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 #3 – CIS ‘ROSCANI’
PARTICULAR TECHNICAL SPECIFICATIONS
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Rehabilitation Works on CISs along Nistru RiverIFB #PP6/THVAP/W/CB/03
Millennium Challenge Account – Moldova
PARTICULAR SPECIFICATION
TABLE OF CONTENTS
1Particular technical specifications
2SCOPE OF WORKS
2.1INTRODUCTION
2.2location of Works
2.3Short description of the WORKS
2.4Site information
2.4.1Limits of the sites
2.4.2Access to sites
2.4.3Topography
2.4.4Geology
2.4.5Seismic activity
2.4.6Temperature
2.4.7Rainfall
2.4.8Definitions
2.4.9Submission by the Contractor
3PIPELINE AND PIPEWORK
3.1Pipe’s summary
3.2Steel pipes
3.2.1General
3.2.2Coating & Lining of underground pipe and Fittings
3.2.2.1Preparation of Metal Surfaces
3.2.2.2External Polyethylene Coating for Pipes (PE)
3.2.2.3Thickness of external Polyethylene Coating for Pipes (PE)
3.2.2.4Composition and Application of Internal Epoxy Lining
3.2.2.5Dry thickness Internal Epoxy Lining
3.2.2.6Inspection
3.2.2.7Field Completion of the Internal Epoxy Lining at Welded Pipe Joints
3.2.2.8Field Completion of the External Coating at Welded Pipe Joints
3.2.3Handling Transportation and Storage of Coated and Lined Steel Pipes and Fittings
3.3HDPE pipe
3.4FITTINGS
3.4.1Steel elbow
3.4.2HDPE elbows
3.4.3HDPE reduction
3.4.4Steel flanged reduction
3.4.5HDPE Tee piece
3.4.6HDPE flange adaptor
3.4.7Steel flanged Tee/Cross
3.4.8Steel flange
3.4.9Special flanged HDPE T-piece
3.4.10Special flanged pipes
3.4.11Double flanged steel pipes for hydrant risers
3.4.12Special hydrant valve
3.4.13Hydrant
3.4.14Air valves
3.4.15Washout
3.5Valves
3.5.1Valves - general
3.5.2Setting of Valves, etc.
3.5.3Gaps for Valves, hydrants, Air valves,
4DETAILED ELECTROMECHANICAL and electrical WORKS for pumping station S-20
4.1Introduction
4.1.1General description of the S-20 pumping station
4.1.2General principle of operation
4.1.3Scope of Work
4.2Hydro- and electro-mechanical equipment
4.2.1Intake structures
4.2.2Pumping units
4.2.3Vacuum system
4.2.4Dewatering system
4.2.5Water hammer protection system
4.2.6Pipes and fittings
4.2.7Valves
4.2.8Overhead travelling crane
4.2.9Ventilation
4.3Electrical equipment
4.3.1Power supply
4.3.2Power requirements
4.3.3Low voltage electrical switch- and control gears
4.3.4General incoming and protection switch gear
4.3.5Motor starter switch gear
4.3.6Switch- and control gear for ancillaries
4.3.7Command, automation and remote control switch- and control gear
4.3.8Lighting and sockets switch gear
4.3.9Remote control panels for the main pumps
4.3.10Remote control panel for the vacuum system
4.3.11Remote control panel for the drainage pumps
4.3.12Remote control panel for the water hammer protection system
4.4Automation and SCADA system
4.4.1Instrumentation and metering
4.4.2Automation and Control philosophy
4.4.2.1Operating modes
4.4.2.2Control philosophy
4.4.2.3Processing failure and alarms
4.4.2.4Processing data and curves
4.4.3PLC input /output
4.4.4Supervisory Control And Data Acquisition system (SCADA)
4.4.4.1Structure of the system
4.4.4.2Remote Terminal Units
4.4.4.3Remote controlled parameters
5DETAILED ELECTROMECHANICAL and electrical WORKS FOR PUMPING STATION S-22
5.1Introduction
5.1.1General description of the S-22 pumping station
5.1.2General principle of operation
5.1.3Scope of Work
5.2Hydro- and electro-mechanical equipment
5.2.1Pumping units for S-22A1
5.2.2Pumping units for S-22A2
5.2.3Pumping units for S-22B
5.2.4Vacuum system
