Section 6 Instrumentation, control, alarm and monitoring

6.1 Functional objectives

6.1.1 The regasification plant and sub-systems shall be provided with appropriate controls for safe operation of the regasification system with adequate alerts and safeguards.

6.2 Performance requirements

6.2.1 Instrumentation, control, alarm and monitoring systems shall comply with the requirements of this Section and Pt 6 Control and Electrical Engineering.

6.2.2 The system shall be provided with automatic and/or remote controls to ensure the system operates within its design parameters.

6.2.3 A system for monitoring and indicating alerts shall be provided.

6.2.4 The system shall be provided with safeguards such as a high pressure trip, which will operate to prevent a hazard occurring or to reduce an existing hazard to persons, machinery, the barge or offshore unit or the environment.

6.2.5 Locations at which the regasification system is controlled shall be provided with a means of communication with the gas-receiving terminal.

6.2.6 The regasification system shall be provided with control, monitoring, alert and safety systems that will maintain the system throughout all normal and reasonably foreseeable abnormal conditions.

6.2.7 The system shall be provided with the alarms and shutdowns as identified by the system designer or equipment manufacturer. In the absence of such guidance, the alarms and shutdowns indicated in these Rules may be used.

6.3 Control station

6.3.1 A control station for the regasification system and barge or offshore unit-to-ship operations shall be arranged within a non-hazardous area. Emergency procedures, as defined in Pt 11, Ch 20, 3 Risk based analysis, concerning regasification and barge or offshore unit-to-ship transfer operations shall be capable of being performed from this station.

6.4 Communications

6.4.1 At least two means of communication shall be provided between the control station and the receiving terminal; one of these systems shall be independent of the main electrical supply.

6.4.2 Internal communication cables shall comply with the applicable requirements of these Rules.

6.4.3 The cable installation shall provide adequate protection against mechanical damage and electromagnetic interference.

6.4.4 Components shall be located with appropriate segregation such that the risk of mechanical damage or electromagnetic interference resulting in the loss of both active and stand-by components is minimised. Duplicated communication links and equipment shall be routed to give as much physical separation as is practicable.

6.5 Equipment and systems – Alarms, shutdowns and safeguards

6.5.1 Suitable interlocks shall be provided to prevent start-up of the regasification system under conditions which could hazard the system or its equipment and components.

6.5.2 The system designer or equipment manufacturer shall identify the required alarms, shutdowns and safeguards for the design of vaporiser. The minimum shutdown requirements are indicated in Table 20.6.1 Alarms, shutdowns and safeguards for vaporisers.

6.5.3 The system designer or equipment manufacturer shall identify required alarms, shutdowns and safeguards for the suction drum. The minimum shutdowns requirements are indicated in Table 20.6.2 Alarms, shutdowns and safeguards for suction drums.

6.5.4 The control and monitoring arrangements shall be appropriate to enable the system to be controlled within the design parameters specified by the system designer or equipment manufacturer.

Table 20.6.1 Alarms, shutdowns and safeguards for vaporisers

Item	Alarm	Note
Gas discharge temperature	Very Low	Automatic shutdown
Sea-water (or heating medium) supply pressure	Very Low	Automatic shutdown
Indication of supply gas pressure to burner (SCV type)	Very Low	Automatic shutdown
Flame failure (SCV type)	Failure	Automatic shutdown
Indication of sump water level (SCV type)	Very Low	Automatic shutdown
Combustion air pressure (SCV type)	Low	Automatic shutdown
Combustion air pressure (SCV type)	High	Automatic shutdown
Flue gas temperature (SCV type)	High	Automatic shutdown
Gas leak detected		ESD operation (programmed)
NOTES 1. SCV type means submerged combustion vaporiser type. 2. Any additional alarms and shutdowns identified during the Risk Assessment required in Section Pt 11, Ch 20, 3 Risk based analysis are also to be provided. 3. The Table contains the minimum list of alarms and shutdowns for a regasification plant; additional alarms and shutdowns may be necessary as determined through risk-mitigating activities in response to a completed Risk Assessment as required by Section Pt 11, Ch 20, 3 Risk based analysis. 4. If certain alarms and shutdowns are not applicable for the regasification system, sufficient evidence shall be produced to support the claim and shall form part of the Risk Assessment required by Pt 11, Ch 20, 3 Risk based analysis.

Table 20.6.2 Alarms, shutdowns and safeguards for suction drums

Item	Alarm	Note
Suction drum pressure	Low	Automatic shutdown
Suction drum level	Very low	Automatic shutdown
Suction drum level	Very high	Automatic shutdown
NOTES 1. Any additional alarms and shutdowns identified during the Risk Assessment required by Pt 11, Ch 20, 3 Risk based analysis are also to be provided. 2. The Table contains the minimum list of alarms and shutdowns for a regasification plant; additional alarms and shutdowns may be necessary, as determined through risk-mitigating activities in response to a completed Risk Assessment as required by Pt 11, Ch 20, 3 Risk based analysis. 3. If certain alarms and shutdowns are not applicable for the regasification system, sufficient evidence shall be produced and is to form part of the Risk Assessment required by Pt 11, Ch 20, 3 Risk based analysis.