IWA Publishing

Table 4

Criteria scales (I_q/P/D)

I_q	P	D	I_q	P (%)	D
Very low damage to pipes and none to the environment	Impossible	Very easy to detect the defect or the cause of defect	1	1	1
Low damage to pipes and no damage to the environment	Possible	Easy to detect the defect by investigation	2	25	2
Moderate damage to pipes and possible damage to the environment	Probable	Detectability is validated manually	3	50	3
Critical damage to pipes and moderate to the environment	Likely	Detection not validated (manual or automatic)	4	75	4
Catastrophic damage to pipes and serious damage to the environment	Very probable	It is almost impossible to detect the defect or the cause of the defect	5	99	5

I_q	P	D	I_q	P (%)	D
Very low damage to pipes and none to the environment	Impossible	Very easy to detect the defect or the cause of defect	1	1	1
Low damage to pipes and no damage to the environment	Possible	Easy to detect the defect by investigation	2	25	2
Moderate damage to pipes and possible damage to the environment	Probable	Detectability is validated manually	3	50	3
Critical damage to pipes and moderate to the environment	Likely	Detection not validated (manual or automatic)	4	75	4
Catastrophic damage to pipes and serious damage to the environment	Very probable	It is almost impossible to detect the defect or the cause of the defect	5	99	5