5.2.5Dewatering system
5.2.6Water hammer protection system for S-22A1
5.2.7Water hammer protection system for S-22A2
5.2.8Water hammer protection system for S-22B
5.2.9Pipes and fittings
5.2.9.1Pipes and fittings for S-22A1
5.2.9.2Pipes and fittings for S-22A2
5.2.9.3Pipes and fittings for S-22B
5.2.9.4Ancillary Pipes and fittings
5.2.10Valves
5.2.10.1Valves for S-22A1
5.2.10.2Valves for S-22A2
5.2.10.3Valves for S-22B
5.2.10.4Ancillary valves
5.2.11Overhead travelling crane
5.2.12Ventilation
5.2.12.1Ventilation for S-22A1
5.2.12.2Ventilation for S-22A2
5.2.12.3Ventilation for S-22B
5.3Electrical equipment
5.3.1Power supply
5.3.2Power requirements
5.3.3Low voltage electrical switch- and control gears
5.3.4General incoming and protection switch gear
5.3.5Motor starter switch gear with Variable Frequency Drive for S-22A1
5.3.6Motor starter switch gear with Variable Frequency Drive for S-22A2
5.3.7Motor starter switch gear with Variable Frequency Drive for S-22B
5.3.8Switch- and control gear for ancillaries
5.3.9Command, automation and remote control switch- and control gear
5.3.10Lighting and sockets switch gear
5.3.11Remote control panels for the main pumps
5.3.12Remote control panel for the vacuum system
5.3.13Remote control panel for the drainage pumps
5.3.14Remote control panel for the water hammer protection system
5.4Automation and SCADA system
5.4.1Instrumentation and metering
5.4.2Automation and Control philosophy
5.4.2.1Operating modes
5.4.2.2Control philosophy
5.4.2.3Processing failure and alarms
5.4.2.4Processing data and curves
5.4.3PLC input /output
5.4.4Supervisory Control And Data Acquisition system (SCADA)
5.4.4.1Structure of the system
5.4.4.2Remote Terminal Units
5.4.4.3Remote controlled parameters
6ARCHITECTURAL/STRUCTURAL WORKS IN THE PUMPING STATION
6.1Flooring
6.2Foundations for pumps, motors and tanks
6.3Wall repairing
6.4Damaged concrete repairing
6.5Reinforcement of the building structure
6.6Joints filling
6.7Waterproofing
6.8Roof repair and insulation
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Section IX. Specifications – Lot #3 / CIS ‘Roscani’1
Rehabilitation Works on CISs along Nistru RiverIFB #PP6/THVAP/W/CB/03
Millennium Challenge Account – Moldova
1Particular technical specifications
The Particular Technical Specifications (PTS) covers only those items which are specific to a particular scheme and includes:
- Scope of work
- Site information
- Pipeline and Pipework
- Mechanical and Electrical works, in terms of specific performance and duty characteristics of pumping plants, motors and switchgear.
The PTS should be read in conjunction with the General Technical Specifications, which includes specifications and standards applicable to all work, materials, plant and equipment in common to all the schemes.
2SCOPE OF WORKS
2.1INTRODUCTION
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 Roscani (700 ha). 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.
2.2location of Works
The irrigation system of Roscani is located in the in district Anenii Noi rayon, North of the village of Roscani and Galilesti. It was put in operation in 1984. The total irrigation area is of about 700 Ha.
The irrigation system includes two sectors; the first sector, with an area of about 460 Ha, was built for fodder crop rotation in 19984 and the second sector, with an area of about 240 Ha, located to the North from the first sector, was added few years later. The irrigation areas lay near the Nistru River that flows North and South the CIS in a meander.
