1 Scope
1.1 This Part specifies the structural types, series parameters and dimensions, permissible loads, materials, as well as manufacturing technology requirements of the leg supports (hereinafter referred to as supports) of the vertical steel vessels (hereinafter referred to as vessels).
1.2 This Part is applicable to the vessels directly installed on the rigid subgrade and meeting the following conditions:
a) Nominal diameter is DN400mm~1600mm;
b) Ratio of cylinder tangent length L to nominal diameter DN is not greater than 5;
c) Total height of vessel H1: not greater than 5000mm for the angle strut and steel pipe strut; not greater than 8000mm for the H-shaped steel strut;
d) Design temperature: t=200℃;
e) Design wind velocity pressure: q0=800 Pa, ground roughness is Category A;
f) Design seismic intensity: Intensity 8 (Category II site soil); design basic seismic acceleration: 0.2g.
1.3 This Part is not applicable to the vessels directly and rigidly connected with the machinery equipment generating pulsating loads through pipelines.
2 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this Part of JB/T 4712. For dated reference, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, the parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards. For undated references, the latest edition of the normative document referred to applies.
GB 150 Steel pressure vessels
GB/T 985 Basic forms and sizes of weld grooves for gas welding, manual arc welding and gas-shielded arc welding
GB/T 1804 General tolerances-tolerances for linear and angular dimensions without individual tolerance indications
GB/T 9787 Hot-rolled equal-leg angle steel-Dimensions, shape, weight and tolerances
GB/T 8163 Seamless steel tubes for liquid service
JB/T 4709 Welding Specification for Steel Pressure Vessels
YB 3301 The welded steel H-section
3 Type Characteristics
Type characteristics of leg supports are detailed in Table 1.
JB/T 4712.2-2007 The following standards are cited：
JB/T 4712.2-2007 Cited by the following standards：
