Gas Safety Inspection Report and SOW (Underground) -2 (English).pdf

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번호 KGS 2019 -

2019 Katusha

Safety Diagnosis Report

[Buried Gas Pipe]

2019 Katusha

Safety Diagnosis Report

[Buried Gas Pipe]

Pipeline Diagnosis Division of Korea Gas Safety Corporation

Table of Contents

Chapter 1. Beginning ·························································································· 1

1. Summary of safety diagnosis result ···················································· 2

2. List of participating technical staff ·············································· 3

3. Location map of pipe ················································································ 4

Chapter 2. Safety Diagnosis Overview ······················································ 7

1. Purpose of diagnosis ················································································ 8

2. Range and contents of diagnosis ·························································· 8

3. Status of equipment and equipment used ·········································· 11

4. Diagnosis performance schedule ···························································· 12

Chapter 3. Field Test and Survey·································································· 13

1. Field survey and analysis of test results of piping subject to diagnosis ···························· 14

Chapter 4. Comprehensive Evaluation··························································· 22

1. Comprehensive conclusion on diagnosis results ······························ 23

2. The improvement plan of problems derived from diagnosis results ···························································· 25

3. Other things that need ············································································ 26

Chapter 5. Supplement······························································································ 27

1. Diagnosis-related photos ·········································································· 28

2. Measurement and test result data ·························································· 29

Chapter 6. Attached picture table of contents ···································· 31

Chapter 1. Beginning

Safety Diagnosis Report for City Gas Piping

- 2 -

1. Summary of safety diagnosis result

1.1 Gas leakage status

○ As a result of the gas leakage test using the gas leakage complex gas detector, there was no gas leakage.

1.2 Diagnosis of coating defect in buried pipeline

○ As a result of detecting the coating damage using DCVG(Direct Current

Voltage Gradient) for 409m of the section of the three units under-diagnosis, one coating damage estimated portion detected in the two-unit (Camp Carroll has not PLP medium pressure pipeline. So could not be used DCVG)

○ The results of the CIPS (Close Interval Potential Survey) in the camp walker in the 209m and the Camp Henry in the 200m section of the diagnosis target section satisfy the overall corrosion protection potential (-0.85V / cse or less), but the interference section exists.

Therefore, continuous monitoring is required.

○ There is one coating damage estimation part in the diagnosis section. At

135m from the camp walker, the% IR value is 6.25%, and the surrounding potential value of the coating damage estimation point meets corrosion protection potential (-0.85V / cse or less), but continuous monitoring is required.

1.3 Corrosion protection potential measurement

○ As a result of checking the corrosion protection potential of the diagnostic target section at 15 points including Test Box, Valve, gas-fired facilities, and governer, the corrosion protection potential value satisfies the corrosion protection potential standard of -0.85v /

- 3 -cse or less. However, among the PLP valves, Camp Henry's S1654-V31 valve confirmed that the valve was made of PLP material and the piping was made of PE material by measuring the corrosion protection potential. (Check the Camp Henry corrosion protection potential measurement attachment.)

1.4 Corrosion protection potential propriety of test box

○ As a result of checking the installation and management status of seven of the T/B sites checked, the installation and management status of seven sites is satisfactory.

1.5 Linemark, etc. buried piping location sign

○ The proper installation, maintenance status, and matching of the installed location of the buried pipe, line mark and buried pipe sign using the distance meter, RD8000(Pipe Locator), and GPR(Ground

Penetrating Radar) are mostly maintained appropriately.

2. List of technical staff participating in diagnosis

Corporate name Department Position The person in charge

Field

Korea Gas

Safety

Corporation

Pipeline

Diagnosis

Division

Team leader

Younsang

Kong

Machine field

Electrical field

Deputy

General

Manager

Changhoon

Yeo

Field of chemical engineering

Electrical field

Deputy

Manager

Jeongkun

Yoo

Field of chemical engineering

Electrical field

- 4 -

3. Location map of pipe

Diagnostic target location map (Camp Carroll)

- 5 -

Diagnostic target location map(Camp Walker)

- 6 -

Diagnostic target location map(Camp Henry)

Chapter 2. Safety Diagnosis Overview

- 8 -

The purpose of the diagnosis is to check and remove potential hazards and causes of buried piping by checking documents, investigating on-site and measuring on-site. Therefore we check gas leakage, the propriety of electrical corrosion protection equipment, coating damage or not in the buried pipe, and accuracy of drawing to prevent gas accidents by suggesting safety management methods and securing the integrity of long-term service piping and prevent gas accidents.

1. Purpose of diagnosis

2. Range and contents of diagnosis

2.1. Machine field

2.1.1 Checking whether gas leakage or not

○ To check for gas leakage on valves and installed piping, check for gas leakage using the gas leakage detector.

