표제지
목차
1. 서론 11
1.1. 연구의 배경 및 필요성 11
1.2. 연구목표 12
1) HDPE 파이프 협착 원인규명 12
2) HDPE 파이프 협착과 펌프룸 수위저하와의 인과관계 확인 13
3) 사례연구 자료공유와 동일문제 해결을 위한 참고자료 제공 13
1.3. 기존 연구동향 14
1.4. 연구의 범위 및 방법 15
1) 연구범위 15
2) 연구방법 15
3) 연구순서도 17
2. 연구사례 설명 18
2.1. 사례연구 대상 파이프 18
1) 파이프의 역사 18
2) 파이프의 특성 18
3) 사용 파이프의 규격 18
4) 파이프의 장점 20
5) 파이프의 단점 20
6) 파이프 제작 및 운송 21
7) 파이프의 연결 22
2.2. 일반적인 HDPE 파이프 부설공사 23
1) 콘크리트 웨이트 제작/체결공 23
2) 준설공 24
3) 파이프 설치공 26
2.3. 협착현상 사례설명 27
1) 사례 개요 27
2) 발전소 시스템 등 29
3) 발전소 운영 및 냉각수 부족현상 31
4) 발전소 별 냉각수 유량검토 33
3. 협착현상 조사 및 추정원인 35
3.1. 협착현상 조사 35
1) 조사방법 및 내용 35
2) 조사 결과 40
3.2. 협착현상 추정원인 42
1) 외부수압 및 부압 42
2) 각종 파이프 내부 압력관련 기준 45
3) 토압경감을 위한 인케이스먼트 설치연장의 적정성 49
4. 실험에 의한 협착현상 분석 52
4.1. 수치모형실험(관내 해수흐름에 의한 영향, 취수관의 수리학적 부압해석) 52
1) 취수관 유량 및 압력분포 해석 52
2) 부정류 수치해석을 통한 취수관의 부암발생 여부분석 58
3) 해양파랑 크기에 따른 부정류 해석 71
4.2. 수리모형실험 82
1) 실험개요 82
2) 실험준비 82
3) 실험실시 및 실험내용 84
4) 실험결과 및 ○○공사 협착현상과 비교 86
4.3. 파이프 안전성 확인 89
1) Wall 버클링 발생여부 89
2) 검토조건 89
3) 검토결과 91
5. 결론 및 향후 연구과제 92
5.1. 결론 92
5.2. 본 연구의 의미 93
5.3. 향후 연구가 필요한 항목 94
1) 부압발생 최소연장 연구 94
2) 적정한 조도계수의 중요성 94
참고자료 95
Abstract 96
국문초록 97
[Table. 2.1] ASTM D3350 Classification of reference materials 20
[Table. 2.2] Amount of coolant supply and quantity of variable intake at the time 32
[Table. 2.3] Surface level in the intake pump room 32
[Table. 2.4] Power plant A cooling water Quantity 33
[Table. 2.5] Power plant B cooling water Quantity 34
[Table. 3.1] Classification and cautions for subsea pipelines 45
[Table. 3.2] Major considerations of subsea water intake pipe 46
[Table. 3.3] Pressure Rating for Liquid Flow Surge Pressure 46
[Table. 3.4] Reasons for negative pressure generation 47
[Table. 3.5] Regulations for Negative Pressure Review 47
[Table. 3.6] Cause of buckling 47
[Table. 3.7] Under - pressure condition 48
[Table. 3.8] Elastic modulus of gravel(AWWA) 51
[Table. 4.1] The coefficient of friction(f) & Flow rate coefficient(C) 53
[Table. 4.2] Quantity(Q) by the coefficient of friction(f) 55
[Table. 4.3] Results of static pressure analysis due to water level change in the intake pumproom 57
[Table. 4.4] Scenario of transient flow analysis with water level change in pumproom 62
[Table. 4.5] Scenario 1 [EL(±)0.0m→EL(-)1.0m], take time 63sec 63
[Table. 4.6] Scenario 2 [EL(±)0.0m→EL(-)1.0m], take time 59sec 63
[Table. 4.7] Scenario 3 [EL(±)0.0m→EL(-)1.0m], take time 53sec 64
[Table. 4.8] Scenario 4 [EL(±)0.0m→EL(-)2.0m], take time 82sec 64
[Table. 4.9] Scenario 5 [EL(±)0.0m→EL(-)2.0m], take time 77sec 65
[Table. 4.10] Scenario 6 [EL(±)0.0m→EL(-)2.0m], take time 69sec 65
[Table. 4.11] Scenario 7 [EL(-)1.0m→EL(±)0.0m], take time 63sec 66
[Table. 4.12] Scenario 8 [EL(-)1.0m→EL(±)0.0m], take time 59sec 66
[Table. 4.13] Scenario 9 [EL(-)1.0m→EL(±)0.0m], take time 53sec 67
[Table. 4.14] Scenario 10 [EL(-)2.0m→EL(±)0.0m], take time 82sec 67
[Table. 4.15] Scenario 11 [EL(-)2.0m→EL(±)0.0m], take time 77sec 68
[Table. 4.16] Scenario 12 [EL(-)2.0m→EL(±)0.0m], take time 69sec 68
[Table. 4.17] Negative pressure generation due to water level 70
[Table. 4.18] Comparison of negative pressure size with water levels change 70
[Table. 4.19] Scenario an analysis of transient flow with loss head difference and waves height 71
[Table. 4.20] Intake pumproon seawater level - 1.0m, wave height 2.0m, inner diameter 2.33m 72
[Table. 4.21] Intake pumproon seawater level - 1.0m, wave height 3.0m, inner diameter 2.33m 72
[Table. 4.22] Intake pumproon seawater level - 1.0m, wave height 4.0m, inner diameter 2.33m 73
[Table. 4.23] Intake pumproon seawater level - 2.0m, wave height 2.0m, inner diameter 2.33m 73
