Alaska sealife center seawater intake pipelines biofouling. Finally, the design approach for seawater intake structures, brine outfalls and the. The specialised water control gates are designed to withstand 30tn water load with a design compliant to earthquake loading including seismic load from water column. Additionally, the nonmetallic pipes have smoother interior pipe. Research pilot plant international guidelines who 2007. Final supplemental environmental impact report seawater. Distance of the intake window from the seabed maritime climate as with any maritime engineering design. Design, construction and erection of seawater intake system. The primary focus of this chapter is the design and installation of underwater lines by the floatandsink method that is made. Since 1979 makai has designed a number of bottom mounted, downtheslope, catenary, and pendant polyethylene pipelines for use in swac and outfalls. The wet well location just north of a seawater intake structure to the west of. Elmosa offshore seawater intake systems consist of. Real footage taken during an inspection of a seawater intake pipe 400 mm diameter in quite dirty water.
Additionally, the nonmetallic pipes have smoother interior pipe surfaces than concrete pipes, and therefore have a lower friction coefficient. In addition to serving as the physical inflow infrastructure, the intake system functions as the initial. The objective of the design process for pipeline of intake and outfall system is therefore to determine the size of pipeline which ensure flow rate which systems required. An overview of seawater intake facilities for seawater desalination. Flng water intake risers floating liquefied natural gas flng units require large volumes of seawater to boost the gas liquefaction process efficiency.
The head of the intake is where the seawater is drawn in and will be designed to achieve the maximum velocity. Seawater intake main and pump station the seawater intake main extends 220 metres offshore with a coarse intake screen at a depth of approximately 8 metres at low tide. On the surface, the design of seawater intake systems appears relatively easy. The invisihead applying negligibly low suction forces drastically reduces the inflow of debris. Cleaning the seawater intake pipeline by pigging is then required as a build up of marine growth will cause a reduced flow of water at the desalination plant. The paper discusses the core analysis, engineering design and. Ntroductioni this report summarizes work carried out by makai ocean engineering, inc. Seawater desalination plant intakes impingement and entrainment page 2 attention to seawater intake impingement and entrainment issues is partially prompted by the section 316b of the 1972 clean water act that regulates cooling water intake of the steam.
Pdf a novel installation methodology for ultralarge seawater. Seawater desalination the carlsbad desalination project. If sea water intake pipeline cleaning is not performed, then it could result in a pipeline blockage or cause the desalination plant to underperform or even force a plant shutdown. A seawater intake system with four 1500 m ultralarge diameter steel pipelines 2700 mm dia. Design and construction international conference on desalination, environment and marine outfall systems. Based on this, a novel alternative design for seawater intake is to use a single large diameter 60in70in steel caisson riser. Waters marine inspected the pipe 500, metres long, to determine the build up of growth in. The total flow of seawater required for various experiments was calculated as 160 m 3 h and the system was accordingly designed. It is not the intent of this chapter to cover the many other design, construction and safety issues that need to be considered in a marine installation. Intake pipelines are protected by armour stone from waves, small boats anchoring, etc. Design of intake may vary based on the type of dam. Seawater desalination plant intakesimpingement and entrainment page 2. Much coastal water around the world hold high concentration of total suspended. Proposed intake and outfall configuration at tongaat 224 figure 2.
Seawater desalination plant intakes impingement and entrainment page 7 such specific example of dramatic environmental impact is the reduction of the habitat of delta smelt as a result of overpumping caused by california state water projects intake facilities. The parameters have been reproduced at table 71 below. Distance of the intake window from the seabed maritime climate as with any maritime engineering design project, the wave effect of the enclave of the works is a. The seawater intake is a critically important component of any desalination system.
Because the design of seawater intake systems superficially appears simple, often the data used is insufficient to evaluate the many parameters that can adversely affect the performance of a seawater intake properly. The risers connect the intake heads to the pipeline. Design, operating and research experience at the penneshaw. Docx 5 copyright 2014 by ch2m hill canada limited x all rights reserved x company confidential 2.
