62.25-20—Instrumentation, alarms, and centralized stations.
(a) General.
Minimum instrumentation and alarms required for specific types of automated vital systems are listed in Table 62.35-50.
(b) Instrumentation Location.
(1)
Manual control locations, including remote manual control and manual alternate control, must be provided with the instrumentation necessary for safe operation from that location.
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(2)
Systems with remote instrumentation must have provisions for the installation of instrumentation at the monitored system equipment.
(3)
The status of automatically or remotely controlled vital auxiliaries, power sources, switches, and valves must be visually indicated in the machinery spaces or the cognizant remote control location, as applicable.
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(4)
Sequential interlocks provided in control systems to ensure safe operation, such as boiler programing control or reversing of propulsion diesels, must have summary indicators in the machinery spaces and at the cognizant control location to show if the interlocks are satisfied.
(5)
Instrumentation listed in Table 62.35-50 must be of the continuous display type or the demand display type. Displays must be in the ECC or in the machinery spaces if an ECC is not provided.
(c) Instrumentation details.
Demand instrumentation displays must be clearly readable and immediately available to the operator.
(ii)
Fire, general alarm, CO2 /halon, vital machinery, flooding, engineers' assistance-needed, and non-vital alarms.
(2)
Required alarms in high ambient noise areas must be supplemented by visual means, such as rotating beacons, that are visible throughout these areas. Red beacons must only be used for general or fire alarm purposes.
(3)
Automatic transfer to required backup or redundant systems or power sources must be alarmed in the machinery spaces.
(4)
Flooding safety, fire, loss of power, and engineers' assistance-needed alarms extended from the machinery spaces to a remote location must not have a duty crewmember selector.
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(6)
Failure of an automatic control, remote control, or alarm system must be immediately alarmed in the machinery spaces and at the ECC, if provided.
(i)
Have a manual acknowledgement device (No other means to reduce or eliminate the annunciated signal may be provided except dimmers described in paragraph (g)(2) of this section);
(iv)
Provide for normal equipment starting and operating transients and vessel motions, as applicable, without actuating the alarm;
(vi)
Visually annunciate until the alarm is manually acknowledged and the alarm condition is cleared;
(ix)
Automatically reset to the normal operating condition only after the alarm has been manually acknowledged and the alarm condition is cleared.
(2)
Visual alarms must initially indicate the equipment or system malfunction without operator intervention.
(f) Summarized and grouped alarms.
Visual alarms at a control location that are summarized or grouped by function, system, or item of equipment must—
(2)
Have a display at the equipment or an appropriate control location to identify the specific alarm condition or location.
(i)
Be arranged to allow the operator to safely and efficiently communicate, control, and monitor the vital systems under normal and emergency conditions, with a minimum of operator confusion and distraction;
(iii)
Co-locate control devices and instrumentation to allow visual assessment of system response to control input.
(2)
Visual alarms and instruments on the navigating bridge must not interfere with the crew's vision. Dimmers must not eliminate visual indications.
(3)
Alarms and instrumentation at the main navigating bridge control location must be limited to those that require the attention or action of the officer on watch, are required by this chapter, or that would result in increased safety.