PT Hendon Mandiri Energi provides complete flange management services including bolt tightening and tensioning, flange spreading, leak sealing, and controlled bolting for critical plant and pipeline systems. Flange connections are among the most common sources of leaks in industrial facilities, and most of those leaks trace back to improper bolting. Our job is to eliminate that risk.
A flange joint is only as good as the load applied to its bolts. Too little load and the gasket cannot seal. Too much load, or uneven load, and the gasket crushes or the flange distorts. Controlled bolting applies the correct, uniform load to every bolt, giving the joint a reliable seal that holds under operating conditions.
Bolt Tightening with Hydraulic Torque Wrenches
Hydraulic torque wrenches apply a precisely controlled turning force to each nut. Our technicians calculate the target torque from the bolt size, material, lubrication, and gasket type, then tighten each bolt in the correct sequence and in multiple passes to distribute the load evenly across the joint.
Torque wrenches are ideal for most flange connections, from small instrument lines to large diameter piping. We use calibrated tools with certificates, and we record the final torque for every bolt in our reports.
Bolt Tensioning for Critical Connections
For the most critical connections, such as subsea risers, high-pressure gas lines, and large diameter flanges, bolt tensioning is the preferred method. Tensioners stretch the bolt hydraulically before the nut is tightened, so the final load is accurate and uniform without the friction losses that affect torque methods.
Bolt tensioning delivers higher accuracy and better repeatability, which is why it is specified for the most demanding services. Our teams have performed subsea bolt tensioning for major offshore operators, working from platforms and vessels under challenging conditions.
Flange Spreading and Gasket Replacement
When a flange must be opened for inspection or gasket replacement, flange spreaders separate the faces safely and evenly without damaging the sealing surfaces. We use hydraulic flange spreaders that control the opening and prevent accidental spring-back.
Once the joint is open, we inspect the flange faces, measure the gap, and prepare the surfaces for a new gasket. Proper gasket selection, installation, and alignment are as important as the bolting itself. Our technicians follow procedures that ensure the joint is reassembled correctly.
Online Leak Sealing
Leaks on pressurized flange connections do not always require a shutdown. Using online leak sealing techniques, we inject a sealing compound into the joint while the line remains under pressure, stopping the leak and restoring the integrity of the connection.
Online leak sealing is a specialised service that combines careful preparation, specialised injection equipment, and a thorough understanding of the joint and the fluid. Our teams assess each leak, select the appropriate compound, and execute the seal safely, allowing operators to defer repairs to a planned shutdown.
Controlled Bolting for Every Joint
Beyond individual services, we offer complete controlled bolting programs for plants undergoing maintenance or turnaround. Our teams work through flange lists, verify joint data, prepare bolt load calculations, and execute the bolting with documented results for every joint.
For critical services, we provide joint integrity management that tracks the history of each connection: when it was last opened, how it was bolted, and what condition it was in. This data helps operators plan maintenance and prevent failures before they occur.
Experience Across the Industry
Our flange management teams have worked for major oil and gas operators, refineries, petrochemical plants, and power stations. We have performed subsea and topside bolting, managed flange spreads on large diameter lines, and sealed leaks on live systems in remote and offshore locations.
Every project reinforces the same lesson: preparation and procedure matter more than tools. Our technicians are trained, our tools are calibrated, and our procedures are documented. That combination is what makes a flange joint reliable.
Protect Your Critical Connections
Contact our flange management specialists for your critical connections. Whether you need planned bolting for a turnaround, urgent leak sealing, or a complete joint integrity program, PT Hendon Mandiri Energi delivers accurate, documented, and safe results. Request a consultation today.