2.3Short description of the WORKS
The works comprise:
- The rehabilitation of the river intake and lifting pumping stations SP20, located on the right bank of the Nistru River, including:
- replacing the intake works, including installation of new fish protection devices and ice protection measures;
- refurbishing the existing buildings and strengthening the structures to meet prevailing earthquake legislation;
- supply and installation of new pumps, motors, associated pipe-work and electric switch gear;
- landscaping, installing the fence and install water removal on the land around pumping stations SP20;
- The rehabilitation of the river intake and pressure pumping station SP22 including:
- replacing the intake works, including installation of new fish protection devices and ice protection measures;
- refurbishing the existing buildings and strengthening the structures to meet prevailing earthquake legislation;
- supply and installation of new pumps, motors, associated pipe-work and electric switch gear;
- landscaping, installing the fence and install water removal on the land around pumping stations SP22.
- The construction of some 18,18 km of a new pipe network consisting of steel pipe (diameter 700 mm) and HDPE pipes (diameters 160 mm to 400 mm) supplied by pumping station SP22 including all necessary valves and fittings and new irrigation hydrants
2.4Site information
2.4.1Limits of the sites
For the purpose of carrying out the Works the Contractor shall limit his installations and operations to the defined working areas described on the Contract drawings. The Contractor shall be responsible for complying with all relevant bylaws of related Municipalities, Utilities and Authorities and obtaining all necessary permits and licenses.
2.4.2Access to sites
The projects area is located on right bank of the Nistru River, North of the villages of Roscani and Galilesti. Access to the river intakes and pumping stations is via non-paved roads. Access to the pipelines is either via the working easement along the existing pipelines or via the farm tracks, which intersect the area.
2.4.3Topography
The Roscani irrigation areas are mostly on large terraces, with slopes not exceeding 5%. The absolute elevations of the relief vary within 30.00 – 80.00 m Baltic System.
2.4.4Geology
Under geomorphologic zoning, this territory is located on the Dniester River terrace plain and is confined to the Middle-Dniester sub-district being zone bordering with the Trans-Dniester swell-like upland. The Middle-Dniester sub-district is represented almost completely by the late Pliocene terraces of the Dniester River.
This region is featured by prevailing valley-terrace, shapes of relief dissected by the Pleistocene-Holocene age and modern erosion processes into the series of smaller areas.
The information Document attached to the Tender Documents contains Surveys from a 2012 investigation in the project areas. Within the explored depth of 3.0 m, performed geotechnical investigations make it possible to mark out modern and quaternary terrace deposits. Quaternary deposits are represented by alluvial-deluvial deposits of floodplain and terraces above the floodplain of the Dniester River. Within boundaries of the given area, there are deposits of middle and upper Pliocene represented by sands with gravel lenses (rare by clays) at the bottom and conglomerates, pebble gravel, sands, loams and fossil soils at the top.
The hydrographical network is determined by the Dniester River course. At the explored depth for the network survey, there are no underground waters found. On the borehole near S20 groundwater was found at a depth of 9.4 m. During the flood it can rise up to a depth of 1,5 m-2,0 m.
The Contractor is required to undertake his own investigations and to satisfy himself as the geological conditions in the project area in so far as these may affect the Works.
2.4.5Seismic activity
The current and official documents concerning seismic design parameters of Moldova are included in the Decree #25 dated 23 December 2009 of the Ministry of Construction and Regional Development "Approval of the Seismic Regions in the Republic of Moldova at scale 1:400,000". The Seismic Regionalization Map shows that Roscani project area is included in the “7-degree seismic zone”.
2.4.6Temperature
The temperature regime is temperate continental climate, characterized by hot summers and cold winters. Tables 1.1and 1.2 shows the average monthly temperatures for the project area sites.
