Section 4 Sea Water and Drainage Piping System

401. General

Sufficient number of freeing ports and scuppers are to be installed on bulwarks and decks.

402. Drain pipe

1. When drain pipes are installed to discharge water from upper deck or accommodations to the be- low waterline or adjacent area, check valves or cock are to be installed and discharge lines are to have sufficient thickness.

2. For the crafts of 20 m or less in length, in case the drain pipes of upper deck is installed to dis- charged water to the above waterline, the drain pipes may be reclaimed in the side plating. The weight of drain pipe wall is not to be less than 75 % of side shell plating.

3. Drain pipes installed between decks are to be led to bilge well in crafts.

4. Sanitary supply lines and pipe lines for washbasin are to be connected to side shell plating.

5. Cast steel with check valve or other elbow, etc. are to be of strong structure and of approved ma- terial except normal cast iron. Pipes attached to valve or elbow are to be of galvanized and thick steel pipes.

403. Sea suction and overboard discharging system

1. The sea suction and overboard discharging system are to be fitted at the location which are easily accessible and valve and cocks are to be connected with shell plate or short and rigid distance piece directly. The shell openings are to be reinforced with doublers properly.

2. Where the fitting of a seacock/valve or through-hull fitting impairs the local strength of the hull, a reinforcement or a backing block is to be installed to compensate for the loss of strength.

3. In reinforced plastics hulls built in sandwich construction, the core material is to be replaced by a material that cannot be compressed when tightening the through-hull fitting, or the area around the fitting is to be built in single skin construction with local reinforcement.

4. The attachment of through-hull fittings and seacock/valve to the hull is to be watertight and so in- stalled as to prevent loosening under normal operating conditions.

5. Sea cocks/valves are to be readily accessible and securely fastened to the hull to permit easy oper-

ation without damage to the hull structure or to the sea cock/valve

the watertight integrity or the sea cock/valve installation.

6. Cocks/valves, outfitting penetrating hull are to be complied with the

and ISO 9093-2.

itself and without destroying

requirements of ISO 9093-1

404.

Bilge piping sysytem

1. Type, number and location

(1) General

Bilge-pumping systems are to be capable of removing water from all main compartments of the craft where water can accumulate. Fore and aft peaks with a combined volume of less than or including 10 % of the displacement of the craft in the fully loaded ready-for-use condition, ac-

cording to ISO 8666, compartments can be

need not be linked to the bilge-pumping system if trapped water in those emptied into the main bilges by a valve, or drained by other means.

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Types, numbers and locations of bilge-pumping systems are to be in accordance with require- ments in (2) and (3).

(2) Open and partially decked crafts(For crafts in design categories A, B C and D)

For open and partially decked crafts, the means of bailing are to be specified in the owner's manual.

(3) Fully decked crafts

(A) Fully decked crafts are to be fitted with one or more bi1ge pumps according to the require- ments in (B) and (C).

(B) Primary bilge pump (For craft in design categories A, B and C)

(a) Where the main steering position is exposed and the water head in the discharge line is less than 1.5 m, one manual bilge pump is to be installed, permanently attached to the craft structure and operable from within the cockpit, with all doors, hatches and other accesses to the interior of the craft closed;

(b) Where the main steering position is exposed and the water head in the discharge line is

1.5 m or more, one manual or powered bilge pump or bilge pumping system (e.g. elec-

tric) is to be installed, permanently attached to the craft structure and operable from the main steering position, with all doors, hatches and other accesses to the interior of the craft closed;

(c)

Where the main steering position is enclosed within the craft, one powered bilge pump or bilge-pumping system is to be installed and the bilge pump is to be operable from the main steering position.

(C) Primary bilge pump(For craft in design category D)

(a) If ÄĂ is greater than 6 m, one manual or powered bilge pump or bilge-pumping system is to be installed;

(b) If ÄĂ is less than or equal to 6 m, one manual bilge pump or other means of bailing is to be available, which is to be specified in the owner's manual.

