Pipeline construction involves various pre-heating activities, for example as part of welding activities or as part of the installation of field joint coating systems.
Pipelines today involve specialist pipe configurations and pre-heat can often form a critical part of the pipeline construction. Traditional gas flame and resistance heating systems can be slow, with a wide temperature variance through the circumference of the field joint area.
CRC-Evans offers pipe pre-heat solutions, for a range of pipe parameters:
- Induction coils with diesel generators
- Induction coils with rotary converters
- Induction coils with inverters
- Weld pre-heat coils (end coils or inter-pass coils) with generators
- Tailored solutions for combined pre-heat and coating machines (RAPTOR™)
Induction Heat Benefits
- No gases used (HSE)
- Optimum cycle times
- Controlled heat profiles
- Accurate, uniform heating over a controlled bandwidth
- No contamination to pipe substrate
Induction Coils with Diesel Generators or Rotary Converters
Induction coils are used widely within the pipeline industry to pre-heat the pipe substrate.
CRC-Evans offers a variety of induction coils to suit a wide range of pipeline diameters and temperature requirements.
Induction coils are powered by either diesel or rotary converter generators (90 Kva-200 Kva). High-powdered inverters are also available, offering improved cycle times for pre-heating heavy-wall large-diameter field joints.
Weld Pre-Heat Coils or Inter-Pass Coils and Post-Heat-Treatment Coils
Prior to welding activities, pipe ends are pre-heated (typically 110°C-160°C). The use of induction end coils provide uniform, controlled heat.
CRC-Evans provides induction end coils and inter-pass coils, which are powered by compatible generators or inverters, of varying power ratings. Induction heat end coils or inter-pass coils are designed specifically to pipeline parameters (diameter and cutback) and to meet cycle-time requirements. The equipment is lightweight and simple to operate.
Combined Pre-Heat and Coating Equipment
Combined pre-heat and coating machines are available, which offer the benefit of both the pre-heat and coating installation being carried out within the same machine and at the same station in the firing line.