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PURPOSE
The purpose of this method statement is to have a procedural activity for Auxiliary Boiler forNghi Son 2 BOT Thermal Power Plant Project.
SCOPE
This method is made for Auxiliary Boiler installation work with the Boiler proper,Economizer, Duct, Rorating equipment, … Including the related steel structure, platform, ladder,ect…
GENERAL
This method statement specifically pertains to the installation of the Auxiliary Boiler Any issues not addressed in this procedure will be resolved in accordance with the relevant drawings and standards.
Project:Nghi Son 2 BOT Thermal Power Plant uses technology of coal firing with capacity 2x600 MW.
Country: Socialist Republic of Viet Nam.
Plant type: Coal Fired Thermal Power Plant.
Main Contractor: Doosan Heavy Industries VietNam
ORGANIZATION
Organization Chart Of Lilama Corporation
ERECTION METHOD
P REPARATION
1.1 All packing shall be inspected for receipt opening.
1.2 Receipt inspection items are fllows.
- To confirm no missing package in transit by checking case number.
- To confirm no damaged package in transit.
- To check contents for damage and shortage from the packing list
2.1 Establishment of base line: Base lines for the utility boiler erection are the boiler centerline and drum centerline All reference lines are to be established from these base lines.
2.2 Foundation and anchor bolts (holes) in the foundation shall be inspected prior to the placement of packer plates or equipment on the foundation.
- Foundation shall be checked for location and elevation using the reference lines and a benchmark Allowances are as follows. o Foundation location ± 5mm
The difference between the actual centerlines and reference lines should be carefully monitored, with a foundation elevation tolerance of 1 mm per meter (1/1000) Additionally, the grouting space beneath packer plates must be maintained between 20mm and 50mm unless specified otherwise, and any discrepancies should be corrected through chipping and filling as needed.
- Anchor bolt locations and corresponding holes in the base plate of the equipment shall be checked to insure that all components match.
Anchor bolts must be projected sufficiently to ensure that the tops of the bolts are flush with the upper surface of the nuts after the equipment is installed and the bolts are tightened.
Anchor bolts must be straight, plumb, and free from damaged threads Any anchor bolts that are damaged or incorrectly positioned should be repaired or replaced, with a strict requirement that all improperly located anchor bolts must be replaced.
- Packer plates are used to secure the elevation of equipment installation. Their sizes are not restricted but 100 x 50 x 10mm in general, and not to be protruded from base plates.
The number of packer plates must be determined to ensure that the grout beneath them can adequately support the load of the installed equipment This is crucial because the packer area bears the entire weight of the equipment until the base plate is properly grouted.
- For the arrangement of packer plates, the stability of the equipment installed on them shall be considered.
- The foundation surface to be grouted shall be chipped to remove inferior quality of the surface and also to coarsen the surface for grouting.
To ensure proper foundation preparation, apply the appropriate amount of mixed grout with minimal water, maintaining a cement to sand ratio of approximately 0.5 by volume Immediately place the packer plate onto the grout and adjust its surface to achieve the specified height, ensuring it remains horizontal.
- NS2-XB00-P0UHA-120001 Foundation Drawing & Loading Data
- NS2-VN03-P0UHA-120001 Arrangement Drawing of Steel Structure
B OILER & D UCT INSTALLATION
After curing the grout for the packer plates of the boiler, the next step is to begin the installation of the boiler proper This process should be carried out in accordance with established guidelines for boiler package erection.
- Fix the base frame on its correct position to be located. b Non-pressure part and others (2 nd STEP)
- Air duct : Channel or Wood-Rail installed to height of duct support foundation., air ducts shall be installed according to the drawings.
6.2.2 Erection allowance a Level of Boiler base
Within 0.5/1000 b Location of Boiler proper
(Boiler center line, Drum center line) is ± 2 mm
S TEEL STRUCTURE INSTALLATION
This paragraph is applied to structures such as burner operation floor, boiler operation platforms and supporting structures for equipment and piping.
- Anchors and packer plates shall be previously installed in conformance with drawings, and at proper elevation, lines and level prior to installing structural members.
- Final tightening or welding of connections shall not be performed until whole of the individual structure has been properly aligned.
