BS EN 14276-2:2020 pdf free download – Pressure equipment for refrigerating systems and heat pumps Part 2: Piping一General requirements.
For other material than steel group 1.1, 1.2 or 8.1, applicable requirements of EN 142 76-1:2020, 6.11 shall apply.
The extent of non-destructive testing and applicable methods other than visual testing of steel welded joints are specified in EN 14276-1:2020, 8.7.
When there are no governing joints, testing group is 4 with a value of z is 1,0 for the purpose of calculation.
6.7 Design stress
The value of design stress shall take into account the design and tests conditions. The requirements of EN 14276-1:2020, 6.12 shall apply when the materials are not subjected to creep. When materials are subjected to creep, all requirements of EN 13480-3:20 17 shall apply.
The values of yield and tensile strength of the material shall be those which apply to the materials in the final fabricated condition, and shall conform to the values given in the appropriate design specification. These values can be used for design purposes unless heat treatment is known to lead to lower values.
For metallic material, the value at 20 °C may be used for temperatures up to and including 50 °C. If the weld or brazed metal gives lower strength values after fabrication, then these values shall be used instead.
When assessing exceptional conditions (e.g. vacuum —1 bar), the design stress shall be taken for the test condition with the temperature of material taken to be that existing at the exceptional condition. The design stresses shall be in accordance with Table 5 and Table 6 of EN 14276-1:2020.
6.8 Access and inspection openings, venting and draining provisions, filling and discharge provisions and handling devices
6.8.1 Access and inspection openings
No provisions are required for access and inspection openings other than the connections used on the piping. In case of corrosive fluids, the manufacturer shall indicate in the instruction documentation, the recommended periodic inspection schedule and methods.
6.8.2 Venting and draining provisions
The design of the piping shall ensure provision for adequate venting of air during the pressure test and draining of the test fluid after the hydraulic test.
6.8.3 Filling and discharge provisions
The provision given in EN 378-2:2016, EN 378-3:2016 and EN 378-4:2016 shall apply to prevent the risk of refrigerant emission during the filling or discharging of the refrigerating system.
If the piping is used for refrigerant storage, the documentation shall recommend the maximum liquid level and the use of safety accessories to avoid any over-pressure.
6.8.4 Handling devices
For piping, there is no requirement for additional handling devices.
6.9 Design methods.