(D) Secondary bilge pump

For craft in design categories A, B and C, one additional manual, mechanical or electric bilge pump or bilge-pumping system is to be installed, which is to be capable of removing

water from all bilge compartments and

which is to be operable

from a readily

accessible

position. For craft in design category D, no secondary bilge pump is required.

Table 8.1 Bilge pump requirements

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2. Capacity

(1) The capacity of each bilge pump, according to 1 (3) is to be not less than

(A) 10 L/min for crafts with ÄĂ , less than or equal to 6 m,

(B) 15 L/min for

(C) 30 L/min for

crafts with ÄĂ , greater than 6 m and less than 12 m, or crafts with ÄĂ , greater than or equal to 12 m.

(2) These volumes per minute are to be achieved when the pump is subjected to a back pressure

of 10 kPa. For manual bilge pumps, the capacity is to be rated for 45 strokes per minute.

3. Design and construction

(1) The design and construction of bilge-pumping systems are to withstand the pressures, temper- atures and stresses likely to be encountered under normal operating conditions. Bilge pumps are to be operable within temperature limits ranging from 0 °C to +60 °C and are to withstand stor- age temperatures, without operation, of -40 °C to +60 °C when in the dry condition.

(2) Spigots/spuds of bilge pumps and other components are to be long enough to provide support for the hose, and permit the use of clamps.

(3) Unless permanently fitted, bilge-pump handles are to be secured to minimize the risk of acci-

dental loss.

(4) No bilge pump may discharge into a cockpit unless the cockpit opens aft to the sea. Bilge pumps are not to be connected to cockpit drains.

(5) Electrically operated pumps

(A) Electric bilge pumps are to comply with ISO 8849.

(B) Electrical connections are to be water resistant to a degree of IP 67 according to IEC 60529, and are to be placed above the maximum acceptable water level, unless submersible.

(C) Where the switch is subject to spray water, it is to be water resistant to a degree of IP 56 according to IEC 60529.

(6) The inner diameter of bilge suction pipes are not to be less than that obtained from following formula. However, the inner diameter is not to be less than 25 mm in any case and the inner

diameter of bilge branch line need not be exceed 50mm.

J

ẀG Ä

ËĦË

Ğ ËÈ

Ẁ : inner diameter of bilge pipe (mm)

Ä : craft length (m)

4. Installation

(1) Bilge pumps are to be mounted in an accessible location for servicing and clearing the intake.

(2) Bilge-pump water inlets (e.g. strainers) are to be designed and installed to minimize ingestion of debris likely to cause pump failure and are to be accessible for cleaning.

(3) Intake hoses are not to collapse under maximum pump suction.

(4) Bilge-pump pipes and hoses are to be installed to minimize flow restriction.

(5) Outlets on the hull are to be above the maximum heeled waterline, unless a seacock is installed in accordance with ISO 9093, and there is a means to prevent backflow into the craft.

(6) Where several pumps discharge through one through-hull fitting, the system is to be designed so

that the operation of one pump will not feed back through another pump, and the simultaneous operation of the pumps will not diminish the pumping capacity of the system.

(7) Hose connections are to be secured with non-corrosive types of clamps, or with permanently at- tached end-fittings.

(8) Non-submersible bilge pump non-sailings are to be located above the critical bilge-water level.

(9) Bilge pumps with automatic controls are to be provided with a readily accessible manual pow- er-supply switch to activate the pump.

(10) Automatic controls are to be provided with a visual indication showing that power is supplied

to the pump and that the pump is set and ready to operate in automatic mode.

(11) Hand pumps are to be installed in pacity according to 2.

5. Owner's manual

The manufacturers of craft and/or pump pumping system in the owner's manual.

such a way that they can be operated at their rated ca-

are to provided with the following information for bilge

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- Type, capacity and position of installation of each bilge pump

- Methods of operation

- Requirements for maintenance