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Utilities Bridging Strategy - Coggle Diagram
Utilities Bridging Strategy
Objectives & Strategy
Objectives
2) Modular, relocatable solutions (skids, packaged plants, gensets, tanks).
3) Minimal rework during switchover (valve cutover, MCC changeover, soft switchgear transfers).
4) Compliance with KSA Civil Defense, SEC, NWC, RC codes
1) Parallel alignment with permanent design (temporary tie-in points matching future permanent interfaces).
Strategy
Early Interface Definition:
Fix all temporary tie-in points at the same location where permanent PPP supply will connect.
Quality Management:
Ensure water is potable, electrical protection settings are aligned, sewerage is treated to spec, avoids re-cleaning/re-testing.
Phased Load Approach:
Scale temporary systems based on project phasing (e.g., modular STPs, scalable gensets).
Redundancy & Reliability:
Backup gensets, dual pumps on water systems, secondary storage to avoid delays.
Handover Plan:
Document all temporary systems, with clear cutover sequence and isolation diagrams for PPP contractor.
Regulatory Approvals:
Liaise with SEC, NWC, Civil Defense to ensure temporary systems are approved and will not invalidate final approvals
Approach & Challenges
Portable Water
Approach
Distribution:
Connect to permanent potable water ring via temporary manifolds and isolation valves at agreed tie-in points.
Commissioning Readiness:
Maintain potable quality (daily lab checks) to prevent re-cleaning of pipes when permanent supply is connected
Transfer Strategy:
Permanent PPP main ties into the same buffer tank or manifold. Temporary supply disconnected with no re-flushing required (if water quality is maintained)
Temporary Source:
Mobile RO plant or tanker deliveries to temporary buffer tanks (with chlorination dosing skid).
Challenges
Design & Engineering
Can temporary tanks and pipework be tied into the permanent ring without re-routing?
How will temporary chlorination and dosing integrate with permanent SCADA/BMS controls?
Are pressure zones in the temporary system aligned with final design (avoid over/under-pressurizing)?
Constructability
Are isolation chambers sized for temporary tie-in points?
Can tanker access and filling points be maintained without disrupting future works?
Environment
Risk of tanker discharge near marine zones — how to avoid leaks/spillage?
Can RO brine discharge from temporary plants be managed in line with environmental permits?
Space Requirements
Is there room for temporary buffer tanks (often large footprint)?
Can tanks/skids be located near permanent infrastructure to avoid long runs?
Maintenance
Daily water quality monitoring — is there lab/testing capacity?
Will temporary pumps/dosing require full-time operator presence?
Other considerations
Who certifies temporary water as potable (NWC approval required)?
Do temporary lines risk “dead legs” that encourage microbial growth before switchover?
Irrigation
Approach
Pump Skids:
Containerized, VFD-controlled pumps for irrigation pressure requirements.
Distribution:
Use the permanent irrigation network for testing (fill, flush, operate) to avoid repeat flushing later.
Transfer Strategy:
Permanent PPP supply connects at tank inlet, replacing temporary. No duplication of testing/commissioning if pipework is kept charged and flushed periodically.
Temporary Source:
Tanker-supplied or temporary RO plant, dedicated irrigation storage tanks (separate from potable).
Challenges
Design & Engineering
Is temporary irrigation water quality (TDS, salinity) acceptable for turf and landscaping?
Can temporary pumps maintain the same head/flow curves as the permanent irrigation design?
Constructability / Buildability
Can temporary tanks/pump skids be located adjacent to permanent irrigation tanks?
Are temporary pipelines routed to avoid crossing/obstructing golf course landscaping?
Environment (Marine)
If brackish water or RO brine is used, how is reject water managed without harming coastal ecosystems?
Space Requirements
Large tanks/pump skids may conflict with final golf course landscape features — are temporary areas allocated?
Maintenance
Irrigation pumps require regular inspection — do O&M teams have spares?
Other Considerations
Does early landscape irrigation risk waterlogging soils before proper drainage is functional?