The invisihead is positioned at the upstream end located between 50. The invisihead is a hydraulically invisible seawater intake velocity cap system fitted to the upstream pipeline inlet located offshore. However, it is important to note that the project description details are preliminary at. The primary objective of these structures is to supply a reliable quantity of clean seawater, which can be used as per plant or refinery requirements. The alaska sealife center contracted pnd engineers, inc. An overview of seawater intake facilities for seawater. Sea water flows under gravity to the sea water pumping station. The design basis for water pipelines has a much more recent history. Installation and design of large diameter of hdpe pipeline.
Our epc division has a leadership position in seawater intake outfalls while our inhouse geosciences, oceanography service vertical as also our engineering team provides us the unique capability of providing a thoughttothroughput tm solution to our clients for such projects. Open channel type intakes attract large deposition of sediments and hence periodic maintenance dredging is essential. The seawater supply and discharge system planned by dwd is. Nations environmental programme 2008 resource and guidance manual. Main components of the microtunnel boring machine based infrastructure at tongaat 224 figure 211a. Worksafebc occupational health and safety regulation 2. Pdf a seawater intake system with four 1500 m ultralarge diameter steel pipelines. Preliminary design of the ocean intake and discharge pipelines.
Finally, the design approach for seawater intake structures, brine outfalls and the connecting marine pipelines is provided in the form of flow diagrams. This paper will briefly outline the preliminary concept verification and concentrate on the engineering of the concept in terms of design optimization, costschedule, construction, and. Desalination technology and sea water intake pipe pig. Mar 09, 2012 real footage taken during an inspection of a seawater intake pipe 400 mm diameter in quite dirty water. The coarse screen prevents most fish and larger weed clumps entering the intake pipeline. The data from the pilot plant will be used to inform the detailed design of the actual. The pipeline a 10mile pipeline delivers water from the. The intake pipe should be nonmetallic to mitigate the corrosion issues that are present in a submerged seawater application. The omni directional invisihead ih intake head system adds to the performance of the.
It is a type of intake which may either located sufficiently inside the river so that demands of water are met with in all the seasons of the year, or they may be located near the river bank where a sufficient depth of water is available. The invisihead, a hydraulically invisible seawater intake head system fitted to the upstream intake pipeline inlet located offshore. Pnd recommends the design and installation of a pig launcher and intake cages at the ends of each 24inch pipeline to. The intake main is a dn280 highdensity polyethylene pipe, weighed down. Pdf a novel installation methodology for ultralarge. Investigation of sea water intake alternatives at shores.
The total distance of the intake alignment from the preferred wet well location to the 45m deep intake is 1. Generally submerged intakes are preferred for lake intakes. Location of the proposed tongaat desalination plant 225. Guidance provided herein on the design and installation of pe piping is limited to those issues that are specific or are related to this dd 360 11609 10. Freshwater intake end rof rpipe fish screen guidelines, department of fisheries and oceans, 1995 8. Design and construction of a system to clean pig the pipelines of marine invertebrate animals that.
Seawater intake and outfall systems our epc division has a leadership position in seawater intake outfalls while our inhouse geosciences, oceanography service vertical as also our engineering team provides us the unique capability of providing a thoughttothroughput tm solution to our clients for such projects. Investigation of sea water intake alternatives at shores with. The floatandsink installation method was adopted to laying the pipeline with 2500mm diameter into the seabed in the project. A marine pipeline installation may involve considerable risk to the pipeline integrity both during installation and while in service. Seawater desalination facilities require an intake system capable of providing a. The seawater intake structures are used, above all, in desalination plants, fish farms. The seawater intake system draws seawater directly from the sea and discharges into a main seawater sump which has a capacity of around 40 m 3. For continuous operation, seawater intake structures require protective screens to prevent debris and marine life entering and damaging the pumps.
Seawater desalination plant intakesimpingement and entrainment page 6 such specific example of dramatic environmental impact is the reduction of the habitat of delta smelt as a result ofoverpumping caused by california state water projects intake faci lities. Elmosa seawater intake systemselmosa seawater intake systems the invisihead patented, the pipeline whether it is made of steel, steel lined with pol yethylene, concrete, or high density polyethylene hdpe pipe, and the natsep patented all form the complete elmosa offshoreonshore seawater intake sy stem. Table 2 typical design current densities for protecting bare steel in seawater standard tidal flow aeration initial mean average bs 7361. Elmosa seawater intake systemselmosa seawater intake systems the invisiheadpatented, the pipeline whether it is made of steel, steel lined with pol yethylene, concrete, or high density polyethylene hdpe pipe, and the natsep patented all form the complete elmosa offshoreonshore seawater intake sy stem. In a report dated january 21, 2010, pnd recommends the design and installation of a pig launcher and intake cages at the ends of each 24inch pipeline to capture the pig. Design, construction and erection of seawater intake. The need for improved seawater intake systems for seawater reverse.
