Filipino Seafarers Deck And Engine Ratings

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How To Calculate Fresh Water Allowance

FWA = W / 40 x TPI (English System)

FWA = W / 4 x TPC (Metric System)

How To Calculate Dock Water Allowance

DWA = Fresh Water Allowance x (1025 – Density of Dock Water ) / 25

How To Calculate Parallel Sinkage

PS = w / TPI  (English System)
PS = w / TPC  (Metric System

w = weight loaded

How To Calculate Parallel Rise

PR = w / TPI  (English System)

PR = w / TPC (Metric System)

w = weight discharged

How To Calculate Squat

Squat / Sinkage

Open Waters:

S = Cb x  v² / 100 (Metric System)

S = Cb x v² / 30 (English System)

Shallow Waters:

Sinkage/Squat in Open  Waters x 2
 

S = (Cb x  v² / 100) x 2 (Metric System)

S = (Cb x v² / 30) x 2 (English System)

V = Ship’s Speed

Cb = Block Coefficient