Circular No. 204/2017/TT-BQP promulgates the Technical Safety Inspection Procedure for Nitrogen Storage Tank Systems, Networks, and Pipelines (for Campaign Cannon Body Pressing Machines) used in the Ministry of National Defense (Technical Safety Inspection Procedure 07:2017/MND).

(Issued together with Circular No. 204/2017/TT-BQP dated August 22, 2017)

1.1. Scope of Regulation

4.1. Nitrogen storage systems, networks, and pipelines
9.2. Internal technical inspection

9.3. Technical inspection and testing
of the Minister of National Defense)

HANOI - 2017

 

Table of Contents

1. Scope and Objectives 

9.4. Operational inspection           

1.2. Applicability  

2. Forms of Inspection 

3. Referenced Documents  

4. Terms and Definitions 

The Technical Safety Inspection Procedure for Nitrogen Storage Systems, Networks, and Pipelines used in the Ministry of National Defense (Technical Safety Inspection Procedure 07:2017/BQP), compiled by the Technical Department and submitted for issuance by the Minister of National Defense through Circular No. 204/2017/TT-BQP dated August 22, 2017.

4.2. Initial Technical Safety Inspection   

4.3. Periodic Technical Safety Inspection   

4.4. Unusual Technical Safety Inspection

5. Inspection Steps 

6. Inspection Tools   

7. Inspection Conditions

8. Preparation for Inspection 

8.1. Unifying the Inspection Plan

8.2. Checking Documentation and History 

8.3. Preparing Inspection Tools  

8.4. Preparing Safety Measures During Inspection     

9. Conducting the Inspection

9.1. External Technical Inspection  

Nitrogen storage systems, networks, and pipelines.  

1. SCOPE AND APPLICABLE OBJECTS

This Technical Safety Inspection Procedure applies to initial, periodic, and extraordinary technical safety inspections of nitrogen storage systems, networks, and pipelines used for campaign bullet body pressing machines (hereinafter referred to as systems) listed in the Catalogue of Machinery, Equipment, and Materials with Strict Requirements for Military Occupational Safety issued by the Ministry of National Defense.       

10. Handling Inspection Results 

11. Inspection Period 

12. Appendix I

13. Appendix II         

Foreword

Based on this procedure, technical safety inspection organizations and inspectors within the Ministry of National Defense shall directly apply it or develop detailed procedures for each type of system without contravening this procedure. Management units, enterprises, organizations, and individuals using the systems must cooperate with inspection units and inspectors in accordance with the law.

9.2. Internal technical inspection                                                                                             1.1. Scope of Regulation

- Management units, enterprises, organizations, and individuals managing and using nitrogen storage systems, networks, and pipelines in the Ministry of National Defense (collectively referred to as entities);

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2. FORMS OF INSPECTION

1.1. Scope of Application

The Technical Safety Inspection Procedure for systems must be fully implemented in the following cases:

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1.2. Applicability

- QCVN 01:2008/BLĐTBXH - National Technical Regulations on Boiler and Pressure Vessel Safety;

- Relevant state management agencies.

+ TCVN 6174: 1997: Industrial explosives - Safety requirements for production, blasting tests, and acceptance;

- TCVN 8366:2010 - Pressure Vessels - Technical Safety Requirements for Design and Construction;

- TCVN 6155:1996 - Pressure Vessels - Technical Safety Requirements for Installation, Use, and Repair;

+ TCVN 4756 - 1989: Grounding and ungrounding regulations for electrical equipment;

+ TCVN 6734:2000: Electrical equipment used in mines and tunnels - Safety requirements for structure and use;

+ Electrical Equipment Regulations Part I. General Provisions - 11TCN-18-2006;

Including national technical standards and regulations on safety as follows:- TCVN 6156:1966 - Pressure Vessels - Technical Safety Requirements for Installation, Use, Repair, and Testing Methods;

- QCVN 01:2011/BCT. National Standard on Safety in Underground Mining Operations;

- TCVN 2622:1995 - Fire Prevention and Control for Buildings and Structures - Design Requirements;

- TCVN 6290:1997 - Gas Cylinders - Permanent Gas Cylinders - Pre-fill Inspection;

- TCVN 6713:2000 - Gas Cylinders - Safe Handling;

- TCVN 6008:2010 - Pressure Equipment - Welding Requirements and Testing Methods;

- TCVN 9385:2012 - Lightning Protection for Building Structures - Design, Inspection, and Maintenance Guidelines;

- TCVN 9358:2012 - Installation of Grounding Equipment for Industrial Structures - General Requirements.