[Table. 4.24] Intake pumproon seawater level - 2.0m, wave height 3.0m, inner diameter 2.33m 74
[Table. 4.25] Intake pumproon seawater level - 2.0m, wave height 4.0m, inner diameter 2.33m 74
[Table. 4.26] Intake pumproon seawater level - 3.0m, wave height 2.0m, inner diameter 2.33m 75
[Table. 4.27] Intake pumproon seawater level - 3.0m, wave height 3.0m, inner diameter 2.33m 75
[Table. 4.28] Intake pumproon seawater level - 3.0m, wave height 4.0m, inner diameter 2.33m 76
[Table. 4.29] Intake pumproon seawater level - 1.0m, wave height 2.0m, inner diameter 2.23m 76
[Table. 4.30] Intake pumproon seawater level - 1.0m, wave height 3.0m, inner diameter 2.23m 77
[Table. 4.31] Intake pumproon seawater level - 1.0m, wave height 4.0m, inner diameter 2.23m 77
[Table. 4.32] Intake pumproon seawater level - 2.0m, wave height 2.0m, inner diameter 2.23m 78
[Table. 4.33] Intake pumproon seawater level - 2.0m, wave height 3.0m, inner diameter 2.23m 78
[Table. 4.34] Intake pumproon seawater level - 2.0m, wave height 4.0m, inner diameter 2.23m 79
[Table. 4.35] Intake pumproon seawater level - 3.0m, wave height 2.0m, inner diameter 2.23m 79
[Table. 4.36] Intake pumproon seawater level - 3.0m, wave height 3.0m, inner diameter 2.23m 80
[Table. 4.37] Intake pumproon seawater level - 3.0m, wave height 4.0m, inner diameter 2.23m 80
[Table. 4.38] Analysis result of negative pressure generation due to intake pumproom water... 81
[Fig. 1.1] Research flowchart 17
[Fig. 2.1] Pipe spec 19
[Fig. 2.2] HDPE Pipe production 19
[Fig. 2.3] HDPE Manufacturing Plant and Transport 1 21
[Fig. 2.4] HDPE Manufacturing Plant and Transport 2 21
[Fig. 2.5] WIDOS, Pipe fusion section 22
[Fig. 2.6] Flange Connection 23
[Fig. 2.7] Concrete weight fabrication and tightening 24
[Fig. 2.8] Dredging Fleet 25
[Fig. 2.9] Pipe installation 26
[Fig. 2.10] Pipe installation concept 26
[Fig. 2.11] Overview diagram of the power plant cooling seawater pipelines 27
[Fig. 2.12] Transch cross section by area 28
[Fig. 2.13] Pipe Installation overview 28
[Fig. 2.14] General plant intake and discharge schematic diagram 29
[Fig. 2.15] Intake head structure and Cooling water discharge system 30
[Fig. 2.16] Thermal power plant coolant system 30
[Fig. 2.17] Chlorine injection system and chlorine injection tube 31
[Fig. 3.1] Intake pipe in side figure 37
[Fig. 3.2] I1 Intake pipe sketch by diver 38
[Fig. 3.3] I2 Intake pipe sketch by diver 39
[Fig. 3.4] I1 Intake pipe profile 39
[Fig. 3.5] I2 Intake pipe profile 40
[Fig. 3.6] Intake pipe damage area plan 40
[Fig. 3.7] I1 Intake pipe damage area 41
[Fig. 3.8] Bernouille's Theorem 42
[Fig. 3.9] Pressure change inside and outside pipe 1 43
[Fig. 3.10] Pressure change inside and outside pipe 2 43
[Fig. 3.11] Pressure change inside and outside pipe 3 44
[Fig. 3.12] Pressure change inside and outside pipe 4 44
[Fig. 3.13] Encasement spec 49
[Fig. 3.14] Encasement' s working load 49
[Fig. 3.15] Encasement installation 50
[Fig. 3.16] Resonable Encasement installation length 51
[Fig. 4.1] Static pressure measurement 5 point 56
[Fig. 4.2] Intake pumproom plan & section 58
[Fig. 4.3] The method of characteristics 59
[Fig. 4.4] POSCO E&C R&D center hydraulic model test water tank 82
[Fig. 4.5] POSCO E&C R&D center fertilities 83
[Fig. 4.6] Pipe installation 83
[Fig. 4.7] Induction of fluid flow through pump operation 84
[Fig. 4.8] Dye injection 84
[Fig. 4.9] Check occurrence of Buckling 85
[Fig. 4.10] Buckling Phenomenon moving 86
[Fig. 4.11] lifting pipe shape_1 87
[Fig. 4.12] lifting pipe shape_2 88
[Fig. 4.13] lifting pipe shape_3 88