All joint surfaces, including areas around bolt heads, nuts, and washers, must be free from loose scale, burrs, dirt, or any foreign materials that could hinder proper seating of the components However, tightly adherent mill scale is permissible.
Drift pins can help align structural members, but they should not be used to force incorrectly manufactured components into position Any slight misalignment of bolt holes can be effectively addressed through reaming.
- Field welding of structure shall be performed as shown on drawings.
- Some structure members that may obstruct the subsequent erection works shall be installed afterwards.
- Bolted parts shall fit solidly together when assembled and shall not be separated by gaskets or any other interposed material.
The surfaces of bolted components in contact with the bolt head must maintain a slope no steeper than 1:20 relative to a plane that is perpendicular to the bolt axis If the slope exceeds this ratio, beveled washers should be utilized to address the issue of non-parallelism.
To effectively tighten a bolt, hold the bolt head while turning the nut If access is limited and prevents proper bolt placement or the use of a tightening device, it is acceptable to tighten from the bolt head with the nut securely restrained.
The required bolt size and length for each connection are specified in the drawings It is essential to use the connection bolts exactly as indicated; failure to do so may result in an excess of some bolts while others may be insufficient.
- Proper washers are to be used for each bolt on the sides of bolt head and nut.
- Projection lengths of bolts beyond the nuts are to be approx 5mm.
- Threads of bolts and nuts shall be free of any foreign matters and defects.
- NS2-VN03-P0UHA-120001 Aux Boiler - Arrangement Drawing of Steel Structure.
- SHOP DRAWING OF BOILER STEEL STRUCTURE
R OTATING & STATIC EQUIPMENT
- Refer to document no NS2-DD09-P0ZEN-740012 Method Statement for Rotating and Static Equipment Installation
P IPING INSTALLATION
- Refer to document no NS2-DD09-P0ZEN-740008 Method Statement for Boiler &BOP Piping Installation
S TACK INSTALLATION
The main stack includes the top and bottom sections, platforms, ladders, and personal protection equipment It is crucial to lift each section into an upright position slowly and carefully to prevent dynamic movements caused by the crane during the lifting process.
First of all, bottom section is set on the foundation of main stack.
Gusset plates for temporary scaffolding, designed for field connections between the bottom and top sections, are available at EL+19800 It is essential to install the temporary scaffolding prior to lifting the bottom section if needed.
Each section are assembled on ground and then lift-up the section (Ladder & Platform).
This alignment is important to reach a subsequent perfect straight orientation of the main stack.
Field weld joints between the top and bottom sections must be executed using temporary scaffolding or permanent platforms Additionally, it is essential to determine whether platforms and handrails should be installed on each stack section prior to lifting.
Checking of correct alignment shall be conducted between fields joint.
Lifts of top section shall be done under allowable wind speed to assure the safety during the lift.
Grouting of stack base ring is recommended when the stack is supported by a concrete foundation or elevated concrete pad.
Once the stack is fully erected and aligned vertically, and the anchor bolts have been properly torqued, it is essential to grout the gap between the base plate's bottom and the foundation's top.
The grout shall be a non-shrink type and shall harden free of bleeding or drying shrinkage when mixed and placed at any consistency.
After erection, remove reinforced temporary support which is installed inside stack shell.
Note: At the time of erection, the stack shall be true and plumb to within 2in.(50mm) in 100ft.
D EARATOR INSTALLATION
The deaerator consists of the storage tank deaerator, platforms and ladders Lift-up a section in turn into an upright position carefully and slowly to avoid dynamic actions.
First, storage tank is set on the foundation of steel structure.
Temporary scaffolding for the field connection between the storage tank and deaerator is provided at elevation EL+14650 It is essential to install the temporary scaffolding prior to lifting the deaerator if needed Each section will be assembled after the section has been lifted, including the installation of the ladder and platform.
M ANPOWER
Base on the progress and manpower for erection work of Auxiliary Boiler will arrange as follow:
Pos Position and carrier Quantity Remark
E QUIPMENT & TOOLS
Equipment and instrument table for testing work
Pos Description Unit Q’ty Remark
ENVIRONMENT, HEALTH AND SAFETY
7.1 Safety regulations for execution vehicles:
- All connection details for elevation, combination and installation before, during and after production must be accepted in accordance with regulations on ISO quality management system.
