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HG/T 20611-2009 PDF English

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HG/T 20611-2009: Covered serrated metal gaskets for use with steel pipe flanges (PN designated)
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Status: Valid

HG/T 20611: Historical versions

Standard IDUSDBUY PDFDeliveryStandard Title (Description)Status
HG/T 20611-200975 Add to Cart Auto, 9 seconds. Covered serrated metal gaskets for use with steel pipe flanges (PN designated) Valid
HG 20611-1997RFQ ASK 9 days Tooth Profile Combined Gaskets forSteel Pipe Flanges Obsolete

Similar standards

GB/T 19326   GB/T 17241.6   HG/T 20607   

HG/T 20611-2009: Covered serrated metal gaskets for use with steel pipe flanges (PN designated)

---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/HGT20611-2009
Chemical Industry Standard of the People's Republic of China HG Replacing HG 20611-1997 Covered Serrated Metal Gaskets for use with Steel Pipe Flanges (PN designated) (PN系列) Issued on: FEBRUARY 5, 2009 Implemented on: JULY 1, 2009 Issued by. Ministry of Industry and Information Technology of the People's Republic of China

Table of Contents

1. Scope ... 3 2. Normative References ... 3 3. General Provisions ... 3 3.1 Type and Code Name ... 3 3.2 Nominal Pressure and Nominal Dimension ... 4 3.3 Usage of Gaskets ... 4 3.4 Materials ... 5 4. Dimension ... 5 5. Technical Requirements ... 8 6. Inspection ... 9 7. Labeling... 9

1. Scope

This standard specifies the type, dimension, technical requirements, labeling and marking of covered serrated metal gaskets for steel pipe flanges (PN designated). This standard is applicable to covered serrated metal gaskets for steel pipe flanges specified in HG/T 20592 whose nominal pressure is PN16~PN160.

2. Normative References

The following standards contain provisions which, through reference in this text, constitute provisions of this national standard. For dated reference, subsequent amendments (excluding amending error in the text) to, or revisions of, any of these publications do not apply. However, parties to agreement based on this standard are encouraged to research whether the latest editions of these references are applied or not. For undated references, the latest edition of the normative document is applicable to this national standard. "Hot-rolled Plain Carbon and Low Alloy Structural Steel Sheets and Strips" GB/T 912 "Hot Rolled Stainless Steel Plate Sheets and Strips” GB/T 4237"Cold Rolled Stainless Steel Plate Sheets and Strips” GB/T 3280 "Steel Pipe Flanges (PN designated)" HG/T 20592 “Specification for Selection of Steel Pipe Flanges, Gaskets and Bolting (PN designated)” HG/T 20614 "Specification for Flexible Graphite Plates" TB/T 7758.2 "PTFE Sheers" QB/T 3625

3. General Provisions

3.1 Type and Code Name The type, code name, section form and applicable flange sealing surface of gaskets shall meet the provisions of Table 3.1. Table 3.3.1 Service Temperature Scope of Gaskets Serrated metal-ring material Cladding material Service temperature scope ( )℃ Steel grade Standard Name Reference standard 0Cr18Ni9(304) GB/T 4237 GB/T 3280 Flexible graphite JB/T 7758.2 -200~+650· 00Cr19Ni10(304L) PTFE QB/T 3625 -200~+200 0Cr17Ni12Mo2(316) 00Cr17Ni14Mo2(316L) 0Cr18N0Ti(321) 0Cr18NillNb(347) 0Cr25Ni20(310) When it is used for oxidizing media, the maximum service temperature shall be 450 . ℃ 3.4 Materials 3.4.1 The typical materials for serrated metal ring shall meet the provisions of Table 3.3.1 of this standard; other materials may also be adopted if they are indicated at ordering. 3.4.2 The typical cladding materials are flexible graphite and PTFE plates; other cladding materials may also be adopted if they are indicated at ordering. 3.4.3 The property of flexible graphite/PTFE plates shall meet the provisions of both Table 3.4.3 and Table 3.3.1 of this standard. Recycled materials shall not be used for PTFE. 3.4.4 The materials for integral centring ring shall be the same as that for serrated metal ring. Unless otherwise stated by users, carbon steel can be adopted for mobile centring ring, but the carbon steel shall meet the provisions of GB/T 912. Such surface treatment as spraying, electroplating or others shall be adopted. Table 3.4.3 Main Performance of Cladding Materials Item Flexible graphite PTFE Tensile strength (transverse)(MPa) ≥15 Content of chloride ion(X10-6) ≤50 Melting point( )℃ 327±10

