Forged branch outlet fittings
1 Scope
This document specifies the varieties and codes, pressure rating, nozzle dimensions, special branch outlet fittings, order information, shapes, dimensions and tolerances, materials, design and manufacture, heat treatment, inspection and test, marking, surface protection and packaging, product quality certificate and other requirements of forged branch outlet fittings, and also provides an installation guide.
This document is applicable to branch outlet fittings forged of steel in piping systems.
Note: The branch outlet fittings in this document refer to the reducing branch outlet fittings, i.e., the branch outlet fittings with the main pipe being larger than the branch pipe in diameter.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 9124 (all parts) Steel pipe flanges
GB/T 12459 Steel buttwelding pipe fittings - Types and parameter
GB/T 12716 Pipe threads with the thread angle of 60 degrees where pressure-tight joints are made on threads
GB/T 14383 Forged fittings, socket-welding and threaded
GB/T 18253-2018 Steel and steel products - Types of inspection documents
GB/T 20801.3 Pressure piping code - Industrial piping - Part 3: Design and calculation
GB/T 28708 Specification for size selection of seamless and welded steel pipe used in piping engineering
NB/T 47013.3 Nondestructive testing of pressure equipments - Part 3: Ultrasonic testing
NB/T 47013.4 Nondestructive testing of pressure equipments - Part 4: Magnetic particle testing
NB/T 47013.5 Nondestructive testing of pressure equipments - Part 5: Penetrant testing
3 Terms and definitions
No terms and definitions are listed in this document.
4 Varieties and codes
See Table 1 for the varieties and codes of branch outlet fittings.
Foreword I
1 Scope
2 Normative references
3 Terms and definitions
4 Varieties and codes
5 Pressure rating
6 Nozzle dimensions
7 Special branch outlet fittings
8 Order information
9 Shapes, dimensions and tolerances
10 Materials
11 Design, manufacture and installation
12 Heat treatment
13 Inspection and test
14 Marking
15 Surface protection and packaging
16 Product quality certificate
Annex A (Normative) Design verification test
Annex B (Informative) Installation guide
Bibliography
