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Water System Water System Design -Design -
The Role of O&M The Role of O&M StaffStaffCheryl CapronCheryl Capron
Seattle Public UtilitiesSeattle Public Utilities
Why Include Operators Why Include Operators and Maintenance Staff?and Maintenance Staff?
Incorporating their knowledge Incorporating their knowledge makes a project more successful. makes a project more successful.
Better integration of project with existing Better integration of project with existing systemsystem
Reduces the amount of work re-done by O&M Reduces the amount of work re-done by O&M staff once project is closedstaff once project is closed
Potential reduction in CIP & O&M costsPotential reduction in CIP & O&M costs
What Kind of O&M Staff?What Kind of O&M Staff? System KnowledgeSystem Knowledge Detail-Oriented Detail-Oriented
Ones who notice subtle Ones who notice subtle changes or changes or discrepancies in datadiscrepancies in data
InquisitiveInquisitive Ones who ask whyOnes who ask why
Analytical & PersistentAnalytical & Persistent Ones who figure out Ones who figure out
whywhy Bill Bill NyeNye
What Should What Should They Know They Know
About?About?
Infrastructure Infrastructure TroubleTrouble SpotsSpots
That’s pretty soggy ground for a flex That’s pretty soggy ground for a flex coupling…coupling…
We need another isolation valve; that one’s We need another isolation valve; that one’s awfully close to the excavation zone.awfully close to the excavation zone.
That 80-year-old valve hung up last week at That 80-year-old valve hung up last week at 30% open...30% open...
Infrastructure Infrastructure TroubleTrouble SpotsSpots
It’s 80 psi down there and most of It’s 80 psi down there and most of those gate valves leak – we should those gate valves leak – we should replace them when we reline…..replace them when we reline…..
O&M Practices & HistoryO&M Practices & History
Why this way?Why this way? Staffing levels Staffing levels How long it takesHow long it takes ConstraintsConstraints
• Why it’s done• How it’s done
Instrumentation & Instrumentation & Control NeedsControl Needs
Identify desired level of I&C and Identify desired level of I&C and automationautomation
Identify what’s appropriate for the Identify what’s appropriate for the operator’s level of accountabilityoperator’s level of accountability
Ed Harris as Gene Ed Harris as Gene Kranz in Kranz in Apollo 13Apollo 13
System Water QualitySystem Water Quality
Knows normal and seasonal Knows normal and seasonal variationsvariations
Good, bad
or normal?
System Water QualitySystem Water Quality
Can identify probable impacts of Can identify probable impacts of events or changes in operationevents or changes in operation
Four impacts that can result from high velocities are...
Their PerspectiveTheir Perspective
How Will It Work?How Will It Work?
Will the design Will the design allow the project to allow the project to function as function as required?required?
How will the How will the project change the project change the way my system way my system operates? Is that operates? Is that acceptable?acceptable?
To bring it on To bring it on lineline
To operate itTo operate it To maintain itTo maintain it
What Will It Take to What Will It Take to Make It Work?Make It Work?
What Happens With Pieces Out What Happens With Pieces Out For O&M?For O&M?
• An automated pump station starts when pressure drops below 90 psi. The gauge needs to be replaced. It is isolated, causing the input to the PLC to drop out. Does the PLC
1) interpret the missing point as a valid reading <90 psi & start a pump?
2) flag the data as invalid and hold last valid status?
3) have a manual over-ride or bypass mode?
Worst-Case ScenarioWorst-Case Scenario
What could go What could go wrong? wrong?
How hard would it How hard would it be to rectify? be to rectify?
How long will it How long will it take?take?
Is it even a big deal?Is it even a big deal?
What Can O&M What Can O&M StaffStaff
Do For You? Do For You?
Pre-DesignPre-Design
Functional Requirements AnalysisFunctional Requirements Analysis For the projectFor the project For system during constructionFor system during construction For start-up & commissioningFor start-up & commissioning For O&M For O&M
Pre-DesignPre-Design
Draft shutdown & start-up plansDraft shutdown & start-up plans
Draft a pressure zone or system Draft a pressure zone or system operating plan for the construction operating plan for the construction periodperiod Identify bypass needs & constraints Identify bypass needs & constraints
imposed by the loss of the facilityimposed by the loss of the facility Identify major system maintenance that Identify major system maintenance that
should be done prior to NTPshould be done prior to NTP
Ethyl Tank
SinclairReservoir
Hess PS2 pumps @ 5500 gpm each
Richfield PS2 pumps @ 6000
gpm each
WeSaySo Water CompanyIntermediate Service Area Schematic
(Not To Scale) Base
Jura
ssic
Blv
d
Permian St.
