Industrial plants depend on continuous operation — every hour of unplanned shutdown means lost productivity, delayed deliveries, and higher costs. Online leak sealing is one of the most effective maintenance methods for keeping your systems running safely and efficiently, without interruption.
In this guide, the experts at Metal Stitch explain what online leak sealing is, how it works, and why it’s essential for modern industries.
In this guide, the experts at Metal Stitch explain what online leak sealing is, how it works, and why it’s essential for modern industries.
🔍 What Is Online Leak Sealing?
Online leak sealing (also known as on-stream leak sealing) is a specialized process used to seal active leaks in pressurized systems such as pipelines, valves, heat exchangers, and pressure vessels without shutting them down.
Instead of replacing components or halting production, a custom-designed clamp and injection compound are used to stop the leakage safely while the system remains live and fully operational.
This technology is widely used in oil & gas, petrochemical, power, steel, fertilizer, and marine sectors — wherever continuous production is critical.
⚙️ How the Process Works
Leak Assessment:
Engineers inspect the leak location, fluid type, pressure, temperature, and geometry to design a suitable sealing solution.
Clamp Design & Fabrication:
A tailor-made enclosure or clamp is fabricated to fit the leaking area, conforming to ASME PCC-2 and API 510 standards.
Installation & Injection:
The clamp is installed on the live line, and a sealant compound is injected through fittings until the leak path is completely sealed.
Verification:
Pressure and temperature are monitored to ensure the leak is permanently contained, and the area is certified safe for continued operation.
🧰 When to Use Online Leak Sealing
Online leak sealing is ideal for:
Leaking valve bonnets, flanges, elbows, tees, or pipe joints
Systems where shutdown is technically or economically impractical
Leaks caused by corrosion, gasket failure, or pinholes in welds
Emergency repairs requiring immediate action
🧩 Benefits of Online Leak Sealing
No Shutdown Required – Repairs are performed while the plant remains in full operation.
Cost-Effective – Avoids loss of production and expensive replacements.
Safe & Controlled – Procedures follow international standards and are performed by trained engineers.
Versatile – Works across a wide range of pressures (vacuum to 414 bar) and temperatures (cryogenic to 927 °C).
Environmentally Friendly – Prevents emissions and product loss.
🏗 Materials and Equipment Used
At Metal Stitch, our leak sealing systems include:
High-strength clamps and enclosures (ring, box, tee, elbow types)
Injection adaptors and restrictors (EN8/EN24/SS grades)
Specialized leak sealing compounds compatible with process fluids
Certified high-pressure injection pumps and safety fittings
Every clamp is pressure-tested, NDT-verified, and manufactured to match specific operating parameters.
🔧 Safety and Compliance
Safety is at the core of every leak sealing job.
All materials and procedures comply with ASME PCC-2, B31.3, and BPVC Section VIII codes.
Our technicians are trained in confined-space, high-pressure, and hot-work safety protocols.
Full documentation and leak-test reports are issued after every repair.
🌍 Why Choose Metal Stitch
With over three decades of experience, Metal Stitch Industrial Services has established itself as one of the region’s most trusted names in online leak sealing.
24/7 rapid response teams across KSA & GCC
In-house clamp fabrication and testing facilities
Proven track record across oil & gas, petrochemical, and power sectors
Commitment to safety, compliance, and reliability
✅ Conclusion
Online leak sealing is not just a temporary fix — it’s a proven engineering solution that helps industries maintain uptime, reduce risk, and extend asset life.
At Metal Stitch, our combination of field expertise, certified technology, and rapid response ensures your operations stay safe, compliant, and productive — even under pressure.
Online leak sealing (also known as on-stream leak sealing) is a specialized process used to seal active leaks in pressurized systems such as pipelines, valves, heat exchangers, and pressure vessels without shutting them down.
Instead of replacing components or halting production, a custom-designed clamp and injection compound are used to stop the leakage safely while the system remains live and fully operational.
This technology is widely used in oil & gas, petrochemical, power, steel, fertilizer, and marine sectors — wherever continuous production is critical.
⚙️ How the Process Works
Leak Assessment:
Engineers inspect the leak location, fluid type, pressure, temperature, and geometry to design a suitable sealing solution.
Clamp Design & Fabrication:
A tailor-made enclosure or clamp is fabricated to fit the leaking area, conforming to ASME PCC-2 and API 510 standards.
Installation & Injection:
The clamp is installed on the live line, and a sealant compound is injected through fittings until the leak path is completely sealed.
Verification:
Pressure and temperature are monitored to ensure the leak is permanently contained, and the area is certified safe for continued operation.
🧰 When to Use Online Leak Sealing
Online leak sealing is ideal for:
Leaking valve bonnets, flanges, elbows, tees, or pipe joints
Systems where shutdown is technically or economically impractical
Leaks caused by corrosion, gasket failure, or pinholes in welds
Emergency repairs requiring immediate action
🧩 Benefits of Online Leak Sealing
No Shutdown Required – Repairs are performed while the plant remains in full operation.
Cost-Effective – Avoids loss of production and expensive replacements.
Safe & Controlled – Procedures follow international standards and are performed by trained engineers.
Versatile – Works across a wide range of pressures (vacuum to 414 bar) and temperatures (cryogenic to 927 °C).
Environmentally Friendly – Prevents emissions and product loss.
🏗 Materials and Equipment Used
At Metal Stitch, our leak sealing systems include:
High-strength clamps and enclosures (ring, box, tee, elbow types)
Injection adaptors and restrictors (EN8/EN24/SS grades)
Specialized leak sealing compounds compatible with process fluids
Certified high-pressure injection pumps and safety fittings
Every clamp is pressure-tested, NDT-verified, and manufactured to match specific operating parameters.
🔧 Safety and Compliance
Safety is at the core of every leak sealing job.
All materials and procedures comply with ASME PCC-2, B31.3, and BPVC Section VIII codes.
Our technicians are trained in confined-space, high-pressure, and hot-work safety protocols.
Full documentation and leak-test reports are issued after every repair.
🌍 Why Choose Metal Stitch
With over three decades of experience, Metal Stitch Industrial Services has established itself as one of the region’s most trusted names in online leak sealing.
24/7 rapid response teams across KSA & GCC
In-house clamp fabrication and testing facilities
Proven track record across oil & gas, petrochemical, and power sectors
Commitment to safety, compliance, and reliability
✅ Conclusion
Online leak sealing is not just a temporary fix — it’s a proven engineering solution that helps industries maintain uptime, reduce risk, and extend asset life.
At Metal Stitch, our combination of field expertise, certified technology, and rapid response ensures your operations stay safe, compliant, and productive — even under pressure.
