Okay.
Now, what I want you to understand at this stage and to keep in mind is that standards relevant to
safety valves vary quite considerably in format around the world, and many are sections within codes
relevant to boiler or pressure containing vessels.
Some standards will only outline performance requirements, tolerances and essential constructional
detail, but will give no guidance on dimensions or office sizes and so on.
Other standard will be related to installation and application only.
So it is quite common within many markets around the world to use several in conjunction with each other.
Some of the more commonly encountered codes and standards are listed in the following table.
Now.
Safety valves used in Europe are also subject to the European standards associated with the Pressure
Equipment Directive, more commonly known as BD being classified as safety accessories.
Safety valves are considered as category for equipment, which require the most demanding level of assessment
within the PPD standard.
This can usually be met by the manufacturer of the pressure relief valve.
Having an ISO 9000 quality system and the safety valve design and performance certified by officially
recognised approval authorities refer it to as notified body.
Approval.
Authorities will cover it in the next lesson.