Carreyette method

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Carreyette Method

The Carreyette method is way of estimating vessel build costs during the preliminary design stages. Although the method was developed in 1977, it still finds use today. The constants that the method takes in can be derived based on shipyard efficiency levels and current labour and materials prices.

Contents

Outline of Methodology

The following costs are calculated and combined to derive a final initial build cost:

Steel Manhours

Labour Cost

  • ws = Average hourly wage of steelworkers.
  • Hs = Steel manhour consumption.
  • CSL = Steel labour cost.

Machinery Installation Cost

  • CML = Machinery installation labour cost.
  • wm = Average hourly wage of machinery trades.
  • F = Shipyard productivity in machinery.
  • P = Service propulsive power.

Outfitting Labour Cost

  • COL = Outfitting labour cost.
  • wo = Average hourly wage of outfitting trades.
  • Wo = Outfit mass, in tonnes.

Steel Material Cost

  • CSM = Steel material cost.
  • S = Average steel price, per tonne.
  • Ws = Net steel mass, tonnes.
  • rs = Steel scrap rate.

Machinery Plant Material Cost

  • CMM = Machinery material cost.
  • G = Machinery cost constant.
  • P = Service propulsive power.

Outfit Material Cost

  • COM = Outfit material cost.
  • D = Outfit cost constant.

Vessel Cost

  • CT = Total cost of vessel

Vessel Price

  • rp = Shipyard profit rate

References

Carreyette, J. (1977).Preliminary Ship Cost Estimation. Royal Institute of Naval Architects 119:235-258

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