Snowden's use British Engineering Services for third party approval of compliance with ASME and CE requirements in the design and build of their pressure vessels.

The American Society Of Mechanical Engineers (ASME) provides over 600 specific codes and standards for mechanical devices. The ASME Boiler and Pressure Vessel Code (BPVC) is the largest standard and provides the necessary rules for the design, fabrication and inspection of boilers and pressure vessels in the industry and is reviewed every 3 years.

Edwin Snowden manufacture in accordance with Section VIII of the ASME BPVC Boiler and Pressure Vessel Code which focuses on Pressure Vessels. It applies to the materials and fabrication methods such as welding, forging, and brazing and covers specialised areas including design, fabrication, inspection, and testing methods.