Ensure that all execution and combination equipment on-site is regularly checked, maintained, and load-tested in compliance with TCVN 4244-86 regulations for elevation equipment safety Additionally, verify that the inspection certificate remains valid.
The site leader is responsible for selecting the team leaders and staff authorized to participate in the lifting and installation of equipment, such as the main beam and steam drum Only individuals who have undergone training in the execution process and safety measures, and have received safety cards from accredited agencies, are permitted to work Additionally, workers must pass a medical examination from qualified medical agencies and obtain a certificate of good health prior to commencing their duties It is essential that all personnel are equipped with appropriate personal protective equipment (PPE) tailored to the working conditions, including shoes, protective clothing, hard hats, gloves, anti-dust masks, and seat belts, and that they wear this equipment at all times Strict regulations prohibit the consumption of alcohol, beer, and drugs before and during work hours on-site Furthermore, workers are only allowed to travel within their designated work areas and must not enter other areas without prior permission.
In the construction industry, safety regulations mandate that equipment and supplies, including cranes, electric hoists, oxygen bottles, gas cylinders, and pneumatic cylinders, must be licensed for use by the appropriate governmental authority Compliance with these strict safety requirements is essential to ensure the safe operation of machinery in the field.
- The equipment and materials on the site must be collected and fully protected when the working hours finishes.
- Preparing enough drinking water for workers in the working process.
- Necessary barricades, plates at the execution site must be arranged and guarded to prevent people from entering into dangerous areas.
In the workplace, employees are often exposed to electrical power through machinery and tools, necessitating strict adherence to safety regulations Only authorized personnel should operate electrical equipment, and all cabinets and appliances must be properly earthed Power distribution cabinets must be equipped with safety features such as circuit breakers and fuses Additionally, all power cables must be well-insulated and organized to prevent obstruction during material and equipment transport When working in confined spaces like dungeons or cellars, devices with a voltage of 36V or less should be used It is crucial to disconnect all power sources when machinery is not in use or under repair, and a clear signal indicating "No opening power source, it is in repair" should be displayed Only qualified personnel with electrical expertise should perform electricity-related tasks, with each team consisting of at least two qualified members Circuit breakers should be housed in weatherproof boxes elevated above 0.7 meters to ensure safety on construction sites.
- Specific detail safe work method for confine space works (inside the pipe and associated with hot work) shall be provided and added
- MSDS of any chemical shall be provided and added
Before commencing work in confined spaces, it is essential that all workers involved are trained in confined space procedures and emergency rescue methods An Emergency Response Team (ERT) should be present while work is conducted inside these areas Additionally, a tripod, pulley, and rescue rope must be installed for emergency situations All workers are required to wear safety harnesses equipped with D-rings Furthermore, two watchmen must be stationed both inside and outside the coal silo, ensuring effective communication through walkie-talkies.
7.5 Safety for Working at the high locations:
When working at heights of 1.8 meters or more, or lower heights with obstacles below, strict adherence to safety regulations is essential Only individuals with valid health certificates are permitted to work at these heights, and anyone found under the influence of alcohol or stimulants must be immediately removed from the area Workers are required to wear appropriate protective clothing, including hats with straps and safety shoes All equipment and work areas must be properly insulated, and seat belts must be worn, inspected, and load-tested prior to use The seat belts should be securely hooked, with the attachment point positioned at least two-thirds the height of the worker for optimal safety Electric and oxyacetylene welders must use leather belts, and all tools should be stored neatly in boxes to prevent falls It is prohibited to throw materials or tools between levels, and safety signage must be displayed around the work site to ensure awareness.
To ensure safety in high-risk operational areas, it is essential to restrict travel within a 5-meter radius Additionally, using wires or cables to secure hooks is crucial when moving around the operation floor Furthermore, covering the working platform is necessary to prevent debris from falling and to maintain industrial hygiene during the work process.
7.6 Safe use of lifting equipment in assembly & preparation work for testing:
- Operator of lifting equipment must be expertise, skilled and granted training certificate by legal training establishments.
- Be trained in the safe operation of the lifting equipment and issued card by the competent authorities.