Tria
ssic
Blv
d
Mesozoic St.
Pal
eozo
ic B
lvd
Cre
tace
ous
Way
1.0 MGAltitude Valve
10 MG
Zone Base MapZone Base Map BoundariesBoundaries StorageStorage SupplySupply Major FeedersMajor Feeders Shut Down Shut Down
ValvesValves PrimaryPrimary BackupBackup
Ethyl Tank
SinclairReservoir
Hess PS2 pumps @ 5500 gpm each
Richfield PS2 pumps @ 6000
gpm each
WeSaySo Water CompanyIntermediate Service Area Schematic
(Not To Scale) Inlet 2
Zone Map for Zone Map for Backup Inlet Backup Inlet ShutdownShutdown
South end isolated, South end isolated, needs new relief needs new relief pointpoint
South end PS has South end PS has reduced service reduced service area, throttling area, throttling capability on capability on discharge neededdischarge needed
4" Blowoff
Pipe Size & Length Volume in Gallons
30" - 817 ft(Inlet valve to blowoff)
30" - 6131 ft(Blowoff to Mesozoic St. valve)
Emergency Pump Connection
30
"
WeSaySo Water CompanyIntermediate Service Area Schematic
(Not To Scale) Inlet Dewatering
Cu
rb 6
47
8'
Curb 7386'
Curb 8374'
Curb 9370'
Curb 10351'
Curb 11316'
Inlet Invert479'
Note: No service or hydrant taps on feeder lines.
30,000
225,000
De-Watering De-Watering Identify blowoff Identify blowoff
pointspoints Calculate volumesCalculate volumes If the whole thing If the whole thing
sits for a month, can sits for a month, can I disinfect & flush I disinfect & flush the required the required volume?volume?
Requires either a short-Requires either a short-term shutdown or a new term shutdown or a new isolation valve before isolation valve before the reservoir is the reservoir is demolished.demolished.
Why Do This During Pre-Why Do This During Pre-Design?Design?
The answers to these questions will The answers to these questions will identify whether there are elements identify whether there are elements that need to be incorporated into the that need to be incorporated into the design.design. Is a new isolation valve required?Is a new isolation valve required? Are air valves, blow-offs and sample Are air valves, blow-offs and sample
points where they are needed?points where they are needed? Is a specific construction sequence Is a specific construction sequence
required?required?
Challenges of Replacement Challenges of Replacement ProjectsProjects
Capacity reduction may require bypassCapacity reduction may require bypass Connecting new to old may be difficultConnecting new to old may be difficult Old valves leak or break easilyOld valves leak or break easily Disturbing old pipe or bedding may Disturbing old pipe or bedding may
cause leakscause leaks Long, large dead ends for extended Long, large dead ends for extended
periodsperiods Flushing, disinfection, no sample pointsFlushing, disinfection, no sample points
Sequencing Multiple Sequencing Multiple ShutdownsShutdowns
Maintaining service & fire flowsMaintaining service & fire flows How many blocks to the nearest How many blocks to the nearest
hydrant?hydrant? How many streets in a row on How many streets in a row on
temporary?temporary? Diurnal & seasonal demandDiurnal & seasonal demand What happens to your shutdown if What happens to your shutdown if
you have to back up another valve?you have to back up another valve?
Pre-DesignPre-Design
Draft O&M review checklistsDraft O&M review checklists Do this early and give them to the Do this early and give them to the
designers so they know what you’ll be designers so they know what you’ll be looking for.looking for.
Design ReviewDesign Review
Include O&M staff at all stages of Include O&M staff at all stages of review.review. As design becomes more refined, their As design becomes more refined, their
review becomes more specific & focused on review becomes more specific & focused on how they will operate & maintain project.how they will operate & maintain project.
If items are deleted, include O&M staff in If items are deleted, include O&M staff in the decision-making process.the decision-making process.
Reduction in CIP $ frequently means increase in Reduction in CIP $ frequently means increase in O&M. Make sure your staff can handle what O&M. Make sure your staff can handle what you’re committing them to.you’re committing them to.
Start-up & Start-up & CommissioningCommissioning
Acceptance Testing Acceptance Testing ((NotNot the the manufacturer’s & contractor’s equipment testing manufacturer’s & contractor’s equipment testing & commissioning)& commissioning) Does the project work with your whole Does the project work with your whole
system like it’s supposed to?system like it’s supposed to?
DocumentationDocumentation Test results/findingsTest results/findings Operating proceduresOperating procedures
Post-ImplementationPost-Implementation
Go back & talk to the O&M staffGo back & talk to the O&M staff What’s working well?What’s working well? What’s been changed? Why?What’s been changed? Why? What would they do differently next What would they do differently next
time?time?
