Chapter 16. Pressure Vessel Safety

I. Pressure vessels are large metallic containers used to contain liquids and gases at various temperatures and pressures.

A. Pressure vessels come in various shapes and sizes, ranging from small and simple air compressor tanks to large and complex reaction vessels.

B. Pressure or storage vessels should be designed and constructed according to the American Society of Mechanical Engineers Boiler and Pressure code (ASME code) or the American Petroleum Institute (API) standard 620. All pressure or storage vessels should be marked with the official ASME stamp or the API standard 620 stamp.

C. Manufacturers instructions should be followed at all times with respect to maintenance and care of the pressure vessels.

D. Unless otherwise specified, pressure vessels should be inspected for corrosion, cracking, or other details of wear at least every ten years for vessels in good shape. Re-inspection within one year for repaired vessels, one to two years for vessels with cracks but unrepaired, and three to five years for vessels free of cracks. Inspections should be carried out by National Board of Boiler and Pressure Vessel Inspectors.

E. At no time should modifications of the pressure vessel be carried out except by the manufacturer or by someone authorized by the manufacturer. After modification the pressure vessel should be inspected under the National Board inspection code.