- Must have been fully equipped with personal protective equipment in line with the work.
- Complying with shift hand-over process, before they control machines, they must check whether safe equipment (such as brakes, brake ratchet ), control structure are safe or not.
When operating lifting equipment, it is crucial to monitor the alarm clock for load levels and flip torque If the alarm indicates 80% load or higher, operators must immediately inform their supervisor to assign observers for assessing the balance of the equipment and materials Each operation should be conducted individually to prevent instability and ensure safety.
- When lifting or lowering, moving the lifting device or load, they must show signal to inform everyone around.
- When operating, they must observe the cables (chains, cylinder - lift tables) moving through the pulley (gear), to prevent it from being twisted, disordered or trapped.
- Only using lifting equipment to lift and lower volumes of materials in the vertical position, prohibiting using it in oblique direction or drag volumes of materials on the floor.
- When lifting equipment is operated near power transmission lines, it is necessary to follow safe distance under the power sector standards.
- Prohibiting moving below, or stand on the volume of materials when it is lifted, moved.
Effective communication between the turn signal and the operator of lifting equipment is crucial to ensure safety It is essential to prevent the beak hook from straying from the center of the material load during lifting, lowering, and assembly operations.
- Cable hook points, muffle hook, anchor winch must be solid and appropriate, crane cable must be in accordance with Vietnamese standard 4244-86.
A construction site leader must accurately assess and document the weight and dimensions of each material volume on at least two sides, allowing for a deviation of 900 Additionally, it is crucial to comprehend the load characteristics of the lifting equipment that will be utilized on-site to ensure safe and efficient assembly and removal processes.
To ensure safety and efficiency in handling substantial materials such as transformers, generators, control cabinets, pumps, technology machine clusters, valve matrices, and tanks, it is essential to utilize a cable system with a safety coefficient greater than 5 Additionally, the load on lifting equipment should not exceed 80% of its maximum capacity during operation.
- Prohibit using volumes of materials, architectural structures without permission of the investor as the hole or holding hoist, pulley.
- Prohibit using lifting equipment for lifting people during construction
- The premises must be cleared, the moving path must be flat without having any equipment or obstacles.
- When materials are loaded onto carts, its shaft must be chocked tightly and loaded with correct volume of materials.
When multiple porters are involved in loading materials, it is essential that their signals are consistent and their heights are approximately equal Additionally, they should carry the materials on the same shoulder, either right or left, to ensure efficient and coordinated movement.
- When transporting equipment by car, it is necessary to calculate the width and height of materials They must be tied and supported firmly.
- When transporting materials and equipment by roller, it is vital to choose roller with equal diameter, its length must be suitable with equipment to be transported.
- When unloading materials, hazardous substances, it is vital to have signal, shipping cranes have signs around each crane location.
- When transporting easily explosive materials, measures shall be taken in accordance with the responsible person’s regulations.
7.8 Safety precautions on using execution equipment and tools:
Before operating a chain hoist, it is essential to conduct a thorough inspection of its technical and working condition, including the hardness and solidity of the mechanical structure, the reliability of the brake system, and the integrity of the cross chain, load chain, and hook beak If these components meet safety requirements, the hoist can be used Additionally, when lifting or lowering loads, it is crucial to verify the condition of the hoist brakes by lifting a load to a height of less than 100 mm for a duration of 5 minutes; if there is no drift, the hoist is deemed safe for continuous use Regular maintenance and reliability checks of the chain hoist are also necessary to ensure safe operation.
When operating electrically powered machinery and equipment, it is crucial to ensure that all power supply cables are thoroughly insulated, and that connections, wiring points, and motor wiring boxes are properly covered Additionally, machine covers must be securely earthed, and installations should be situated in quiet areas away from traffic Operators must be designated by a responsible individual and receive proper training on machine operation Before undertaking any repairs, it is essential to disconnect all power to the machine Furthermore, machinery should be equipped with adequate safety devices, including fuses, relays, and automatic circuit breakers Regular inspections of grinding and cutting machines are necessary to safeguard against flying debris, and to ensure that grinding and cutting wheels are functioning correctly.
