Section 18 - Equipment A, B 18 - 1
Section 18
Equipment
A. General 5. When determining the equipment for tugs, Section
27, E. is to be observed.
1. The equipment of anchors. chain cables, wires and When determining the equipment of barges and pontoons,
ropes is to be determined from Table 18.2 in accordance Section 31, G. is to be observed.
with the equipment numeral Z1 or Z2, respectively.
6. Ships built under survey of BKI and which are to
Note have the mark • •stated in their Certificate and in the Register
Book must be equipped with anchors and chain cables
The anchoring equipment required by this Section is intended complying with the Rules for Materials, Volume V, and
of temporary mooring of a vessel within a harbour or having been tested on approved machines in the presence
sheltered area when the vessel is awaiting berth, tide, etc. of Surveyor.
The equipment is, therefore, not designed to hold a ship 7. For ships having three or more propellers, a reduction
off fully exposed coasts in rough weather or to stop a ship of the weight of the bower anchors and the chain cables may
which is moving or drifting. In this condition the loads on be considered.
the anchoring equipment increase to such a degree that
its components may be damaged or lost owing to the high
energy forces generated, particularly in large ships.
B. Equipment Numeral
The anchoring equipment required by this Section is designed
to hold a ship in good holding ground in conditions such
as to avoid dragging of the anchor. In poor holding ground 1. The equipment numeral Z1 for anchors and chain
the holding power of the anchors will be significantly cables is to be calculated as follows:
reduced.
The equipment numeral formula for anchoring equipment Z1 =
required under this Section is based on an assumed current
speed of 2,5 m/sec, wind speed of 25 m/sec and a scope of
D = moulded displacement [ton] (in sea water having
chain cable between 6 and 10, the scope being the ratio
a density of 1,025 t/m3) to the summer load
between length of chain paid out and water depth.
waterline
It is assumed that under normal circumstances a ship will h = effective height from the summer load waterline
use only one bow anchor and chain cable at a time. to the top of the uppermost house
2. Every ship is to be equipped with at least one anchor = a + • •hi
windlass.
a = distance [m], from the summer load water-line,
Windlass and chain stopper, if fitted, are to comply with amidships, to the upper deck at side
Rules for Machinery Installations, Volume III, Section 14,D.
A = area [m2], in profile view of the hull,
superstructures and houses, having a breadth
For the substructures of windlasses and chain stoppers, see
greater than B/4, above the summer load
Section 10, B.5.
waterline within the length L and up to the
height h
For the location of windlasses on tankers, see Section 24,
A.9. • •hi = sum of height [m] of superstructures and
deckhouses, measured on the centreline of each
3. For ships having the navigation Notation "L" tier having a breadth greater than B/4. Deck
(Coasting Service) affixed to their Character of Classi- sheer, if any, is to be ignored. For the lowest tier,
fication, the equipment may be determined as for one "h" is to be measured at centreline from the upper
numeral range lower than required in accordance with the deck or from a notional deck line where there
equipment numeral Z1 or Z2, respectively. is local discontinuity in the upper deck.
4. When determining the equipment for ships having Where a deckhouse having a breadth greater than B/4 is
the navigation notation "T" (Sheltered Shallow Water located above a deckhouse having a breadth of B/4 or less,
Service) affixed to their Character of Classification, the the wide house is to be included and the narrow house
provisions of Section 30, E. are to be observed. ignored.
