Piping installation involves tens of thousands of PWHT points in a large plant, and dozens to hundreds of points even in a small maintenance project-a fact that means the impact of PWHT on a piping construction schedule can be considerable. This highly efficient PWHT technology using induction heating is a time saving technique that enables a far higher heat-up rate (1,000 degrees C/Hr) than conventional PWHT with an electric resistance heating element.

Features

Rate of Heat-up and Efficiencies

Heat-up Method	Rate (degree C/hr)	Efficiencies
Conventional electric resistance heating	200	1 step/night
Induction heating	More than 1,000	2 steps/night

• Wide and uniform heated zone
  Wide enough to cover ASME-specified uniform heated zone at PWHT
• Highly accurate temperature control
  Inverter-controlled power source enables accurate heat-up/hold/cool-down steps
• High level of safety
  Differ from annealing with an electric resistance heating element, a non-heat-generating induction coil assures a high level of safety
• Easy installation
  One-touch-operation coil (a built-in coil sheet to be placed around piping) enables simple fixing and removal as compared with induction coil winding around piping

Applications

• Piping construction in general, furnace tubes

Experience

Plant/Piping	Materials	No. of Joints
Amine Plant	Carbon Steel	200
Gas Plant	Carbon Steel	800
CCR Plat.	9Cr-1Mo+Incoloy800	250
HDS/CCR	Carbon Steel,9Cr-1Mo	800
CCR Plat.	1-1/4Cr-1/2Mo	50
CCR Plat.	9Cr-1Mo	500
Gas Plant	Carbon Steel	160
Gas Plant	Carbon Steel	850

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