When using hand tools such as spanners, wrenches, and chisels, it is essential to maintain a firm grip within the control range for safety and efficiency Before each use, conduct a daily inspection to check for any damages, including cracks in the handle and issues with the cutting edge Ensure that all adjustable components are properly secured Hammers should have handles that are firmly packed and of medium length for ease of use Additionally, bore bits should be smooth and free of burrs Always store tools in designated containers or storage bags, and when working at heights, secure tools to prevent them from falling.
- On every day, after the work is finished, it is necessary to cleaning up the execution premises, waste, scraps, and collect it in safe places.
- All waste must be collected - transported - properly handled in accordance with owner’s regulations.
RISK ASSESSMENT AND JSA (JOB SAFETY ANALYSIS)
Workers worker abnomal physical condition ( Drunken & fatigue)
Trip/Fall 3 2 6 Check the health condition during the TBM 1 1 1
Worker not familiar with the scope of works or workplace hazards
1 2 2 TBM to be filled and discussed by supervisor to workers 1 1 1
2 4 8 checking the access roand before passing the area
3 3 9 Designate a signaman when moving the equipment keep the speed limmited 10km/h
Defective/Faul ty machinery or tools
Ensure all required pre-start checklist are carried out prior to start any work
4 4 16 Only a qualified and Certified operators Signalman, riggers should be in-place
Complied with Vietname Molisa regulations with Circular 44
Preparation of a lifting plan list and plans for lifts from 10 tons or greater.
Do not stand under the load and working radious of crane
Isolated lifting area and warning no access
Ensure loads are fixed with Wire sling correctly
All lifting equipment must be in good conditions
Experienced lifting supervisors at all times
Only lifting tools with color coding following site regulation allowed to use
All lifting tools must have identification tag (including serial number, certification number, SWL inspection date and due date)
Check the Windspeed beforre Lifting Windspeed 10m/s
Check the ground condition and level including any type of matting.
Squeez ed by the sling
Ensure that no one touch the load and wire sling before give the signal for lifting 2 3 6
Use proper hands PPE collision
Ensure distance between steel structure and crane in lifting plan study and communication between signal man and crane operator
Put taglines with enough length to the load from the ground during lifting for proper guide control.
Ensure that no one stay within the restricted area from the load before lifting.
Barricade the loading / unloading area and crane working radius Designate only one Signalman for Lifting and / or additional signal man for every location ( if nessessary)
Resi dual Rate (RR N) Scafolding work falling hazard, falling from height
Lack of experien ce and knowled ge/ not adequat e PPE
4 2 8 All scaffolders must be trained and tested with scaffolding course in training centre of DVN’s Training and trained person entering working at height only.
All scaffolders must be had scaffolding certificate from the third party And qualified by DVN EHS scaffold supervisor.
All scaffolders who is working at height shall be inducted and got certificate from MOLISA ( Circular 44)
All workers must be equipped with Safety helmet & strap chin, safety google, fall arrestor device, clothing uniform with yellow helmet and sticker " Scaffolder"
All employees shall follow manual handling methods
Ensure all are wearing necessary PPEs
Ensure the dismantling is done only by the following the dismantling procedure
Dismantling of scaffolding is not allowed during head wind
Adequate supervision shall be available at site during dismantling permanent injury for worker
Non- complia nce of DVN’
EHS Procedu res and permit to work
Before starting any work on-site, it is essential to obtain a valid Permit to Work (P.T.W) and ensure it is accessible throughout all activities For confined space operations, a confined space entry permit must be secured from the area authority before commencing work Additionally, gas testing should be conducted prior to the installation of scaffolding within the confined space.
( Scaffolding PTW applied from 10m and over and it was approved by DVN’s EHS)
Job specific T.R.A to be made available at the site & control measures to be communicated to all personnel involved in the job through Tool Box Talk Meeting
Job specific Tool Box Talk to be filled up prior to the commencement of work and to be kept in the site. permanent injury for worker
Fall of material /Trips & fall, stuck by personal
Avoid gaps in between planks
Ensure that overhang is not more than 50 mm at the edges
Provide toe boards to avoid fall of materials and guard rails to prevent the fall of persons Major injury Sharp edged tools Cut injury/
4 2 8 Ensure all hand tools are inspected and approved
Ensure trained and experienced employees are assigned to the job.
