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DSRSD – WWTP
SCADA System Design
WBA developed the design documents to replace the District’s
existing main control panel with a SCADA system. To ensure that
a qualified system integrator was retained to install the SCADA
system, WBA developed and managed an RFP process to award the project.
The RFP selection criteria were based on qualifications in addition
to price so that the District was not obligated to select the system
integrator with the lowest price. The design documents were developed
to use design-build strategies where appropriate to primarily take
advantage of the knowledge of the system integrator, and to minimize
risk to the District. The key design elements included defining
the number and location of the PLCs and HMIs, the HMI and PLC network
design, the number and location of over 700 I/O points, the description
of the control strategies, description of the SCADA screens, defining
the reuse of existing conduits and the installation of new conduits,
and the sequencing plan to minimize disruption of operations during
the installation of the SCADA system.
DSRSD – WWTP
SCADA System Installation Management
WBA managed the contract with the system integrator, Control Manufacturing
Company (CMC), to replace the existing main control panel with
a SCADA system. Tasks included shop drawing review, review of the
SCADA system screens, witnessing the system factory test, management
of communications with the system integrator, negotiation of change
orders, observation of the system installation, review and coordination
of system cutover plans, monitoring of field testing of the system,
assistance with system start-up, training of District staff, and
reviewing progress payment requests.
DSRSD – Stage
4 Expansion SCADA System Installation Management
The existing WWTP SCADA system needed to be modified as part of
the Stage 4 WWTP expansion project for DSRSD. Because of the success
of the initial installation of the WWTP SCADA system, the District
selected WBA to manage a separate contract with the same system
integrator (CMC) to modify the SCADA system. WBA also developed
a contract and negotiated a fee with CMC to complete the necessary
SCADA modifications. For the installation management phase, tasks
for WBA included shop drawing review, review of the SCADA system
screens, witnessing the system factory test, management of communications
with the system integrator, negotiation of change orders, observation
of the system installation, review and coordination of system cutover
plans, monitoring of field testing of the system, assistance with
system start-up, and reviewing progress payment requests.
FSSD – WWTP
SCADA System
A WBA employee managed the process to design and install a SCADA
system to replace the Fairfield-Suisun Sewer District’s
(FSSD) plant process computer system while he was employed at
FSSD as the engineering and operations manager. An RFP process
was developed and used to primarily allow the District to account
for technical qualifications in selecting a contractor for the
project, and to save time and money. The RFP contained the criteria
for reviewing proposals, and the technical requirements for the
project, which required the contractor to design, furnish, and
install all items to make a complete and operable system. The
technical requirements consisted of a blend of performance specifications
and detailed specifications. The scope of work generally consisted
of furnishing, installing, and programming PLCs and HMIs, a new
fiber optic cable system to network PLCs and the HMIs, wiring
as needed to connect the I/O points to the PLCs, and a new SCADA
software package. The contractor also had to design, plan, and
schedule the work to minimize interference with the operation
of the existing plant process computer system.
DSRS – Water
System SCADA Expansion Design and Installation Management
WBA designed and managed the installation of the SCADA System Expansion
based on the SCADA System Master Plan completed by WBA. The projects
included installation of data concentrators for water and recycled
water facilities in Eastern Dublin and Dougherty Valley. The
data concentrators communicate with their applicable facilities
using 900 MHZ spread spectrum radios. The data concentrators
are responsible for sending and transmitting control signals
for their facilities so that if communications with the central
site failed, control signal communications would be maintained.
Modifications at the central site to improve system reliability
will include installation of an ethernet network, an additional
HMI as a back-up, and a UPS system. The SCADA screens will also
be modified to improve monitoring and control.
The above projects are representative of our experience in this area.
If you
would like additional information on these, or other projects that
we
have completed, please contact us.
For detailed descriptions
of representative projects in our other areas of expertise,
click below on the category you are interested in:
Recycled Water:
Wastewater:
Water Supply:
Specialized
Areas:
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