Table 1.1- Monthly average air temperatures C° (1980-2007)
Meteorological station / Jan / Feb / Mar / Apr / May / Jun / Jul / Aug / Sep / Oct / Nov / Dec / YearDubasari / -1,9 / -1,1 / 3,5 / 10,5 / 16,6 / 20,1 / 22,2 / 21,5 / 16,3 / 10,5 / 3,9 / -0,4 / 10,1
Table 1.2- Monthly minimum air temperatures C° (1980-2007)
Meteorological station / Jan / Feb / Mar / Apr / May / Jun / Jul / Aug / Sep / Oct / Nov / Dec / YearDubasari / -9,3 / -11 / -2,9 / 7,1 / 13,9 / 18,1 / 19,3 / 18,5 / 12,9 / 8,2 / -1,9 / -6,3 / 8
2.4.7Rainfall
Average monthly rainfall for the project area sites are indicated in Table 1.3.
Table 1.3- Monthly average rainfall mm (1980-2007)
Meteorological station / Jan / Feb / Mar / Apr / May / Jun / Jul / Aug / Sep / Oct / Nov / Dec / YearDubasari / 35 / 30 / 35 / 41 / 50 / 68 / 66 / 58 / 52 / 41 / 43 / 36 / 554
2.4.8Definitions
The following terms shall have the meanings hereby assigned to them:—
‘Topsoil’ / any surface material capable of supporting vegetation and suitable for use in soiling areas to be grassed or cultivated.‘Rock’ / naturally-occurring material which in the opinion of the Engineer would normally have to be loosened either by blasting or by the use of pneumatic tools (other than clay spades) or by other rock quarrying methods or, if excavated by hand, by the use of wedges and sledge hammers. An isolated solid boulder or detached piece of rock shall qualify as Rock only if it exceeds 0.2m³ in volume.
‘Bulk Excavation’ / excavation in open cut (excluding Trench Excavation) down to levels specified in the Drawings or otherwise as being the general levels after completion of excavation other than Incidental Excavation.
‘Trench Excavation’ / excavation, to levels and limits specified in the Drawings or otherwise, of trenches into which pipes and the like are to be laid.
‘Incidental Excavation’ / excavation (generally in small quantities) below or outside the limits of Bulk Excavation and Trench Excavation, but excluding Excess Excavation.
‘Excess Excavation’ / excavation outside the limits specified for Bulk, Trench or Incidental Excavation.
“HDPE” / High Density Polyethylene
2.4.9Submission by the Contractor
Submissions which the Contractor is required to make in relation to earthworks include, where relevant, the following:
Drawings and surveynotes:
—Contractors record drawings of the ground level survey prior to the start of any earthwork;
—Information obtained from trial holes ordered by the Engineer;
—Contractors record drawings of any other level surveys taken for the purposes of measurement of quantities of excavation or filling, such as Rock level surveys;
(Survey record drawings as specified above shall be submitted within 7days of the completion of the survey work recorded on them.)
—Survey notes on depths of Trench Excavation;
—Proposals to excavate with sloping faces without support.
—General arrangements;
—General assembly, detailed shop and erection drawings;
—Detailed manufacturing drawings.
Data:
—Calculations for connection details, where requested by the Engineer;
—Welding procedure sheets.
Certificates:
—mill tests, factory tests;
—laboratory tests;
—field tests;
—conformity certificates.
Details of proposed methods:
—proposed methods of excavation, transport of materials, filling and compaction;
—proposed method of asbestos-cement handling and disposal;
—proposed source of free-draining fill and methods of selective excavation or processing;
—program for quality control of earthworks and proposals for the use of off-Site laboratories.
Samples:
—materials proposed for filling and for geotextiles, where specified or where specifically required by the Engineer;
—materials proposed for filling joints between concrete slabs, pipes and concrete walls, any other joints requested by the Engineer.
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Section IX. Specifications – Lot #3 / CIS ‘Roscani’1
Rehabilitation Works on CISs along Nistru RiverIFB #PP6/THVAP/W/CB/03
Millennium Challenge Account – Moldova
3PIPELINE AND PIPEWORK
3.1Pipe’s summary
The pipelines are briefly described and quantified in Table 3.1 below:
Table 3.1 Breakdown of pipelines length for each material, diameter and type
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Section IX. Specifications – Lot #3 / CIS ‘Roscani’1
Rehabilitation Works on CISs along Nistru RiverIFB #PP6/THVAP/W/CB/03
Millennium Challenge Account – Moldova
3.2Steel pipes
3.2.1General
The pipelines must be manufactured according to General Technical Specification requirements, as per clause 5.2.2. The pipelines are briefly described and quantified in Table 3-1.
