Air velocity is a function of air density and differential pressure, but determining air flow requires that the geometry of the piping be taken into account. Medium- and High-Pressure Tubing Cone and Thread Tubing - IPT Series Swagelok offers cold-drawn 316 stainless steel, nominal OD, medium-pressure tubing with working pressures up to 20 000 psig (1378 bar) for use with medium-pressure fittings, as well as high-pressure tubing rated up to 60 000 psig (4134 bar) for use with high-pressure fittings. Anton Medium Pressure Gauge Hose Kit Part number: 19289. Easy online ordering and next-day delivery available with 24/7 expert product support. How to Bend Pipe. However, the Plastics Pipe Institute does not recommend pneumatic pressure testing of an above-ground installation, for which the test should be conducted hydrostatically, using a non-hazardous liquid such as water.