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Checklist for Preparing Confined Space Work Before Water Tank Cleaning | Excel for Equipment Allocation and Gas Measurement Records
2026.10.13 15:26
Serious Accidents ยท Occupational Safety and Health Act ยท Data
Checklist for Preparing Confined Space Work Before Water Tank Cleaning | Excel for Equipment Allocation and Gas Measurement Records
When entrusting water tank cleaning to a company Contract โ 1 week before work โ Day of work โ Before work โ During work โ After work This is an Excel checklist that records items to be verified in order, along with measurements for equipment preparation, oxygen, and hazardous gases, in a single file. When measurements are entered, it automatically compares them with the appropriate air standards, and if a required item is empty, it displays 'Work Start Pending'.
๐ Attachments to this post
Attachment ยท Water Tank Cleaning Confined Space Work Preparation Checklist.xlsx
Writing down work information Work Overview , verifying the preparation entity and calibration/inspection for each piece of equipment Equipment Allocation Table , showing step-by-step verification items and whether the task can be started Step-by-step checklist , comparing the measured value with the appropriate air standard Gas measurement records , summarizing the reference values โโand formula basis Standards and Basis , containing the order of use Writing Guide It consists of sheets.
Writing down work information Work Overview , verifying the preparation entity and calibration/inspection for each piece of equipment Equipment Allocation Table , showing step-by-step verification items and whether the task can be started Step-by-step checklist , comparing the measured value with the appropriate air standard Gas measurement records , summarizing the reference values โโand formula basis Standards and Basis , containing the order of use Writing Guide It consists of sheets.
๐ When is the best time to use this?
- When the semi-annual water tank cleaning schedule has been set, but you haven't organized what to request from the company and what to keep on hand
- When we were verbally confirming every time whoโthe company or the vendorโwas preparing the measuring instruments, ventilation fans, and breathing apparatus.
- When receiving measurement results from the company but not separately verifying whether they meet appropriate air standards
- When you want to gather cleaning records under the Waterworks Act and measurement records under the Occupational Safety and Health Act in one place
The criteria for dividing the roles of the client and the subcontractor is Confined space water tank work pillar text I have organized this in detail. This article focuses on how to use a checklist file.
๐๏ธ Material Composition
| sheet | use | Input / Automatic |
|---|---|---|
| Writing Guide | Usage order, input rules, distinction between statutory obligations and recommended practices, precautions | For reading |
| Work Overview | Work date, water tank location/capacity, company information (reported status of water tank cleaning business, cleaning supervisor), personnel assigned, supervisor, emergency contact | input |
| Equipment Allocation Table | Necessity for each of the 10 types of equipment, responsible party for preparation (contractor, subcontractor, rental by the Corporation, etc.), and calibration/inspection verification date | Input + 'Verification Required' Auto Display |
| Step-by-step checklist | Level 5, 26 items, Statutory/Recommended Classification, Responsible Person, Result (SuitableยทInadequateยทNot Applicable) | Result Selection + Automatic Step-by-Step Aggregation and Task Start Determination |
| Gas measurement records | Measurement time, location, and measurer, oxygen, carbon dioxide, carbon monoxide, and hydrogen sulfide measurement values | Input measurement value + Automatic judgment of appropriate/inappropriate |
| Standards and Basis | Adequate Air Standard Values, Water Supply Act Water Quality Verification Standards, Link to Official Basis | For reading |
โ๏ธ Order of Use
- Fill in the work outline โ Once the work date is set, record the location of the water tank, the size and depth of the manhole, the company name and whether the water tank cleaning business is registered, and the names of the cleaning supervisor, measurer, and monitor.
- Determining Equipment Allocation โ Select the requirement and the preparation entity for each piece of equipment. If the equipment is required but the preparation entity is empty, or if the instrument calibration/inspection verification date is empty, 'Verification Required' will be displayed.
- Step-by-step check โ Select a result for each item from the contract stage to after the work. If there is a 'Deficient' or blank space among the statutory items, the top judgment is displayed as 'Work Start Pending'.
- Input measurement value โ If you input the measurement results received from the company (before work, before re-entry) by location, 'Appropriate' or 'Inappropriate' is displayed compared to the appropriate air quality standards.
- custody โ Once the work is finished, save the file as a PDF to keep the waterworks cleaning records (2 years) and measurement records (3 years) together.
