A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Life-Cycle Procurement of Pumping Equipment for a 50,000 Horsepower Raw Water Supply System: The Southern Delivery System
Energy efficiency is a critical consideration for all water infrastructure projects. This is especially true for large water transmission pumping systems in which the energy costs over the life of the installed equipment can be as much as five times that of the initial purchase price. Colorado Springs Utilities is currently constructing the Southern Delivery System (SDS) project, which includes more than 50 mi of water transmission pipeline, three large raw water pump stations, and a water treatment plant (WTP). To minimize life-cycle costs (LCCs), the pumps, motors, and variable frequency drives (VFDs) were procured using a unique LCC procurement strategy. Pumping equipment typically is procured by selecting the pump with the lowest initial purchase price that meets the performance criteria of the project. An engineer will specify a "design point" (flow and pressure condition) with a minimum efficiency based on a review of several candidate pumps that essentially describes the performance criteria. The "design point" frequently reflects flow and pressure under the most severe pumping conditions, which will occur infrequently during the life of the pump station. In contrast, the life-cycle procurement approach used for the SDS pumping equipment evaluated the initial purchase price along with the expected hydraulic conditions and weighed the value of each condition based on the expected frequency of occurrence. An effective LCC procurement strategy depends on an accurate forecast of future operational conditions. For the SDS, this forecast required close collaboration of SDS program staff with Colorado Springs Utilities' operations, engineering, and water resources staff. This close collaboration resulted in a detailed planning document known as the basis of operations (BOO), which included 30 years of monthly average day flow projections (360 data points) for the SDS system. An effective LCC procurement strategy also depends on procurement documents that are easy for a pump manufacturer to understand. Some manufacturers may be hesitant to respond to an overly complicated procurement package, which can reduce competition and potentially increase price. This paper will describe the unique procedures used to forecast future operational conditions, distill those conditions down to a discrete set of representative conditions, and evaluate candidate pump manufacturers' performance against those conditions to identify the equipment that represents the best value.
Life-Cycle Procurement of Pumping Equipment for a 50,000 Horsepower Raw Water Supply System: The Southern Delivery System
Energy efficiency is a critical consideration for all water infrastructure projects. This is especially true for large water transmission pumping systems in which the energy costs over the life of the installed equipment can be as much as five times that of the initial purchase price. Colorado Springs Utilities is currently constructing the Southern Delivery System (SDS) project, which includes more than 50 mi of water transmission pipeline, three large raw water pump stations, and a water treatment plant (WTP). To minimize life-cycle costs (LCCs), the pumps, motors, and variable frequency drives (VFDs) were procured using a unique LCC procurement strategy. Pumping equipment typically is procured by selecting the pump with the lowest initial purchase price that meets the performance criteria of the project. An engineer will specify a "design point" (flow and pressure condition) with a minimum efficiency based on a review of several candidate pumps that essentially describes the performance criteria. The "design point" frequently reflects flow and pressure under the most severe pumping conditions, which will occur infrequently during the life of the pump station. In contrast, the life-cycle procurement approach used for the SDS pumping equipment evaluated the initial purchase price along with the expected hydraulic conditions and weighed the value of each condition based on the expected frequency of occurrence. An effective LCC procurement strategy depends on an accurate forecast of future operational conditions. For the SDS, this forecast required close collaboration of SDS program staff with Colorado Springs Utilities' operations, engineering, and water resources staff. This close collaboration resulted in a detailed planning document known as the basis of operations (BOO), which included 30 years of monthly average day flow projections (360 data points) for the SDS system. An effective LCC procurement strategy also depends on procurement documents that are easy for a pump manufacturer to understand. Some manufacturers may be hesitant to respond to an overly complicated procurement package, which can reduce competition and potentially increase price. This paper will describe the unique procedures used to forecast future operational conditions, distill those conditions down to a discrete set of representative conditions, and evaluate candidate pump manufacturers' performance against those conditions to identify the equipment that represents the best value.
Life-Cycle Procurement of Pumping Equipment for a 50,000 Horsepower Raw Water Supply System: The Southern Delivery System
Duling, Steve (author) / Hardison, Jay (author) / Olds, Kirk (author) / Schultz, Matthew (author) / Ott, Christopher (author) / Allen, Mark (author)
Pipelines 2014 ; 2014 ; Portland, Oregon
Pipelines 2014 ; 2257-2269
2014-07-30
Conference paper
Electronic Resource
English
Engineering Index Backfile | 1947
Nomogram determines horsepower for hot water pumps
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