DL/T 646-2012 English PDF (DLT646-2012)

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DL/T 646-2012: Manufacturing technical requirements for steel tubular structures of substation and transmission line
DL/T 646-2012
DL
ELECTRIC POWER INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 29.020
K 90
Recoard No.. 37314-2012
DL/T 646–2012
Replacing DL/T 646–2006
Manufacturing technical requirements for steel tubular
structures of substation and transmission line
ISSUED ON. AUGUST 23, 2012
IMPLEMENTED ON. DECEMBER 01, 2012
Issued by. National Energy Administration
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Terms and definitions, symbols ... 7 
4 General provisions ... 9 
5 Product classifications ... 9 
6 Materials ... 9 
7 Parts processing ... 11 
8 Welding ... 16 
9 Weldment assembly ... 25 
10 Correction ... 27 
11 Test assembly ... 27 
12 Hot-dip galvanizing and hot spray zinc coating ... 29 
13 Inspection ... 30 
14 Packaging, marking, storage and transportation ... 36 
Annex A ... 37 
Annex B ... 39 
Annex C ... 41 
Annex D ... 42 
Foreword
This Standard is a revision of DL/T 646-2006 Manufacturing Technical Requirements for
Steel Tubular Structures of Substation and Transmission Line, according to National
Energy Administration’s Notification on Plan of Formulating/Revising 2010 Initial Energy
Industries Standards (GNKJ (2010) No.320) (Plan No.. Energy 20100214), which is to
standardize the production of steel pole, steel tubular tower and steel tubular structures of
substation and transmission line, and promote the application of new materials, processes
and technologies.
This Standard replaces DL/T 646-2006 Manufacturing Technical Requirements for Steel
Tubular Structures of Substation and Transmission Line. Compared with DL/T 646-646, the
main changes are as follows.
— Sufficiently consider the characteristics of high pressure steel tubular structure
products, processing technology and welding requirements of high strength steel
materials;
— Various domestic enterprises have accumulated rich experiences in steel tubular
structure manufacturing and testing through their years of practices. The mature
parts are accepted by the present revision.
— Have adjusted, increased and decreased some of items and tolerances;
— Have increased quality requirements of flange;
— Have modified the inspection rules.
This Standard was modified according to GB/T 1.1 Directives for standardization - Part 1.
the Structure and Drafting of Standards.
This Standard was proposed by and shall be under jurisdiction of China Electricity Council.
Drafting organizations of this Standard. Power Industry Power Equipment and
Transmission Material Inspection Test Center, Weifang Chang'an Steel Tower Co., Ltd.,
Zhejiang Shengda Steel Tower Co., Ltd., Fujian YongFu Project Consultant Co., Ltd.,
Qingdao Wuxiao [Group] Share Co., Ltd., Anhui Hongyuan Steel Tower Co., Ltd.,
Changshu Fengfan Power Equipment Co., Ltd., Yunnan Power Line Material Factory,
Qingdao Huijintong Electric Power Equipment Co., Ltd. AND Guangdong Electric Power
Line Equipment Factory.
Main drafters of this Standard. Cai Pengyi, Li Xianjin, Wang Jun, Dai Gangping, Zhao Jinfei,
Wang Zhizeng, Zhang Guixiang, Zhao Jinyuan, Su Bo, Ma Jinguang, Zhu Danming and
Ren Jindong.
The previous versions replaced by this Standard are. DL/T646-1998, DL/T 646-2006.
Manufacturing technical requirements for steel tubular
structures of substation and transmission line
1 Scope
This Standard specifies the requirements for materials, process, inspection, packaging,
marking, storage, transportation and so on during manufacturing steel pole, steel tubular
tower and steel tubular structures of substation-and-transmission line.
This Standard applies to steel tubular structures of substation-and-transmission line,
whose components mainly adopt polygonal and circular steel tubes and antiseptic
treatment by hot-dip-galvanized or hot-zinc-spray (zinc alloy) coatings. Other similar steel
tubular structure may reference to this Standard.