2.1.2 Whether to damage on pipe coating

○ The selection of sections about Whether to damage on the pipe coating is selected to medium pressure PLP pipe section. Also, check the piping for coating damage using the coating damage detection device.

○ If damages on the pipe coating are detected, measure the electrical corrosion protection management status, size of the damage signal of pipe coating, and interference status.

- 9 -

2.1.3 Close interval potential survey (CIPS)

○ The selection of sections about close interval potential survey was selected to medium pressure PLP pipe section. Also, measure corrosion protection potential continuously at intervals of 1 to 5 m along the pipe.

2.2 Electrical field

2.2.1 Measure of corrosion protection potential

○ It is required to verify the proper management of the corrosion protection equipment, such as inspection of the rectifier and measurement of the corrosion protection potential.

2.2.2 Whether to proper manage for measurement terminal

○ The terminal for corrosion protection potential measurement for maintenance of electrical facilities shall be properly installed and maintained in accordance with KGS code GC202[Code for Cathodic Protection of

Gas Installations].

2.3. Other field

2.3.1 Whether to proper install linemark and buried pipe sign.

○ Check the proper installation and maintenance status about line mark and buried pipe sign according to KGS code KGS FS551[Code for Facilities, Technology, Inspection and Detailed Safety Diagnosis for Pipeline Outside the

Manufacturing Places and Supply Stations of General City Gas Business] 1.5 and 2.10 in the City Gas Business Act.

○ Check whether the buried pipe, line marks, and buried pipe sign locations are matched or not by using Pipe Locator.

- 10 -

2.3.2 Accuracy of drawing

○ To verify the accuracy of the drawings, check the location and depth of the piping using the Pipe Locator, if necessary.

- 11 -

3. Status of equipment and equipment used

No. Name of the equipment Unit Use

1 Laser Methane Gas Detector 1 Gas leakage test

2 Close Interval Potential Survey Detector 1 Close interval potential survey

Direct Current

Voltage Gradient

Analog 1 Detecting the buried piping coating damagedigital 1

GPS-Synchronous Current

Interrupter

Interrupt direct current of rectifiers at regular intervals

Remote Control Synchronous Type

Rectifier 1 Cathodic potential test

Large-diameter current measuring instrument 1 Insulation and current flow survey

Insulation Precision

Measuring Instrument 1 Insulation survey

8 Buried Pipe Location Detector 1 Detecting the buried pipe location

9 Buried Pipe Current Detector 1 measuring current amount of pipe and

Detecting buried pipe coating damage

10 Small Generator 1 Power supply required for diagnosis

Pipe Thickness

Measuring Instrument 1 Measuring pipe thickness

12 Pipe Coating Pinhole Detector 1 Detecting pipe coating pinhole

Coating Thickness Measuring

Detector 1 Measuring coating thickness

14 Pipe Stress Analyzer 1 Analyzing pipe stress

Multimeter Capable of

Recording Potential

Measurements

Measuring corrosion protection potential

Laser Distance Measuring

Detector 1 Measuring distance

Soil Specific Resistance

Measuring Instrument

Measuring soil specific resistance

Gas Leakage Complex Gas

Detector 1 Gas leakage detect and analyze

20 Depth Gage 1 Measuring depth of pipe corrosion

21 Ground Penetrating Radar 1 Soft ground diagnosis and detecting buried piping

- 12 -

4. Diagnosis performance schedule

4.1 Diagnosis period : 2019.6.10 ~ 2019.7.12

4.2 Major process

Checking the site of the pipe to be diagnosed

Contact Meeting

Diagnosis schedule consultation

Checking the pipe location and pipe drawing

Measuring protection potential and checking line mark and valve

Measuring protection potential of buried piping

Checking the maintenance status of the protection voltage measurement terminal

Checking line mark and valve status

Checking pipe location and measuring depth of pipe

Checking the pipe location by using pipe location detector

Checking accuracy of drawing

Checking piping coating damage

Conducting DCVG and CIPS

Severity determination of piping coating damage

Check interference status Select doubted of interference section based on protection potential measured value

Checking whether to leak gas

Gas leakage test by using gas leakage complex gas detector

Chapter 3. Field Test and Survey

- 14 -

1. Field survey and analysis of test results of piping subjected to diagnosis

1.1. Checking leakage gas

1.1.1 Outline

○ To check for leakage of gas on pipes and attached facility to safety diagnosis, inspect them according to the method provided by KGS CODE

FS551[Code for Facilities, Technology, Inspection and Detailed Safety Diagnosis for

Pipeline Outside the Manufacturing Places and Supply Stations of General City Gas

Business] 4.2.4 safety diagnosis and check the safety of the pipes and prevention of accidents caused by gas leakage.

1.1.2 Diagnosis method

○ For buried piping, use a portable MLD (Methane Leak Detector) to detect leakage.

