Safety measures for closed cabin operations on ships (Gas detection)

The personnel working on site must strictly implement the company's rules and regulations, and need to implement the  closed space entry permit and operation risk control measures inspection system. Without permission,  no one is allowed to open or enter the closed space. Before being allowed to enter,  adequate and effective ventilation is required, through instrument testing, and only after confirming that the conditions for entering a closed cabin  can be entered.

1. Confirmation of sealed cabin conditions 

(1) Effective ventilation 

Effective ventilation of the cabin is an important measure to provide a safe environment for the operators in the cabin  , so it needs to be effective and sufficient. For ships with multi-layer cargo holds  , effective ventilation . Especially for deep cargo tanks, adequate and effective ventilation is required. Uninterrupted mechanical forced ventilation measures should be maintained during the entire  operation to prevent the second hypoxia in the cabin. If the operation is suspended for some reason or the closed cabin is reopened Before operation 

Mechanical ventilation is required when entering a closed compartment with a long cavity or poor natural ventilation effect (such as  double bottom, side tank, fresh Water Tank, anchor chain tank, oil tank and empty tank, etc.)  . When mechanical ventilation , explosion-proof ventilation mechanical measures are to be adopted. It is necessary to control the ventilation time and ventilation  volume, check the inlet and outlet of the ventilator and ensure it is unblocked to prevent false ventilation. At the same time, it is strictly forbidden  to use pure oxygen for ventilation.

(2) Detection of air concentration 

After the cabin has been effectively ventilated, the operators of the ship  also need to detect the concentration of oxygen, carbon dioxide and toxic gases in the air in the cabin before entering the cabin . It is stipulated that the oxygen concentration before entering the cabin shall not be lower than 18%, and the carbon dioxide concentration shall not be higher than 1%. The test for harmful gases should be 0. The method of air detection  can be carried out according to the actual situation at that time. Portable oxygen Detectors, carbon dioxide Detectors and poison Detectors are usually used for detection on ships  . When testing, special attention should be paid to the corners and bottom of the cabin. If the test results fail to meet the relevant requirements, effective ventilation should be continued until the standard test results are met. It is strictly forbidden for personnel to enter the cabin without confirming whether the air quality in the cabin meets the specified requirements  . In addition, when entering manholes and closed cabins to detect or  sample air, the inspectors need to wear self-contained air respirators and are not allowed  to wear filter gas masks, because filter gas masks do not produce oxygen  and can only filter air. Some toxic gases have certain restrictions on the environment in which they are used. At the same time  , relevant test records should be made.

2. Operation of closed delivery room

When entering the cabin for inspection and operation, it is necessary to arrange guardians. Personnel entering the operation  should wear protective equipment such as seat belts and lights, and should communicate with the guardians  outside according to the prescribed contact signals. The guardians must never leave the work site without authorization, and be highly vigilant. staff  to get in touch. During the guardianship, it is not allowed to leave the post for any reason, flee from the post, or enter  the depths of the cargo hold without authorization. Warning signs should be placed on the job site.

For the cabins where oxygen and carbon dioxide concentrations are prone to change during operation,  and when the operation time is long, the concentration changes of oxygen and carbon dioxide , and effective measures should be taken according to the detection results. Self-contained air respirators, safety belts, cables and other safety protection equipment should be carefully and strictly checked before entering the cabin  every time  , and should be replaced immediately if any abnormality is found, and must not be used.

3. Emergency measures for accidents 

When the operator in the cabin finds that there are abnormalities  , he must immediately realize that there may be hypoxia or poisoning in the cabin, stop the operation immediately and evacuate, and report to the guardian; if the operator suddenly faints, In the event of a fall  or unconsciousness with unknown reasons, the guardians also need to first think that it is  caused by hypoxia or poisoning. They should keep calm and report quickly  . Accidents occurred due to operational errors . Rescuers need to wear self-contained air  , and it is forbidden to wear a filter-type gas mask to rescue people in the cabin. Rescued persons who have suffered from hypoxia should be quickly carried to a place with fresh air for  on-site rescue such as artificial cardiopulmonary resuscitation, and at the same time , contact the medical unit as soon as possible for further rescue and treatment.