Pinch Point/D efected hand tools/De fected /
Ensure all hand tools are checked for their good working condition prior to the start of the job by operators or users.
Ensure no defected/ handmade/modified tools are available at site
All portable handtool shall be tie by layard for falling protection.
Injury/i mproper ty erected scaffoldi ng, partial/c ollapse scaffoldi ng, damage material s or structure , unqualif ied personal injuried or death, unautho rized
Scaffolding inspector shall visually inspect the scaffolding is erected as per procedure by qualified personnel's supervision
Ensure the materials used for the construction are graded
During inspecting the higher level platforms Inspector shall maintain 100% tie-off
All scaffolding must be inspected by a certified scaffolding inspector after inclement weather, after a period of seven days, or following any temporary work performed on the structure The inspector's findings should be documented on the scaff tag and recorded in a maintained register.
No person other than a scaffolder and/or his helper may be on a
Workers are to check the condition of all equipment for defects prior to use: cables & connections, earth clamps, inspection tag and electrode holder 1 4 4
Proper earthing and connection of welding machines and generators
Proper PPE to be worn at all times
4 3 12 Fashback arrestor and gauge should be installed prior to use cutting by Gas cylinders
Always wear appropriate PPE (welding mask, welding gloves, welding jacket, Arpon).
Workers are to check the condition of all equipment for defects prior to use
Check all electric tools prior to use by competent person and color tagged.
Check panels and earthing lines.
No working on wet surface.
All guards & safety features are to be operable
Ensure that right disc are used for a certain job, cutting disc for cutting and grinding disc for grinding.
Ensure that the RPM of disc is higher than the RPM of the grinder
Do not use damaged or wet disc.
Using proper PPE as face mask protection
Work at height or ladder
Work at height without proper working platform
Ensure that installation of proper working platform such as scaffolding with highest standard
The lifeline must consist of a minimum 12 millimeter wire rope or possess a design capacity of 22 kilo-Newtons Safety nets are required for workplaces exceeding 7.5 meters in height Additionally, workers must wear safety harnesses before commencing work, ensuring that lanyards are securely connected to an appropriate anchor point.
5-minute safety training before work
Improp er storage material / tools
Put the material in secure container.
Tie the tools to your safety belts or harness with rope having enough length to reach the working point connection.
Prevent unauthorized entry the area can be had falling object by securing area with barricade and signage.
Installation of safety net for prevent falling object if needed Ensure that wearing the proper PPE
Mitigating Controls L1 S1 Resi dual Rate
Confine space entry work suffocation,Pre sence of residual harmful fume, dust, smoke
Use mechanical air movers (in/out) for ventilation.
Check the oxygen level prior to entry on confined space
Ventilation and extraction should be performed at least (30) minute before the entrants are allowed to go inside the CS.
Ensure atmosphere is safe by having oxygen concentration between 19.5% & 23.5% and should be monitored and maintained.
Workers should undergo a mandatory Confined Space training before allowing to enter the CS.
Gas free test tobe conducted by a competent person before and during the work confirm the level of toxic substances does not exceed the permissible exposure limit.
The confined space shall be monitor continuously using at least 1 no of 4 in 1
Ensure the 4 in 1 gas meter is having a valid calibration cert.
Every day, all workers must receive a briefing on the hazards associated with confined spaces and the necessary control measures before starting their tasks In the event of a gas monitor alert, all work must cease immediately, and workers should evacuate the area without delay while notifying the supervisor in charge.
In our team of two or three members, it is essential to accurately log entrance and exit times on the designated paperwork Remember to check the time when donning your oxygen mask, work diligently until the assigned end time, and complete your shift as scheduled.
Emergency Failure to comunic ation device or walkies
4 4 16 Following procedures and actions are to be followed in a case a victim is to be rescued from an enclosed space:
Raise the alarm and inform Master
Obtain necessary assistance and equipment including medical support
Lifelines, breathing apparatus, resuscitation equipment and other items of rescue equipment are ready for use
First aid squad fully equipped near to the scene
Use approved VHF/UHF radios The officer in charge of the rescue must remain outside the space, where he can exercise the most effective control
Before entry, officer in charge must inform in briefly the squads about the peculiarities of the relevant space (if possible consult relevant plan)
During rescue operation adequate ventilation shall be provided continuously
Any case in emergency contact to DVN’EHS Department and LILMA HSSE Department with Telephone number:
Resi dual Rate (RR N) Gratting installation falling hazard, falling from height
May be falling objects , workers may falling from hole opening cause fatal injury, serious injury
All workers must be training and have to take part in TBM and compliance with PTW ( grating and handrail removal permit)
Before removing a grating or handrail, it is essential to install a sturdy barricade or guardrail that completely surrounds the opening, or to ensure that the opening is properly covered.
