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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. |
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| Induction coil |
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| One-touch-operation coil |
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Coil application on furnace
header tube welds |
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Features |
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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 |
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- 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
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Applications |
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- Piping construction in general, furnace tubes
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Experience |
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| Plant/Piping |
Materials |
No. of Joints |
| Amine Plant |
Carbon Steel |
200 |
| Gas Plant |
Carbon Steel |
>800 |
| CCR Plat. |
9Cr-1Mo + Incoloy 800 |
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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