33 C.F.R. § 149.665

Each pumping platform complex must have a general alarm system that:

(a) Is capable of being manually activated by using alarm boxes;

(b) Is audible in all parts of the pumping platform complex, except in areas of high ambient noise levels where hearing protection is required under § 150.613 of this chapter; and

(c) Has a high intensity flashing light in areas where hearing protection is used.