The field problem
Engineering Value Study for Earthing System at Ain Sokhna Port
background / original proposal
Location: Ain Sokhna Port. The consultant proposed approximately 3 m soil replacement around buildings and stainless-steel earthing rods instead of copper-bonded steel rods, principally because the site was coastal.
pis engineering investigation
PIS reassessed the proposal using soil investigation results, soil analysis, pH, actual corrosion characteristics, operating environment and material-selection criteria. The study indicated that the soil was not sufficiently aggressive to mandate stainless steel, and there was no engineering justification for complete soil replacement.
Why it failed
PIS Engineering Investigation
PIS reassessed the proposal using soil investigation results, soil analysis, pH, actual corrosion characteristics, operating environment and material-selection criteria. The study indicated that the soil was not sufficiently aggressive to mandate stainless steel, and there was no engineering justification for complete soil replacement.
Follow the engineering
Switch between the field condition and the engineering concept. Trace the path and examine what changes.
Inspect the engineering detail
What changes
Base material selection on measured soil corrosivity and documented evidence including pH, resistivity, chlorides, sulfates, moisture and operating conditions.
Correction & verification
Retain the natural soil; use appropriately specified copper-bonded steel rods; complete the network to design and verify after installation. According to the supplied case record, the approach maintained required performance and saved approximately one third of the earthing-system cost.
Verification recorded in the case
- Record as-built topology and connection points.
- Repeat the measurement or functional test under a defined condition.
- Confirm continuity and mechanical integrity of the corrected path.
- Document instrument/setup, environmental condition and test method.
- Close the case only when evidence supports the conclusion.
References & project context
References are reproduced from the PIS casebook. Select the governing edition and project acceptance criteria before using them for a design. The diagrams explain the concept, rather than define construction dimensions.
Apply the contract-specified IEC/IEEE/NFPA/local framework relevant to the actual project scope. Verify exact editions and clauses before external publication.
PIS reviewed field handbook · PIS-CS-022
View the original social cardThe engineering lesson
A coastal location does not automatically require stainless-steel electrodes or soil replacement. Material selection must be based on measured soil corrosivity - not assumptions.
Value engineering is eliminating unnecessary cost through engineering evidence, not reducing quality.
Take the lesson into your next design review.