Uhambiso Consult has in-depth knowledge and extensive experience of water transmission and distribution systems. A capability statement and project reference list can be found here . Uhambiso uses the latest Computation Fluid Dynamics (CFD) solvers to investigate the behaviour of water transmission and distribution systems under various flow distributions, hydraulic actions and operating modes. This leads to robust and cost effective designs. The following types of analyses can be performed for transmission and distribution systems.

Single period analysis

The focus of a single period analysis (aka snapshot analysis) is to ensure that the supplied head to the system matches the required static head and system headlosses. Specifically, finding an efficient (snapshot) operating point on the pump and system curves. Typical deliverables include dimensioning of system components (eg. pipes and valves), as well as specifying pump sizes.

Extended period analysis

The focus of an extended period analysis is on finding an efficient operating range on the pump and system curves, by accounting for the daily/seasonal change in demand of the consumers. Typical deliverables include determining storage capacities of reservoirs and selecting pump sizes and pumping periods to minimise electrical costs while ensuring that peak demands are met.

Waterhammer analysis

The focus of a waterhammer analysis (aka surge analysis) is on adding surge protection devices to the system to ensure that the system is robust enough when surges occur. Surges occur typically during electrical outages or rapid valve movements. If the system cannot be relieved from these extreme pressure peaks then the safety of personnel and equipment can be placed in danger.

Reference projects

Project

Water transmission scheme

Location

Shuweihat (UAE)

Objective

The objectives of this study were to evaluate the minimum and maximum pressures on the upstream side of the pumping station and to provide recommendations for surge suppresion devices. This required building a detailed numerical model and investigating the protection provided by air vessels, hydraulic dampers, air valves and checkvalves (individually and in combination). This proved to be a challenging problem, since the steady, initial pressure condition was already very near atmospheric and no negative pressures were allowed during the transient. Recommendations were given for protecting the system.

Assesment of pipeline pressures, as well as air vessel fluid levels for various operating conditions. Optimization of air vessel fluid levels.

Position

Engineer/Researcher at Deltares

Project

Chris Hani rural water supply schemes

Location

Queenstown (South Africa)

Objective

Groundwater supply to rural communities. Design of pumpstations, pipelines and reservoirs.

Position

Engineer at Uhambiso

chatty micro

Project

25 Ml distribution reservoir

Location

Port Elizabeth (South Africa)

Objective

Design and construction supervison of a 25 Ml distribution reservoir. The purpose of this reservoir was to feed the lower lying areas of a new reticulation network. The higher areas were fed by a water tower which is again fed by the distribution reservoir via pumps.

Position

Engineer/Researcher at Uhambiso

Project

Seawater intake pipeline

Location

Mirfa (UAE)

Objective

The objectives of this study were to evaluate the pressures in a pipeline between a new seawater intake station and air separation plant. This required building a detailed numerical model of the pumping station, pipeline and plant. The study revealed that the design discharge would not be achieved based on the original design and that unacceptable pressures will be experienced on the upstream and downstream sides of the pumping station for full pump trip, single pump trip and emergency shutdown scenarios. Air valves, hydraulic dampers and orifices were designed to achieve the design discharge and to provide surge protection. Recommendations were also given in terms operational control at the pumping station and plant.

Position

Engineer/Researcher at Deltares

Project

Brine discharge pipeline

Location

Shuweihat (UAE)

Objective

The objective of this study was to evaluate pressures in the brine discharge line of a new desalination plant. This required building a detailed model. The study showed that the pressures were acceptable for full pump trip and single pump trip scenarios. Recommendations were given on the required dynamic characteristics of the checkvalves to avoid checkvalve slam.

Position

Engineer/Researcher at Deltares