How do you calculate volume in megapascal liters for cylinders?

First thing, megapsacal litres is a unit of capacity, not volume.

To calculate the capacity of a cylinder you first need to know the volume (in litres). Volume = py (3.14159) multiplied by r2, multiplied by the height (or length whatever the case may be).

Capacity is then obtained by multiplying

the internal volume of the vessel (in litres, L) by the design pressure (in

megapascals, MPa). That is:

Capacity (MPaL) = design pressure (MPa) x volume (L)

To convert pressure in pounds per square inch (psi) to Mpa:

1 megapascal = 1000 kilopascals (kPa)

1 psi = 6.89 kPa

Therefore, if design pressure is provided in psi then:

design pressure (in Mpa) = design pressure (in psi) x 0.00689

Example:

Assume your air receiver has a volume of 140 litres, with a design pressure of 160 psi.

design pressure (MPa) = 160 x 0.00689 = 1.100 MPa (1,100kPa)

Capacity = 1.100 x 140 = 154 MPaL