Flange of floating heat exchangers
1 Scope
This document specifies the type, code and basic parameters of shell flange-rear head ends and shell cover flanges of floating heat exchangers.
This document is applicable to carbon steel and low-alloy steel flanges with nominal pressure of 0.6 MPa to 6.4 MPa, operating temperature of -40°C to 450°C, and corrosion margin of no more than 3 mm.
2 Normative references
The following referenced documents are indispensable for the application 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 151 Heat exchangers
GB/T 29463 (all parts) Gaskets used in tube-shell heat exchangers
NB/T 47020-2012 Type and specification for pressure vessel flanges
NB/T 47023-2012 Welding neck flange
NB/T 47024 Nonmetallic gaskets
NB/T 47025 Spiral wound gaskets
NB/T 47026 Double jacketed gaskets
NB/T 47027 Stud blots & nuts for body flange
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 151 apply.
4 Symbols
For the purposes of this standard, the symbols given in Table 1 apply.
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Table 1 Description of symbols
Symbol Name Symbol Name
a Width of groove sealing face D4 Outer diameter of male sealing face, tenon sealing face
a1 Width of tenon sealing face H Flange height
D Outside diameter of flange h Flange neck height
d Diameter of bolt hole R Flange neck rounded corner
DN Nominal diameter of flange δ Flange thickness
D1 Diameter of bolt center circle δ0 Minimum thickness of butt cylinder
D2 Outer diameter of female sealing face, groove sealing face male part δ1 Thickness of small end of flange neck
D3 Outer diameter of flat sealing face, female sealing face and groove sealing face δ2 Thickness of large end of flange neck
5 Type of construction
5.1 Structure type of shell flange-rear head end
The structural type of shell flange-rear head end of flat sealing face is shown in Figure 1; the structural type of shell flange-rear head end of male sealing face is shown in Figure 2; the structural type of shell flange-rear head end of tenon sealing face is shown in Figure 3; the structural type of shell flange-rear head end of bush-ring flat sealing face is shown in Figure 4; the structural type of shell flange-rear head end of the bush-ring male sealing face is shown in Figure 5; the structural type of shell flange-rear head end of the bush-ring tenon sealing face is shown in Figure 6.
5.2 Structure type of shell cover flange
The structural type of shell cover flange of flat sealing face is shown in Figure 1; the structural type of shell cover flange of female sealing face is shown in Figure 7; the structural type of shell cover flange of groove sealing face is shown in Figure 8; the structural type of shell cover flange of bush-ring flat sealing face is shown in Figure 4; the structural type of shell cover flange of the bush-ring female sealing face is shown in Figure 9; the structural type of shell cover flange of the bush-ring groove sealing face is shown in Figure 10.
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Dimensions in millimeters Dimensions in millimeters
Foreword II
Introduction III
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Type of construction
6 Code and designation
7 Selection rules
8 Basic parameters
