TOFD Inspection on Turbine Spiral Casing in Ludila Hydropower Station

Introduction to Turbine Spiral Casing

On-site pictures of turbine spiral casing

The turbine spiral casing in Ludila hydropower station consists of thirty-four C-shaped sections, one extension part, access door and other parts.

Parameters of turbine spiral casing Maximum diameter of section: Φ9000mm Maximum thickness of steel plate: 47mm Maximum overall dimensions: 20300×12730×9000(mm) Weight: 387 tons

Structural Simulation of Turbine Spiral Casing

Welding in Turbine Spiral Casing

System Introduction

SUPOR	1-Ch TOFD Crawler

Ultrasonic Flaw Detector SUPOR (up to 6-channel TOFD)

SUPOR Inspects the Turbine Spiral Casing

Fig 1. Both Sides of Welding are with Unequal Thickness

Fig 2. Butterfly Edge Welding