Safety technical regulations for oil tank cleaning

　　The tank cleaning operation department should formulate specific practical tank cleaning programs and safety measures according to different conditions of job site.

　　Tank clearing command personnel must visit the site in person during tank clearing operation to solve and deal with the problems found in time.

　　The tank cleaning plan and safety measures shall be implemented after being approved by the supervisor in charge after discussion.

　　Before cleaning tanks, relevant personnel should be given pre-job education on safety and related operating techniques according to division of labor, and they will not be allowed to work until they pass the examination.

　　Whenever there are operators entering tank for inspection or operation, full-time guardians must be set up outside the manhole of oil tank, and one guardian shall not monitor two operating points at the same time.

　　Security (guardian) personnel should strengthen on-site security patrol inspections, and have the right to stop illegal command and operation and report to relevant leaders in a timely manner.

　　The person in charge of shift (group) and safety (guardian) personnel should do a good job in on-site safety inspection, counting of personnel and their tools and equipment during shift handover.

　　The workplace should determine the safe distance, set up safety landmarks or fences, and have special personnel responsible for monitoring the set safety landmarks or fences.

　　In order to ensure safety, canning operation must implement the canning operation ticket system.

　　In order to prevent tank cleaning workers from being poisoned, it is necessary to:

　　1. When the concentration of oil and gas is 4-40% of lower explosion limit of oil, the operators entering the oil tank must wear isolated gas masks.

　　2. When oil gas concentration exceeds 1% of lower explosion limit of oil product and is lower than 4%, operator is allowed to enter the tank for a short time without wearing breathing apparatus, but should wear a gas mask and each operation should not exceed 15 Minutes; at the same time, the work can be repeated up to four times per working day, with an interval of not less than one hour. At this concentration, similar filtering respirators (such as filter gas masks) can also be used, but oxygen content in the gas space should not be lower than 18%.

　　3. When concentration of oil and gas is lower than 1% of lower explosion limit of oil, it is allowed to work for eight hours without protective measures.

　　The air supply of isolated breathing apparatus can be self-priming air, manual air supply, electric fan air supply, compressor air supply, self-contained compressed air type and other methods according to different conditions.

　　According to different places, specifications and sizes of anti-virus equipment and protective equipment selected should ensure that they are suitable for wearing and have good performance. During use, the items in the "Product Manual" must be strictly followed. The inner and outer surfaces of breathing hose should not be polluted by oil, etc.

　　Antivirus equipment, protective equipment, and can cleaning tools must be cleaned after each use. Anti-virus appliances and protective equipment should be carefully tested and inspected before use to ensure they are in good condition and effective.

　　It is strictly forbidden to eat or drink in the workplace. Operators should change clothes and take a shower at designated places before meals and after get off work every day, change their work clothes, wash their faces and hands with soap, and brush their teeth and mouth.

　　The workplace should be equipped with a first-aid kit for personnel rescue, and there should be a special person on duty.

　　When concentration of oil and gas in the tank exceeds the allowable value due to the impact of the operation, the operators should evacuate the site quickly. Re-ventilate until the concentration of oil and gas drops to the specified value before continuing to work.

　　When concentration of oil and gas in the oil tank and its working place exceeds 20% of lower explosion limit of oil product, area within 35 meters (horizontal oil tank can be reduced by 50%) is a fire and explosion hazard place. When entering the site for tank cleaning operations, electrical equipment introduced into the site and its installation must comply with the relevant national regulations on safe use of electricity. In this place, it is necessary to strictly prevent iron objects from colliding with each other.

　　When concentration of oil and gas in the workplace exceeds 40% of the lower explosion limit of the oil, it is forbidden to enter the tank for cleaning.

　　It is forbidden to ventilate or clean oil tanks in thunderstorm days (or low air pressure) or windy days with wind force above level five.

　　The inspection and test of electrical equipment must be carried out in a safe area outside the range of 35 meters from the working oil tank (horizontal oil tank can be reduced by 50%).

　　The water inlet pipeline used for padding or water filling should not use oil pipelines to prevent oil from entering the tank.

　　Before cleaning the oil tank, a proper amount of fire-fighting equipment should be arranged upwind of workplace, and on-site fire-fighting personnel on duty should be fully prepared for fire-fighting.

　　Tank cleaning workers are strictly prohibited from wearing chemical fiber clothing. Chemical fiber ropes and chemical fiber rags are not allowed. Gas detection personnel must wear anti-static clothing and shoes.

　　When the concentration of oil and gas exceeds 20% of lower explosion limit of the oil, it is strictly forbidden to use compressed air, jet steam and high-pressure water gun to flush the tank wall or spray water from top of tank when cleaning the tank.

　　The metal parts such as nozzles of air, water and steam pipelines leading into the oil tank and rubber hose used to discharge oil should be electrically connected to oil tank and should be reliably grounded. For metal pipelines introduced into tank, when resistance value between the flanges is greater than 0.03 ohms, a metal jumper should be used.

　　The mechanical ventilator should be electrically connected to the oil tank and grounded.

　　Air ducts should be made of materials that do not generate static electricity, and plastic pipes are prohibited; and should be in contact with the bottom of tank or ground so that static electricity can dissipate quickly.

　　Tank cleaning workers must wear protective equipment such as work shoes and safety helmets.

　　Oil tank cleaning operations should be avoided in severe winter or midsummer.