Shutoff valves shall be installed on the connection to which kind of vessel?

Shutoff valves are critical components that provide a means of controlling the flow of air or fluid within a system, especially when it comes to safety and maintenance. In the context of mechanical systems, the correct installation of shutoff valves is particularly important for pressure vessels.

Pressure vessels operate under high pressure and can contain gaseous or liquid substances that may be hazardous. By having shutoff valves installed on the connections to these vessels, it allows for the safe isolation of the vessel from the system. This capability is crucial for maintenance and emergency situations, as it helps to prevent accidental release of pressurized contents and protects both personnel and equipment.

When maintenance personnel need to perform work on a pressure vessel, the ability to quickly shut off the flow simplifies the task and enhances safety. This consideration is also informed by various standards and codes, which emphasize the need for proper isolation in systems involving pressure vessels.

In comparison, while shutoff valves may also be important for storage tanks, ventilation units, and heating elements, the specific requirement for shutoff valves to be installed on pressure vessels is driven by the unique safety concerns associated with the high pressures they handle. Thus, the focus on pressure vessels underscores the code's priority on safety and operational reliability in mechanical systems.