Construction Works for the Rehabilitation of Centralized Irrigation Systems Along Nistru River
BIDDING DOCUMENTS
IFB #PP6/THVAP/W/CB/03
CONSTRUCTION WORKS FOR THE REHABILITATION OF CENTRALIZED IRRIGATION SYSTEMS ALONG NISTRU RIVER
Section IX
TECHNICAL SPECIFICATIONS
LOT #2 – CIS ‘COSNITA’
PARTICULAR TECHNICAL SPECIFICATIONS
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Rehabilitation Works on CISs along Nistru River IFB #PP6/THVAP/W/CB/03
Millennium Challenge Account – Moldova
PARTICULAR SPECIFICATION
TABLE OF CONTENTS
1 Particular technical specifications 6
2 SCOPE OF WORKS 6
2.1 INTRODUCTION 6
2.2 location of Works 6
2.3 Short description of the WORKS 7
2.4 Site information 9
2.4.1 Limits of the sites 9
2.4.2 Access to sites 9
2.4.3 Topography 9
2.4.4 Geology 10
2.4.5 Seismic activity 10
2.4.6 Temperature 10
2.4.7 Rainfall 11
2.4.8 Definitions 11
2.4.9 Submission by the Contractor 12
3 PIPELINE AND PIPEWORK 14
3.1 Pipe’s summary 14
3.2 Steel pipes 16
3.2.1 General 16
3.2.2 Coating & Lining of underground pipe and Fittings 17
3.2.2.1 Preparation of Metal Surfaces 18
3.2.2.2 External Polyethylene Coating for Pipes (PE) 18
3.2.2.3 Thickness of external Polyethylene Coating for Pipes (PE) 19
3.2.2.4 Composition and Application of Internal Epoxy Lining 20
3.2.2.5 Dry thickness Internal Epoxy Lining 21
3.2.2.6 Inspection 21
3.2.2.7 Field Completion of the Internal Epoxy Lining at Welded Pipe Joints 22
3.2.2.8 Field Completion of the External Coating at Welded Pipe Joints 25
3.2.3 Handling Transportation and Storage of Coated and Lined Steel Pipes and Fittings 25
3.3 HDPE pipe 26
3.4 CROSSING UNDER ROADS AND RAILWAY TRACKS 26
3.4.1 General 26
3.4.2 Detailed Design 27
3.4.3 Site Investigation 28
3.4.4 Records 28
3.5 FITTINGS 28
3.5.1 Steel elbow 28
3.5.2 HDPE elbows 28
3.5.3 HDPE reduction 29
3.5.4 Steel flanged reduction 29
3.5.5 HDPE Tee piece 29
3.5.6 HDPE flange adaptor 29
3.5.7 Steel flanged Tee/Cross 29
3.5.8 Steel flange 30
3.5.9 Special flanged HDPE T-piece 30
3.5.10 Special flanged pipes 30
3.5.11 Double flanged steel pipes for hydrant risers 30
3.5.12 Special hydrant valve 30
3.5.13 Hydrant 31
3.5.14 Air valves 31
3.5.15 Washout 31
3.6 Valves 32
3.6.1 Valves - general 32
3.6.2 Setting of Valves, etc. 35
3.6.3 Gaps for Valves, hydrants, Air valves, 36
4 DETAILED ELECTROMECHANICAL and electrical WORKS for pumping station Sp-1 37
4.1 Introduction 37
4.1.1 General description of the SP-1 pumping station 37
4.1.2 General principle of operation 37
4.1.3 Scope of Work 38
4.2 Hydro- and electro-mechanical equipment 39
4.2.1 Intake structures 39
4.2.2 Pumping units 39
4.2.3 Vacuum system 41
4.2.4 Dewatering system 42
4.2.5 Water hammer protection system 42
4.2.6 Pipes and fittings 43
4.2.7 Valves 43
4.2.8 Overhead travelling crane 44
4.2.9 Ventilation 44
4.3 Electrical equipment 45
4.3.1 Power supply 45
4.3.2 Power requirements 45
4.3.3 Low voltage electrical switch- and control gears 45
4.3.4 General incoming and protection switch gear 46
4.3.5 Motor starter switch gear with Variable Frequency Drive 47
4.3.6 Switch- and control gear for ancillaries 48
4.3.7 Command, automation and remote control switch- and control gear 50
4.3.8 Secondary incoming and protection switch gear common with SPP-2 51
4.3.9 Secondary switch- and control gear for ancillaries 51
4.3.10 Remote control panels for the main pumps 52
4.3.11 Remote control panel for the vacuum system 52
4.3.12 Remote control panel for the drainage pumps 53
4.4 Automation and SCADA system 53
4.4.1 Instrumentation and metering 53
4.4.2 Automation and Control philosophy 55
4.4.2.1 Operating modes 55
4.4.2.2 Control philosophy 55