2 Normative references
The articles contained in the following documents have become part of this Standard when
they are quoted herein. For the dated documents so quoted, all the modifications (including
all corrections) or revisions made thereafter shall be applicable to this Standard.
GB/T 41 Hexagon nuts, type 1 (GB/T 41-2000, ISO 4034.1999, IDT)
GB/T 95 Plain washers - Product grade C (GB/T 95-2002, ISO 7091.2000, IDT)
GB/T 470 Zinc ingots (GB/T 470-2008, ISO 752.2004, MOD)
GB/T 699 Quality carbon structural steels
GB/T 700 Carbon structural steels (GB/T 700-2006, ISO 630.1995, NEQ)
GB/T 702 Hot-rolled steel bars - Dimensions, shape, weight and tolerances (GB/T 702-
2008, ISO 1035-1~4.1980, MOD)
GB/T 706 Hot rolled section steel
GB/T 709 Dimension shape weight and tolerances for hot-rolled steel plates and sheets
(GB/T 709-2006, ISO 7452.2002, ISO 16160.2000, NEQ)
GB/T 805 Tight nuts
GB/T 985.1 Recommended joint preparation for gas welding manual metal arc welding
gas-shield arc welding and beam welding (GB/T 985.1-2008, ISO 9692-1.2003, MOD)
GB/T 985.2 Recommended joint preparation for submerged arc welding (GB/T 985.2-
2008, ISO 9692-2.1998, MOD)
GB/T 1591 High strength low alloy structural steels
GB/T 2694 Specification of manufacturing for transmission line tower
GB/T 2828.1 Sampling procedures for inspection by attributes - Part 1. Sampling
schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection (GB/T
2828.1-2003, ISO 2859-1.1999, IDT)
GB/T 2829 Sampling procedures and tables for periodic inspection by attributes (Apply
to inspection of process stability)
GB/T 3091 Welded steel pipes for low pressure liquid delivery (GB/T 3091-2008, ISO
559.1991, NEQ)
GB/T 3098.1 Mechanical properties of fasteners - Bolts, screws and studs (GB/T
3098.1-2010, ISO 898-1.2009, MOD)
GB/T 3098.2 Mechanical properties of fasteners – Nuts - Coarse thread (GB/T 3098.2-
2000, ISO 898-2.1992, IDT)
GB/T 3323 Radiographic examination of fusion welded joints in metallic materials
GB/T 5117 Carbon steel covered electrodes
GB/T 5118 Low alloy steel covered electrodes
GB/T 5267.3 Fasteners - Hot dip galvanized coatings (GB/T 5267.3-2008, ISO
10684.2004, IDT)
GB/T 5293 Carbon steel electrodes and fluxs for submerged arc welding
GB/T 5780 Hexagon head bolts-Product grade C (GB/T 5780-2000, ISO 4016.1999,
IDT)
GB/T 8110 Welding electrodes and rods for gas shielding arc welding of carbon and low
alloy steel
GB/T 8162 Seamless steel tubes for structural purposes
GB/T 9793 Metallic and other inorganic coatings - Thermal spraying-Zinc, aluminium
and their alloys (GB/T 9793-1997, ISO 2063.1991, IDT)
GB/T 10045 Carbon steel flux cored electrodes for arc welding
GB/T 11345 Method for manual ultrasonic testing and classification of testing results for
ferritic steel welds
GB/T 12470 Low-alloy steel electrodes and fluxes for submerged arc welding
GB/T 13793 Steel pipes with a longitudinal electric (resistance) weld
GB/T 17493 Low alloy steel flux cored electrodes for arc welding
DL/T 284 Cold forging hot dip galvanizing bolt and nut for tower and hardware of
transmission lines
JGJ 81 Technical specification for Welding of steel structure of building
JG/T 203 Method for ultrasonic testing and classification for steel structures
3 Terms and definitions, symbols
3.1 Terms and definitions
The following terms and definitions apply to this Standard.
Part
The smallest unit of components and element, such as flanges, sti...