Inspection Results

Various defects were observed during the CCTV visualization inspection. Condition assessment of the results found that a total of 537 out of 2,451 total defects (22%) were considered to be minor and given a condition grade of 1. Subsequently, these were omitted from the pipe segment ratings and the subsequent tables and figures. Common defects observed during the CCTV inspection included pinholes in the liner, blisters in the liner, detached weld strips, and holes in the liner. Several of these defects are illustrated in Figure 2. A breakdown of the Grade 2 through 5 defects is presented in Table 2.

Figure 2. Detached liner

Figure 3. Detached weldstrip

Figure 4. Blister in liner

Table 2. Breakdown of Phoenix defects

Defect Descriptions

Defect

Code

Total # Found

% of Defects

Pinhole in Liner

LFPH

1038

54.2

Blister in Liner

LFB

278

14.5

Weld Strip Detached

LFWS

169

8.8

Hole in Liner

LFHR

127

6.6

LFHL

99

5.2

LFHC

31

1.6

Detached Liner

LFD

72

3.7

Wrinkled Liner

LFW

54

2.8

Grease Deposits

DAGS

23

1.2

Settled Deposits

DS

12

0.6

Obstructions

OBZ

5

0.3

Deposits, Attached

DAE

2

0.1

Visible

Reinforcement

SRVC

1

0.1

Object Protruding

OBI

1

0.1

Construction Debris

OBN

1

0.1

Defective Tap

TFD

1

0.1

Total

1914

100%