In case the national technical regulations and national technical standards cited in this inspection procedure are amended, supplemented, or replaced, they shall be applied according to the provisions of the amended, supplemented, or replaced documents.

The technical safety inspection of system components may be conducted according to other standards when requested by the user entity or manufacturer, provided that such standards have equivalent or higher technical safety requirements than those specified in the national standards cited in this procedure.

4. TERMINOLOGY AND DEFINITIONS

This procedure uses the terminology and definitions in the referenced documents and some terms and definitions in this procedure are understood as follows:

4.1. A nitrogen storage system, network, and pipeline is a set of equipment used to store high-pressure gas to be charged into the pressure generator of a campaign bullet body pressing machine, increasing the pressing pressure for the campaign bullet body pressing process.

4.2. Initial technical safety inspection is the activity of evaluating the technical safety condition of the system according to technical safety standards and regulations during installation, before its first use.

4.3. Periodic technical safety inspection is the activity of evaluating the technical safety condition of the system according to technical safety standards and regulations at the end of the previous inspection period.

4.4. Extraordinary technical safety inspection is the activity of evaluating the technical safety condition of the system according to technical safety standards and regulations when:

- After repair, upgrade, or improvement affecting the technical safety condition of the system;

- When required by the entity or competent authority.

5. INSPECTION STEPS

When conducting a technical safety inspection of the system, the technical safety inspection organization must sequentially implement the following steps:

Step 1. Preparation for inspection

Step 2. Review of technical documentation

Step 3. External and internal inspection

Step 4. Technical testing

Step 5. Operational inspection

Step 6. Processing of inspection results.

All inspection results from each step must be fully recorded in the field record sheet according to the model prescribed in Appendix I and kept complete at the inspection organization.

6. INSPECTION EQUIPMENT

Step 5. Operational testing

Step 6. Processing the inspection results.

Note:

The subsequent inspection steps can only be conducted if the results of the previous step meet the requirements. All inspection results from each step must be fully recorded in the on-site record book according to the model specified in Appendix I and kept complete at the inspection organization. If it meets the requirements. All inspection results at each step must be fully recorded in the on-site logbook according to the form specified in Appendix I and kept complete by the inspection organization.

6. INSPECTION EQUIPMENT

The equipment and tools for inspection must be suitable for the object being inspected, must be calibrated and verified according to regulations, and must still be within their verification period, including:

6.1. Equipment and tools for inspection

- Lighting equipment with a power supply voltage not exceeding 12 V;

- A magnifying glass with appropriate magnification;

- Magnifying glasses with appropriate magnification;

- Measuring and mechanical tools: Micrometer, caliper, tape measure, and other related tools;

- Internal inspection equipment: Endoscopes.

6.2. Equipment and tools for durability and tightness testing

- Pressure generation equipment with technical characteristics (flow rate, pressure) suitable for the test object;

- Means and equipment for checking tightness.

- Cable and steel quality testing equipment;

Pressure gauges with accuracy class and scale suitable for the test pressure;

- Ultrasonic thickness testing equipment;

- Weld quality testing equipment;

- Metal surface quality testing equipment.

- Other specialized measuring and testing equipment (if necessary).

