High level alarms.

When Table 1 refers to this section or requires a cargo to have a closed gauging system, the cargo's containment system must have a high level alarm: (a) That gives an audible and visual alarm before the tank fills to 97 percent of its capacity; (b) That can be seen and heard where cargo transfer is controlled and on the open deck; (c) Whose operation can be checked prior to each loading; and (d) That must be marked as described in § 153.408(c)(6) with the legend “HIGH LEVEL ALARM.” [CGD 78-128, 47 FR 21209, May 17, 1982; 47 FR 27293, June 24, 1982]