๐งฎ Automatic Judgment Method
| sheet | verdict | standard |
|---|---|---|
| Gas measurement records | Suitable / Inappropriate | Oxygen 18% or more and less than 23.5%, carbon dioxide less than 1.5%, carbon monoxide less than 30 ppm, hydrogen sulfide less than 10 ppm (Article 618 of the Occupational Safety and Health Regulations) |
| Step-by-step checklist | Job available to start / Job start pending | It is possible if all statutory items in stages 1โ3 are 'suitable' or 'not applicable', and all pre-work measurements are 'adequate'. |
| Equipment Allocation Table | Needs verification | If the necessity is 'necessary' but the preparation entity is blank, or the inspection confirmation date for measuring instruments or air breathing apparatus is blank |
โ Things to check before applying the checklist
Please decide on the following items first before writing the file. Especially Designation of measurer, method of sharing measurement records, 119 reporting person If these are not determined, confusion will arise on the day even if you fill out the checklist. If three or more items are undecided, it is recommended to schedule a work planning meeting with the vendor first.
| Inspection items | Confirmation details | check |
|---|---|---|
| manager | We appointed the company's work manager (facilities and safety) and the contractor's work supervisor. | โก |
| rater | We determined the measurement personnel designated by the company and the method of sharing measurement results (copies/photos). | โก |
| equipment | The entity responsible for preparing the equipment allocation table was finalized together with the company. | โก |
| 119 call | The supervisor, the company's reporting officer, and the ambulance entry point were determined. | โก |
| Post | We decided on a location to post the pre-work checklist at the entrance. | โก |
| custody | I designated a folder to store the Waterworks Act records and the Occupational Safety and Health Act records together. | โก |
๐ Precautions when using
- The 'Work Ready' designation is merely the result of an internal company inspection and is not a legal ruling. If measurements or conditions change on-site, stop work immediately and re-check.
- Measurements are performed directly by a measurer designated by the vendor, and this file is intended for receiving and verifying the results. If a company employee enters directly, the company must fulfill all requirements regarding measurer designation, equipment provision, and special training.
- The checklist items are distinguished between statutory obligations and practical recommendations. Recommended items may be adjusted to suit the specific situation of the workplace.
- Since worker names and contact information are included, please restrict file sharing to relevant personnel.
โ FAQ
Q1. The company uses its own form; do we need to use this file again?
If you have performed measurements and verification using the vendor's form, you may obtain and keep a copy. Since this file is used by the company to check whether information provision, equipment allocation, and implementation verification have been completed without omission, it is recommended to use it in conjunction with the vendor's form.
Q2. How many measurement locations should I list?
The number of measurement points is not specified in the regulations. Since KOSHA GUIDE H-80-2021 recommends measuring at least three points each in the vertical and horizontal directions, I organized the rows so that heights could be recorded separately, such as at the entrance, middle, and bottom of the manhole.
Q3. How do I record equipment rental from the Corporation on the equipment allocation table?
Select 'Rent from Corporation' under Preparedness, and enter the rental and return dates in the Remarks section. You must also verify that the rented equipment has been calibrated and inspected prior to measurement, and please keep in mind that the measurement conducted by the Corporation's implementing agency does not substitute for the assessment of the appropriate construction period for the workplace.
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Confined Space Water Tank Work | Sharing In-house Equipment and Supplier Verification Points โ Confirmation Checklist for Provision and Receipt of Safety and Health Information Before Contract Work โ Record standards for reporting and approving the resumption of work suspension requests at contract and service sites โ
๐ Next step
Some employees experience lingering tension and anxiety after completing dangerous tasks. Along with on-site safety management, try establishing a counseling channel that employees can comfortably use.
Inquire about EAP Implementation โ๐ Source and Verification Criteria
- National Law Information Center ยท Rule 618 (Definitions) ยท Appendix 18 (Confined Spaces)
- National Law Information Center ยท Rules on Occupational Safety and Health Standards Articles 619, 619-2, 620โ625, 640, and 641
- National Law Information Center ยท Articles 63, 64, and 65 of the Occupational Safety and Health Act (Provision of Information on Safety and Health by the Contractor, etc.)
- National Law Information Center ยท Article 54 of the Enforcement Decree of the Occupational Safety and Health Act (Work with risk of suffocation or collapse)
- National Law Information Center ยท Articles 83 and 85 of the Enforcement Rules of the Occupational Safety and Health Act, Annex 4 and Annex 5 (Special Education)
- National Law Information Center ยท Articles 33 and 34 of the Water Supply Act, Articles 22-4 to 22-6 of the Enforcement Rules of the Water Supply Act (Cleaning, Inspection, and Recording of Water Reservoirs)
- Ministry of Employment and Labor ยท Amendment and Promulgation of the Rules on Industrial Safety and Health Standards to Strengthen Prevention of Asphyxiation Accidents in Confined Spaces (December 1, 2025)
- Korea Occupational Safety and Health Agency ยท On-site Asphyxiation Accident Prevention One-Call Service (Equipment Rental)
- Korea Occupational Safety and Health Agency ยท KOSHA GUIDE H-80-2021 Technical Guidelines on the Establishment and Implementation of Confined Space Work Programs
This document is a practical reference checklist for inspecting the readiness for confined space work when subcontracting water tank cleaning. Automatic judgments are merely the result of comparing input values โโwith standard values โโand do not substitute for legal judgments; on-site measurements and decisions to halt work must be made by the business owner and the person performing the measurements. For matters requiring site-specific judgment, please verify with the competent regional employment and labor office or the Korea Occupational Safety and Health Agency. Date of verification of laws and official data: October 13, 2026.
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