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5.1.1 Design pressure of equipment shall be determined in accordance with the following requirements：
1 The design pressure of the equipment subjected to internal pressure shall be the maximum set pressure at the top of the equipment，considering corresponding design temperature，and the value shall not be lower than the working pressure；
2 The design pressure of the external pressure equipment shall be not less than the maximum internal and external pressure difference generated at any time during normal working，and shall not exceed 0.1MPa；
3 The design pressure of the vacuum equipment shall be 0.1MPa.
5.1.2 The design pressure used in the calculations for the equipment shall be the pressure used to determine the thickness of the equipment components at the corresponding design temperature and shall include additional loads such as liquid column pressure.
5.1.3 The equipment design temperature shall be the highest or lowest operating temperature of the equipment set under normal working conditions.
5.1.4 The equipment design shall include the calculation of the strength of cylinders and heads，the secondary bonding，cut-outs and compensation，the connection structure of branches and other components，bolt connection，saddle and the support structures.
5.1.5 The equipment design can adopt rule design method，analysis design method，and test verification design method.For rule design method and analytical design method，the design factor shall not be less than 6.0，and the buckling factor shall not be less than 4.0.For test verification design method，the failure pressure shall not be less than 6 times the design pressure.
5.1.6 The layering design of the equipment shall include the type of fibre and product，the resin system and mix ratio，the order，direction and number of layers，the forming and curing process，the resin or fibre content and tolerance.
5.1.7 The wall of the equipment consists of a lining，a structural layer and an outer surface，and shall be in accordance with the following requirements：
1 The lining shall be composed of the inner surface layer and the barrier layer，and the thickness shall not be less than 2.5 mm，and shall be in accordance with the following requirements：
1）The inner surface layer shall be made of surface veil，the resin content shall be greater than 85％，and the thickness shall not be less than 0.3 mm；
2）The barrier layer should be chopped strand mat，woven fabrics，and gun roving.The resin content shall not be lower than 65％.
2 The structural layer may be a combination of single or several reinforcing materials such as winding filament，chopped strand mat，woven fabrics，gun roving，woven roving，etc.，which may be formed by winding，spraying and hand lay-up，and shall be in accordance with the following requirements：
1）The thickness of the structural layer shall be determined by calculation；
2）When the structural layer is made of glass fibre，its content shall meet the requirement of Article 4.3.1（4）of this code.
3 The design of the outer surface shall be in accordance with the following requirements：
1）In corrosive environment，the surface veil shall be used and the resin content shall not be lower than 85％；
2）When required to prevent UV，the resin used shall be added with UV absorbent；
3）The outermost layer of the outer surface layer shall be air-resistant resin or gelcoat resin；
4）The thickness of the outer surface layer should not be less than 0.3mm.
5.1.8 The thickness of the lining and the outer surface shall not be included in strength calculation；the total thickness shall be used in calculating the external pressure stability and the self-weight load.
5.1.9 When the steel annular support is bonded to the housing to form a rigid support，the operating temperature of the equipment should not be more than 60℃.