Method Statement for Leakage Repair Pressure Injection

Method Statement for Crack Filling and Leakage Repair by Injection Method | How to Repair a Water Tank Leak with Pressure Injection | Method Statement for Leakage Repair Pressure Injection

In this blog post, we’ll discuss our method statement for repairing leaks using pressure injection. You’ll learn about the tools and materials required, as well as the step-by-step process involved in the repair

Purpose and Scope

The specification for pressure injection grouting works includes locating leaks and repairing/stopping leaks to the complete satisfaction of the consultant, and client.

Duration

The timetable for pressure grouting works shall be in accordance with the program submitted for each individual activity. Any gap in duration, while the pressure grouting works are in process, must also be scheduled so that the end date is met.

Workforce

The site engineer, execution team, or subcontractor shall appoint a competent representative to execute and manage the works, as well as take directions from the engineer. During working hours, one person from the execution team must be on-site.

The execution team shall at all times employ as much labor as is necessary, including a specialized and experienced team, for the proper progress of the work as planned, and shall on demand furnish, from time to time, such returns as the Engineer may require of the number of skilled and unskilled labors and supervisory staff employed on the work.

Plant and Equipment

The following is a list of the necessary equipment:

• Injection pump with seal boss pressure grouting
• Drilling equipment
• Plug/packer for injection injection
• Scraper
• Brush with a wire
• Air blower
• Small hand tool

Engineering and Design Works

According to the manufacturer’s recommendations.

Health and Safety

The manufacturer’s Material Safety Data Sheet (MSDS) must be followed.

Activities

General Surface Preparation
Application of Nitofill WS 60
Application of Nitofill UR 63
Repairing drilled hole.

Risks and Hazards

Undulating land
Hot Sunrays
Hot Weather
Fall of heavy things (stone, boulders, earth, etc.) into the excavated pit
Persons falling into pits due to caving
Dust
Underground cables, wires, and so on
Congested work site
Noise during rock breaking
Heavy equipment operation
Sharp/heavy materials such as projecting nails wooden planks etc.
Defective tools – chisel, hammer, nail remover, etc.
Heavy/sharp items
Defective machinery: faulty hand tools
Incorrect tool use Cement (by contact)
Inhalation of cement dust Noise
Heat stress
Faulty lifting equipment, improper use
Chemical Insecticide and Germicide
Water Contamination
Food Contamination
Contact with the skin/clothing
Contact with the eyes
Other Material Handling Hazards: Swallowing (Ingestion), Inhalation, Splashing of cement mix

Other Material Handling Hazards:

• Tool Box Meeting
• Use of correct PPE
• Follow Procedures
• Keep adequate warning signs and barricade inappropriate
• Use skilled personnel to ensure overnight safety
• Deploy the appropriate person for the right job, with all necessary licenses.
• Provide proper job-specific training; use appropriate tools and tackles; provide first aid and drinking water; and deploy well-maintained lifting and shifting equipment.
• Control traffic, parking, and vehicle and equipment movement
• Proper Housekeeping
• Begin the work only after confirming that it is safe in all ways.
• Continue work only if it is safe; stop work if it is not safe; identify assembly point; provide information to ROP regarding oversize consignment transport; pilot vehicle
• Emergency Contact: (shall be included in the project safety plan)

Recovery Measures:

In the event that an unwanted event or incident occurs at the worksite or residential camp, despite the essential HSE protection systems and procedures in place, the situation must be handled in such a way that human injury or damages are minimized and control is regained as soon as possible.

In such cases, the following will be the action plan:

In major incidents such as fatalities, severe human injuries, fire, explosion, etc., and natural calamities (flood, rain, wind, sand storm, etc.), work will be halted immediately, and appropriate emergency response procedures will be implemented in accordance with existing procedures.

The situation shall be communicated to the client and other key personnel by the simplest possible means, with the goal of obtaining assistance and advice.

Further work will begin only after the client has given his approval.

Toolbox meetings will be held for all staff to explain the HSE component of the incident, the immediate and underlying causes of the incident, and the corrective / control measures required to prevent future occurrences of such situations.

Other than natural disasters, a thorough investigation will be conducted into the incident, and the lessons learned will be distributed to the workforce.

In less serious circumstances, first aid or clinical aid shall be administered to any injured victims, and the matter shall be communicated to all parties involved, including the Client.