4. Dimension

The dimension of gaskets shall meet the provisions of Figure 4, Table 4-1 and Table 4-2.”h" in Figure 4 is the minimum value. Table 4-1 Dimension of Centring Ring (B type or C type) Gaskets for Raised Face Flanges (mm) Nominal dimension DN Serrated metal ring Outside diameter of centring ringD1 Thickness of serrated metal ring Thickness of integral centring ring Thickness of mobile centring ring t1 Cladding thickness Inside diameter D3 Outside diameterD2 PN16~PN40 PN 63~PN160 PN16 PN25 PN40 PN63 PN100 PN160 10 22 36 36 46 56 15 26 42 42 51 61 20 31 47 47 61 72 25 36 52 52 7l 82 32 46 62 62 82 88 40 53 69 69 92 103 50 65 81 81 107 113 119 65 81 100 100 127 138 144 80 95 115 115 142 148 154 100 118 138 138 162 168 174 180 125 142 162 162 192 194 210 217 150 170 190 190 218 224 247 257 200 220 240 248 273 284 290 309 324 4.0 250 270 290 300 329 340 352 364 391 388 300 320 340 356 384 400 417 424 458 458 2.0 1.5 0.5 350 375 395 415 444 457 474 486 512 ___ 400 426 450 474 495 514 546 543 572 ___ 450 480 506 ___ 555 564 571 ___ ___ ___ 500 530 560 ___ 617 624 628 ___ ___ ___ 600 630 664 ___ 734 731 747 ___ ___ ___ 700 730 770 ___ 804 833 ___ ___ ___ ___ 800 830 876 ___ 911 942 ___ ___ ___ ___ 900 930 982 ___ 1011 1042 ___ ___ ___ ___ 1000 1040 1098 ___ 1128 1155 ___ ___ ___ ___ 1200 1250 1320 ___ 1342 1365 ___ ___ ___ ___ 1400 1440 1522 ___ 1542 ___ ___ ___ ___ ___ 1600 1650 1742 ___ 1764 ___ ___ ___ ___ ___ 5.0 1800 1850 1914 ___ 1964 ___ ___ 2000 2050 2120 ___ 2168 ___ ___ 1 Generally, the serrated metal ring is integrally constructed. If weld structure is adopted, the following requirements shall be complied with. 1) Get approval from the users; 2) Complete penetration type shall be adopted as welding seam structure; there shall be no more than two soldered joints and stress-relief heat treatment shall be carried out after welding; 3) Before covering the cladding, the serrated form and dimension of the weld part shall be in accordance with other parts. 2 The planeness of serrated metal ring shall be no bigger than 1/100 of the outside diameter of the gasket. 3 The cladding materials shall be fixed firmly on the serrated metal ring so that they won't scale off during the transportation or assembly process. The adhesive used shall have no corrosion to the metallic materials. There shall be no more than two scabbed joints, if overlapping is adopted, the overlap section shall be connected through bias cutting; if abutting is adopted, a thinner cladding material shall be covered at the seam crossing. 4 There shall be proper clearance between the centering groove between the mobile centering ring and serrated metal ring so that when it expands at heating, it will not disturb movement. Welding method may be adopted for mobile centering ring. 5.0.4 Performance The performance of gaskets shall meet the relevant provisions specified by users.

6. Inspection

6.0.1 The material, dimension, appearance and manufacture of gaskets shall be compliant to the provisions of this standard. 6.0.2 Other inspection requirements may be determined through negotiating with the producers at ordering.

7. Labeling

7.0.1 Labeling and illustration 1 The gasket shall be labeled according to the following provisions. 1) Standard name; 2) Gasket type (refer to the provisions of Table 3.1 of this standard); 3) Nominal dimension (DN); 4) Nominal pressure (PN); 5) Material code names for serrated metal ring, cladding and mobile centering ring (refer to the provisions of Table 7.0.1). When carbon steel is used for mobile centering ring, its code name may be omitted. Table 7.0.1 Material Marking and Abbreviated Code Name Material Abbreviated code name Material Abbreviated code name Material Abbreviated code name 0Cr18Ni9 304 0Cr25Ni20 310 Ni- Fe- Cr alloy Incoloy 800 IN 800 00Cr19Ni10 304L Titanium TI Zirconium ZIRC 0Cr17Ni12Mo2 316 Ni-Cu alloy Monel 400 MON Flexible graphite FG 00Cr17Ni14Mo2 316L Ni-Cu alloy Hastelloy B2 HAST B PTFE PTFE 0Cr18Ni10Ti 32l Ni- Mo- Cr alloy Hastelloy C-276 HAST C 0Cr18Ni11Nb 347 Ni- Cr- Fe alloy Inconel 600 INC 600 2 Marking illustration. Covered serrated metal gaskets (C type) for steel pipe flanges whose nominal dimension is DN100, nominal pressure is PN40, 0Cr18Ni9 is used as serrated metal-ring material, flexible graphite is used as cladding material, carbon steel is used for mobile centring ring, its marking is. HG/T 20611 serrated gaskets C 100-40 304/FG 7.0.2 Marking 1 There shall be a permanent marking (e.g.. steel seal) on the centring ring of the gasket. Basic type gaskets shall be marked with a fixed label. The labeling mode (including color code) shall meet the provisions of producers or users. The marking shall contain the following content. 1) Name or trademark of the producer; 2) Standard No.; 3) Nominal dimension (DN); 4) Nominal pressure (PN); 5) Ma... ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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