○ If leakage is suspected or abnormally indicated on the measuring equipment, spray soapy water to reconfirm the leakage point.

1.1.3 Diagnosis result

○ Checking leakage gas

- As a result of the gas leakage test using the complex gas detector, no gas leakage.

1.2 Checking whether to damage of piping coating

1.2.1 Outline

○ To investigate corrosion of buried piping, check the integrity of the buried piping through DCVG(Direct Current Voltage Gradient) or

ACVG(Alternate Current Voltage Gradient) and CIPS(Close Interval

- 15 -

Potential Gradient).

1.2.2 Diagnosis method

○ Checking whether to damage of coating damage using the piping coating damage detector

○ If damaged parts of the pipe are found, measure the state of corrosion protection potential management, size of the damage signal on the coating, and interference.

1.2.3 Diagnosis result

○ Detection of the coating damage using DCVG (Direct Current Voltage

Gradient) for the 409m section of the Camp Walker and Camp Henry has resulted in the detection of one coating damage estimated portion

○ Based on the measurement of the estimated coating damage detected in Camp

Walker(135m), %IR is 6.25%, a potential difference of 0.824V/cse of pipes, -2.23V/cse of On potential, and -1.399V/cse of off potential meet the corrosion protection potential criteria. However, continuous monitoring is required as the coating damage exists and is judged to have an effect on interference.

- 16 -

○ Graph of CIPS and DCVG

< Graph of CIPS and DCVG in Camp Walker >

< Graph of CIPS and DCVG in Camp Henry>

- 17 -

○ The CIPS result show that the lowest difference corrosion protection potential of the Camp Walker is 0.488V/cse, and the lowest corrosion protection potential of the Camp Henry is -1.266V/cse, which satisfies the corrosion protection potential criteria(-0.85V/cse, 0.1V/cse on/off). However, from the point 200m from Camp Henry, it is assumed that it was measured to be affected by interference and that the piping was in contact with other facilities.

Therefore, continuous monitoring is required. If excavations are needed, we recommend 135m spot of Camp Walker and 200m spot of Camp Henry.

※ NACE‐SP0169 states that "unless special conditions are specified, the corrosion protection potential of steel piping shall be kept lower than -850 mV based on the copper sulfate," and that the corrosion protection standard of steel piping materials shall be as follows.

(1) Corrosion protection potential applied : ‐0.85 V/cse ("On"

Potential-IR Drop)

(2) polarized potential : ‐0.85 V/cse (Instant "Off" Potential, Polarized Potential)

(3) 100 mV Polarization

‐ NACE SP0169, "Control of External Corrosion on Underground or Submerged Metallic Piping Systems," NACE International, Houston, TX, 2013

1.3 Measuring Corrosion protection potential of pipe

1.3.1 Outline

○ Checking integrity of the buried pipe by measuring corrosion protection potential.

- 18 -

1.3.2 Diagnosis method

○ Measurement of corrosion protection potential is performed to verify the proper management of the corrosion protection facility.

○ Measurement of the corrosion protection potential of interference with other facilities is required for checking the interference status.

1.3.3 Diagnosis result

○ Result of checking the installation and management status of seven

Test Boxes in this diagnosis section, the measured corrosion protection potential values are satisfied (below - 0.85V/cse) and the installation and management status are good.

- 19 -

□ Corrosion protection potential measurement result

Num Location Measurement potential Note

1 S364 T/B -1.3069V/cse Camp Walker

2 S341 T/B -1.2747V/cse Camp Walker

3 S363 -1.1843V/cse Camp Walker

4 Pennslyvania Avenue T/B -1.2089V/cse Camp Walker

5 S400 T/B -1.2032V/cse Camp Walker

6 S452 T/B -1.2423V/cse Camp Walker

7 V410-1 -1.1275V/cse Camp Walker

8 S1712 V4 -1.6553V/cse Camp Henry

9 S1712 V3 -1.6225V/cse Camp Henry

10 S1712 V5 -1.2706V/cse Camp Henry

11 S1805 T/B -1.2625V/cse Camp Henry

12 S1712 T/B -1.6763V/cse Camp Henry

1.4. Accuracy of drawings

1.4.1 Outline

○ Checking the accuracy of the drawings, the location, and depth of the piping were checked using Pipe Locator and GPR, and the presence, location, and maintenance status of the valves were checked.

1.4.2 Diagnosis result

○ It was possible to check the location of the piping, number of valves, and location of the pipes, but it was not possible to check the loss of valves due to other construction work, the presence of the handles and rods of the valves, and the materials of the pipes.

- 20 -

- In the case of Camp Carroll, the part where it is challenging to locate the pipe by looking at the drawing was accurately explored through GPR. In addition, a valve that existed on the drawing but did not exist in practice was found to have been lost. And we found three valves that were not in the drawing but were present, and two of them are hydraulic valves, which could not be checked because other equipment needed to be used to open them. There were also valves with no handle and no rod in it.

