Hazops; Design; Verification And Validation; Installation And Commissioning - ABB Triguard SC300E Safety Manual

Verification should be completed and documented that the logic changes required and only
those changes required has been implemented. Before and after ladder listings and compare
facilities should be used.
Verification using the register and discreet cross-reference that no double use of registers or
discretes has occurred should be completed and documented.
Providing the results from the above verification are positive, then only the implemented
changes need to be tested before they are finally brought on-line.
For all extensive changes the following procedures must always be followed.
6.2.9

HAZOPS

The required modification must be subjected to a full Hazard Analysis (Hazard and Operability
Study) including all possible effects on the unchanged parts of the system.

6.2.10 Design

The modification design must follow the same full life cycle process as the original design
described in Section 4.

6.2.11 Verification and Validation

Full off-line verification and validation, as described in Section 4 both for Hardware and
Application Software, must be completed prior to installation.

6.2.12 Installation and Commissioning

All safety aspects given in Section 5 of this manual must be adopted during the installation and
commissioning phase of a modification.

6.2.13 Acceptance Test Validation

A system validation (cause and effect test) will be implemented for the modified parts of the
systems prior to bringing the modified parts of the system on-line.

6.2.14 Personnel

Only personnel with the correct level of training and expertise, both in safety and process
knowledge, will be authorised to implement system modifications.

6.3 Training

All maintenance staff that are required to work on the Safety System will complete a one week
maintenance training course and will attend refresher courses every 24 months.
All maintenance staff that are required to perform modifications to an installed Triguard SC300E
Safety System will attend an additional one week course on Triguard SC300E System
Engineering prior to the implementation of the system modifications.

6.4 Security

All system cabinets are fitted with keylocks to enable "permit to work" controlled access to the
SC300E Safety System.
The TriBuild maintenance workstation is provided with multi-level password protection to ensure
only qualified maintenance staff has access to the Triguard SC300E Safety System.
Issue 5 - September 2006
Page 37 of 65