De-Commissioning; Introduction; Final Process Shutdown; Dismantling And Removal - ABB Triguard SC300E Safety Manual

7

De-Commissioning

7.1 Introduction

All process plants eventually arrive at the end of their useful operational economic life.
Hazardous plants that normally would have a Triguard SC300E Safety Controller in operation
safeguarding the plant must be de-commissioned in a safe and environmentally friendly
manner.
Before de-commissioning or disposal activity can occur, an impact analysis shall be carried out
to assess the impact on the functional safety of the Triguard SC300E System and any adjacent
plant or processes that may still be in operation. The de-commissioning plan must fully take into
account the results of this analysis.

7.2 Final Process Shutdown

The operation and maintenance of the plant must be fully and professionally manned and
managed through the de-commissioning period.
The final process shutdown initially would emulate all previous major maintenance shutdowns in
the sequence of shutdown operation.
Once the plant is in its final safe state, all inflammable and hazardous material must be removed
from the plant safely and environmentally correctly disposed of or recycled into other operating
plants.
A full clean purge sequence must then be operated and the plant must be certified as fully safe
by the appropriate authority before power is finally removed from the safety system.

7.3 Dismantling and Removal

Before the dismantling and removal operation can occur the Triguard SC300E System and its
related field equipment must be fully electrically isolated.
7.3.1

Electronic and Electrical Modules

All electronic and electrical modules should be removed from the system and the parts removed
from the site by electrical and electronic disposals/recycling specialists.
7.3.2

Mechanical Items

The majority of mechanical items will be manufactured of steel and aluminium. These items
should be separated and disposed of through the appropriate recycling agency.
7.3.3

Safety Precautions

On no account should any Triguard SC300E Products or wiring be locally incinerated.
Issue 5 - September 2006
Page 39 of 65