TIBITOC - CASABLANCA WATER MAIN REHABILITATION,
BOGOTÁ, COLOMBIA

Jason Consultants was requested by the World Bank to undertake an initial review of a 32 km section of 2-metre diameter prestressed concrete cylinder pipe water main which forms a critical part of the water supply system to the city of Santa Fé de Bogotá, the capital of Colombia. The main had already burst several times resulting in fatalities.

Following this review and recommendations for rehabilitation, the client, EAAB, commissioned Jason Consultants to prepare specifications and contract documents to meet World Bank requirements for the three alternative rehabilitation methods initially recommended. Jason Consultants is managing the development and preparation of performance specifications and contract documents for the design and build contract for structural renovation of the pipeline and for associated new works. This method of procurement, unusual for the World Bank, was proposed by Jason Consultants to meet the particular needs of the client on this project.

Following contract award the client employed Jason Consultants to provide QA advice and technical support through the early stages of construction works.

Client: Empresa de Acueducto y Alcantarillado de Bogotá
Key Jason Personnel: James Thomson, Tom Sangster, Peter Rumsey.

CITY OF ST. LOUIS WATER DIVISION, CONDUIT REHABILITATION

Jason Consultants worked as a specialist consultant with Sverdrup Civil Inc. The project consisted of the rehabilitation of approximately 16.5 miles of 60” diameter steel water conduit between Howard Bend Water Treatment Works and the city limits.

Jason Consultants’ role was to provide specialist rehabilitation expertise to the lead consultant. The first stage of the project was the inspection and condition assessment of the existing conduit and to establish the evaluation criteria. The second stage was to evaluate the rehabilitation methods available and to prepare designs and specifications for the most appropriate methods in order to provide the client with a solution that combines technical integrity with cost-effectiveness.

Client: Sverdrup Civil Inc.
For: City of St. Louis, Water Division St. Louis, Missouri
Key Jason Personnel: Steve Kramer, Peter Rumsey.

EVALUATION OF TRENCHLESS RENEWAL SYSTEMS AND TECHNIQUES FOR GAS DISTRIBUTION MAINS

GRI issued a research contract to Jason Consultants to evaluate promising trenchless technologies for their potential use in rehabilitating or renewing gas distribution pipes. The participating utilities were allowed to select which trenchless method would be tested at their utility. Six trenchless renewal systems were tested at 10 GRI member companies. The tested systems were Amex 2000, Paltem, Swagelining, Tite Liner, U-Liner, and UltraPipe. The project documented the advantages, disadvantages, and lessons learned at each trial. The cost of the renewal method was also compared to conducting the work with conventional open-cut technology. Short-term laboratory tests were performed to evaluate the physical properties of the lining systems.

All of the trials were successfully completed although not always without difficulties. Several areas for future development were identified to help expand the utilisation of trenchless renewal techniques in the U.S. gas industry.

Client: Gas Research Institute (GRI) Chicago, Illinois
Key Jason Personnel: Steve Kramer

LAGOS, NIGERIA. WATER MAINS REHABILITATION

Jason Consultants were called in to provide specialist support to Canadian consulting engineers Reid Crowther in the development of a strategy for the rehabilitation of the water mains for a large sector of the City of Lagos, Nigeria.

The study involved a detailed assessment of the structural condition of the mains, an analysis of flow and pressure conditions, assessment of water quality and the use of this information in putting forward recommendations on the rehabilitation of the network. Recommendations were made on the organisation and screening of data, and the use of important existing information, to improve the assessment.

Client: Reid Crowther
For: Lagos Sewer and Water Commission
Key Jason Personnel: James Thomson

ASSESSMENT OF THE EFFECT OF SLEEVING ON
PE PIPE INSTALLED BY PIPE BURSTING

The need for installation of a protective, sacrificial sleeve when polyethylene pipe is installed by pipe bursting was investigated for North East Water, a UK subsidiary of Group Lyonnaise des Eaux. A comprehensive report on current practice was prepared which examines the different forms of pipe bursting, the external damage which is possible through the process, the properties of polyethylene pipe installed in this way, the costs involved and the risk-sharing between client and contractor.

A risk analysis was performed to provide the client with an objective method to identify the circumstances in which either sleeving or direct installation could be undertaken.

Client: North East Water, UK
Key Jason Personnel: Tom Sangster and Peter Rumsey.

CARACAS CITY TRUNK WATER MAIN

The City of Caracas has a 72 inch diameter steel trunk main laid some 27 years ago without cathodic protection in a congested area. A 2 kilometre section of the main, working under a pressure head of 200 metres, has consistently given problems and the main has a history of leaks, bursts and repairs which are now quite frequent. Jason Consultants have been commissioned to undertake a review of the structural condition of the main and prepare a report setting out the condition, the options for rehabilitation, the estimated costs and recommendations on the implementation of a program of rehabilitation works.
The study includes the collection and analysis of data on the history of the main, an internal and external inspection of the pipeline, a programme of pit depth and ultrasonic thickness gauge measurements, soil and groundwater sampling and testing, the assessment of the causes of pipe failure and the prediction of pipeline performance and failure patterns if no rehabilitation is carried out.

