search.noResults

search.searching

note.createNoteMessage

search.noResults

search.searching

orderForm.title

orderForm.productCode
orderForm.description
orderForm.quantity
orderForm.itemPrice
orderForm.price
orderForm.totalPrice
orderForm.deliveryDetails.billingAddress
orderForm.deliveryDetails.deliveryAddress
orderForm.noItems
BY CAPT REAZ SHAHID AFFIIIMS B ULK CARRIER loading operation


encompasses numerous activities involving mathematical calculation and or physical verification. However, certain exercises are purely based on calculation; physical verification is not required or not possible (BM, SF etc.) to comply with commercial and or regulatory requirement. Trimming of a bulk carrier is such an activity where expected result is calculated but physical verification is required to confirm that desired outcome has been achieved. Otherwise, it usually has serious commercial and regulatory implication especially when some restrictions are imposed on loading operation from the terminal e.g. loading operation cannot be ceased till belt is clear of cargo or minimum cargo that can be loaded is 500 MT etc. At times it turns out to be very complicated as to determine the trimming quantity through mathematical calculation solely. Successful denouement of loading operation contingent upon correct determination of trimming quantity and therefore, trimming is a very important operational activity on board a bulk carrier. Recently I had to go through some trepidation in order to ascertain cargo quantity while trimming a cape size ore carrier fitted with 6 cargo holds and this article is predicated upon it. During the intermediate draft survey before trimming, we noticed about 8.4 cm hog as shown.


50 | The Report • March 2017 • Issue 79


DRAFT BEFORE TRIMMING: Observed draft


Port


Ford Aft


Mid


17.90 18.07 17.92


Stbd


17.85 17.98 17.82


Mean 17.875 18.025 17.870


Hog(-) / Sag(+) -0.084 m FIGURE 1


As per original loading plan, cargo hold no.6 & 2 was assigned for trimming of the vessel and maximum sailing draft (MSD) applicable for the vessel was 18.33 m, i.e. any of the three drafts


TRIMMING CALCULATION: Max Draft 18.330


Summer/mid F & A Draft 1/4 Mean


18.330 18.330 18.330


(Forward, Aft & Midship) should be maximum of 18.33 m. Based on calculation shown below (calculated using trimming table), anyone would have decided to load 6300 MT to reach MSD of 18.33m.


Balance to go 7705 6298 7354


Cargo Requirement 6300 Fwd Mid # Aft # Fwd # 0 No.4 2486 No.6 3814 No.2 Aft 0.000 Mid


17.871 18.037 17.870 0.000


0.000


17.871 18.037 17.870 -0.149


0.447 -0.153 0.148


17.722 18.484 18.018 0.610


0.228 18.332 18.331 18.246 FIGURE 2 -0.001 0.762 0.166 Trim 0.166


LBP 318.000 LBM 288.000


Corrected Draft


F Perp draft A Perp draft


17.871 18.037


Mid corrected 17.870


Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40  |  Page 41  |  Page 42  |  Page 43  |  Page 44  |  Page 45  |  Page 46  |  Page 47  |  Page 48  |  Page 49  |  Page 50  |  Page 51  |  Page 52  |  Page 53  |  Page 54  |  Page 55  |  Page 56  |  Page 57  |  Page 58  |  Page 59  |  Page 60  |  Page 61  |  Page 62  |  Page 63  |  Page 64  |  Page 65  |  Page 66  |  Page 67  |  Page 68  |  Page 69  |  Page 70  |  Page 71  |  Page 72  |  Page 73  |  Page 74  |  Page 75  |  Page 76