1. Tubing Calculations Allowable Pressure as a function of Diameter

2. Where: Test pressure shall be determined by Barlow's equation for thin hollow cylinders under tension. Where: Pinternal pressure (psi) tTube wall thickness (inch) SAllowable tensile strength in tube wall (psi) DTube outer diameter (inch)

3. %Jared Foley %Green Machine Transmission %11/21/08 dmat=[1/4; 3/8; 1/2]; %outter diameter of tubing (ihch) t=[0.035; 0.035; 0.035]; %tubing wall thickness (inch) S= 52939; %allowable tensile strength in wall (psi) P=((2*S).*t)./dmat; %allowable pressure of tube (psi) fprintf('Allowable pressure for %3.2f inch is %10.2f psi\n', dmat(1,1), P(1,1)); fprintf('Allowable pressure for %3.2f inch is %10.2f psi\n', dmat(2,1), P(2,1)); fprintf('Allowable pressure for %3.2f inch is %10.2f psi\n', dmat(3,1), P(3,1)); figure plot(dmat,P); title('Tubing Diameter vs. Allowable Pressure'); ylabel('Pressure (psi)') xlabel('Tubing Diameter (inch)') MATLAB Tubing Allowable Pressure Calculations

4. Allowable pressure for 0.25 inch is 14822.92 psi Allowable pressure for 0.38 inch is 9881.95 psi Allowable pressure for 0.50 inch is 7411.46 psi Calculation results

5. Pressure vs. Tubing Diameter