6.4 GREY AND BLACK WATER SYSTEM

1. Grey water pump
2. Black water pump

The grey water system consists of an electric pump (1) located aft of the engine room, a collection tank, located under the bed of the guest cabin on the right by 4 boxes with overflow alarm and 4 grey water booster boxes.

The water discharged by showers, wash tubs and wash basins falls by gravity inside the cases and is automatically drained into the main tank.

The black water system consists of an electric pump (2), next to the grey water one, a collection tank located under the bed of the guest cabin on the left, into which the waste from the toilets is discharged.
The two pumps are normally manually operated and the two tanks are drained overboard (grey water system) or directly into the shore (black water system) by means of the flanged connection.

It is advisable to check the tank indicators at all times or, in any case, to empty them manually before entering the port, in order to avoid having to return to the sea to empty the tanks. The buttons for selecting the manual control are located on the synoptic on the dashboard, together with the warning lights for high level in the tank.

All liquids from services on the upper deck or sun deck are discharged directly into the scuppers.
The tank level can then be monitored via the monitors of the monitoring system.

ENVIRONMENT

Do not discharge soaped waters drained by washing machines and dishwashers in the harbour, inside marinas or near beaches, because of the large amount of foam produced.

ENVIRONMENT

Do not discharge grey and black waters inside harbours, marinas or near beaches: check the tank level when entering the harbour and consider very carefully the position of the ship if discharge is necessary.

WARNING

In case of emergency it is possible to drain the main grey waters tank, by means of the black waters pump, by duly shunting the 3-way valves, located on both pumps.
In case of emergency it is possible to drain the holding tank, by means of the grey waters pump, by duly shunting the 3-way valves, located on both pumps.

Thanks to some selection valves installed under the sinks, the drains of the galley sinks can be conveyed either directly overboard or into the grey water tank.

CAUTION

Within 12 nautical miles from the coast it is forbidden to discharge into the sea the holding tank; it is necessary to keep off the drain pump, exclude the automatic activation if present.

Your yacht can be equipped with a black water treatment system that separates the water from the muddy part of the waste.

The treatment system separates the aqueous part of the black water, which is discharged outboard, from the solid part (mud), which is collected in a dedicated tank. The system consists of:

• Macerator;
• Microfilter;
• UV light.

If necessary, it is possible to wash the black water tank by mixing it with grey water. This is so as not to compromise the operation of the treatment system.

For more information, consult the manual provided by the manufacturer.

The discharge of black water from the shore directly into the sewer system properly is the solution of minimal environmental impact to be taken whenever it is moored in place and equipped.

CAUTION

Before leaving the harbour, check the indicators of level of the black water tank on main deck panel to perform, if necessary, the suction from the shore supply.

Procedure for draining by WASTE outlet.

• Handle the hose by paying attention not to soil the deck teak, and dampen it ahead of time.
• Correctly fit the outlet for shore drain by means of the screw connection.
• Take advantage of harbour services for sewage intake with vacuum system.
• Once the operation is completed, disconnect the hose correctly by paying attention again so as not to soil the deck teak. If necessary, rinse.

We recommend monitoring the tank level before entering the harbour, to evaluate whether to drain it at sea or to take advantage of the shore services, checking beforehand that the harbour towards which you are navigating has the facility to drain the tank by means of the WASTE outlet, located on the starboard side walkway.
To increase the reliability and safety of the system, in case of a fault in the black water pump, it is possible to drain by means of the grey water pump. Under such conditions, it is necessary to ensure the proper opening of the concerned manifold valves.

CAUTION

During the suction black water from the shore is strictly prohibited to:

• Use the toilet;
• Press the command button then operate the pump discharge overboard.

WARNING

Before use, make sure:

• To enable services, if necessary, setting to ON the toilet system breaker on the general electrical panel in the engine room;
• The absence of the red light high-level holding tank.

CAUTION

We recommend regularly monitor the level black water from monitoring system panel (Levels) to achieve optimum use of the retention system in compliance with environmental regulations locally in force.

CAUTION

In case of sinking hazard, if escaping condition allow you this, close the ball valve of the black water drain.

CAUTION

Totally empty the system and the black water tank before the lay-up period in order to prevent any problems with freezing.

CAUTION

For all pleasure yachts, drain at sea of on-board toilets is forbidden inside harbours, landings and moorings dedicated to crafts’ anchor riding, and also within the limit of beaches visited by swimmers, as stated in the single regulations of the Port Authorities.

CAUTION

All pleasure yachts classified for a number of passengers exceeding the 15 units and equipped with toilets can drain the untreated sewage at sea according to MARPOL rules, only BEYOND the limit of 12 (twelve) miles from the coast, while navigating at fixed course and at the maximum speed allowed, anyway not lower than 4 knots.

CAUTION

Direct sea discharge can only be carried out in the event of an emergency.

The holding tank is equipped with a sea water washing system. In order to wash the tank, you have to open the valve concerned, located on the tank door, and start the concerned pump.
This operation has to be performed periodically at a variable time interval, according to the use of the tank.
In addition to this, we recommend constantly checking the filling of the tank, so as to disconnect the pump when necessary.

WARNING

The valve for washing the holding tank must always be closed, except for during washing operations. If the valve remains open, the tank can be flooded and sea water can be boarded.

WARNING

The holding tank washing must be performed only in compliance with legislation in force, in the harbour, only under provided it is connected to the disposal facilities on land.

WARNING

When using chemical products, follow the manufacturer indications meticulously and use the suitable protection devices.

DANGER

Holding tank washing must be performed by experienced personnel and followed carefully until the tank is empty.
An excessive pump operation can cause the intake of a large quantity of water with consequent overfilling and bilge flooding.

Grey and black water system diagram