Steel pipes and fittings shall be manufactured by a spiral or longitudinal weld process and shall conform to the requirements of EN 10224. Steel quality shall conform to EN 10025 grade S275JR. Outside diameters and wall thicknesses shall comply with EN 10024, where otherwise specified, with wall thicknesses as shown on the drawings.
Pipes shall either be coated externally when laid underground as per clause 3.2.2, or painted externally with epoxy lining of 400 micron in thickness when laid above ground, in ducts or inside buildings. In both cases they shall be internally lined at the manufacturer's works with either an approved epoxy-based or similar lining. The finished internal lining shall be continuous across all welded joints.
Pipes shall be supplied with plain ends either to fit flexible couplings or suitable for butt-welding.
All pipes and specials to be joined by welding shall have the external protection stopped back at the ends at a distance sufficient to permit welding of the joints without damage to the protection, as further detailed hereafter.
For other than welded joints, the external protection shall, if necessary, be stopped back at a distance sufficient to permit assembly of the joint.
The internal protection shall extend to the end of pipes to be jointed by flexible couplings, and shall be stopped back as specified hereafter for pipes to be butt welded.
For pipes jointed by welding or by flanged joints, external protection shall be completed using the identical coating and lining material and material profile used on the main pipe barrel. Alternatively, the joint may be wrapped to a similar standard and thickness of protection using appropriate tape and paste or other protective material, all of which subject to the approval of the Engineer.
Straight pipes shall be supplied in nominal lengths of 12 m or as otherwise agreed with the Engineer.
Branches shall be formed by welding and shall be welded before the pipe is erected.
Pipe flanges shall be either “steel welding neck flanges” or “steel plate flanges for welding”, both conforming to up to 40 bar, or to other equivalent and approved standard, and welded on in accordance with UNI-EN 2277-2278 or to other equivalent and approved standard.
The pipes shall be supplied with plain ends, and should be coupled by butt welding according UNI-EN 10520, if not otherwise specified elsewhere.
3.2.2Coating & Lining of underground pipe and Fittings
The steel pipes to be laid underground shall be coated as following specified:
- Passive external protection of pipes and fittings shall be provided by the application of polyethylene and polyurethane-modified coating, respectively;
- Internal protection of pipes and fittings shall be provided by the application of a liquid epoxy lining (400 microns dry thickness).
Save as otherwise prescribed by this Specification, the following Standards shall apply:
- DIN 30670/91 (Polyethylene coating for steel pipes and fittings);
- UNI 9099/89 (Steel pipes and fittings for buried or submerged pipelines - External polyethylene coating applied by extrusion);
- DIN 30671/92 (Thermoset plastic coatings for buried steel pipes);
- NF A 49-706/86 (Revêtement externe en poudre époxydique sur tubes);
- NF A 49-709/92 (Revêtements internes par peinture liquide à base de résine époxidique, brai-époxidique et brai-polyuréthanne);
- AWWA C210/92 (Liquid epoxy coating system for the interior and exterior of steel water pipelines);
- ISO 527-3/95 (Plastics - Determination of tensile properties - Test conditions for films and sheets);
- ISO 868/85 (Plastics and ebonite - Determination of indentation hardness by means of a durometer);
- ISO 2808/91 (Paints and varnishes - Determination of film thickness);
- ISO 4287-1/84 (Surface roughness - Terminology - Surface and its parameters);
- ISO 8501-1/94 (Preparation of steel substrates before application of paints and related products - Visual assessment of surface cleanliness).
This Specification covers the minimum technical requirements for the preparation and application of the coating and lining of the steel pipes and fittings, and the Contractor shall submit fully detailed proposals of the coating and lining systems for the Engineer's approval.