Что означает обозначение D×d?

D — диаметр магистрали (проходной части), d — диаметр меньшего ответвления, например 108×57.

Стальной или резьбовой выбрать?

Для больших диаметров и высоких давлений — стальной под приварку (ГОСТ 17376); для малых диаметров и быстрого монтажа — резьбовой.

Из каких материалов?

Ст20, 09Г2С, 12Х18Н10Т (стальные); ковкий чугун (резьбовые).

Как присоединяется?

Стальной — сваркой встык, резьбовой — по трубной резьбе.

До какого давления?

Стальные — до Ру160.

Transition tee (D×d) — steel and threaded

Specifications

Technical parameters

Item	Transition tee (with a smaller branch)
Designation	D×d (trunk × branch)
Version	Welded steel / Threaded
Nominal bore DN	25-1420 (steel), 15-100 (thread)
Material	Ст20, 09Г2С, 12Х18Н10Т; ductile iron (threaded)
Connection	Butt welding / threaded
Standard	ГОСТ 17376-2001 / ГОСТ 8943–8968
Pressure	up to PN 160 (steel)
Medium	Water, steam, petroleum products, gas

Dimension diagram

Drawing to GOST

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

Dimensions

Dimension table

Do the magister.	Nar. Ø D, mm	C (center–end), mm	Branch d
50	60,3	64	≤ Ду50
80	88,9	86	≤ Ду80
100	114,3	105	≤ Ду100
150	168,3	143	≤ Ду150
200	219,1	178	≤ Ду200
250	273,0	216	≤ Ду250
300	323,9	254	≤ Ду300

D is the outer diameter of the main line, C is from the center to the end, d is the diameter of the branch (smaller than the main line). The full range of DN 25-1420 and specific pairs of D×d are ГОСТ 17376/запросу.

Kinds

Versions

Steel transition

Stamped/welded according to ГОСТ 17376, for welding, DN up to 1420.

Threaded adapter

Ductile iron/steel, DN 15-100, thread BP.

Materials

Ст20, 09Г2С, stainless steel; ductile iron for threaded.

Applications

Where they are used

Inset a branch with a smaller diameter
Heating networks, oil and gas, water supply
Strapping and distribution nodes

Order

What to state when ordering

A pair of D×d (Trunk and branch lines)
Design: welded / threaded
Steel grade/material, ГОСТ

Questions

Frequently asked questions

What does the designation D×d mean?

D is the diameter of the main line (passage part), d is the diameter of the smaller branch, for example 108×57.

Should I choose steel or threaded?

For large diameters and high pressures — steel for welding (ГОСТ 17376); for small diameters and quick installation — threaded.

From what materials?

Ст20, 09Г2С, 12Х18Н10Т ( steel); ductile iron (threaded).

How does it join?

Steel — butt welding, threaded — pipe thread.

Up to what pressure?

Steel — up to Ру160.

Transition tee