Simple pressure vessel safety technical supervision procedures (2)
Release time：2018-09-17 Browse：510
Article 14; design documents for simple pressure vessels should have any of A1, A2, C, D1 or D2 A pressure vessel design qualification.
Article 15 The design of a simple pressure vessel should include the following:
(1) design drawings;
(2) Design calculations, including at least volume calculation, strength calculation, recommended service life, safety relief calculation, safety valve displacement or rupture disc Vent area calculation and other content;
(3) Design specification, including at least the selection basis of design parameters, selection of materials, selection of accessories, main production process requirements, inspection requirements, etc. ;
(4) Instruction manual, including at least the highest working pressure, maximum working temperature, volume, specified use, installation requirements, recommended service life, and safe maintenance Points and other content.
At least sixteen simple pressure vessels are designed on the general plan:
(1) The specification and standard name on which to base;
(b) Pressure vessel name;
(3) Major pressure component material grades and material requirements;
(d) design conditions, including design temperature, design pressure, maximum working pressure, recommended service life, medium, corrosion allowance, etc.;
(5) Main characteristic parameters, including volume, total weight, etc.;
(six) welding methods and requirements;
(7) Anti-corrosion requirements (if necessary);
(8) Pressure test requirements, including test pressure, media, etc.;
(9) Radiation testing or blasting test requirements;
(10) Specifications for security accessories and special requirements for ordering;
(11) Nameplate style (see attachment) and location;
(12) Transport packaging and installation requirements (if necessary);
(13) Other special requirements.
Article 17 Simple pressure vessel butt welded joints shall be full penetration welded joints.
Article 18 The wall thickness of the main pressure-bearing components of simple pressure vessels shall be determined by test methods or calculation methods.
The actual wall thickness after the shell is formed, the simple pressure vessel made of austenitic stainless steel should be no less than 1mm, and the simple pressure vessel made of carbon steel should not Less than 2mm.
Article 19 When determining the wall thickness of the main pressure-receiving element by test method, the bursting pressure at room temperature shall not be less than 5 times the design pressure. And the circumferential permanent deformation rate should not be less than 1%.
Article 20 When calculating the wall thickness of the main stressed component by calculation, the following requirements should be met:
(1) The design pressure must not be lower than the maximum working pressure. The simple pressure vessel with safety relief device should not be designed to be lower than the safety valve. Opening pressure or burst pressure of the rupture disc;
(2) The total film stress allowed is less than or equal to 0.6Rpa2 (0.6Rpa2 is the lower limit of the yield strength of the material at room temperature) or 0.3Rm (Rm is the lower limit of the tensile strength of the material at room temperature;
(c) If the barrel of the container has one or more longitudinal welded joints that are not automatically welded, the calculated thickness should be increased by 15%.
manufacturing
The 21st simple pressure vessel manufacturing unit shall have any one of A1, A2, C, D1 or D2 Manufacture qualification for containers.
Article 22 Simple pressure vessel manufacturing units shall take effective measures to ensure that the production process is stable and that the safety of the simple pressure vessel manufactured is Product quality is responsible.
Article 23 Personnel engaged in the welding and non-destructive testing of simple pressure vessels shall obtain the certificate of the special equipment operator of the corresponding project in accordance with the regulations. Engage in the corresponding work.
Article 24 The welding procedure qualification of simple pressure vessels shall meet the requirements of the corresponding standards.
The tensile strength of the twenty-fifth welded joint shall not be lower than the lower limit of the tensile strength of the base metal, and shall not endanger the safety of simple pressure vessels. Defects.
