000			02124nmc a2200217 4500
005			20260520005825.0
008			260224s xxu
082			_aCD I249 1 0013788
245	0	0	_aThe introduction report of damage monitoring system for trunkline
270			_a12/09/06 ; 22/07/2003
300			_a4 p.
500			_aDisponible en CD en formato PDF
520			_aTranscripción del abstract original del autor: High-pressure gas pipeline coating can be damaged by various causes. A damage monitoring system automatically detects and locates such damage and immediately calls a control center. For pipelines consisting of steel pipe coated with polyethylene or similar highinsulation material and cathodically protected using a single external power supply unit, coating damage caused by interference from machinery operated for earthworks of other companies can be detected by changes in the cathodic protection current. Osaka Gas has been using this system in some of its gas pipelines as one measure for monitoring interference caused by earthworks of other companies. However, in areas crowded with stray currents, such as current leaking from railway tracks and cathodic protection current for other underground structures, the system has great difficulty detecting coating damage due to electric noise disturbance. To cope with this problem, we studied the possibility of using an alternate current as a signal current exclusively for damage detection, and have successfully developed a new damage monitoring system that features high noise immunity and greatly improved detection accuracy. The work of introducing this new system to the Kinki Western Trunk Line II (4 sections, total length of 158 km) and the Kinki Western Trunk Line III (total length of 73 km) commenced in 1998 and was completed in May 2002.
773			_g
942			_cCONGTP
100	1		_aMiura, Satoru _922398
110	2		_aInternational Gas Union, IGU _913105
111	2		_aWorld Gas Conference (22nd. : 2003 jun 1-5 : Tokyo) _922029
710	2		_aInternational Gas Union, IGU _913105
999			_c149755 _d149755