Adequate first aid kits must be installed, and trained first responders must be on-site.

Permit and Access

The execution team shall organize and provide temporary works such as roadways, staging, and earthen formations to allow access for individuals, vehicles, and equipment needed for the works, and shall remove the same upon completion.

Execution, through its authorized representative, should organize and obtain the necessary licenses from the appropriate authorities for safe working in the work area.

Workflow Sequence-Method Statement for Leakage Repair Pressure Injection

General

The specification for pressure grouting works includes locating leaks and repairing/stopping leaks to the complete satisfaction of the customer, consultant, and client.

Surface Preparation

Complete and correct substrate preparation is critical for complete repair adhesion.

Clean the surface near the cracks with water to eliminate all residues of dust, oil, paint, curing compounds, grease, corrosion deposits, algae, or any other unsound material.

If the water allows, the surface should be prepped with an air blower and sandpaper.

Nitofill WS 60 Application

Nitofill WS60 is a two-part liquid polyurethane that is mixed in the proportions supplied and injected into cracks in concrete.

Identify and mark the leakage site.

Drill a hole large enough to accommodate the injection plug/packer. The diameter of the hole must match the size of the injection packer.

Using an air blower, clean the hole.

Injection packers should be inserted into the pre-drilled holes at regular intervals along the crack’s length. The spacing between packers must be determined by the length and width of the crack. Normal spacing would be between 100 mm and 500 mm.

Packers should be inserted along the crack/at 45 degrees to the crack or as needed for the site conditions.

Seal the surface of the cracks between the packers with a band of Nitomortar FC 30 to 40 mm wide and 2 to 3 mm thick if possible. This method must be used to seal both sides of cracks that lead through a wall or slab. The Nitomortar FC application can be skipped if the water flow is interrupted.

Making a mixture

Manually combine the accelerator/hardener and the base resin before placing them in a tight container. When mixing, take care to keep as much moisture out as possible.

Nitofill WS60 should be injected with conventional injection equipment.

On vertical cracks, one end of the injection hose must be attached to the lowest packer, and on horizontal cracks, one end must be attached to either end.

Pressure should be applied slowly by gently pressing the gun trigger until the resin stops flowing or begins to flow out of the joint or the next packer.

Pressure will be released from the gun, and injection will proceed to the next location/packer.

Each crack must be treated in a signal continuous operation, and sufficient material must be made prior to the start of the work.

After a few hours, re-inject Nitofill WS 60 if necessary. Continue using Nitofill UR 63 if the leakage is under control/arrest. Clean the injection machine and accessories with thinner.

Nitofill UR 63 Application

After bringing the running water under control with Nitofill WS 60.

Nitofill UR63 should be injected using normal injection equipment with closed containers through a pre-inserted plug/packer.

Making a mixture

Manually combine the accelerator/hardener and the base resin before placing them in a tight container. When mixing, take care to keep as much moisture out as possible.

Each crack must be treated in a signal continuous operation, and sufficient material must be made prior to the start of the work.

On vertical cracks, one end of the injection hose must be attached to the lowest packer, and on horizontal cracks, one end must be attached to either end.

Slowly apply pressure by gently squeezing the gun trigger until the resin stops pouring or begins to flow out of the joint or next packer.

The gun’s pressure should be released, and the injection should proceed to the next location/packer.

Continue as above at all injection places, then let at least 6 hours for curing.
Injection packers must be removed and the concrete surface cleaned with a wire brush.
Use thinner to clean the injection machine and its parts.

Drilled hole repair

Using appropriate tools, remove the projected part of the injection plug/packer.

Clean the concrete surface of loose particles and Nitofill deposition.

Fill the hole with concrete patching mortar according to the manufacturer’s instructions.

General

Reminders Keep enough materials, plants, workers, and tools on hand to ensure that application is a continual process.

Avoid using the equipment and chemicals during the hottest hours of the day, and keep them in a cool/shaded area.

Unmixed components should be stored in a cool/shaded environment.

To avoid choking/blockage, clean the injection machine on a regular basis with thinner.

Attachment

Nitofill WS60 Technical Data Sheet
Nitofill UR 63 Tech Data Sheet

tag: Method Statement for Leakage Repair Pressure Injection