BS EN 13445-3-2009 非燃烧压力容器.设计

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BS EN 13445-3:2009 EN 13445-3:2009 (E) Issue 1 (2009-07)
13.4.2 Conditions of applicability 13.4.2.1 Tubesheet
The tubesheet shall comply with the following conditions of applicability. a) The tubesheet shall be flat, circular and of uniform thickness. b) A local reduction of thickness at the periphery of the tubesheet for a gasket groove or a relief groove is permitted, provided that the remaining analysis thickness, e a,p , is at least equal to 0,8 times the analysis thickness, e a , of the tubesheet (see Figure 13.4.2-1):
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d) Unless satisfactory experience has been demonstrated with thinner tubesheets, the following conditions shall be met when the tubes are expanded into the tubesheet: — when d t ≤ 25 mm:e a,p ≥ 0,8 ea(13.4.2-1)
The radius shall be not less than 5 mm and not less than 20 % of the adjacent shell thickness. The requirement for the remaining analysis thickness given above shall apply only if the ratio of the outside diameter to inside diameter of the adjacent shell is larger than 1,2.
ea,p
ea
ea,p ea
a) Configuration a
b) Configuration b and e
ea,p ea
ea,p ea
c) Configuration d
d) Configuration c and f
Figure 13.4.2-1 ⎯ Local reduction of thickness at tubesheet periphery c) When the tubesheet is extended as a flange, the flange extension thickness shall be calculated according to: ⎯ ⎯ 13.10 if the gasket is narrow (configurations b, d2, e); 13.11 if the gasket is full face (configurations b', d '2 , e').