1 Scope
1.1 This standard specifies the manufacturing, inspection and acceptance requirements of aluminium, titanium, copper, nickel and nickel alloy pressure vessels, and common modes and basic parameters of heads.
1.2 This standard is applicable to semispherical, elliptical, dished, spherical cap, flat bottom and tapered heads for pressure vessels formed by pressing, spinning, rolling and splitting in whole plate or assembled plates.
1.3 The manufacture, inspection and acceptance requirements of heads for atmospheric pressure vessels and other pressure equipments may also comply with this standard by reference.
2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments to (excluding amending error in the text), or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest edition of the normative document is applicable. For undated references, the latest edition of the normative document applies.
GB 150 Steel Pressure Vessels (including Amendment)
GB 12337 Steel Spherical Tanks
JB/T 4711 Coating and packing for pressure vessels transport
JB/T 4730.2 Nondestructive Testing of Pressure Equipments-Part 2: Radiographic Testing
JB/T 4730.3 Nondestructive Testing of Pressure Equipments-Part 3: Ultrasonic Testing
JB/T 4730.4 Nondestructive Testing of Pressure Equipments-Part 4: Magnetic particle testing
JB/T 4730.5 Nondestructive Testing of Pressure Equipments-Part 5: Penetrant Testing
JB 4732 Steel Pressure Vessels-Design by Analysis
JB/T 4734 Aluminium welded vessels
JB/T 4745 Titanium Welded Vessels
JB/T 4755 Copper Pressure Vessels
JB/T 4756 Nickel and Nickel Alloy Pressure Vessels
3 Symbol Explanation
A——Inner surface area of head, m2;
C1——Thickness tolerance of material, which shall be selected according to corresponding material standard, mm;
DN——Head nominal diameter (according to those specified in Table 1 and Table 2), mm;
Di——Inner diameter of semispherical, elliptical, dished, spherical cap and flat bottom heads or inner diameter of the big end of tapered head, mm;
Do——Outer diameter of elliptical, dished and spherical heads, mm;
Dis——Inner diameter of the small end of the tapered head, mm;
H——Total depth of semispherical, spherical cap, flat bottom head and ellipse and dished heads with the inner diameter as reference, .mm;
Ho——Total height of tapered head, and ellipse and dished heads with the outer diameter as reference, mm;
H′——Total height from tapered head to cone apex, mm;
h——Straight flange height of semispherical, elliptical, dished, flat bottom and tapered heads, mm;
W——Head quality, kg;
Ri——The inner radius of hemispherical head, inner radius of spherical cap head and spherical surface part of dished head with inner diameter as reference; mm;
Ro——The outer radius of spherical face part of dished head with outer radius as reference, mm;
ri——Corner radius of flat bottom head and transition section of dished head with the inner diameter as reference as well as corner radius of transition section of the big end of tapered head, mm;
rs——Corner radius of transition section of the small end of the tapered head, mm;
ro——The outer radius of intersection angle of transition section of dished head with outer radius as reference, mm;
V——Volume of head, m3;
α——Half vertex angle of tapered head, (°);
δn——Nominal thickness of head, mm;
δs——Thickness of head material, that is, the feed intake thickness of material when manufacturing head, which is also the specification thickness in the material quality certificate, mm;
δmin——Minimum forming thickness of head, that is, the minimum thickness of finished head required in the design, mm;
δ′mim——Minimum thickness of finished head, that is the minimum value of actually-measured thickness of finished product, mm.
4 Mode Parameter and Mark
4.1 The name, section form, type code and mode parameter relationship of common head are detailed in Table 1 and Table 2. The final letter A or B of type code in Table 1 and Table 2 respectively represent taking inner diameter or outer diameter as reference. The numbers marked in the bracket of type code of tapered head are half vertex angle of tapered head required by design.
4.2 Except the types of dished heads listed in Table 1, there are some other common dished heads: Ri=0.8Di, ri=0.154Di; Ri=0.833Di, ri=0.154Di; Ri=1.0Di, ri=0.15Di; Ri=1.0Di, ri=0.06Di; Ri=0.9Di, ri=0.17Di ect. The calculation of dimension, internal surface area, volume, mass as well as total depth of dished heads may be carried out by reference to the methods provided in Appendix A.