- In the case of Camp Walker, there were a number of valves without handles and rods, and it was determined that V13 did not really exist on the drawing either. Also, we found four valves that are not in the drawing but exist. In addition, the medium-pressure valves and the low-pressure valves are mixed, so it is hard to distinguish. Therefore we distinguished them.

- In the case of Camp Henry, there were valve handles and rodless valves, and two valves were found which were not shown in the drawings.

1.5.Appropriateness of management of measurement test boxes of corrosion protection potential

1.5.1 Outline

○ The potential measurement Terminal Box(T/B) for maintenance of electrical corrosion protection facilities was checked for proper installation and maintenance in accordance with KGS code GC202[Code for

Cathodic Protection of Gas Installations].

1.5.2 Diagnosis result

○ As a result of checking the installation and maintenance status of seven

- 21 -numbers of T/B and five numbers of PLP valves, the installation, and maintenance status of 12 locations is good, but it is not shown in the drawing and recommended to be shown on the drawing.

1.6 Line mark, Buried Gas Line Sign

1.6.1 Outline

○ Line marks and signs were checked for proper installation and maintenance according to KGS Code FS551[Code for Facilities, Technology, Inspection and Detailed Safety Diagnosis for Pipeline Outside the Manufacturing Places and Supply Stations of General City Gas Business], and the location of the buried piping, line mark, and signboard installation is checked using

Pipe Locator.

1.6.2 Diagnosis result

○ As a result of checking the line marks of buried piping, line marks, signboard of proper installation, maintenance status, matching of installation location by using Walking Meter, Pipe Locator, we found damage of line marks, line mark not installed, line mark installation error.

Chapter 4. Comprehensive Evaluation

- 23 -

1. Comprehensive conclusion on diagnosis results

□ Detection of the coating damage using DCVG(Direct Current Voltage

Gradient) for a 409m section of the diagnosed section has resulted in one coating damage estimate detected in all two sections.

□ The %IR of the damaged area of the Camp Walker at 135 m was 6.25%, but the on/off potential difference value of the pipe was 0.824 V / cse.

The potential value is normal, but continuous monitoring is required.

It is also recommended to excavate this point if excavation is required.

□ Though coating damage estimated portion is not, 200m point of Camp

Henry is occurred interference by contact with other facilities. So continuous monitoring is required and recommend excavation if it is necessary.

□ The CIPS(Close Interval Potential Survey) result show that the lowest on/off difference of corrosion protection potential of the Camp Walker is

0.488V/cse, and the lowest corrosion protection potential of the Camp

Henry is -1.266V/cse, which satisfies the protection potential criteria(-0.85V/cse, 0.1V/cse on/off).

□ The corrosion protection potential of the seven T/B and five PLP valves is satisfied with the corrosion protection criteria (-0.85 mv/cse).

- 24 -

□ Of the total 128 valves in the diagnosis area, there were 48 handleless, rodless, lidless valves one exposure valve, one low depth valve, and two valves that could not open. Therefore, it is recommended that valves without handles, rods, and lids should replenish scarce facilities, the exposed valves buried, and low-depth valves should be excavation if necessary to deepen the depth. Also, for valves that cannot be opened, it is recommended to prepare with openable equipment.(Body Reference, Attachment Verification)

□ In the case of line marks, there were sections without line marks, sections with direction errors, sections with damage, and there were few line marks around the gas-fired facilities. Therefore, line mark installation is recommended for maintenance of pipe.

- 25 -

Category relevant regulations Content Improvement plan

Whether to presence parts in valves

KGS

FS551

○Camp Carroll, Camp Walker and Camp Henry had not 48 valve parts out of a total of 128 valves

○ Recommended to fill out scarce parts for gas safety management.

Line marks not installed and error

KGS

FS551

○The result of checking the line marks in Camp

Carroll, Camp Walker, Camp Henry, we found several not installed, direction error, damaged

Line marks

○Reinforcement and modification of the line mark is recommended for location of piping and safety management of gas.

Drawing

Management

KGS

FS551

○Camp Walker and Camp Henry were found to have no drawings. In addition, the drawing of the camp carroll was not modified for newly installed and removed valves.

○It is recommended that gas representatives be deployed to manage the drawings and ensure safety through continuous updates.

2. The improvement plan of problems derived from diagnosis results.

(See Attachment)

- 26 -

3. Other things that need

○ Increase the integrity of pipes by assigning work a personnel to gas pipes

- It is necessary to encourage an employee to participate in training programs of domestic and foreign personnel, and to manage drawings, valves, and line marks to secure the integrity of pipes by assigning one personnel to solve problems.

