19.I Navigation Locks and Vessel Locking.
19.I.01 Smoking, open flames, or other ignition sources must be prohibited on lock structures within 50 ft (15.2 m) of vessels containing hazardous cargos of flammable or other hazardous materials ("Red Flag" vessels) during approach and lockage.
- When construction, maintenance, and other non-navigational related activities are taking place on or adjacent to the lock structure, the Lock Master will relay information to supervisory personnel in these activities regarding the approach and passage of Red Flag vessels.
- The Lock Master or Work Crew supervisor may suspend hot work at their discretion during the approach and passage of Red Flag vessels.
- Prior to the start of work on these activities, the Work Crew Supervisor will establish safe zones that maintain at least the minimum 50 ft (15.2 m) required distance between Red Flag vessels and sources of ignition such as hot work and smoking areas.
- (1) The minimum distance must be calculated vertically and horizontally throughout a lock chamber when the chamber is pumped out for maintenance.
- (2) These zones must be marked, barricaded, or otherwise designated so personnel can easily distinguish them.
- (3) The location of and restricted activities within these zones must be included in the activity AHA and discussed with workers prior to start of work.
19.I.02 Pleasure and commercial recreational craft must not be locked through a lock chamber with Red Flag vessels.
19.I.03 Lockage Of Red Flag Vessels.
- Simultaneous lockage of two Red Flag Vessels or tows or simultaneous lockage of another vessel or tow carrying non-dangerous cargoes and vessel or tow carrying dangerous cargoes, must not be permitted when river traffic in the approach to a lock is light.
- When the river approach to a lock is congested, simultaneous lockage of the aforementioned vessels or tows, other than pleasure craft, must be permitted provided:
- (1) The first vessel or tow entering and the last vessel or tow exiting are secured before the other enters or leaves;
- (2) Any vessel or tow carrying dangerous cargoes is not leaking; and
- (3) All masters involved have agreed to the joint use of the lock chamber.
19.I.04 Vessels with flammable or highly hazardous cargo will be passed separately from all other vessels. Hazardous materials are described in 49 CFR 171; flammable materials are defined in the National Fire Code of the NFPA.
Knowledge Check Choose the best answer for the question.
19-13. Where must safe zones be located prior to the start of work between Red Flag vessels, smoking areas, and hot work areas?
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