Sometimes it is very important to get clear and correct reminder of draught survey calculations.

Draught survey calculation sequence with explanation of steps

Draught survey calculation sequence with explanation of steps

Sometimes it is very important to get clear and correct reminder of draught survey calculations. Here is one of them:

ARRIVAL DEPARTURE LINE
DATE & TIME * 1
FORD AFT MID FORD AFT MID
OBSERVED DRAFT : PORT 12.54 12.54 12.57 * 2
STBD 12.37 12.35 12.29 * 3
MEAN 12.455 12.445 12.43 4
APPARENT TRIM -0.01 5
DISTANCE FROM PERPENDICULARS -11.558 12.90 + 6
LENGTH BETWEEN MARKS 191.54 7
DRAFT MARK CORRECTION 0.001 -0.001 0 8
TRUE DRAFT 12.456 12.444 12.43 9
TRUE TRIM -0.012 10
TRUE MEAN DRAFT (TMD) 12.45 11
OBSERVED DENSITY 1.0155 *12
SCALE DENSITY 1.025 +13
T.P.C. AT MID PORT 64.57 +14
T.P.C. AT MID STBD 64.37 +15
T.P.C. AT TRUE MEAN DRAFT 64.475 +16
L.C.F. 0.605 +17
L.B.P. 216 +18
M.T.C.@ T.M.D. + 50 cm 989.31 +19
M.T.C. @ T.M.D. - 50 cm 958.49 +20
DISPLACEMENT @ T.M.D. 73908.5 +21
1ST TRIM CORRECTION -0.217 22
2ND TRIM CORRECTION 0.001 23
LIST CORRECTION - 24
DISPLACEMENT AT EVEN KEEL 73908.28 25
TRUE DISPLACEMENT 73255.22 26
BALLAST 196 *27
FUEL OIL 1562 *28
DIESEL OIL 86.7 *29
LUB OIL - *30
FRESH WATER 266 *31
STORES 0 *32
MISC (const) 230 *33
MISC (light ship) 9558 *34
TOTAL DEDUCTABLES 2110.7 35
NET DISPLACEMENT 71177.52 36
CARGO LOADED/DISCHARGED 61356 37

EXPLANATION OF LINES:- * = OBTAINED BY OBSERVATION + = OBTAINED FROM SHIPS APPROVED STABILITY AND CALIBRATION TABLES ALL OTHERS OBTAINED BY CALCULATION AS FOLLOWS.

L4 = L2 + L3 L5 = L4 (aft) - L4 (ford) {STERN TRIM IS POSITIVE} L6 IF NOT IN SHIPS TABLES CAN BE ESTIMATED BY OBS

2 NAMED NEGATIVE IF PERPENDICULAR IS FORD OF MARKS

L7 = L18 + L6 (aft) - L6 (ford) { REMEMBER THAT A NEGATIVE MULTIPLIED BY A NEGATIVE RESULTS IN A POSITIVE }

L8 = L5 x L6 L9 = L4 + L8 L10 = L9 (aft) - L9 (ford) L11 = (6 x L9 mid ) + (L9 aft) + (L9 ford)

L7 8

L17 LCF IS USUALLY MEASURED FROM MIDSHIPS. IT IS USUAL TO NAME LCF AS NEGATIVE IF IT IS FORD OF MIDSHIPS, ON SOME SHIPS THE DATA IS LISTED WITH POSITIVE MEANING FORD OF AMIDSHIPS. THE OFFICER SHOULD ENSURE HE IS FAMILIAR WITH THE SYSTEM. IF IT IS GIVEN FROM THE AFT PERP THEN APPLY LBP/2

L22 = L16 x L17 X L10 x 100 L23 = (L19 » L20) x L10 x L10 x 50 (CORRECTION IS ALWAYS + ) L24 = (L9port » L9 stbd) x (L14 » L15) x 6

L18 L18

L25 = L21 + L22 + L23 + L24 L26 = L25 x L12 L35 = L27+L28+L29+L30+L31+L32+L33+L34 L36 = L26 - L35 L37 = L36arr » L36 dep

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