Tube Data				Estimated Pressure Rating, psi, from -20F to 100F
				where P = S (D^2 - d^2) / (D^2 + d^2) for D/t < 10 & P = 2 S t / D for D/t > 10  Note, values are theoretical not all materials are available in each size and schedule.
Tube O.D. (In.) = D	Wall Thick (In.) = t	D/t	Tube I.D. (In.) = d	Carbon Steel, A106 B, smls, S = 15,000psi	304L SS, A312, smls,    S = 15,700psi	304L SS, A249, welded,    S = 13,300psi	6061 T6 Al, B241, smls,  S = 9,500psi	6061 T6 Al, B547, arc weld,  S = 6,000psi	Copper, C12200, S = 11,300psi