This standard specifies the design, manufacture, inspection and acceptance requirements of nickel and nickel alloy pressure vessels; the nickel and nickel alloy atmospheric pressure vessels may also refer to this standard.
1.1 This standard is applicable to the vessels with design pressure no larger than 35MPa.
1.2 The design temperature scope applicable to this standard shall de determined according to the permissible application temperature of nickel and nickel alloy and clad steel plate. The design temperature applicable to nickel and nickel alloy clad vessels shall not only respectively consider permissible application temperature of nickel and nickel alloy liners and steel shell layer material, but also consider the difference of elasticity modulus of liners and shell layer material.
1.3 The following vessels are not included in the scope of this standard:
a) Directly-fired vessels;
b) Vessels in the nuclear-energy plant;
c) Compression vessel chambers as the component parts of such motive mechanical equipments with rotation or reciprocation (such as centrifugal pump shell, cylinder body of reciprocating pump, cylinder body of compressor, cylinder body of refrigerating machine, case of blower, rotating drum of centrifuge);
d) Frequently-transported vessels;
e) Vessels with internal diameter less than 150mm (means width, height or diagonal line for the noncircular section, means the diagonal line for rectangular or the major axis for ellipse);
f) Vessels requiring fatigue analysis.
1.4 For the compression components with structural dimension not being determined by using this standard, the following methods may be adopted in the design of these compression components, but they shall be evaluated and approved by the National Technical Committee on Pressure Vessels of Standardization Administration of China:
a) Stress analysis, including finite element method;
b) Replication experiment analysis (such as experimental stress analysis and replication hydraulic pressure test);
c) Comparison empirical design by using such comparable structures that have been in service.
