Top Pipe Moment
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Definitions : Hcol : Height of vessel (from bottom of anchorage to top tangent line) LR : Reference line (junction skirt / vessel) Elevation : Nozzle to LR distance Level : Elevation + height between bottom of anchorage and LR Elbow : Developped length of piping elbow with a radius of 1.5 x Ø piping Lsup : developped length of piping upper top tangent line ( = external height of head + projection of 300 mm + flange thickness + 200 mm + Elbow + 0.5 Ø ext. head + 200 mm + Elbow + 200 mm + flange thickness) In above figure : external height of head = 532 mm flange thickness = 30 mm Elbow = 643.2 mm Lsup = 532+300+30+200+643.2+1200+643.2+200+30 = 3778.4 mm Loads due to weight : Nozzles without piping : Weight pipe + weight flange + weight blind flange + 15 kg for davit Nozzles with piping : Head nozzle (Level > Hcol) : Weight flange + weight (Lsup/2) , applied at Hcol Weight flange + weight (Lsup/2) + weight (piping length = Hcol -1 m), applied at Hcol - 1 m Other nozzles : (Untitled) Page 1 mk:@MSITStore:C:\Progra... 7/23/2013 6:34:05 PM
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Calculating Moment For top nozzles on a pressure vessel head
Transcript of Top Pipe Moment
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Definitions : Hcol : Height of vessel (from bottom of anchorage to top tangent line) LR : Reference line (junction skirt / vessel) Elevation : Nozzle to LR distance Level : Elevation + height between bottom of anchorage and LR Elbow : Developped length of piping elbow with a radius of 1.5 x piping Lsup : developped length of piping upper top tangent line ( = external height of head + projection of 300 mm + flange thickness + 200 mm + Elbow + 0.5 ext. head + 200 mm + Elbow + 200 mm + flange thickness)
In above figure : external height of head = 532 mm flange thickness = 30 mm Elbow = 643.2 mm Lsup = 532+300+30+200+643.2+1200+643.2+200+30 = 3778.4 mm Loads due to weight : Nozzles without piping : Weight pipe + weight flange + weight blind flange + 15 kg for davit Nozzles with piping : Head nozzle (Level > Hcol) : Weight flange + weight (Lsup/2) , applied at Hcol Weight flange + weight (Lsup/2) + weight (piping length = Hcol -1 m), applied at Hcol - 1 m Other nozzles :
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Weight (piping length = Level - 1 m) + weight flange, applied at Level - 1 m Nota : Insulation weight, if any, is taken into account. Piping weight is based on calculated thickness due to internal pressure.. Loads due to wind : Definitions : Projected area : length x ( piping + insulation ) Load due to wind : Projected area x dynamic wind pressure x shape coefficient Nozzles with piping ( Level > 1 m ) : Head nozzle ( Level > Hcol ) : Load due to Lsup/2, applied at Hcol Load due to Lsup/2, applied at Hcol - 1 m Load due to Hcol -1 m equally distributed on each 15 m, applied from Hcol - 1 m. Other nozzles : Load due to piping length equal to Level - 1 m equally distributed on each 15 m, applied from Level - 1 m. Adopted loads : 2 loads applied at Hcol and Hcol - 1 m, which correspond at Lsup/2 with the greatest projected area. The wind loads which correspond at piping length with the greatest projected area. The piping are considered as superposed with the same orientation, the greatest is in front of the others from its Level..
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