Standard No.:	GB/T 12459-2017
English Name:	Steel buttwelding pipe fittings—Types and parameter
Chinese Name:	钢制对焊管件 类型与参数
Chinese Classification:	J15    Pipeline fittings
Professional Classification:	GB    National Standard
ICS Classification:	23.040.60 23.040.60    Flanges, couplings and joints 23.040.60
Issued by:	AQSIQ,SAC
Issued on:	2017-03-03
Implemented on:	2017-9-1
Status:	valid
Superseding:	GB/T 12459-2005 Steel butt-welding seamless pipe fittings GB/T 13401-2005 Steel plate butt-welding pipe fittings
Language:	English
File Format:	PDF
Word Count:	12000 words
Price(USD):	300.0
Delivery:	via email in 1 business day

1 Scope This standard specifies types and codes, pressure design, dimensions, surface outlines, end bevels, tolerances, marking and product quality certificate of DN 15 ~ DN 1500 (NPS1/2~NPS60) steel buttwelding pipe fittings (hereinafter referred to as "pipe fittings"). This standard is applicable to steel buttwelding seamless and welding pipe fittings. 2 Normative References The following referenced documents are indispensable for the application of this document. For dated reference, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 9118 Loose Hubbed Steel Pipe Flanges with Welding Neck Collar GB/T 9124 Specification for Steel Pipe Flanges GB/T 13401-2017 Steel Buttwelding Pipe Fittings - Technical Specification 3 Types and Codes See Table 1 for types and codes of the pipe fittings. Table 1 Types and Codes of Pipe Fittings .... ... ....... 4 Pressure Design of Pipe Fittings 4.1 Pressure ratings Permissible pressure ratings of the pipe fittings designed and manufactured according to this standard may be calculated according to their connected seamless straight pipes with the same specifications, materials and wall thicknesses. The nominal dimensions (or outside diameters at bevel), material grades, wall thicknesses (or schedule number) marked on the pipe fittings represent the pressure ratings. 4.2 Design of pipe fittings 4.2.1 The pipe fittings shall be designed with the same internal pressure endurance capability as their connected seamless straight pipes with the same specifications, materials and wall thicknesses. 4.2.2 Pipe fittings produced according to this standard shall be designed according to the following methods: a) Carrying out confirmatory pressure test according to the requirements of Annex A and determine wall thicknesses of pipe fittings thereby. Where necessary, corresponding confirmatory pressure test report and record shall be provided for confirmation.

Foreword i 1 Scope 2 Normative References 3 Types and Codes 4 Pressure Design of Pipe Fittings 5 Dimensions of Pipe Fittings 6 Surface Outlines 7 End Bevels 8 Tolerances 9 Marking 10 Product Quality Certificate Annex A (Normative) Design Verification Test Annex B (Informative) Design and Calculation of Pipe Fittings