.

Applications

Where they are used

45/60/90/180° rotation of the pipeline
Heating networks, steam pipelines, boiler houses, thermal power plants
Oil and gas pipelines, processing lines
Water supply and sanitation, housing and communal services

Order

What to state when ordering

DN (or outer diameter × wall thickness)
Angle (45/60/90/180°) and radius (1DN or 1,5DN)
Steel grade, ГОСТ
Type (steeply bent/bent/sectorial), coating

Questions

Frequently asked questions

How does a steeply bent branch differ from a bent one?

The steeply bent (ГОСТ 17375) is stamped with R=1DN or 1,5DN and is compact. Bent (ГОСТ 30753) has an increased radius and lower hydraulic resistance.

Which radius should I choose?

R=1,5DN — standard for most tasks; R=1DN — in cramped installation conditions.

What kind of steels?

Ст20, 09Г2С (low t), 15ХМ/12Х1МФ (steam), 12Х18Н10Т (stainless).

How does it join?

Butt welding; wall thickness — for the pipe.

Large diameters and non-standard angles?

Yes — sector welded according to ГОСТ 22790/17380 according to the drawing.

Steel bends