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Issue 5 - September 2006
Page 32 of 65
5.4.2 Maintenance
Actions
Any maintenance actions specified to be carried out by Operations (eg lamp test) must be
carried out as specified and results logged.
5.4.3 Process Trips and Events
If during the course of normal operation a process trip or event that causes action by the safety
systems should occur, then all results must be logged and confirmation that the correct safety
action demanded occurred should be made.
Before restarting the process after an event, the plant safety supervisor must confirm that the
plant is safe to be re-started.
5.4.4 Maintenance
Engineering
Station
The TriBuild Maintenance Engineering Station should not be connected to the system during
normal operation.
5.5 System
Shutdown
The Safety System would normally only be shutdown during a planned major plant maintenance
cycle. During this period it is likely that both major equipment will be dismantled and serviced,
and possible process and system parameters modified.
If process and system parameters are to be modified, then Section 7, Maintenance and
Modification must be adhered to.
5.5.1 Process
Shutdown
Before the Triguard SC300E Safety System is shutdown the process must first be safely shut
down and the plant brought to a safe/neutral state.
This would normally require that all hazardous materials are removed and the process purged.
5.5.2 Triguard SC300E System Shutdown
The Triguard SC300E System Shutdown will be documented in the supplied bespoke
Operations and Maintenance Manual specific to the plant.
In principle, the following sequence of power down is followed: -
1) Remove power to main chassis.
2) Remove power to slave chassis.
3) Remove power to all fail-safe outputs, final elements and field sensors.
4) Turn off main panel power breakers.