PSI, Inc. (Professional Scuba Inspectors), also now known as PCI, Inc. (Professional Cylinder Inspectors, Inc.) or together as PSI-PCI, was formed in 1982. Affiliate cylinder inspector instructors are located in more than 10 countries. About 200 hands-on visual inspector courses, training over 2,000 students, are conducted each year. Training by correspondence is offered to technicians at international locations not served by PSI-PCI instructors.

PSI-PCI has a long history as the only agency for this training that is formally endorsed, utilized and referred to by the cylinder manufacturers; and recognized by law and rule making entities such as USDOT, TC and Compressed Gas Association.  We have consistently, and with integrity, served the diving (scuba), fire fighting (SCBA), hydro re-testing and other industries involved with high pressure cylinders providing the most current information available regarding cylinder inspection and safety.

Some of the customers that use PSI-PCI training include:

NASA         All Branches of the US Military      SeaWorld     

NOAA         Cylinder Manufacturers                   Disney         

SCUBA Shops around the world      Hydro-Requalifiers, and many more!

Inspection Cylinders coverPSI-PCI, Inc. founder William (Bill) L. High, a marine scientist living in greater Seattle, Washington, began diving in 1955 and has maintained a constant involvement with the many facets of underwater science, diver equipment, education and training. He led four extended saturation undersea laboratory teams (Tektite, Hydrolab, FLARE, Helgoland) and directed operations of five major deep submersible diving programs. He personally trained over 8,000 persons in basic or specialty diving skills and over 2,000 visual cylinder inspectors. He maintained a parallel career as a Emergency Medical Technician, Diving Medical Technician, hyperbaric chamber supervisor, and emergency room medic.

Bill High served as the first NOAA Diving Coordinator, Vice President of the Underwater Society of America, and President of the National Association of Underwater Instructors (NAUI). He is the recipient of numerous industry honors including NOGI Awards for Science, Sports and Distinguished Service, the Greenstone Award, PADI’s Outstanding Achievement Award, NAUI's Hall of Honor, NAUI Lifetime Achievement Award, DEMA's Reaching Out Award and International Diving Hall of Fame. Bill is the only living recipient of 3 NOGI awards!

Bill is a prolific writer and photographer, having published more than 150 scientific or technical articles, several books, and over 200 photographs. He is a major contributor to each edition of the NOAA Diving Manual. He has published 5 editions of the book Inspecting Cylinders, which is recognized as the authority on high pressure cylinder inspection!

Bill researched and developed the technical training program for inspection of selected high-pressure cylinders consulting with experts in the pertinent fields of study, metallurgy and closely with cylinder manufacturers. His devotion to life support cylinder safety influenced the gas industry throughout North America and at various international locations. The PSI-PCI, Inc. training is recognized by federal agencies, international governments, the U.S. Military, scuba instructors, fire industry associations, and cylinder manufacturers including Luxfer, Catalina, Pressed Steel Tanks, Structural Composites Inc, and Worthington.

Bill and MarkPSI-PCI continues today with owner Mark A. Gresham as CEO & President. Mark apprenticed with Bill for over 12 years prior to taking over the company upon Bill's "semi-retirement" and today is widely considered the world's foremost authority on cylinder inspection requirements and cylinder safety.

Mark is co-author with Bill on the 5th Ed. of Inspecting Cylinders.  He was instrumental in the development of the Oxygen Cylinder Cleaning Technician program working closely with industry experts throughout the process. He is also working closely with cylinder manufacturers to develop inspection standards of specific cylinders.

Mark teaches worldwide and can be counted on by PSI-PCI Inspectors to provide on the spot support with questions and consultations. He continues to work with the governing authorities and cylinder manufacturers to stay up to date and provide professional consultation with regard to high pressure cylinders. Mark is one of the strongest advocates for high pressure cylinder safety and training in the world today.

PSI-PCI, Inc. visual cylinder inspector courses exceed the training standards of the U.S. Department of Transportation (DOT), Occupational Safety and Health Administration (OSHA), Compressed Gas Association (CGA), and Transport Canada (TC). It meets compliance requirements for U.S. Hazardous Materials Training (high-pressure air and other gases are classified as hazardous materials) required of all employees exposed to the potential hazards of pressurized air.

PSI-PCI also has available the tools you need to do a proper cylinder inspection.

Persons seeking more information about cylinder inspections and fill station operational safety are invited to contact PSI-PCI, Inc. at This e-mail address is being protected from spambots. You need JavaScript enabled to view it. , U.S. telephone 425.398.4300 or fax 425.482.0160. Our hours of business operations are Monday through Friday, 9am - 5pm Eastern.  Mailing address:  1183 University Dr., Ste. 105-226, Burlington, NC 27215.

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