We have to design a manual plunger water hydraulic pump, but the wall thickness of the cylinder will not be designed and checked. I follow the sigma delta is not less than PD/2[design is out of 10mm thick, but the teacher said 5mm can withstand the pressure of 150MPa, the material with corrosion resistant stainless steel can. Some of my parameters are the maximum cylinder pressure 140MPa, cylinder size d=18mm (can also be smaller), length 60 ~ 80mm, how can I design wall thickness? thank you very much indeed
The maximum allowable internal pressure [P] formula for a thick walled tube: [P] = [sigma] (K^2-1) / (K^0.5, K^2): K=D/dAccording to the latter company, you can count it back.
The maximum permissible bearing pressure in the thin-walled tube [P] formula: [P]] =2[sigma phi S (D / S) in the formula: [Sigma - material allowable stress; coefficient of weld - diameter, seamless tube, pipe wall thickness with =1; S-- d--; the inner diameter of the pipe.
Thick wall steel tube branch pipes and thin-wall pipes, the different calculation of bearing pressure in the formula, K=D/d = 1.2, the tube called a thin-walled tube; K=D/d>1.2 tube called thick wall pipe.