7. CONDITIONS FOR INSPECTION

When conducting inspections, the following conditions must be ensured:

7.1. The system must be in a state ready for inspection.

7.2. The system's documentation must be complete.

7.3. Environmental and weather factors must not affect the inspection results.

7.5. Safety and labor hygiene conditions must be met to operate cables and cranes.

7.5. Safety and labor hygiene conditions must meet the requirements for inspecting the system.

8. PREPARATION FOR INSPECTION

Prior to conducting the inspection, the following preparatory work must be carried out:

8.1. Unify the inspection plan, preparatory work, and coordination between the inspection organization and the facility, including the following contents:

8.1.1. Prepare the system's documentation fully in accordance with regulations;

8.1.2. Remove media, clean inside and outside the system;

8.1.3. Prepare facilities to ensure that all parts of the system can be examined;

8.1.4. Prepare human resources and materials for inspection; assign personnel to participate and witness the inspection.

8.2. Checking Documentation and History

Based on the type of inspection, check and review the technical documents of the system.

8.2.1. When conducting initial safety technical inspection:

- Check the history of the system and cylinders in the system: In accordance with QCVN 01:2008/BLĐTBXH, pay attention to reviewing the following documents:

+ Specifications regarding the manufacturing metal and welding metal;

+ Calculations of the strength of pressure-bearing parts;

+ Drawings showing all key dimensions;

+ Operation, maintenance, and repair instructions;

+ Certificates of conformity issued by authorized organizations in cases where national technical standards have been issued for the inspected objects (if applicable).

- Check the factory release documents of the cylinders in the system:

+ Certificates regarding the manufacturing metal and welding metal;

+ Results of weld quality checks;

+ Factory acceptance test reports;

+ Documents of other components in the system.

- Check calibration reports of measurement devices; grounding, lightning protection, and protective device inspection records (if applicable).

- Check installation documents:

+ Name of the installation and using facility;

+ System operation principle diagram;

+ Installation design;

+ Characteristics of additional materials during installation;

+ Welding data such as welding technology, electrode code, welder name, and welding test results;

+ Inspection reports of individual system parts (if applicable);

+ Overall system acceptance report.

- Check procedures:

+ Pre-charging cylinder inspection procedure;

+ Charging procedure;

+ Fire prevention and control documents.

8.2.2. When conducting periodic safety technical inspection:

- Check the system history, previous inspection reports, and results;

- Usage, operation, and maintenance management documents of the system; inspection and supervision reports (if applicable).

8.2.3. When conducting abnormal safety technical inspection:

- In case of system repair, modification, or upgrade: Design documents for repair, modification, or upgrade, post-repair, modification, or upgrade acceptance reports;

- In case the system has not operated for more than 12 months, consider the documents as in periodic safety technical inspection.

Evaluation:

The inspection of system documents and history meets the requirements when:

- The system and cylinder history is complete and meets the requirements specified in Article 2.4 QCVN 01:2008/BLĐTBXH;

- If not met, the facility must take supplementary measures as stipulated in Article 3.2.2 QCVN 01:2008/BLĐTBXH.

8.3. Prepare sufficient inspection means suitable for the inspection process.

9. CONDUCTING INSPECTION

9. CONDUCTING INSPECTION

When conducting system inspection, it must be carried out in the following sequence:

9.1. External Technical Inspection

9.1.1. Ground layout and installation position;

9.1.2. Operational lighting system;

9.1.3. Work platforms, hanging racks, walking paths, and related contents;

9.1.4. Electrical grounding and lightning protection system;

9.1.5. Check technical parameters on the labels of the system and cylinders against design and historical records;

9.1.6. Check the status of safety, measurement, and auxiliary equipment in terms of quantity, type, and technical parameters against design and standard requirements;

9.1.7. Check pipelines, valves, and pipe fittings installed on the system in terms of quantity, type, and technical parameters against design and standard requirements;

9.1.8. Check the status of other auxiliary equipment accompanying the system operation;

9.1.9. Check the condition of welds and metal surfaces of pressure-bearing parts. If there is doubt, require the facility to apply appropriate supplementary inspection methods to assess more accurately;

9.1.10. Technical condition of insulation layers (if applicable);

9.1.11. Check joint details;

9.1.12. Check charging racks and cylinder holding details during charging. System for checking and determining the amount of gas charged.

