Hull Steel Wastage, UT Thickness, Renewal Tonnage & Drydock Repair Cost Tool | ShipUniverse
2011 ESP Code as amended • IACS UR Z10 Survey Logic • CSR Renewal Thickness • UT Trend • Steel Weight • Repair Scope • Drydock Budget

Hull Steel Wastage, UT Thickness, Renewal Tonnage & Drydock Repair Cost Tool

Turn ultrasonic thickness readings into a practical hull-repair plan. Screen measured steel against the class-approved renewal thickness, distinguish substantial corrosion from actual renewal, project years to the renewal limit from prior UT data, estimate crop-and-renew steel tonnage, and build a drydock cost and schedule allowance around the identified scope.

Currency
Currency selector changes display only. No exchange-rate conversion is performed.

Vessel, Survey & Acceptance Basis

Enter the class-approved renewal thickness for the actual structural member. The calculator does not derive scantlings or replace hull-girder, buckling, local-strength, fatigue or class-rule assessment.

% of allowable margin consumed. Owner planning threshold only.

Representative UT Location

mm. Use approved/as-built/reference thickness applicable to the member.
mm. The minimum relevant reading controls this screening gate.
mm at the same / comparable point.
mm. Do not substitute a generic wastage percentage.
% of area. Used as an enhanced-review marker, not as an automatic class renewal criterion.

Simple Crop & Renewal Scope

m.
m.
mm, subject to approved repair drawing / class.
m.
kg/m.
m beyond plate perimeter.

Advanced UT & Renewal Register

Each row is assessed independently. Enter the approved renewal thickness for that location and the intended crop-and-renew quantity. The tool uses the current minimum reading, not an average of different structural areas.

LocationMemberOrig mmPrev mmYearsCurrent mint₍ren₎PatternPit %Crop m²Repl mmStiff mkg/mWeld mUT pts

Steel Quantity & Scope Growth

t/m³. Standard planning value for carbon steel.
% of presently identified crop-and-renew tonnage. Allows for scope growth after cropping / close-up inspection.
% above expected installed renewal weight.
1.00 = base quoted steel cost. Use >1 for higher-strength / special sourcing.

Yard Cost Inputs

Rates are deliberately user-entered because steel, labor, access and drydock pricing vary materially by region, vessel, urgency and repair complexity.

per tonne delivered / fabricated basis selected by user.
per labor-hour.
labor-hours per installed tonne, before complexity factor.
Access, curvature, confined spaces, high-strength steel, overhead welding, inserts, staging.
per m of screened weld length.
% of direct steel labor cost.
per m² of coated surface.
2.0 approximates both sides of plate; adjust for tank internals/stiffeners.
per m² of crop area before scope growth.
% applied after the modeled repair package and incremental dock exposure.

Drydock Schedule & Dock Exposure

tonnes/day on the critical repair path.
days.
days.
days.
% of NDT / coating tail assumed to overlap other work.
Only excess modeled days create incremental dock exposure below.
per incremental day.
years, used to flag locations projected below renewal before the next planned opportunity.

Survey / Repair Readiness Checks

Structural limitation: This is a planning and repair-budget screening tool. It does not determine statutory/class scantlings, hull-girder section modulus, buckling capacity, fatigue strength, local structural adequacy, crack acceptability, insert geometry or temporary-repair acceptance. The attending class surveyor and the vessel's approved structural documentation control the renewal decision and repair detail.
Regulatory / technical basis: 2011 ESP Code as amended and the applicable IACS hull-survey Unified Requirements use renewal thickness as the minimum allowable thickness below which renewal is required. For non-CSR structures, substantial corrosion is generally the condition where more than 75% of the allowable wastage margin has been consumed while remaining within acceptable limits. For CSR ships, the ESP/IACS substantial-corrosion band is based on measured thickness between t₍ren₎ + 0.5 mm and t₍ren₎. Suspect/substantially corroded areas can trigger expanded or more frequent thickness measurements. Repair workmanship, welding, steel grade, NDT and final repair scope remain subject to the applicable classification society, approved repair procedures and vessel-specific structure.
Generated by ShipUniverse.com
By the ShipUniverse Editorial Team — About Us | Contact