Scuba Tank Markings – Everything You Need To Know About Them

We know you have noticed the scuba tank markings. You have told us and you have asked us what their meaning is. In this article, we are going to explain them to you. You will know how the tank pressure is indicated, when the last annual inspection was carried out, and when the next one will be, among many other things. Are you ready to discover the scuba tank markings mystery? Let’s get started!

Deciphering Scuba Tank Markings

Scuba Tank Markings to Identify the Government Approval

Government approval often has codes like.

DOT: Scuba tanks marketed in the United States must be homologated according to the regulations of the corresponding Department Of Transportation (DOT)

CTC: These are the initials of the Canadian Transportation Commission (CTC or TC), the government agency that approves bottles in Canada.

CE: These scuba tanks follow the requirements of the European Union and must be approved according to EN standards.

Scuba Tank Markings to Indicate Work Pressure

PSI is the unit of pressure measurement used in USA, while Canada and the European Union use BAR. If you want to know the difference, we have an article that explains ” What’s The Difference Between Psi And Bar?“, we recommend carefully reading.

Well, the Scuba Tank Markings that follow the identification of the metal are numbers. They indicate the working pressure of the tank. In other words, the maximum pressure that the tank can be filled to (3000 PSI or 207 BAR). This pressure must not be exceeded unless the + sign appears next to the number. If you see this, you are generally looking at a steel tank and it indicates that it can be filled up to 10% more.