Permit to enter confined space

Before entering a confined space for work, it is necessary to clean and purge the space, meeting the following requirements: 1 Before cleaning, one must first be familiar with the physical and chemical properties of the substances present in the confined space as well as the MSDS of related materials. If necessary, relevant technical personnel will be involved to analyze and identify possible substances, as well as to conduct a risk assessment. Assess the types and approximate quantities of toxic substances and flammable and explosive materials. 2 Steam or hot water should be used as the cleaning medium; no dead ends should remain during cleaning, and the cleaning sequence should proceed from top to bottom. If there are materials that are difficult to clean with steam or hot water, appropriate solvents should be used for cleaning, and non-toxic substances should be chosen ； After cleaning, wash again with steam or hot water ； 3 After cleaning, the space should be purged with nitrogen, and the nitrogen level should be monitored continuously; the nitrogen concentration in the confined space after purification should be above 95%. 4 After nitrogen displacement, factory compressed air is introduced for further displacement; the compressed air should be introduced from the bottom while nitrogen is exhausted from the top, with the flow rate kept below 2 cubic meters per minute. 5 The oxygen content after permutation should be 18–21%. During the displacement process, the oxygen level should be monitored continuously until it stabilizes. Appendix 1: License Format – Permit for Entering Confined Spaces. Date and time of issuance: ___________________ Valid date and time: ____________________ Workplace/space number: ____________________ Supervisor: _______________________ Work equipment: ______________________________ Task to be carried out: ______________________ Names of workers: 1. _____________ 2. ___________________ 3. ____________________ 1. Air quality inspection: Time: _____________________ Oxygen level: _____________________ % Explosive potential: _____________________ % L.F.L. Name and concentration of toxins: ___________________ mg/m3 2. Inspector’s signature: _____________________ 3. Hazard isolation (not entered): N/A Yes No Pipes or lines sealed at one end: ( ) ( ) ( ) Isolated or sealed: ( ) ( ) ( ) 4. Ventilation facilities: N/A Yes No Mechanical ventilation: ( ) ( ) ( ) Only natural ventilation: ( ) ( ) ( ) 5. Air quality inspection after isolation and ventilation: Oxygen level: ____________ % > 19.5 % Explosive potential: ____________ % L.F.L. < 10 % Name and concentration of toxins: ___________ mg/m3 < Exposure limit Time: ____________ Inspector’s signature: _________________________ 6. Communication procedures: ____________________________________________________________ _____________________________________________________________________ 7. Rescue procedures: ____________________________________________________________ _____________________________________________________________________ 8. Workers, supervisors, or backup personnel: Yes No Have they received the necessary training? ( ) ( ) are they needed currently? ( ) ( ) 9. Equipment: N/A Yes No Direct-reading gas monitor ( ) ( ) ( ) Lifeline ropes and slings for workers and supervisors ( ) ( ) ( ) Lifting equipment ( ) ( ) ( ) Power communication systems ( ) ( ) ( ) SCBA for workers and supervisors ( ) ( ) ( ) Protective clothing ( ) ( ) ( ) Flame-retardant and explosion-proof electronic equipment as well as tools that do not generate sparks ( ) ( ) ( ) 10. Results of regular air quality tests: Oxygen level ______% Time ______ Oxygen level ______% Time ______ Oxygen level ______% Time ______ Oxygen level ______% Time ______ **Concentration ______% Time ______** Concentration ______% Time ______ **Concentration ______% Time ______** Concentration ______% Time ______ Name of toxin, concentration ____% Time ______ Name of toxin, concentration ____% Time ______ We have evaluated the work authorization and related information. The instructions and safety measures that can be obtained and understood are recorded. If any field is filled in with “No” or “None”, the applicant cannot be approved for entry. A license can only be issued after all projects have been completed. Person responsible for preparing the permit: (Supervisor) _____________________________________ Person who approves it: (Unit Supervisor) ___________________________________________ Person who conducts the assessment: (Confined space operator): _____________________________ _____________________________ (Printed name) (Signature) The permit is to be kept at the workplace. A copy of the permit for that workplace is kept in the respective safety office. Copies: White original (Security Office), Yellow original (Unit Supervisor), Hardcover original (Worksite)

However, this isn’t the type of form used by our company. I’ll go to the office this afternoon and copy one for you, or if there’s no text file, I can take a photo of it for you.

When working in a confined space, it is important to note that after 2 hours of continuous work followed by a 30-minute break, another inspection must be conducted; however, there is no need to issue a new permit. To prevent poisoning and asphyxiation caused by insufficient nitrogen or oxygen, a long-tube respirator can be worn; note that forced ventilation systems must be installed when the distance exceeds 10 meters