When using floor hole covers, they must be designed to support at least twice the weight of any individuals or equipment that may come into contact with them, ensuring safety and preventing failure.
Be cleated or secured by means of wire tie downs, clips, or other equivalent fastening method.
-visibly identify the hazard on the cover ( DANGER – HOLE COVER- DO NOT REMOVE)
- All signal boards, tags, hard barricade must be available.
Frequency * Prepare Job Safety Analysis and Safety Checklist when
2:Remote ** Prepare Safety Verification Checklist when RFN is
4:Likely/Probable L1 : Likelihood as is
5:Very likely/Frequent L2 : Likelihood with mitigating controls in place
1.Negligible S2 : Severity with mitigating controls in place
Risk Factor Number ( RFN) Residual Risk number ( RRN)
6.-9: Moderate/Acceptable with review 6-9: Moderate/Acceptable with review
Prepared by Mr Le Thanh Hai Approved by:
Position: LLM HSSE Manager Position
NGHI SON 2 BOT THERMAL POWER PLANT PROJECT ( Depveloping a habit of analyzing method to identify hazards & unsafe practices than developing solusions that control, minimize or elmininating hazards)
Prepared by Mr Le Thanh Hai Reviewed by Mr Approved by Mr.
Original date: Revised by: Revised date: Revision: A
PPE required (Tick as applicable – state > category/specific type)
Gloves: Face shield Barricade needed
LIST OF ALL JOB STEPS LIST OF ALL KNOWN HAZARDS HOW TO ELIMINATE HAZARDS Transportation of Equipment &
Crash/Traffic accident Falling marials and equipment from trailer or truck.
1 All Truck and trailer operators must be got EHS conduction from DNV EHS training center and had certificate following Vietnam Molisa regulations
2 Check The access road before passing area
3.Designate a signalman when moving equipment
Lashings, including webbing, chains, cables, or clamps, must be regularly inspected for damage to ensure they remain in serviceable condition and maintain proper tension To protect both the load and the lashing from potential damage, especially when passing over sharp edges or corners, it is essential to use sleeves and corner protectors.
5 Ropes and buckle straps suspended from a roof rail and/or the curtains of a standard curtain-sided vehicle are generally not suitable for securing a load.
Heavy lifting work - loading and unloading
Potential fatality and serious injury due to lifting work Fataliy/Serious injury to workers
Soft/unevent ground may cause crane topple
Potential fatality to workers property damage
Over loading of crane’s SWL may cause crane toppled
Damaged sling –unsecured loose materials
High potential fâtl incident and damage to property.
Regular inspections and maintenance of lifting tackle under DVN EHS control must be conducted by a qualified individual, with a register maintained for documentation This equipment check should include thorough evaluations for deformation, cracks, or any faults in wire slings, hooks, shackles, swivels, spreader bars, and shear legs or similar equipment.
To ensure safe crane operations, it is essential that the ground bearing is tested and approved by a qualified professional If needed, steel plates should be laid down to provide a stable base for the crane Additionally, the lifting supervisor must maintain visibility and oversight throughout the lifting process to guarantee safety and efficiency.
3.Adhere to approved lifting plan
4 Ensure a valid permit to work5.All necessary check list to be update6.Wire slings must be properly srored off the ground without casing kinking
Rigging improper method,high potential fatality due to falling object
Wire slings must undergo thorough cleaning and inspection both before and after use The issuance and management of these slings should only be conducted by a qualified individual Additionally, each wire and web sling must be assigned a unique identification number, and a comprehensive register of all slings should be maintained.
10.Besides the regular inspection following their use, Wire slings and websling must be inspected on monthly basicand the finding entered on the record sheet.