Chapter 5. Supplement

- 28 -

1. Diagnosis-related photos

1.1 Field survey photography

< DCVG(Direct Current Voltage Gradient > < Detecting piping location(Piping Locator) >

1.2 Coating damage estimated portion location photo

○ Camp Walker 135m spot

D-1 Camp Walker 135m spot protection potential difference:0.488 V/cse

%IR: 6.25%

Note: Continuous monitering is required

- 29 -

2. Measurement and test result data

2.1 Ground Penetrating Radar(GPR) diagnostics

2.2.1 Outline

○ For ground subsidence areas, use GPR to probe underground joints, ground subsidence, underground burials, etc. around piping.

* GPR(Ground Penetrating Radar) : Underground exploration equipment, equipment that penetrates electromagnetic waves in the ground and analyzes reflected electromagnetic waves to probe underground objects, cavities and subsidence.

- 30 -

2.2.2 Diagnosis result

○ Carried out the diagnosis of the soft ground using GPR and the location of the buried pipe around Camp Carol S121.

GPR detection

As a result of the GPR measurement, it is estimated that there are two pipelines with gas piping (PE), and a depth of 1.2 m is formed (S 121)

- 31 -

Gas piping estimation part GPR measurement result confirmed that there is no piping.

- 32 -

6. Attached photo table of contents

1. Valve indication photos in Camp Carroll ·············································· 33

2. Valve gas leak test photograph in Camp Carroll ································ 38

3. Valve operation inspection photograph in Camp Carroll ·················· 48

4. Buried valve detection photo in Camp Carroll ···································· 58

5. Governer potential measurement photos in Camp Carroll ·················· 59

6. Line-mark indication photos in Camp Carroll ······································ 60

7. GPR photos in Camp Carroll ········································································ 70

8. Valve indication photos in Camp Walker ·················································· 71

9. Valve gas leak test photograph in Camp Walker ·································· 76

10. Valve operation inspection photograph in Camp Walker ···················· 85

11. Line-mark indication photos in Camp Walker ·········································· 94

12. Corrosion protection potential measurement photo in Camp Walker 105

13. Buried gas pipe detection Photos in Camp Walker ······························ 107

14. DCVG photos in Camp Walker ········································································ 108

15. CIPS photos in Camp Walker ········································································ 109

16. Valve indication photos in Camp Henry ·················································· 110

17. Valve gas leak test photograph in Camp Henry ···································· 116

18. Valve operation inspection photograph in Henry ································ 122

19. Line-mark indication photos in Camp Henry ·········································· 128

20. Corrosion protection potential measurement photo in Camp Henry 130

21. DCVG Photos in Camp Henry ·········································································· 131

22. CIPS Photos in Camp Henry ·········································································· 132

23. GTI criteria chart ························································································ 133

- 33 -

1. Valve indication photos in Camp Carroll

V137-1 : Defective rod length V267-5 : Rod is not existed

V137-2 : Defective rod length

V301-4 : Defective rod length, Valve Sign is not existed

- 34 -

V250-6: 20cm inundation V256-10 : defective rod length

Valve is not existed

V272-11 : 90cm inundation Rod and handle is not existed, Pipe is exposed V304-16 : Valve is not existed

