BS/EN 13445-8-2014 pdf download.Unfired pressure vessels Part 8: Additional requirements for pressure vessels of aluminium and aluminium alloys.
5.4 Lamellar tearing
NOTE Also see EN 13445-2:2014, 42t2.
Specific requirements of lamellar tearing for pressure vessels of aluminium ana 115 alloys are not appucaole.
5.5 Chemical composition
The chemical composition shall be in accordance with the material specification.
It is recommended that the material to be used for welded components be produced from rolling or extrusion ingots with hydrogen level no greater than 0,2 ml per 1009 aluminium, measured on liquid metal during casting (see
EN 12392:2000. 5.1.3).
EN 12392:2000, 41. recommends a maximum lead content not exceeding 150 pg/g
5.6 Material grouping system
Annex A of EN 13445-2:2009 is not applicable for pressure vessels of aluminium and its alloys. The allowable materials for the construction of aluminium alloy pressure vessels shall be according to Table 5.6-1 below.
Any product form available in EN 12392:2000 for a material in Table 5.6-1 at an acceptable temper is acceptable for construction to this European Standard, as long as the requirements of 5.2 and 5.5 are fulfilled. Other materials not defined here may be used by agreement by the parties concerned (see EN 13445-2:2009, 4.1.4) if they meet the requirements of 5.2 and 5.5 and a particular material appraisal is produced (see EN 764-4:2002).
6 Design
6.1 General
The requirements of EN 13445-3:2u14 snaii apply wan me following aclgltionslexcluslons.
6.2 Design temperature and properties
NOTE I Also see EN 13445-2:2009. 4.2.2.
EN 13445-2:2009, 4.2.2.1, 2nd paragraph, is not applicable for aluminium and its alloys.
Design strength values are given in Tables A.2 to A.5 in Annex A. Design temperatures that exceed the respective temperature limit in Annex A are not permitted.
For materials of group 22.4 temperatures above 80 C may result in grain boundary precipitation of A13-Mg2. These materials may be used at temperatures above 80 C up to 200 C only for non-corrosive service.
NOTE 2 For further matenal properties see EN 12392:2000.
For welded parts and heat treated parts after forming only the values equivalent to the 0 temper shall be used for design when 6 000 series flanges, etc. are Welded. These values are not quoted in EN 12392:2000 and so the tabulated values for f shown in Table 6.3-2 shall be used for design. The weld area shall be based on the 0 temper but the flange strength away from the weld (2t) may be based on the actual temper (T4 or T6).
For aluminium and aluminium alloys values of 0,2 % proof stress (or I % proof stress for material group 21-1 000 series aluminium) for temperatures above 20 C shall be established by linear interpolation between two adjacent values in Annex A or in EN 12392:2000 except that for alloys 5083 and 5086 the respective value at 50 °C may be used for 65 °C.
For material of group 22.4: For short periods. higher temperatures (e.g. when defrosting refrigerating plant) up to 150 C are permissible provided that the pressure is reduced to half the working pressure for a period up to 8 h and to atmospheric pressure for a period up to 24 h.
6.3 Time-independent nominal design stress
6.5 Fatigue design
Fatigue design for over 500 full equivalent pressure cydes is not covered by this Part 8 for aluminium and aluminium alloy pressure vessels, Fo the determination of 500 full equivalent pressure cycles see
EN 13445-3:2009. 5.4.2
NOTE This will be subject to a future revision of or an amendment to this Part 8.
6.6 Lapped joints, joggle joints, permanent backing strips
6.6.1 General
The requirements of 5.7.4 in EN 13445-3:2014 are not applicable for pressure vessels of aluminium and aluminium
alloys, and 5.7.4,1 5.7.4.2. and 5.7.4.3.1 shall be replaced with the following 6.6.2. 6.6.3. and 6.6.4, respectively.
6.6.2 Lapped joints
Lapped joints with fillet welds shall be used only when all of the following conditions are fulfilled:
a) only testing group 4 is permitted:
b) the materials are limited to material groups 21, 22.1, 22.2. 22.3,22.4:
C) for circumferential joints of shell to head only:
d) the nominal wall thickness of the thickest pressure part does not exceed 8 mm;
e) the overlap shall be minimum 4c. where c represents the nominal thickness of the thickest pressure part;
1) both sides of the lap are welded:
g) the maximum vessel diameter does not exceed 1 600 mm;
h) non-corrosive conditions only are permitted.
6.6.3 Joggle joints
Joggle joints shall be used only when all of the following conditions are fulfilled:
a) the matenals are limited to material groups 21, 22.1, 22.2. 22.3. and 22.4 (except 5454);
b) for circumferential joints of shell to head only;BS/EN 13445-8-2014 pdf download.