SATURATION CONTROL GAS MONITORING - SDA ROC MONITORThe SDA is used to determine the rate at which pressure is changing whilst saturation diving.
The SDA ROC is used on some of the world's most advanced diving systems including a new build vessel for the BP Exploration Shah Deniz II project in the Caspian Sea.
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To ensure diver safety it is essential to monitor and control the rate of change (ROC) of pressure to avoid hazardous rates of decompression. If the ROC is too high there is an increased risk of divers suffering the bends.
The SDA ROC monitor provides alarms that are based not on the depth level but on the rate at which the depth is changing.
The SDA ROC monitors the pressure of an occupied dive chamber and triggers an alarm if the rate of change is too high. It does this by sampling readings from a depth sensor and applying an algorithm to smooth the effects of any sudden changes. The SDA uses the readings to calculate the ROC value which it then compares against its pre-set alarm thresholds.
The SDA ROC sensor is attached to a habitation chamber, hyperbaric lifeboat or diving bell. To comply with DNV Offshore Standard 402, a digital interface is used between the sensor and the SDA. The ROC alarm constants can be changed to suit different chamber sizes and configurations. Two alarm thresholds can be selected: meters/feet of sea water per minute or meters/feet of sea water per hour.
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