4.4.2.3 Processing failure and alarms 59
4.4.2.4 Processing data and curves 60
4.4.3 PLC input /output 61
4.4.4 Supervisory Control and Data Acquisition system (SCADA) 65
4.4.4.1 Structure of the system 65
4.4.4.2 Remote Terminal Units 66
4.4.4.3 Remote controlled parameters 66
5 DETAILED ELECTROMECHANICAL and electrical WORKS FOR PUMPING STATION SP-2 68
5.1 Introduction 68
5.1.1 General description of the SP-2 pumping station 68
5.1.2 General principle of operation 68
5.1.3 Scope of Work 69
5.2 Hydro- and electro-mechanical equipment 70
5.2.1 Intake structures 70
5.2.2 Pumping units 71
5.2.3 Vacuum system 73
5.2.4 Dewatering system 74
5.2.5 Water hammer protection system 74
5.2.6 Pipes and fittings 75
5.2.7 Valves 75
5.2.8 Overhead travelling crane 76
5.2.9 Ventilation 77
5.3 Electrical equipment 77
5.3.1 Power supply 77
5.3.2 Power requirements 77
5.3.3 Low voltage electrical switch- and control gears 78
5.3.4 General incoming and protection switch gear 78
5.3.5 Motor starter switch gear with Variable Frequency Drive 79
5.3.6 Switch- and control gear for ancillaries 80
5.3.7 Command, automation and remote control switch- and control gear 82
5.3.8 Secondary incoming and protection switch gear common with SPP-2 84
5.3.9 Secondary switch- and control gear for ancillaries 84
5.3.10 Remote control panels for the main pumps 84
5.3.11 Remote control panel for the vacuum system 85
5.3.12 Remote control panel for the drainage pumps 85
5.3.13 Remote control panel for the water hammer protection system 86
5.4 Automation and SCADA system 86
5.4.1 Instrumentation and metering 86
5.4.2 Automation and Control philosophy 88
5.4.2.1 Operating modes 88
5.4.2.2 Control philosophy 89
5.4.2.3 Processing failure and alarms 93
5.4.2.4 Processing data and curves 94
5.4.3 PLC input /output 96
5.4.4 Supervisory Control and Data Acquisition system (SCADA) 100
5.4.4.1 Structure of the system 100
5.4.4.2 Remote Terminal Units 101
5.4.4.3 Remote controlled parameters 101
6 DETAILED ELECTROMECHANICAL and electrical WORKS for pumping station SP-3A 102
6.1 Introduction 102
6.1.1 General description of the SP-3A pumping station 102
6.1.2 General principle of operation 102
6.1.3 Scope of Work 103
6.2 Hydro- and electro-mechanical equipment 104
6.2.1 Intake structures 104
6.2.2 Pumping units 105
6.2.3 Vacuum system 106
6.2.4 Dewatering system 107
6.2.5 Water hammer protection system 108
6.2.6 Pipes and fittings 108
6.2.7 Valves 109
6.2.8 Overhead travelling crane 110
6.2.9 Ventilation 110
6.3 Electrical equipment 111
6.3.1 Power supply 111
6.3.2 Power requirements 111
6.3.3 Low voltage electrical switch- and control gears 111
6.3.4 General incoming and protection switch gear 112
6.3.5 Motor starter switch gear with Variable Frequency Drive 113
6.3.6 Switch- and control gear for ancillaries 114
6.3.7 Command, automation and remote control switch- and control gear 116
6.3.8 Secondary incoming and protection switch gear 117
6.3.9 Secondary switch- and control gear for ancillaries 117
6.3.10 Remote control panels for the main pumps 118
6.3.11 Remote control panel for the vacuum system 118
6.3.12 Remote control panel for the drainage pumps 119
6.3.13 Remote control panel for the water hammer protection system 119
6.4 Automation and SCADA system 120
6.4.1 Instrumentation and metering 120
6.4.2 Automation and Control philosophy 122
6.4.2.1 Operating modes 122
6.4.2.2 Control philosophy 122
6.4.2.3 Processing failure and alarms 127
6.4.2.4 Processing data and curves 128
6.4.3 PLC input /output 129
6.4.4 Supervisory Control and Data Acquisition system (SCADA) 133
6.4.4.1 Structure of the system 133
6.4.4.2 Remote Terminal Units 134