Client: IBRD, Washington DC
For: Hidrocapital Caracas, Venezuela
Key Jason Personnel: James Thomson; Peter Rumsey

TESTING AND EVALUATION OF SYSTEMS FOR LINING
GAS DISTRIBUTION SERVICE PIPES

Jason Consultants was contracted to test and evaluate trenchless rehabilitation systems for lining gas distribution service pipes developed by European and Japanese gas utilities. Jason conducted a technology evaluation that included visits to Japanese utilities to determine if the liner systems. could meet the needs of the U.S. gas industry. Currently, a program is being implemented to evaluate four technologies for lining gas services in actual U.S. operating conditions.
Client: Gas Research Institute (GRI) Chicago, Illinois
Key Jason Personnel: Steve Kramer.

TECHNICAL AND ECONOMIC EVALUATION OF
COMMERCIALLY AVAILABLE PIPELINE
REHABILITATION SYSTEMS

Jason Consultants were retained to identify rehabilitation systems not currently in use at Consolidated Edison of New York that may be worthy of further research, development, demonstration, or trial testing. For Consolidated Edison, which operates networks in a very congested and urban environment, methods that utilize trenchless techniques instead of traditional open-cut practices can provide significant benefits - from reduction in costs to improved customer relations. Rehabilitation systems utilised in North America, Europe, and Japan were studied and analysed. Jason recommended several systems for further investigation and trials in gas pipes. In addition, Jason staff prepared and conducted technical seminars to educate ConEd engineers and field personnel on how to design and implement trenchless programs at their utility.

Client: Consolidated Edison Company of New York, Inc. (ConEd) New York.
Key Jason Personnel: Steve Kramer.

ASSESSMENT AND REHABILITATION PLANNING OF THE WATER NETWORKS IN JUBAIL INDUSTRIAL CITY

Jubail Industrial City (JIC) is a major petrochemical complex located on the North-Eastern shores of the Arabian Peninsula. The majority of the pipes in the JIC water networks were laid in the early 1980’s with diameters ranging from 25 to 1500 mm. Pipe materials are uPVC, Asbestos Cement (AC), Ductile Iron (DI), Concrete Cylinder (CC), Steel Reinforced Concrete Cylinder (SRCC), and lately Glass -Reinforced Thermoset Resin Pipe (RTRP). In total there is a total of 780 km of pipe in the two potable water networks and over 200 km of pipe in the irrigation water distribution network.

The networks have suffered excessive breaks in segments of the uPVC pipes since their installation about 23 years ago. In addition, the AC pipes in the potable water network are the subject of a government decree that mandates their replacement and gradual phase out as they reach the age of 25 years, because of health concerns. Jason Consultants was retained to advise and participate in condition assessment, rehabilitation options and the preparation of bid documentation.
Pipe-break data and maintenance records were analysed to identify the uPVC pipes that should be replaced. The analysis was extended to establish the replacement priority of the pipes. Detailed hydraulic model simulation was used to determine network capacity, and identify pipes that should be upsized for hydraulic benefit.
The history and health issues surrounding AC pipes in the potable water systems were reviewed and best available practice to deal with AC pipes was identified. An extensive technology review was undertaken to identify the Least Cost Technically Viable Solution for uPVC pipe replacement, as well as for AC pipe rehabilitation. The first rehabilitation contract for the replacement of 50km of UPVC with PE by pipe bursting has been awarded.
Client: The Royal Commission for Jubail and Yanbu
With Pritchard Al Bassam (a Black and Veatch joint Venture)

Key Jason Personnel: Dr John W Heavens

WATER SERVICES – NORTHERN IRELAND
TRENCHLESS TECHNOLOGY GUIDELINES

Jason was commissioned by WS Atkins Belfast office to provide guidance for Water Services personnel in the form of a written guidelines reference document covering asset management principles, condition and risk assessment, all methodologies for construction and rehabilitation of water mains and sewers, decision making procedures leading to selection of Least Cost Technically Viable solutions, basic engineering cost estimates and social cost considerations. Guidance on safety and environmental issues, training and quality assurance was also included.

Client: WS Atkins for Water Services Northern Ireland
Key Jason Personnel: Dr. Dec Downey, Dr. John Heavens

CITY OF BALTIMORE LARGE DIAMETER WATER MAINS

Jason Consultants, in joint venture with Patton, Harris, Rust & Associates, has a contract with the City of Baltimore to develop a master inventory of 210 miles of 36” and above water mains, and based on an assessment of the risk of failure and the consequence of failure to develop a prioritization schedule for inspecting the mains. The inspection emphasis is to focus on seven PCCP water transmission mains. Remote field eddy current and internal sounding will be used initially to assess the condition of the PCCP mains. Condition assessment based on structural analysis with recommendations on either continued monitoring and/or rehabilitation to be developed for each main.

Client: The City of Baltimore, Bureau of Water and Wastewater
Key Jason Personnel: Robert S. Morrison, James C. Thomson

BELCHER ROAD 48” PCCP WATER MAIN REHABILITATION SCHEME
PINELLAS COUNTY UTILITIES

Jason Consultants, as a sub-consultant to the TBE Group, has investigated the condition of 3 miles of 48” PCCP pipe under Belcher Road, and based on the distressed state of the main has developed various rehabilitation schemes. Sliplining with PE, PVC, GRP and steel pipe, CIPP, as well as carbon fiber lamination and post-tensioning with steel tendons have all been analyzed with preliminary engineering cost estimates prepared.

Client: Pinellas County Utilities and the TBE Group
Key Jason Personnel: Robert S. Morrison, Dr. John Heavens