Interlocking is the final barrier for a device – what do you think, Haiyou?
Thread Content
Interlocking is the final barrier for a device – what do you think, Haiyou?
It’s best not to resort to chaining things together when there’s still time to handle them; chaining should be used only as a last option
Interlock is a layer of safety protection that operates on top of process control. Under normal conditions, production is carried out under the control of the DCS system; however, when the DCS system is unable to keep production within the specified interlock limits, the interlock will activate, serving as the final barrier for process safety. But beyond the interlock protection, there is another physical protective barrier--------------safety valves, burst discs, etc., which represent the last line of defense for the installation.
Interlock is a layer of safety protection that operates on top of process control. Under normal conditions, production is carried out under the control of the DCS system; however, when the DCS system is unable to keep production within the specified interlock limits, the interlock will activate, serving as the final barrier for process safety. But beyond the interlock protection, there is another physical protective barrier--------------safety valves, burst discs, etc., which represent the last line of defense for the installation.
Safety valves are not necessarily reliable either; this has happened in our facility as well. The safety valve was designed to operate at a maximum pressure of 2.3 MPa, yet it failed to activate even when the pressure reached almost 4.0 MPa. Fortunately, someone arrived at the scene in time to open the bypass line of the safety valve in order to relieve the pressure, which resulted only in a tear in the heat exchanger’s head. Not long after the safety valve was replaced, it activated again before the pressure even reached the specified level – how terrifying.
One cannot rely solely on chains; human initiative must be fully utilized, and management systems need to be implemented earnestly
You’re amazing – 4.0 Mpa already! Who would still dare to go to the safety valve bypass line? What if the safety valve fails to activate again and something goes wrong with the equipment?