29.H Firing.
29.H.01 Prior to the firing of a shot, all persons in the danger area must be warned of the blast and ordered to a safe distance from the area. Blasts must not be fired until it is certain that every person has retreated to a safe distance and no one remains in a dangerous location.
No person is allowed to enter the danger area.
29.H.02 Prior to the firing of a shot, a competent flag person must be posted at all access points to danger areas.
29.H.03 Prior to the firing of a shot, drill boats and other vessels must be moved a safe distance from the danger area.
- Prior to and while the drill boat or vessel is being moved from the danger area, a series of short signals by horn or whistle similar to the usual navigation warning signals must be given.
- The blast must not be fired while any vessel under way is closer than 1,500 ft (457.2 m) to the underwater blasting area. Those on board vessels or craft moored or anchored within 1,500 ft must be notified before a blast is fired.
- The blast must not be fired closer than 250 ft (76.2 m) to a boat or vessel containing an explosive magazine; personnel engaged in drilling operations on another drill boat within 500 ft (152.4 m) must leave the drill frames for cover if any holes have been loaded.
- The blast must not be fired while any swimming or diving is in progress near the blasting area.
- Whenever a drill boat is moved from the drilling setting, all loaded under water holes must be fired.
Knowledge Check Choose the best answer for the question.
29-11. When may vessels be located within the 1,500 ft (457.2 m) safe limit from underwater blasting?
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