A steel-renewal offer can look precise while leaving its quantity basis unresolved. One offer may count installed plate weight; another may include a different allowance for fabrication, removal or supporting work. A lower unit rate is not automatically a lower comparable cost. Ship steel renewal quantity measurement should therefore be agreed before the owner treats two offers as equivalent.

This guide concerns the commercial measurement record, not the engineering decision to renew structure. For the initial location and defect brief, use the separate hull steel renewal scope guide.

1. Identify what each quantity represents

Give each repair location a stable item number linked to a drawing, marked photograph or sketch. Record the structural component, proposed material specification, dimensions and current status. Distinguish an enquiry estimate from a quantity measured after opening up and from the final agreed quantity. A total without those distinctions is difficult to audit.

Do not use a thickness measurement alone as a renewal instruction. The extent of renewal, material selection and any class involvement require the applicable vessel-specific technical process. Keep that approval trail separate from the commercial calculation, then cross-reference the approved repair definition.

2. State the measurement rule beside the unit rate

Ask what the quoted unit includes and how it will be calculated. Is plate quantity based on an agreed geometric calculation, a defined material record or another contractually accepted method? How are profiles, brackets, curved pieces and partial renewals treated? Record the method rather than assuming that every yard uses the same convention.

  • Quantity unit and calculation method.
  • Dimensions and material data used in the calculation.
  • Treatment of cut-outs, offcuts, waste and temporary material.
  • Separate measurement rules for different structural components.
  • Who measures, who checks and when the quantity becomes agreed.

No universal waste percentage or deduction rule is proposed here. Those terms belong in the actual offer and agreement.

3. Separate steel quantity from enabling work

Access, staging, insulation removal, cleaning, local coating work, temporary support and reinstatement can affect the job without being represented by installed steel quantity. Ask whether each is included, excluded or priced separately. Otherwise the same apparent unit rate can describe substantially different obligations.

Use a short responsibility matrix for owner supply, yard supply, inspection coordination and disposal. This supports price transparency without implying that the cheapest quoted rate gives the best overall result. Any comparison should use the same boundaries and the same known technical information.

4. Keep a joint measurement trail

Plan measurement checkpoints before affected areas become inaccessible. A practical record can show item number, location, drawing revision, measured dimensions, calculation reference, date and the parties recording agreement. Attach photographs with enough context to identify the location; a close-up without orientation may be insufficient.

Keep proposed, checked and agreed values in separate fields. If the owner representative cannot attend, agree what evidence can support remote review and which decisions still require attendance. A photo acknowledgement is not necessarily technical acceptance or commercial agreement.

5. Control quantity changes without hiding uncertainty

When additional deterioration is exposed, open a revision against the original item. Explain what changed, why the original estimate no longer applies, what evidence is available and what decision is required. Do not silently replace the enquiry quantity with a final figure.

A useful clarification question

“Please confirm the measurement basis for item SR-04, the supporting drawing revision and whether access and local reinstatement are included.” This asks for comparable information without asserting an unverified repair quantity or prescribing a technical solution.

6. Reconcile the final quantity and handover record

At close-out, reconcile the approved scope, changes, measured quantities and invoice references. Keep unresolved differences visible. A reliable file lets the technical and purchasing teams trace a commercial amount back to the agreed repair item, rather than relying on a spreadsheet total detached from the work.

For an enquiry involving steel and structural works, prepare the item register, available drawings and proposed measurement rules. Contact Gisan Shipyard to discuss the vessel-specific scope and clarify what information is needed for an offer.