Depending on the location of the inlet structure, the intakes can be. The cover placed over the vertical terminal of an offshore intake pipe is called a. A major criterion for the test facility was that continuous supply of seawater should be available at the rate of 160 m 3 h. Seawater intake systems american eco systems seawater. The aims of the paper are to present the design procedure of the large hdpe pipeline. Install four 1millimeter wedgewire screens with a throughscreen velocity of 0. An overview of seawater intake facilities for seawater desalination tom pankratz 1 abstract seawater desalination facilities require an intake system capable of providing a reliable quantity of clean seawater with a minimum ecological impact. Hence a seawater intake system has been designed, constructed and erected so that virgin seawater will be available for biofouling studies that was proposed to be carried in a once through flow test facility. All penstocks will be fitted with auma 3phase actuators. Aug 15, 2014 changing of the aksa seawater intake pit from the seawater intake pipeline end. Seawater desalination the claude bud lewis desalination plant and related facilities seawater desalination the carlsbad desalination project the power plants cooling water pumps will remain in service while poseidon installs and commissions the new intake pumps. Seawater desalination intake technical feasibility study.
The seawater inlet consists of a 2,000mm diameter glass fibber reinforced polyester submarine pipe, which. The intake system for the project is designed to intake seawater of 108,240 m3 per hour with hdpe pipeline and finally designed to 1. Makai on an engineering and conceptual design analysis of a seawater supply system for a desalination system at moss landing, california. An ultralarge seawater intake pipeline 2700 mm diameter containing four parallel strings 1500 m each had been fabricated assuming to be installed using individual float and free flood method. Ocean water desalination intake biofouling and corrosion study. For screen intakes the epa, nmfs and cdfg design standards for approach velocity range from 0. The ballast weight are clamped along with the pipeline as designed space. October 31, 2014 monterey bay regional water project.
Muscat, oman eloy pita eloy pita, increa, c buganvilla 6, portal 1, 1. Design guidelines of seawater intake systems encyclopedia of. Intake system scheme from left to right, pumphouse, intake pipes and raiser the sea water intake riser, shown below in figure 7, uses a velocity cap arrangement and bar screen. Basic design of seawater drainage facilities grp pipe. Page j s cost estimating manual for pipelines and marine structures. In july 2016, poseidon applied to the commission to amend prc 1980. Preliminary design of ocean intake and discharge deepwater desal. The following design guidelines, which are specified in the coastal engineering manual em. Morocco laayoune new phosphate port bidding design wharf trestle intake structure breakwater. Subseafloor intake systems that draw ocean water through the sand on the seafloor have intake water approach velocities water going into the sand of less than 0. Depending on the location of the inlet structure, the intakes can be onshore or offshore. Seawater intakes are an integral part of every seawater desalination plant. Seawater air conditioning swac ocean thermal energy conversion otec marine outfalls aquaculture and mariculture industrial cooling and power.
A conceptual design of seawater pipelines for the deep water desal project prepared for deep water desal, llc 7532 sandholdt rd. Feasibility of gallery intake systems for seawater reverse osmosis. An innovative design the invisihead ih an omnidirectional intake head system is fitted to the upstream end of the intake system pipeline located some distance into the sea from the shoreline. At super slow approach and entrance velocities, the ih intake head becomes hydraulically invisible to suspended matter. To meet these objectives, it is essential that a thorough assessment of site conditions be conducted. The cribs are made of heavy timber frame work which is partly or wholly filled with riprap to protect the intake conduit against damage by waves etc. Abstract submarine pipeline is used as a seawater intake system since it is cost effective compared to canal and jetty type intake structures. The seawater intake is designed to supply the water for the plant when enlarged as planned, which will require a total of 5,730 m3 hour. Because the design of seawater intake systems superficially appears simple, often the. Design factors and variables, potential size, piping system, geometry of the.
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