Evaluation:

External inspection of the system meets the requirements when:

- Meeting the requirements of applicable standards;

- For cylinders in the system: Meeting the provisions of Article 3 TCVN 6155:1996 and Article 8 TCVN 8366:2010;

- No cracks, bulges, dents, excessive corrosion, or signs of medium leakage at pressure-bearing parts and welds, joints.

Nitrogen storage systems, networks, and pipelines.

9.2.1. Check the condition of metal surfaces of pressure-bearing parts;

9.2.2. Check the condition of dirt, rust, and internal metal wall corrosion of pressure-bearing parts;

9.2.3. Inspect the welding conditions and the surface of metal parts under pressure. If there is any doubt, require the facility to apply appropriate additional inspection methods to assess more accurately;

9.2.4. For positions that cannot be inspected internally during testing, technical inspections must be carried out according to the manufacturer's technical documentation. The documentation must clearly specify: items, methods, and sequence of inspection;

9.2.5. In cases where there is suspicion about the technical condition in the heat exchanger area, require the facility to remove individual sections or the entire heat exchanger for inspection;

9.2.6. When internal inspection is not possible due to the structural characteristics of the system, it is permissible to replace internal inspection with a strength test at the specified test pressure and inspect accessible parts;

Evaluation:

The results of the internal system technical inspection meet the requirements when:

- For cylinders in the system: Meeting the provisions of Article 3 TCVN 6155:1996 and Article 8 TCVN 8366:2010;

- There are no cracks, bulges, dents, or corrosion exceeding the specified limits on pressure-bearing parts and at welds and joints;

9.3. Technical inspection and testing

9.3.1. If the system has a multi-part structure operating at different pressures, each part can be separated and tested individually;

9.3.2. During inspection, isolation measures must be taken to ensure that automatic protective devices and measuring instruments are not damaged at the test pressure. If this cannot be guaranteed, these devices must be removed;

9.3.3. Strength testing:

Containers in the system are exempt from initial strength testing if they have been factory-tested within 18 months, well-preserved, and show no signs of impact or deformation during transportation and installation. The inspection report must clearly state the reasons and attach the factory test reports of the manufacturer and the acceptance installation report (if available). The strength test period shall not exceed six years once, and in case of irregular inspection, a strength test must be conducted with the following requirements:

- The test medium is liquid (water) or inert gas (compressed gas), with a test medium temperature below 50°C and not lower than the ambient temperature by more than 5°C;

- The test pressure and holding time are specified in Table 1;

Table 1

1. Test pressure and holding time for strength testing of the system after initial installation

Remarks- Operating pressure._{but not less than 2 bar} 2. Test pressure and holding time for strength testing of the system during regular and irregular inspections.

>= 5 bar

Remarks- Procedure for strength testing:_{but not less than 2 bar} 2. Test pressure and holding time for strength testing of the system during regular and irregular inspections.

+ Loading the test medium: Fill the system with the test medium (note the venting of air when using a liquid);

+ Increase the pressure to the test pressure (note to increase gradually to avoid sudden expansion which may damage equipment and strictly prohibit hammering at test pressure). Monitor and detect any abnormal phenomena during the test;

+ Maintain the test pressure as prescribed;

+ Gradually reduce the pressure back to the operating pressure, maintain this pressure throughout the inspection process. Then reduce the pressure to (0); address any deficiencies (if any) and recheck the corrected results;

- Strength testing is only allowed when satisfactory results are obtained from external and internal technical inspections and durability calculations based on direct measurement data;

- When testing with gas, safety measures must be applied as follows:

+ Valves and pressure gauges on the gas loading pipeline must be moved away from the equipment location or placed outside the equipment room;

+ During gas testing, non-responsible personnel must stay in a safe place;

- Check for leaks using soap solution or other methods. Strictly prohibit hammering on the tank walls during gas pressure testing;

The results of the system strength testing meet the requirements when:

Evaluation:

- There are no cracks;

- No bubbles or water droplets are found at welds and joints;

- No deformation is detected;

- Allowable pressure drop during the holding time: ≤ 0.5% of the test pressure;

9.3.4. Leak testing: Only applicable when required by technology or by the manufacturer's request;

- Test medium: Nitrogen;

- Test pressure and holding time are specified in Table 2;

Pressure, medium, and holding time for leak testing

Table 2

Gas pipeline

Remarks- Operating pressure._{but not less than 2 bar} 2. Test pressure and holding time for strength testing of the system during regular and irregular inspections.