6.4.4.3 Remote controlled parameters 135
7 DETAILED ELECTROMECHANICAL and electrical WORKS for pumping station sp-4 136
7.1 Introduction 136
7.1.1 General description of the SP-4 pumping station 136
7.1.2 General principle of operation 136
7.1.3 Scope of Work 137
7.2 Hydro- and electro-mechanical equipment 138
7.2.1 Intake structures 138
7.2.2 Pumping units 139
7.2.2.1 Pumping units for SP-4A 139
7.2.2.2 Pumping units for SP-4B 141
7.2.3 Vacuum system 143
7.2.4 Dewatering system 144
7.2.5 Water hammer protection system 144
7.2.5.1 Water hammer protection system for SP-4A 144
7.2.5.2 Water hammer protection system for SP-4B 145
7.2.6 Pipes and fittings 145
7.2.6.1 Pipes and fittings for SP-4A 146
7.2.6.2 Pipes and fittings for SP-4B 146
7.2.6.3 Ancillary Pipes and fittings 147
7.2.7 Valves 147
7.2.7.1 Valves for SP-4A 147
7.2.7.2 Valves for SP-4B 147
7.2.7.3 Ancillary valves 148
7.2.8 Overhead travelling crane 148
7.2.9 Ventilation 149
7.2.9.1 Ventilation for SP-4A 149
7.2.9.2 Ventilation for SP-4B 149
7.3 Electrical equipment 150
7.3.1 Power supply 150
7.3.2 Power requirements 150
7.3.3 Low voltage electrical switch- and control gears 150
7.3.4 General incoming and protection switch gear 151
7.3.5 Motor starter switch gear with Variable Frequency Drive for SP-4A 152
7.3.6 Motor starter switch gear with Variable Frequency Drive for SP-4B 153
7.3.7 Switch- and control gear for ancillaries 154
7.3.8 Command, automation and remote control switch- and control gear 156
7.3.9 Secondary incoming and protection switch gear 158
7.3.10 Secondary switch- and control gear for ancillaries 158
7.3.11 Remote control panels for the main pumps 158
7.3.12 Remote control panel for the vacuum system 159
7.3.13 Remote control panel for the drainage pumps 160
7.3.14 Remote control panel for the water hammer protection system 160
7.4 Automation and SCADA system 161
7.4.1 Instrumentation and metering 161
7.4.2 Automation and Control philosophy 163
7.4.2.1 Operating modes 163
7.4.2.2 Control philosophy 163
7.4.2.3 Processing failure and alarms 168
7.4.2.4 Processing data and curves 169
7.4.3 PLC input /output 170
7.4.4 Supervisory Control And Data Acquisition system (SCADA) 174
7.4.4.1 Structure of the system 174
7.4.4.2 Remote Terminal Units 175
7.4.4.3 Remote controlled parameters 176
8 SPARE PARTS AND TOOLS 177
8.1 SPARE PARTS 177
8.1.1 Spare parts for pipe network 177
8.1.2 Spare parts for pumping station 177
8.2 TOOLS 179
9 ARCHITECTURAL/STRUCTURALWORKS IN THE PUMPING STATION 181
9.1 NEW PUMPING STATIONS 181
9.2 REHABILITATION WORKS 181
9.2.1 Flooring 181
9.2.2 Foundations for pumps, motors and tanks 181
9.2.3 Wall repairing 182
9.2.4 Damaged concrete repairing 182
9.2.5 Reinforcement of the building structure 182
9.2.6 Joints filling 183
9.2.7 Waterproofing 183
9.2.8 Roof repair and insulation 183
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Section IX. Specifications – Lot #2 / CIS ‘Cosnita’ vi
Rehabilitation Works on CISs along Nistru River IFB #PP6/THVAP/W/CB/03
Millennium Challenge Account – Moldova
1 Particular technical specifications
The Particular Technical Specifications (PTS) cover only those items that are specific to a particular scheme and includes:
· The scope of work
· Site information
· Pipe’s detailed specification
· Mechanical and electrical works in terms of specific performance and duty characteristics of pumping plant, motors and switchgear
The Particular Specification should be read in conjunction with the General Specification, which includes specifications and standards applicable to all work, materials, plant and equipment which are common to all schemes.