Worn slings must be cut into two and properly disposed of: Not allow:
1 Using a wire sling over sharp corner without padding.
2.Force the sling into position 3.Overload the slings 4.Use a damaged slings, or one that is worn
When lifting loads, it is essential to drag a sling from beneath the load to ensure safety and efficiency Additionally, allow loads to safely pass over a slog positioned on the ground Always remember to adhere to the approved lifting plan throughout the lifting process to maintain compliance and prevent accidents.
7.Lifting supervisor to ensure the proper centre of gravity.
(Lifting supervisor brief the method statement in TBM)
Suspend the load 300mm above ground and confirm stability
1.Ensure a valid permit to work is in placed before work commecement 2.lifting planin placed before lifting 3.Only appreciated and compentent rigger to carry out rigging
4.inspect lifting gear prior to use 5.Any person employed on site as a rigger shall be trained and experienced in this capacity.
2riggers working on scaffoldingand /or steel structure must not wear soft shoes unless they approved steel capped toe safety type.
Protective gloves must be worn when hadling wire ropes
Gratting installation and removal 1.High potential falling object due to fall or material drop down.
2.Pinch point, serious ịnury hand
1 All workers must be trained by DVN EHS and comply with safety regulations with working at height.
1.1 comply with P.T.W ( Grating and handrail removal permit)
1.2 Before removal grating on the floor of Boiler must be identified gratting’s location exactly and install hardbarricade for isolated and prevent worker access.install warning signalboard “ Warning oppening hole
1.3.Workers in this task have to using the hooks for falling protection - hanging gratting during the time remove or installation.
1.4 All portable handtool machine or tools as scratch spanner, or portable drilling machine must be secure with layards for falling protection.
Ergonomic and manual handling must be trained and TBM before working in this task.
Equipment and material preparation for temporary facilities
1.Collision between machine, overturing may cause death or permanent injury, collased
2.Uneccessary movements of equipments a person that causes injury
3.Equipment oil leak drung operation
1.Alway keep the site clear of any obstruction
1.2.Toolbox talks on daily basic 1.3Adequate warnign signalboard 1.4 Checklist on all vehiclé must be provide every day.
1.5 Siren for warning before lifting. 2.Designate a signalman who wear the hi –vest suite to control the work 2.1 Heavy machinery should have backward movement warning light beacon.
2.2 Equipment used to clear the site should be controlled and sorted by bankman
2.3 Provide safe entrance and exit way for the workers going to the area 2.4 All vehicles entering on the site must turn on their headlights day and nighttime
3 Daily check of the equiment prior to work
Working and operation during night time
1.working operation of the equipments may cause serious injury to personnel due to:
2.Generator (Diesel equiment oil leakage)
1.Must provide sufficient lighning on the entire working area
1.2 All equipments must be ensure all lights are operation
1.3Supervisor must always be present for entire working
1.4 All workers must be wearing proper PPE ( Hi –Vest)
1.5First aid box should be prepared for the first aid in case injury.
1.6.Temporary electrical system must be used and connect 03 core and separated distribution panel ( with ELCB with electrical leakage 30ma) and avoid from any water effect
To ensure a safe working environment, it is essential to provide secure accessways and exit routes for the workforce All electrical cables should be suspended at least 2 meters above the ground and utilize industrial sockets and plugs Additionally, conducting daily equipment checks before commencing work is crucial for maintaining safety standards.
2.1.Regular inspection and monitering of the equipment prior to use.
2.2 Provide secondery containment protection under the equipement to prevent contamination soil by oil spillage
3.Diezel chemical shell be stored in secondary containment and MSDS must be showed and communicated to all workers who concerned.
All hazardous waste should be properly collected and stored in designated hazardous waste disposal bins It is essential to hand over this waste to DVN EHS for treatment by Nghison Environment Company, in accordance with Vietnam's environmental regulations.
Welding and cutting work Electrical shock, fire, burn to body and injury to eye may cause death or permanent injury
Fire accident due to electrical wire aging during welding
All employees are required to undergo specialized hot work training at the DVN EHS training center Additionally, they must be equipped with essential personal protective equipment (PPE), including safety masks for face protection, welding or cutting face masks, leather gloves, and aprons.