Overview:
The ProHeat HF Induction Pipe Preheating System is a
state-of-the-art, high-frequency induction heating solution
designed specifically for the preheating and interpass temperature
control of girth welds on long-distance pipelines. It provides
fast, uniform, and precisely controlled heating circumferentially
around the pipe, ensuring optimal weld quality by meeting critical
preheat temperature requirements as specified by welding procedure
specifications (WPS). This non-contact system is ideal for onshore
and offshore pipeline construction and maintenance.
Key Features: Non-Contact Heating: Induction coils do not touch the pipe surface, eliminating
risks of contamination, mechanical damage, or hot spots from poor
contact. Rapid Heating: Achieves target preheat temperatures significantly faster
than traditional methods, boosting productivity on the
right-of-way. Exceptional Uniformity: Delivers consistent heat distribution uniformly around the
entire pipe circumference, crucial for preventing cracking and
ensuring sound weld integrity. Precise Digital Control: Advanced microprocessor-controlled power supply allows for
precise temperature setting, ramping, and holding with real-time
feedback from thermocouples. High Efficiency & Energy Savings: Concentrates electromagnetic energy directly onto the pipe
material, minimizing heat loss to the environment. Portable & Rugged: Modular design with weatherproof components suitable for
harsh construction site conditions.
Technical Parameters: Heating Technology: High-Frequency (HF) Electromagnetic Induction. Typical Frequency Range: 10 - 50 kHz. Power Output Range: 50 kW to 250 kW (system dependent). Pipe Diameter Range: 6" to 60" (150 mm to 1500 mm) and larger with different
coils. Temperature Range: Ambient to 400°C (750°F) and beyond, suitable for preheat and
Post Weld Heat Treatment (PWHT) stress relieving. Control System: Digital controller with touchscreen, data logging, and
multiple programmable recipes. Supports thermocouple (K-type)
feedback. Cooling: Integrated closed-loop water cooling system for the induction
coils and power unit. Mobility: Mounted on a skid or trailer for easy site movement.
Performance: Reduces preheating time by up to 70% compared to resistance heating
methods. Maintains interpass temperature within ±10°C of the set point. Improves weld quality and reduces hydrogen-induced cracking (HIC)
risk. Environmentally friendly, with no open flames or combustion gases.
Primary Applications: Mandatory preheating of carbon steel, low-alloy steel, and
high-strength pipeline girth welds (e.g., X70, X80 grade). Interpass temperature maintenance during welding. Localized Post Weld Heat Treatment (PWHT) for stress relief. Heating for in-service weld repairs (hot tap and line stop
operations).
|