2 SCOPE OF WORKS
2.1 INTRODUCTION
The objectives of the contract is the construction, testing, commissioning and subsequent training of operation and maintenance staff in respect of the Rehabilitation of the Centralized Irrigation System in Cosnita (2483Ha). The Contract includes the furnishing of all labour, plant, equipment and materials required to complete the entire works, pre-commissioning, commissioning, testing, reinstatement of the Sites, preparation of working, shop and as-built drawings, training of operation and maintenance staff and the rectification of defects during the maintenance period specified in the Contract.
2.2 location of Works
The irrigation system Cosnita is located in Dubasari district on the left bank of Nistru River. The total irrigable area is about 2483 hectares and consists of the following four sectors laying between villages Cosnita and Pirita inside of an almost circular meander of the Nistru River:
Ø The first sector (called sector SP-1) of 1043 Ha is served by the pressure pumping station SP-1 taking water from Nistru River and delivering it directly to the pipe network.
Ø The second sector (called sector SP-2), of 365Ha is served by the pumping station SP-2 which takes water from Nistru River and delivers it directly to the pipe network. The irrigated land is situated on the left side of a sharp bend of River Nistru, to the south-west of the village Pirita.
Ø The third sector (called sector SP-3, S-1), of 583Ha is served by the supply pumping stations SP-3 which takes water from Nistru River and delivers it to the pressure pumping station S-1 which, in turn, delivers the water to the pipe network. The irrigated area is located on the left side of the steep curve of River Nistru, to the south-west of the village Cosnita
Ø The forth sector (called sector SP-4), comprising about 492Ha is served by the pump station SP-4.
The irrigation network has a total length of about 85 km and consists of distribution pipelines mainly made of asbestos-cement pipe sections of diameters variable between 160 and 400 mm and nominal pressure 8 bar.
2.3 Short description of the WORKS
The works comprise:
· The construction of a new pressure pumping station SP-1 close to the existing one including the river intake, located on the left bank of the Nistru River, including:
o Construction of the intake works, including installation of new fish protection devices and ice protection measures;
o Construction of a new building;
o Supply and installation of new pumps, motors, associated pipe-work and electric switch gear;
o Landscaping, installing the fence and install water drainage around pumping station SP-1.
· The construction of some 31.3 km of a new pipe network supplied by SP-1 and comprising:
o 2389 m of steel pipeline of 800 mm diameter;
o 2511 m of steel pipeline of 500 mm diameter;
o 626 m of HDPE pipeline of 400 mm diameter;
o 943 m of HDPE pipeline of 355 mm diameter;
o 5940 m of HDPE pipeline of 250 mm diameter;
o 1808 m of HDPE pipeline of 225 mm diameter;
o 8659 m of HDPE pipeline of 200 mm diameter;
o 1517 m of HDPE pipeline of 180 mm diameter;
o 7392 m of HDPE pipeline of 160 mm diameter;
o all necessary fittings, including new irrigation hydrants.
· The rehabilitation of the river intake and lifting pumping stations SP-2, located on the left bank of the Nistru River, including:
o replacing the intake works, including installation of new fish protection devices and ice protection measures;
o refurbishing the existing building and strengthening the structures to meet prevailing earthquake legislation including extension of the building with a new technical room for the electrical switch gears;
o supply and installation of new pumps, motors, associated pipe-work and electric switch gear;
o Landscaping, installing the fence and install water drainage around pumping station SP-2.
· The construction of some 12.3 km of a new pipe network supplied by SP-2 and comprising:
o 5 m of steel pipeline of 500 mm diameter;