Patent ID: 9512737
Filing Date: 2016-12-06
CPC Classification: F01D,Y10T

Claim Text:
1. A gas turbine inspection port plug apparatus for insertion into a mating gas turbine inspection port of a turbine inspection port system that is coupled to a gas turbine engine casing, comprising: an elongated plug shaft, constructed of a material having a first magnetic permeability, for insertion into a mating gas turbine inspection port; a plug seating surface on a distal end of the plug shaft, for sealing engagement with a mating inspection opening seat defined by a gas turbine engine casing upon insertion of the plug shaft into a gas turbine inspection port; a plug cap on a proximal end of the plug shaft; and a magnetically attractive pole piece constructed of material having a second magnetic permeability greater than the first magnetic permeability, oriented in proximity to the plug shaft proximal end, for concentration or redirection of an attractive magnetic field circuit generated by an inspection port plug service tool during plug insertion or retrieval.