That opportunity has already passed when the NFL is exceeded. The high alarm should never be used as an alert or notification that the level is too high. Therefore, if an operator wants to be notified when the level exceeds the NFL it can us an ‘alert’, which is not within the scope of API 2350.ĭifferentiating between alerts and alarms will be an important cultural shift in some organisations. API 2350 enforces the principle that an alarm is actionable, must be procedure driven and is always to be considered an emergency. Take note that API 2350 does not address the requirements for alarms at the normal maximum fill level (NFL). The other levels such as OD and NFL must still be determined but they are just elevations no physical sensor or equipment is needed at these levels. Obviously, alarms must be initiated using sensors which are shown in Figure 3. However, when used, the LAHH or second alarm must then meet all the rules specified in API 2350. So, the use of a second alarm (LAHH) is optional. The owner operator must ensure that their alarm system is engineered to be highly reliable. For these reasons, API 2350 allows for a single alarm. Today however, alarm systems can be incredibly reliable. Historically, two alarms were required because the alarms were so unreliable. It has been demonstrated that adding more alarms does not necessarily improve operator performance. API 2350 now requires only one alarm level. Regular practice tends for most owner/operators to use an LAH and LAHH. It is defined as overfill, damage, or any other problem associated with a too high liquid level as specified by the operator/owner. OD is the liquid level we never want to reach. MANAGEMENT SYSTEM PRACTICESĪ key step in OPP is to establish LOCs(levels of concern) as shown in Figure 3. In the second of a two-part article series, Philip Myers and Brock Trotter of PEMY Consulting review the 4th and 5th editions of API 2350 and how it affects overfill standards.
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