V307-17 : Rod and handle is not existed V304-18 : 30cm inundation

- 35 -

V323-23 : Rod and handle is not existed V615-26 : Rod and handle is not existed

V561-29: Valve is not existed V521-32 : Rod and handle is not existed

V944-36 : Rod and handle is not existed V906-38 : Defective rod length

- 36 -

V711-39 : Rod and handle is not existed V914-40 : Valve is not existed

Valve is not existed

V911-42 : Valve is not existed V911-43 : Rod and handle is not existed

Valve is not existed

V905-44 : Defective rod length V905-45 : Valve is not existed

- 37 -

V119-46 : Rod and handle is not existed V108-47 : Rod and handle is not existed

ADD-1

S-607

ADD-2

S-684

ADD-3

S-606

- 38 -

2. Valve gas leak test photograph in Camp Carroll

V137-1 V137-2

V203-3 V301-4

V267-5 V250-6

- 39 -

V236-7 V252-8

V240-9 V256-10

V272-11 V12

- 40 -

V402-13 V263-14

Valve is not existed

V303-15 V304-16

V307-17 V304-18

- 41 -

V318-19 V356-20

V848-21 V320-22

V323-23 V356-24

- 42 -

V676-25 V615-26

V657-27 V561-28

V561-29 V563-30

- 43 -

V521-31 V521-32

V521-33 V510A-34

V326-35 V944-36

- 44 -

V925-37 V906-38

Valve is not existed

V711-39 V914-40

Valve is not existed Valve is not existed

V914-41 V911-42

- 45 -

V911-43 V905-44

Valve is not existed

V905-45 V119-46

V108-47 V163-48

- 46 -

V137-49 V110-50

Valve is not existed

V180-51 V52-X

Photo is not existed Can not be open

ADD-1 S-607 ADD-2 S-684

- 47 -

Can not be open

ADD-3 S-606

- 48 -

3. Valve operation inspection photograph in Camp Carroll

V137-1 V137-2

V203-3 V301-4

V267-5 V250-6

- 49 -

V236-7 V252-8

V240-9 V256-10

V272-11 12 - X

- 50 -

V402-13 V263-14

Valve is not existed

V303-15 V304-16

V307-17 V304-18

- 51 -

V318-19 V356-20

V848-21 V320-22

V323-23 V356-24

- 52 -

V676-25 V615-26

V657-27 V561-28

V561-29 V563-30

- 53 -

V521-31 V521-32

V521-33 V510A-34

V326-35 V944-36

- 54 -

V925-37 V906-38

Valve is not existed

V711-39 V914-40

Valve is not existed Valve is not existed

V914-41 V911-42

- 55 -

V911-43 V905-44

Valve is not existed

V905-45 V119-46

V108-47 V163-48

- 56 -

V137-49 V110-50

Valve is not existed

V180-51 V52-X

Photo is not existed Can not be open

ADD-1 S-607 ADD-2 S-684

- 57 -

Can not be open

ADD-3 S-606

- 58 -

4. Buried valve detection photo in Camp Carroll

V45 : Valves detected with metal detector but not found

V40, V42 : Valves detected with metal detector but not found

V41 : Valves detected with metal detector but not found

- 59 -

5. Governer potential measurement photos in Camp Carroll

Governer Potential measurement( PLP)

Potential value : -1.4522V/cse

Governer Potential measurement (PE)

Potential value : -0.2536V/cse

- 60 -

6. Line-mark indication photos in Camp Carroll

Governer : Line-mark damage

S-162 : Line-mark damage

S-143 : Line-mark is not installed in parallel

- 61 -

S-143-2 : Line-mark is not installed in parallel

S-955 : Line-mark is not installed

S-151 : Line-mark is not installed

- 62 -

S-180 : Line-mark is not installed

S-180 : Line-mark direction error

S-180 : Line-mark is not installed

- 63 -

S-180 : Line-mark direction error

S-83 : Line-mark is not installed

S-138 : Line-mark is not installed

- 64 -

S-138 : Line-mark is not installed

S-135 : Line-mark is not installed

S-267 : Line-mark is not installed

- 65 -

S-263 : Line-mark is not installed

S-253 : Line-mark damage

S-121 : Line-mark direction error

- 66 -

S-340 : Line-mark is not installed S-346 : Line-mark is not installed

S-530 : Line-mark is not installed T-645 : Line-mark is not installed

T-615 : Line-mark direction error

- 67 -

S-841 : Line-mark is not installed S-608 : Line-mark is not installed

S-831 : Sign is not installed S-832 : Line-mark is not installed

S-825 : Line-mark is not installed S-817 : Line-mark is not installed

- 68 -

S-870 : Line-mark is not installed S-870 : Line-mark direction error

S-870 : Line-mark direction error S-848 : Line-mark is not installed

T-366 : Line-mark direction error S-565 : Line-mark is not installed

- 69 -

S-375 : Line-mark is not installed S-375 : Line-mark is not installed

S-955 : Line-mark is not installed

S-121 : The line-mark matches the piping but may be confusing. So we've used GPR to confirm

Difficult to pipe lines on drawings and no line marks, which can be confusing

The above picture shows the location of the pipe and the flow of LNG

- 70 -

7. GPR photos in Camp Carroll

(Check PE piping lines)

The GPR has determined that there are two lines on the road as a result of the GPR, which is not accurately represented in the drawing

S121

(Check PE piping lines)

The GPR has determined that there are two lines on the road as a result of the GPR, which is not accurately represented in the drawing

S121

(Check PE piping lines)

The GPR has determined that there are two lines on the road as a result of the GPR, which is not accurately represented in the drawing

S121

- 71 -

8. Valve indication photos in Camp Walker

V410-1 : Rod and handle is not existed V420-3 :Cover, rod and handle is not existed