Note:

- Procedure for leak testing:

+ Load the test medium into the system and increase the pressure to the test pressure;

+ Detect leaks using soap solution or other methods;

The results of the system leak testing meet the requirements when:

Evaluation:

- No leaks are detected;

- Allowable pressure drop during the holding time: < 3%;

9.4.1. Verify all conditions necessary for the system to be put into operation;

This Technical Safety Inspection Procedure applies to initial, periodic, and extraordinary technical safety inspections of nitrogen storage systems, networks, and pipelines used for campaign bullet body pressing machines (hereinafter referred to as systems) listed in the Catalogue of Machinery, Equipment, and Materials with Strict Requirements for Military Occupational Safety issued by the Ministry of National Defense.

9.4.2. Inspect the operational status of the system and its accessories; the functioning of measuring and protective devices;

9.4.3. Once the system operates stably, increase the pressure to test and calibrate the operating pressure of the safety valve, seal the safety valve;

9.4.4. Safety valves can be calibrated and sealed during the operation test process;

9.4.5. Safety valves are calibrated and sealed as follows:

- The set pressure of the safety valve does not exceed the value below:

+ 0.5 bar - When

+ P_{but not less than 2 bar} the operating pressure is up to 3 bar; + 15% P

+ P_{but not less than 2 bar} - When_{but not less than 2 bar} the operating pressure is above 3 bar to 60 bar; + 10% P operating pressure above 60 bar;

+ P_{but not less than 2 bar} - For gas charging units, calibration and sealing are performed_{but not less than 2 bar} the operating pressure is above 3 bar to 60 bar; at the set pressure as specified by the manufacturer;

- Safety valves of compression stages on compressors are calibrated and sealed according to the manufacturer's requirements; The results of the system operation inspection meet the requirements when auxiliary devices and measuring and protective devices operate normally, and operating parameters are stable; 10. HANDLING INSPECTION RESULTS

10.1. Prepare an inspection report with complete content according to the model provided in Appendix II issued together with this procedure. The report must clearly record all contents and standards applied during the inspection, including any higher safety criteria requested by the equipment owner compared to the criteria specified in Clause 3 of this procedure (when the equipment is manufactured according to the corresponding standards and safety criteria).

Evaluation:

The operational system inspection results meet the requirements when auxiliary equipment and measurement protection devices operate normally, and working parameters are stable.

10. PROCESSING THE INSPECTION RESULTS

10.1. Prepare the inspection report with all contents according to the form prescribed in Appendix II issued together with this procedure. The report must clearly record all contents and standards applied during the inspection, including safety criteria higher than those specified in the TCVN standards under Article 3 of this Procedure (when the equipment is manufactured in accordance with these standards and corresponding safety criteria).

10.2. Approve the inspection report

The minimum participants required to approve the inspection report must include the following members:

- A representative of the facility or a person authorized by the facility;

- A person assigned to participate and witness the inspection;

- Inspector conducting the inspection.

When the record is approved, the inspector, the witness to the inspection, the representative of the facility, or the person authorized by the facility shall sign and affix their seal (if applicable) on the record. The inspection record shall be made in two (02) copies, each party responsible for keeping one copy.

10.3. Summarize the inspection results in the system's file (clearly stating the inspector's full name, date of inspection, applied standards).

10.4. Affix the inspection label: When the system's inspection results meet the technical safety requirements, the inspector shall affix the inspection label to the system (the inspection label model in accordance with the regulations of the Ministry of National Defense). The inspection label shall be placed in a visible location.

10.5. Issue the Certificate of Inspection Results

10.5.1. When the system's inspection results meet the technical safety requirements, the inspection unit shall issue a certificate of inspection results to the system within five (05) working days from the date of approval of the inspection record at the facility.

