Hot Bolting
Hot Bolting is a safe, accurate method of replacing worn out or corroded studs and nuts, while eliminating the need for Operations shut down. Powermaster offers safe, online bolt renewal or hot bolting services on ASME flanges to ensure continues safe working of your plant. These services are performed without any damage, leakages or interruptions in daily production. Special customised flange and joints too are attended by our specialised engineering team.
- All ASME, API, NORSOK flanges
- All sizes
- All pressure ratings
- All services, subjected to a risk assessment
- Design temperature between -101ºC (-150ºF) and 250ºC (480ºF)
Why Powermaster?
Experience
Powermaster hot-bolting services are accompanied by our highly experienced team of technicians. Our tools and procedures are designed to provide engineered solutions to our customers and maintain integrity of their assets.
Safety
Our hot bolting solution is designed to be simple but safe – the philosophy behind the design is to minimize the possibility of disturbing the gasket. Fitting and pre-loading Powermaster’s clamp is simple; it does not require any pneumatics or hydraulics for engagement with the flange. The lightweight and compact design fits almost all flange space restrictions, and because of the robustness enables speedy bolt replacement. The patented design of our hot bolt clamp design can be used on both non-hydrocarbon and hydrocarbon systems subject to satisfactory risk assessment.
Robust, yet simple design
The clamp, designed in accordance with ASME, consists of segments that are bolted around the flange, using backstops to prevent the clamp pre-load from being transferred directly to the flange and gasket. Each clamp is pressure tested to 1.5 times the most stringent design operating pressure, which permits temporary installation.
Clamps for 4-bolted flanges are designed to enable the use of a nut splitter and approved cold bolt removal tools and techniques. Clamps for larger flanges with more than 4 bolts have an enclosed design with space for use of a hydraulic socket wrench, spanner and twist socket.
Safe hot bolting on old flange connections mitigates these concerns:
- Unknown remaining bolt tension after a long time in operation.
- Unknown conditions of the bolts.
- Unknown conditions of the gasket.
- Unknown how the gasket will act under increased or decreased load.
- Failure of bolts during hot bolting operation on adjacent bolt.
- Unknown external loading.
- Unknown how much force is needed to remove old rusted bolts.
- Changes in operating parameters like flow, temperature, or pressure.
- Occurrence of unpredictable situations which could cause personnel to leave workplace.
Others
- For replacement of Bolts on in pressure flanges.
- Can be left as additional support on joints that else will force for shutdown.
- Available for all standard flange Joints.
- Safe and economical.