ABSTRACT

Saddles - th e B S 550 0 Approac h [5.1 ] 15 9 5.6.1 Longitudina l bendin g moment s 16 1 5.6.2 Longitudina l stresse s 16 3 5.6.3 Shearin g stres s 16 6 5.6.4 Circumferentia l stresse s fo r a vesse l no t stiffene d b y

rings 16 8 5.6.5 Stiffenin g ring s i n th e regio n o f th e saddle . 17 5 5.6.6 Force s o n th e saddl e 17 8 5.6.7 Rin g support s fo r horizonta l vessel s 18 0 5.6.8 Concludin g comment s 18 3

References 18 5

This chapte r deal s wit h th e influenc e o f loca l force s an d moment s on cylindrica l an d spherica l vessels . Thes e action s generall y aris e i n the vesse l suppor t regions , a t bracket s use d fo r ancillar y equipmen t o r at liftin g lugs . Whe n th e support , o r bracket , contac t are a i s relativel y small i t i s permissibl e t o assum e a simplifie d for m fo r th e interfac e force distributio n betwee n th e vesse l an d it s suppor t (o r bracket) . This approac h i s use d i n B S 550 0 Appendi x G l t o G2. 4 [5.1 ] an d th e W R C 10 7 [5.2] . However , whe n large r support s ar e necessar y - suc h as saddle s o n horizonta l vessel s - th e interfac e pressur e distributio n is mor e complicate d an d a comprehensiv e treatmen t i s required . An approac h t o thi s latte r cas e i s give n i n Appendi x G.3. 3 o f B S 550 0 [5.1].