Though history, numerous pressure vessels and hyperbaric chambers have been designed, tested, and used in an attempt to achieve a wide variety of results. However, not until the 1970s when the use of clinical HBOT started its regulation did the design and manufacturing of hyperbaric chambers also come under close inspection.
Today, chambers are classified in the United States by the National Fire Protection Agency as being one of three types: “Class A” – Human, multiple occupancy, “Class B” – Human, single occupancy, or “Class C” – animal, no human occupancy. The construction of all pressurized vessels is regulated and approved by the American Society of Mechanical Engineers (ASME) Boiler Plate and Vessel Code, Section 8, Division 1 and 2 to ensure that all materials, designs and constructions are cohesive with the code. All welding processes, procedures and materials must be in accordance with Section V of the code.
Chambers that are built without ASME certifications tend to not be used by the UMHS or any UMHS-approved training courses or hyperbaric clinics, nor will most insurance providers provide reimbursement to patients or physicians who have used them.