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In Table 13, we can see that every number is smaller than 1, so when we calculate the weight, we can skip Step 1 in Section 5.1, with Steps 2–4 in Section 5.1 we calculate the information entropy E, the results are shown in Table 14 (we only put T value to calculate).

Table 14

E-value of submarine pipeline

First-grade	Weight	Second-grade	Weight	Third-grade	Weight
Pipeline corrosion	0.1937	External corrosion	0.5538	Environmental corrosion	0.2672
				Cathodic protection	0.0088
				Pipeline property	0.6204
				Stress corrosion	0.0616
				Number of years	0.0420
		Internal corrosion	0.0226	Fluid properties	0.3397
		Internal corrosion	0.0226	Internal corrosion protection	0.6603
		Age and corrosion detection	0.4236
Fatigue aging	0.0696	Pressure safety factor	0.0503
		Pipe diameter	0.1290
		Pipeline life	0.7362
		Wave current scour	0.0371
		Mitigation measures	0.0474
Nature break forces	0.1070	Soil movement	0.0914
Nature break forces	0.1070	Extreme weather	0.9086
Third-party damage	0.1364	Overburden condition	0.0114
		Water activity level	0.3124
		Preventive measures against damage	0.1073
		Identification of the sea area around the pipeline	0.5689
Misoperation	0.4932	Safety check	0.3554
		Technological procedure	0.2001
		Safety record	0.2071
		Training situation	0.2001
		Comprehensive quality of personnel	0.0373	Business capability	0.1734
		Comprehensive quality of personnel	0.0373	Sense of responsibility	0.8266

First-grade	Weight	Second-grade	Weight	Third-grade	Weight
Pipeline corrosion	0.1937	External corrosion	0.5538	Environmental corrosion	0.2672
				Cathodic protection	0.0088
				Pipeline property	0.6204
				Stress corrosion	0.0616
				Number of years	0.0420
		Internal corrosion	0.0226	Fluid properties	0.3397
		Internal corrosion	0.0226	Internal corrosion protection	0.6603
		Age and corrosion detection	0.4236
Fatigue aging	0.0696	Pressure safety factor	0.0503
		Pipe diameter	0.1290
		Pipeline life	0.7362
		Wave current scour	0.0371
		Mitigation measures	0.0474
Nature break forces	0.1070	Soil movement	0.0914
Nature break forces	0.1070	Extreme weather	0.9086
Third-party damage	0.1364	Overburden condition	0.0114
		Water activity level	0.3124
		Preventive measures against damage	0.1073
		Identification of the sea area around the pipeline	0.5689
Misoperation	0.4932	Safety check	0.3554
		Technological procedure	0.2001
		Safety record	0.2071
		Training situation	0.2001
		Comprehensive quality of personnel	0.0373	Business capability	0.1734
		Comprehensive quality of personnel	0.0373	Sense of responsibility	0.8266

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