APPARATUS FOR USE IN CRACK DETECTION

Apparatus for use in crack detection

Magnetic particle crack detection inspection of offshore structures or pipelines is conducted by manual manipulation single handedly by a diver of an electromagnet having legs 22, 26, 28; 24, 30, 32 protruding from a housing 10. The electromagnet legs engage the member under test and impose a magnetic field on the member. Magnetic ink is dispersed from nozzles beneath the section 34 upon depression of a push button 43, which controls a valve through which ink passes under pressure from an underwater supply connected to the housing at 42. Ultra-violet lamps in the section 34 shine through window 36 to cause the ink particles in the cracks to fluoresce. Electrical connections to the electromagnet coil in the section 12 are made at 14, 16 and to the lamps at 44. The section 12 forms a handle enabling the button 43 to be operated by a thumb. <IMAGE>

TESTING EARTH FAULTS

FOOT SPEED CONTROLLER FOR ELECTRIC MOTORS