V422-4 : Rod and handle is not existed V385-5 : Rod and handle is not existed

V350-8 : Rod and handle is not existed

Low buried depth V387-9 : Rod and handle is not existed

- 72 -

Valve is not existed

V387-10 : Rod and handle is not existed V103-13

Valve is not existed

V122-16 : Rod and handle is not existed V17

V316-18 : Rod and handle is not existed V370-22 : Rod is short

- 73 -

V579-24 : Pipe is exposed V312-27 : Rod and handle is not existed

V312-29 : Rod and handle is not existed V452-32 : Rod is not existed

V452-34 : Rod is not existed V210-37 : Rod and handle is not existed

- 74 -

V309-38 : Rod and handle is not existed V301-39 : Rod and handle is not existed

V301-40 : 핸들, 봉 없음 V570-45 : 핸들, 봉 없음

S353 V-add1 : Rod and handle is not existed

S301 V-add2 : Rod and handle is not existed

- 75 -

S373 V-add4 : Rod and handle is not existed

- 76 -

9. Valve gas leak test photograph in Camp Walker

V410-1 V420-2

V420-3 V422-4

V385-5 V385-6

- 77 -

V348-7 V350-8

V387-9 V387-10

V387-11 V368-12

- 78 -

Valve is not existed

V103-13 V108-14

V114-15 V122-16

V17 V316-18

- 79 -

V316-19 V301-20

V316-21 V370-22

V580-23 V579-24

- 80 -

V579-25 V376-26

V312-27 V312-28

V312-29 V335-30

- 81 -

V452-31 V452-32

V452-33 V452-34

V215-35 V209-36

- 82 -

V210-37 V309-38

V301-39 V301-40

V301-41 V413-42

- 83 -

V114-43 V141-44

V570-45 S353 V-add1

S301 V-add2 S376 V-add3

- 84 -

S373 V-add4

- 85 -

10. Valve operation inspection photograph in Camp Walker

V410-1 V420-2

V420-3 V422-4

V385-5 V385-6

- 86 -

V348-7 V350-8

V387-9 V387-10

V387-11 V368-12

- 87 -

Valve is not existed

V103-13 V108-14

V114-15 V122-16

V17 V316-18

- 88 -

V316-19 V301-20

V316-21 V370-22

V580-23 V579-24

- 89 -

V579-25 V376-26

V312-27 V312-28

V312-29 V335-30

- 90 -

V452-31 V452-32

V452-33 V452-34

V215-35 V209-36

- 91 -

V210-37 V309-38

V301-39 V301-40

V301-41 V413-42

- 92 -

V114-43 V141-44

V570-45 S353 V-add1

S301 V-add2 S376 V-add3

- 93 -

S373 V-add4

- 94 -

11. Line-mark indication photos in Camp Walker

S430 : Line-mark is not installed

S430 : Line-mark direction error

S341 Line-mark is not installed

- 95 -

S341 : Line-mark is not installed

S341 : Line-mark is not installed

S341 : Line-mark is not installed

- 96 -

S341 : Line-mark is not installed

S356 : Line-mark is not installed

T366 : Line-mark is not installed

- 97 -

T366 : Line-mark is not installed

S363 : Line-mark is not installed

S373 : Line-mark is not installed

- 98 -

S452 : Line-mark direction error

S452 : Line-mark is not installed

S410 : Line-mark direction error

- 99 -

S423 : Line-mark is not installed

S423 : Line-mark is not installed

S358 : Line-mark is not installed

- 100 -

S364 : Line-mark is not installed

S334 : Line-mark is not installed

S215 : Line-mark is not installed

- 101 -

S350 : Line-mark is not installed

S170 : Line-mark is not installed

S170 : Line-mark is not installed

- 102 -

151 : Line-mark is not installed

S153 : Line-mark is not installed

S162 : Line-mark is not installed

- 103 -

S154 : Line-mark is not installed

565 : Line-mark is not installed S230 : Line-mark is not installed

S230 : Line-mark is not installed 223 : Line-mark is not installed

- 104 -

S240 : Line-mark is not installed S578 : Line-mark is not installed

S575 : Line-mark is not installed SEQ : Line-mark is not installed

S580 : Line-mark is not installed S582 : Line-mark is not installed

- 105 -

12. Corrosion protection potential measurement photos in Camp Walker

S363

TB Corrosion protection potential measurement

Potential value : -1.1843V/cse

Pennslyvania

Avenue

TB Corrosion protection potential measurement

Potential value : -1.2089V/cse

S400

TB Corrosion protection potential measurement

Potential value : -1.2032V/cse

- 106 -

S452

TB Corrosion protection potential measurement

Potential value : -1.2423V/cse

V410-1

Valve Corrosion protection potential measurement

Potential value : -1.1275V/cse

- 107 -

13. Buried gas pipe detection Photos in Camp Walker

S341 : Pipe location detection

S410 : Pipe location detection (defect)

S373 : Pipe location detection

- 108 -

14. DCVG photos in Camp Walker

DCVG is performed for a section of 200M from the inlet part of the medium pressure pipe to governer

S410 Coating damage estimation : 1 point

S410

DEFECT

X1:30mv X2:40mv Y1:30mv Y2:30mv

SIDEDRAIN:50mv ON/OFF:800mv %IR:6.25

- 109 -

15. CIPS Photos in Camp Walker

CIPS is performed for a section of 200M from the inlet part of the medium pressure pipe to governer

