Foreword
Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This document is developed in accordance with the rules given in GB/T 1.1-2020 Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents.
This document replaces GB/T 13403-2008 Gaskets for large-diameter steel pipe flanges. In addition to structural adjustments and editorial changes, the following main technical changes have been made with respect to GB/T 13403-2008:
a) The grooved metal gaskets with covering layers and related requirements are added (see Clause 1, Clause 4, 5.1.4, 5.2.4, Clause 6 and Clause 7 hereof);
b) The description of the dimension selection and type selection of gasket with "locating ring" is added (see Tables 1 and 2 hereof);
c) The dimensions of non-metallic flat gaskets and reinforced flexible graphite gaskets for Class 75 of B series flange are added (see Table 4 and Table 12 hereof);
d) The dimensions of non-metallic flat gaskets, composite wave-serrated metal gaskets and reinforced flexible graphite gaskets are modified (see Tables 3-8, 11-12 hereof; Tables 3-10 of Edition 2008);
e) The dimension limit deviation of gaskets is modified (see Tables 13-15, Table 17 hereof; Tables 11-14 of Edition 2008);
f) The dimension limit deviation requirements for non-metallic flat gaskets of rubber sheets are added (see Table 14 hereof);
g) The requirements for transportation and storage of product are added (see 8.2.3).
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing body of this document shall not be held responsible for identifying any or all such patent rights.
This document was proposed by the China Machinery Industry Federation.
This document is under the jurisdiction of National Technical Committee on Pipeline Fittings of Standardization Administration of China (SAC/TC 237).
This document was issued in 1992 as first edition, its first revision was issued in 2008, and this is the second revision.
Gaskets for large-diameter steel pipe flanges
1 Scope
This document specifies the requirements, inspection, marking and labeling, packaging, transportation and storage of gaskets for large-diameter steel pipe flanges.
This document is applicable to the spiral wound gasket, composite wave-serrated metal gaskets (hereinafter referred to as wave-serrated gaskets), grooved metal gaskets with covering layers (hereinafter referred to as grooved gaskets) for large-diameter steel pipe flanges of DN 650(NPS 26)~DN 1 500 (NPS 60), Class 150~Class 900, as well as the non-metallic flat gaskets and reinforced flexible graphite gaskets (hereinafter referred to as reinforced gaskets) for Class 75~Class 300.
2 Normative references
The following documents contain requirements 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 4622.2 Spiral wound gaskets for pipe flanges - Part 2: Class designated
GB/T 5574 Industrial rubber sheet
GB/T 9126.2 Non-metallic flat gaskets for pipe flanges - Part 2: Class designated
GB/T 19066.2 Composite wave-serrated metal gaskets for pipe flanges - Part 2: Class designated
GB/T 19675.2 Reinforced flexible graphite gaskets for pipe flanges - Part 2: Class designated
GB/T 39245.2 Grooved metal gaskets with covering layers for pipe flanges - Part 2: Class designated
3 Terms and definitions
No terms and definitions are listed in this document.
4 Symbols
For the purposes of this document, the following symbols apply.
b: Width of locating lug of wave-serrated gasket, mm
c: Edge covering width of reinforced gasket (metal), mm;
D: Outside diameter of on-metallic flat gaskets/outside diameter of reinforced gasket/outside diameter of locating lug of wave-serrated gasket, mm
D1: Inside diameter of inner ring of spiral wound gasket, mm
D2: Inside diameter of sealing element of spiral wound gasket/inside diameter of metallic framework of wave-serrated gasket/inside diameter of metal core of grooved gasket, mm
D3: Outside diameter of sealing element of spiral wound gasket (inside diameter of locating ring)/outside diameter of metallic framework of wave-serrated gasket/outside diameter of metal core of grooved gasket, mm
D4: Outside diameter of locating ring of spiral wound gasket/outside diameter of locating ring of wave-serrated gasket/outside diameter of movable locating ring of grooved gasket, mm
d: Inside diameter of non-metallic flat gasket/inside diameter of reinforced gasket, mm
K: Center distance of locating lug of wave-serrated gasket (diameter of center circle of flange bolt hole), mm
L: Diameter of locating lug hole of wave-serrated gasket (diameter of flange bolt hole), mm
T: Thickness of sealing element of spiral wound gasket/thickness of non-metallic flat gaskets/overall thickness of wave-serrated gasket/overall thickness of grooved gasket/thickness of reinforced gasket, mm
t: Thickness of metallic framework of wave-serrated gasket/thickness of metal core of grooved gasket, mm
t1: Thickness of locating ring of spiral wound gasket/thickness of locating ring of wave-serrated gasket/thickness of movable locating ring of grooved gasket, mm
5 Requirements
5.1 Type and dimension
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Requirements
5.1 Type and dimension
5.2 Performance and dimension limit deviation
6 Inspection
6.1 General
6.2 Sampling and batching
6.3 Inspection classification and items
6.4 Inspection methods and judgment rules
7 Marking and labeling
8 Packaging, transportation and storage
8.1 Packaging
8.2 Transportation and storage
Bibliography
