Internal floating roof inspection and maintenance

Five potential safety hazards in the construction of the floating disk.
During the inspection of the oil tank operations, a simple cleaning and ventilation were performed. However, staff should not enter for inspection as the oil and gas have not been completely dispersed. Additionally, during the inspection of the floating deck, oil continues to be released from within the deck and the buoyancy筒, resulting in a dense concentration of oil and gas, which poses a risk of asphyxiation for those conducting tank entry operations.
2. The maintenance operation involved the injection and inspection process. It was confirmed that the use of electric drills for construction should not be blind under the safety limit range, and the use of a 1000W tungsten lamp without any explosion-proof features for illumination inside the tank is a serious violation of safety regulations, and it poses a high risk of major fire and explosion accidents.
On the construction site, electricians and welders must be certified to work, ensuring construction safety. Maintenance personnel improperly connected electrical wires in the storage area, nearly causing a serious electric shock incident.
4. The maintenance party, having only completed the inventory procedure but not obtained the restricted space work permit or the temporary electrical power permit,擅自 entered the tank for construction, severely violating the oil storage HSE management regulations.
5. During the filling operation, there was no one on-site to supervise the tank externally, and there was no safety personnel overseeing the scene. Rectification measures:
Immediate shutdown.复工 approval will be reissued upon completion of safety hazard rectification.
2. Conducted safety education for new personnel and successfully administered exams.
3. Re-examine each personnel entering for repair and keep copies of their ID cards for record-keeping.
4. Verify the relevant technical qualifications of maintenance personnel; those who do not meet the requirements are prohibited from participating in maintenance work.
5. Signed a "Safety Commitment Agreement" with the maintenance personnel.
6. The manufacturer must provide a mature "Floating Deck Maintenance Construction Technical Plan for Oil Tanks" along with detailed safety measures, and submit it for approval to the company's Safety and Environmental Protection Department.
7. Tank entry maintenance work and temporary electrical power usage require the prior submission of the "Confined Space Work Permit" and the "Temporary Electrical Power Usage Permit." After approval and the implementation of specific safety precautions, the work may proceed.
8. Prior to entry, the maintenance party must use an explosion-proof gas detector to test the gas concentration inside the tank, focusing on the following two main aspects:
Flammable Gas Concentration: Entry into the tank for electrical operations is permitted only when the concentration meets the specified limit (2% lower limit for alkanes).
② Oxygen Concentration: Only when the concentration is above 18%, can individuals enter the tank for work. It is required to: check the concentration every half hour, rotate personnel entering the tank every half hour, have a dedicated supervisor outside the tank, and immediately report and handle any abnormal situations. Additionally, a safety supervisor from the warehouse must be present at each construction site; entry into the tank is prohibited without the supervisor's presence.
9. Kufang and the factory have signed the "Internal Floating Roof Tank Maintenance Construction Safety Agreement," specifically defining the safety responsibilities and obligations of both parties.