S410

CIPS Graph

- 110 -

16. Valve indication photos in Camp Henry

S1712 V1_PE Valve S1712 V2_PE Valve

S1712 V3_PLP Valve

Rod and handle is not existed

S1712 V4_PLP밸브

Rod and handle is not existed

Valve is not in drawing but existed

S1712 V5_PLP Valve

Rod and handle is not existed S1712 V6_PE Valve

- 111 -

S1815 V7_PE Valve S1805 V8_PLP Valve

T1671 V9_PE Valve S1884 V10_PE Valve

S1535 V11_PE Valve S1501 V12_PE Valve

- 112 -

S1501 V13_PE Valve S1420 V14_PE Valve

S1501 V15_PE Valve S1705A V16_PE Valve

S1703 V17_PE Valve S1701 V18_PE Valve

- 113 -

S1701 V19_PE Valve_Handle is not existed S1222 V20_PE Vlave

Rod and handle is not existed

S1241 V21_PE Valve

Valve is not in drawing but existed

S1208B V22_PE Valve

Rod and handle is not existed

S1109 V24_PE Valve S1154 V25_PE Valve

- 114 -

S1131 V26_PE Valve S1106 V27_PE Valve

S1104 V28_PE Valve S1217 V29_PE Valve

S1217 V30_PE Valve S1654 V31_PLP Valve_Handle is not existed

- 115 -

S1654 V32_PE Valve S1413 V33_PE Valve

- 116 -

17. Valve gas leak test photograph in Camp Henry

S1712 V1 S1712 V2

S1712 V3 S1712 V4

S1712 V5 S1712 V6

- 117 -

S1815 V7 S1805 V8

T1671 V9 S1884 V10

S1535 V11 S1501 V12

- 118 -

S1501 V13 S1420 V14

S1501 V15 S1705A V16

S1703 V17 S1701 V18

- 119 -

S1701 V19 S1222 V20

S1241 V21 S1208B V22

S1115 V23 S1109 V24

- 120 -

S1154 V25 S1131 V26

S1106 V27 S1104 V28

S1217 V29 S1217 V30

- 121 -

S1654 V31 S1654 V32

S1413 V33

- 122 -

18. Valve operation inspection photograph in Henry

S1712 V1 S1712 V2

S1712 V3 S1712 V4

S1712 V5 S1712 V6

- 123 -

S1815 V7 S1805 V8

T1671 V9 S1884 V10

S1535 V11 S1501 V12

- 124 -

S1501 V13 S1420 V14

S1501 V15 S1705A V16

S1703 V17 S1701 V18

- 125 -

S1701 V19 S1222 V20

S1241 V21 S1208B V22

S1115 V23 S1109 V24

- 126 -

S1154 V25 S1131 V26

S1106 V27 S1104 V28

S1217 V29 S1217 V30

- 127 -

S1654 V31 S1654 V32

S1413 V33

- 128 -

19. Line-mark indication photos in Camp Henry

S1712 : Line-mark is not installed

S1715 : Line-mark is not installed

S1815 : Line-mark is not installed

- 129 -

S1104 : Line-mark is not installed

S1307 : Line-mark is not installed

S1611 : Line-mark is not installed

- 130 -

20. Corrosion protection potential measurement in Camp Henry

S1712 T/B Potential value: -1.6763V/cse

S1654 V31

Potential value : 0.001V/cse

Measure the potential of the surrounding user facility as the potential difference was measured on the valve, but the potential of the surrounding facility was not found

(picture attached below)

User facility potential measurement

Potential Value : -0.2880V/cse

Judging from this fact, it can be inferred that only valves are of PLP material and pipes are of PE material. The valve has no potential because the coating is well made and the piping is PE material.)

S1217

- 131 -

21. DCVG photos in Camp Henry

T1671 1814

1716 : Coating damage estimation : 1point

Multiple measurements of the coating damage estimation government in a similar position suggest that the position of the damaged parts changes every time and thus may be affected by interference. Also, the potential value of the nearby TB is estimated to be interference as it is estimated to be around 12V.

- 132 -

22. CIPS photos in Camp Henry

1716 : Corrosion protection potential measurement

CIPS Graph

- 133 -

Tool Measurement Amplitude Change Of Indication

MINOR MODERATE SEVERE

CIPS

Small Dips, on & off potentials both >

-0.850V/cse

(i.e. more negative)

Medium Dips, on potential >

-0.850V/cse

(i.e. more negative)

Off potential

< -0.850V/cse

(i.e. less negative)

Large Dips, on & off potentials both

< -0.850

(i.e. less negative)

DCVG

1-35%

Cathodic both on & off

35-50%

Cathodic on, anodic or neutral off

50-100% anodic both on & off

23. GTI Criteria severity classification Table

* GTI : Gas Technology Institute