Will temporary irrigation affect final turf/plant establishment quality (different chemistry)?
Sewage
Approach
Connect to permanent sewer network at temporary diversion chambers (with bypass lines for later redirection to PPP STP).
Effluent reuse possible for construction irrigation if quality standards met.
Transfer Strategy: Once PPP STP is commissioned, flows are redirected from temporary package STP to permanent inlet chamber. Package plant decommissioned, with no re-commissioning needed on the sewer network.
Temporary Package STP (modular skid-mounted units sized for phased demand).
Challenges
Design & Engineering
Can modular STP units be tied into permanent sewer manholes via bypass/diversion chambers without rework?
How is hydraulic balance maintained? Will temporary flows disrupt design loading of permanent STP later?
Are temporary package plants designed to same effluent quality as PPP STP (for reuse in irrigation)?
Constructability / Buildability
Are temporary discharge lines accessible for tankers if bypassing is needed?
Will excavation for tie-ins delay permanent chamber construction?
Environment (Marine)
Where is effluent discharged during temporary operations (reuse, soakaways, marine discharge)?
Are sludge handling and trucking routes safe near marine-sensitive areas?
Space Requirements
Package STP requires space + buffer tanks. Is there land allocated that doesn’t overlap with permanent STP?
Maintenance
Package STP is operator intensive, Is there an interim O&M contract in place during this time?
Other considerations
Who will issue environmental permits for temporary STP?
Risk of public health issues if temporary system underperforms.
Medium Voltage (MV)
Approach
Ring Configuration: Energize portions of the permanent MV ring progressively, matching T&C schedule.
Protection & Control: Align relay settings and SCADA integration from the start, so commissioning is not repeated.
Transfer Strategy: Once PPP supply is live, perform planned cold changeover at MV switchgear. Temporary generators disconnected without disturbing downstream LV/MV systems (already tested).
Temporary MV Generators (sized per phase demand) with step-up transformers feed into selected MV ring locations.
Challenges
Design & Engineering
Can temporary MV gensets be synchronized with permanent switchgear without damaging relays?
Will cable routing for temporary feeds obstruct or duplicate permanent trenches?
Protection coordination — are temporary settings aligned with permanent SCADA?
Constructability / Buildability
Are access routes suitable for large genset delivery and fuel trucks?
Are temporary MV connections safe within confined substation spaces?
Environment (Marine)
Genset noise/vibration near resort/eco-sensitive areas — will acoustic treatment be required?
Diesel storage near marine zones — spill prevention and containment strategy?
Space requirements
Gensets + fuel tanks take large footprint — do sites/substations have allocated laydown space?
Maintenance
Gensets require 24/7 monitoring, refuelling, oil checks. Who will maintain them until cutover?
Other Considerations
Fuel logistics (secure and continuous supply chain in remote island setting).
Fire Life Safety approvals for diesel storage near guest areas.
Low Voltage (LV)
Approach
Synchronization panels to allow parallel operation if required.
Critical systems (FLS, pumps, controls) tested on stable LV power to avoid re-commissioning.
Transfer Strategy: Permanent LV feeders from MV substations cut in at MDBs. Temporary gensets removed, with minimal or no re-testing of downstream loads
Temporary LV Generators feeding main LV switchboards or directly into MDBs.
Challenges
Design & Engineering
Can LV gensets feed MDBs without compromising permanent switchgear busbar ratings?
Are ATS/synchronization panels compatible with permanent LV switchgear?
Will temporary grounding/earthing arrangements match final earthing grid?
Constructability / Buildability
Are cable runs between gensets and MDBs short and safe?
Can temporary gensets be placed near hotels/villas without disturbing construction?
Environment (Marine)
Risk of fuel leakage in landscaped/marine-sensitive areas?
Space requirements
Containerized gensets can be bulky — is there staging space that doesn’t clash with final landscaping?
Maintenance
LV gensets need frequent servicing (oil, filters, fuel polish) — is maintenance access guaranteed?
Other Considerations
Safety — will temporary cabling meet Civil Defense inspection standards?