Online Leak Sealing vs Shutdown Repair: A Cost Comparison
A small flange leak can cost lakhs in lost production if you shut down. Online leak sealing lets you fix it without stopping the plant. Here's the real math.
Every plant engineer has faced this dilemma. A flange on a high-pressure steam line starts weeping. It's not a catastrophic leak, but it's steady, and the operations team is nervous. Do you shut down to fix it, or do you seal it online?
We run the numbers on behalf of our clients every month. The answer is almost always online sealing — but let's walk through why.
The Cost of Shutting Down
A typical shutdown to replace one flange gasket on a live steam line involves: isolation and depressurization (6–12 hours), cooling (8–24 hours depending on line size), gasket replacement (2–4 hours), re-commissioning and warm-up (6–12 hours).
For a 150 MW power plant running at ₹4/kWh, that's 30–50 hours of lost production worth ₹1.8–3 crore. For a process plant, the number can be much higher due to batch losses and restart chemistry issues.
The Cost of Online Sealing
Online leak sealing typically involves fabricating a custom clamp around the leaking joint and injecting a compatible sealant under pressure until the leak stops. The whole job, including mobilization, is usually done in 4–8 hours with zero production loss.
Direct costs for a typical flange seal range from ₹25,000 to ₹2,00,000 depending on size, pressure, and service fluid. That's 1–2% of what a shutdown costs.
When Online Sealing Makes Sense
Online sealing is the right call for most flange leaks, valve stem leaks, and pinhole leaks on pipes up to a certain diameter. It works across a wide temperature and pressure range — we have sealed joints at 540°C and 180 bar.
It buys you time until the next planned turnaround, when you can do a permanent repair with the line depressurized.
When a Shutdown is Still Required
Very large bore leaks, cracks in pressure-containing components, and leaks on critical safety systems usually require a shutdown. The online sealing engineer will always assess the joint before committing — safety is never traded for uptime.
The Bottom Line
For the vast majority of plant leaks we see, online sealing saves 90%+ of the total cost compared to a shutdown repair. If you have a leak right now, call us — we can often mobilize within 24 hours and have you back to full containment before your next shift change.