10.5.2. When the system's inspection results do not meet the requirements, only steps specified in 10.1 and 10.2 shall be carried out; only provide the facility with the inspection record, clearly stating the reasons why the system does not meet the inspection requirements, recommending the facility to rectify the issues and the deadline for implementing these recommendations; simultaneously send the inspection record and notification to the labor safety management authority of the entity under the Ministry of National Defense that manages the installation and use of equipment.

11. INSPECTION PERIOD

11.1. The periodic technical safety inspection period is three (03) years; for systems that have been in use for more than twelve (12) years, the periodic technical safety inspection period is two (02) years, and for systems that have been in use for more than twenty (20) years, the periodic technical safety inspection period is one (01) year.

11.2. In cases where the manufacturer specifies or the facility requests a shorter inspection period, it shall be implemented according to the manufacturer's regulations and the facility's requirements.

11.3. When shortening the technical safety inspection period, the inspector must clearly state the reasons in the inspection record.

11.4. When the technical safety inspection period is stipulated in national technical standards, it shall be implemented according to the provisions of those standards.

11.5. In cases requiring irregular inspections, follow the provisions in Clause 4.4 of this procedure./.

Appendix I

SAMPLE FIELD RECORD FORM

......,day...month...year 20...

FIELD RECORD

(Record all testing parameters accurately according to the inspection procedure)

I. General Information:

Equipment Name: ..................................................................................................................................... 

Name of Organization or Individual Requesting: ................................................................................................................................

Main Address (Headquarters of the Facility): ................................................................................................................................ 

Installation Address:    ................................................................................................................................ 

Content of Work Session with the Facility:

- Worked with whom (information):

- Witness:

II. Inspection of air compressor documentation

1. Initial inspection

a) Factory documentation:

- System history;

- System operating principle drawings;

- Drawings of pressure vessel components in the system;

- Operation and maintenance instructions;

- Metal quality inspection certificate;

- Welding and joint inspection certificate.

b) Installation documentation:

- Installation design;

- Overall system acceptance record;

- Pre-fill tank inspection procedure;

- Filling procedure;

- Fire protection documentation.

c) Measurement inspection certificates:

- Measuring instrument calibration certificate.

- Grounding and lightning protection inspection record.

- Protective device inspection record.

2. Periodic and extraordinary inspections

a) History, previous inspection records, and inspection result certificates.

b) Operation log.

c) Repair and maintenance log; inspection and testing records (if available).

3. Extraordinary inspections

a) Documentation similar to periodic inspections.

b) Repair documentation; quality inspection and modification records.

III. External technical inspection of air compressors

1. Position (distance from walls, between equipment).

2. Operating lighting.

3. Technical specifications compared to history (model number, serial number, country of manufacture, month and year of manufacture, design pressure, operating pressure, temperature, capacity, medium...).

4. Condition of pressure-bearing parts: Deformation, swelling, corrosion, cracking.

5. Safety valves (number, type, DN, PN, adjusted pressure).

6. Pressure gauges (number, scale, units, accuracy grade, calibration label number).

7. Discharge ports of safety valves.

8. Cooling system for pressure vessels (if present).

9. Charging rack and holding fixtures during charging.

10. Inspection and measurement system for gas charge quantity.

IV. Internal technical inspection

1. Residue condition.

2. Metal surface: Deformation, swelling, corrosion, cracking.

V. Durability and tightness tests

1. Test medium;

2. Test pressure;

3. Test duration;

4. Pressure gauge (scale, units, accuracy grade, calibration label number);

5. Medium supply equipment (type, model number);

6. Results:

+ Leakage condition;

+ Pressure drop;

+ Deformation condition.

VI. Operational test:

1. System condition;

2. Regulating pressure;

3. Charging pressure;

4. Safe equipment operation condition;

5. Measuring equipment operation condition;

6. Charging rack operation condition;

7. Cooling equipment operation condition.

 

Location:................................................................................................................................................................................

The minutes were prepared in................copies, each party retains................dated

We, the inspectors who carried out the inspection, are fully responsible for the accuracy of the comments and assessment results recorded in these minutes./.