Dewatering System of Forward Spaces for Bulk carriers
FORWARD SPACE DEWATERING CONTROL SYSTEM
According to SOLAS 1974 Chapter XII Reg. 13.1 & IACS UI SC 179 all bulk carrier vessels are required to have the "Dewatering Control System of Forward Spaces". The system must be installed on vessels no later than first inspections of intermadiate and special before 1 July 2007.
DEWATERING means to provide draining and/or pumping facilities to pump out water from spaces which are located forward of foremost cargo hold in case of detection of water inflow into corresponding spaces.
The system task is to operate and supervise the operation of drainage system by control and position indication (open/close) of relevant butterfly valves in corresponding spaces.
Each compartment (except chain lockers) forward of collision bulkhead --- like void space, dry space or tank(s) --- is connected to the system and has to be equipped with a drainage facility. Spaces can be connected to an eductor for drainage, tanks are drained by ship's ballast water system.
A mimic & operation panel is provided for dewatering control and supervision. The mimic panel gives an overview of all valves incorporated in the dewatering process. Switches are provided to operate each valve of the eductor dewatering system individually.
For dewatering of forward tanks the ballast water system is used. The valve at collision bulkhead acc. to SOLAS regulation II-1/11.4 has to be equipped with a remote operated actuation. It's controlled and supervised from mimic panel. The valve has to be open before start of tank dewatering the actual valve position (open/close) is indicated on mimic panel.
This system is designed for remote control of dewatering valve. Because of decreasing in ship's crew, it was a limitation by previous system of local control and sounding. So it has been installed control console in control room. Therefore, it is possible to do remote control and monitoring. This system got the merit that can decrease man-power, take the efficient control. In this ship, it was applied one by one method which is very simple.
When water is present in bosun store or forepeak tank or any foreward space, the alarm of the water ingress alarm system will activated. After the activation of the water ingress alarm system, by using the control panel on the bridge, ship's crew can activate the actuators and pump out the water in the bosun store or forepeak tank or any foreward space.
BASK07 is a forward space dewatering control system for bulk carriers in accordance with SOLAS XII Regulation 13 & IACS UI SC179. The system is designed to operate in conjunction with our water ingress detection system offering complete compliance with SOLAS CHAPTER XII. The system provides remote control of pumping arrangements for ballast tanks and dry spaces forward of the collision bulkhead.
Positive indication of the position of the de-watering valves is given at the control panel fully compliant with IACS UI SC179. Our system is easy to install and combined with our water ingress detection system offers you the simplest and lowest cost route to compliance with SOLAS CH' XII regulations 12 & 13 from a single supplier.
We offer you both PNEUMATIC SYSTEM and ELECTRIC SYSTEM
Product Specification
SIMPLEST SYSTEM ON THE MARKET TO INSTALL
LOWEST COST COMPLIANCE SOLUTION
SINGLE SUPPLIER FOR COMPLIANCE WITH SOLAS XII REG'S 12 & 13
NO WORRY OVER SYSTEM COMPATIBILITY WITH DIFFERENT SUPPLIERS
COMPACT PANEL WITH SIMPLE CONTROLS
SOLAS REGULATION 13
Dewatering of forward spaces of bulk carriers (Chapter XII, Regulation 13.1 (Resolution MSC 134(76)) and IMO interpretation of SOLAS Regulation XII/13 (MSC/Circ.1069))
Regulation
SOLAS Regulation XII/13.1 reads:
1. On bulk carriers, the means for draining and pumping ballast tanks forward of the collision bulkhead, and bilges of dry spaces any part of which extends forward of the foremost cargo hold, shall be capable of being brought into operation from a readily accessible enclosed space, the location of which is accessible from the navigation bridge or propulsion machinery control position without traversing exposed freeboard or superstructure decks. Where pipes serving such tanks or bilges pierce the collision bulkhead, as an alternative to the valve control specified in regulation II-1/11.4, valve operation by means of remotely operated actuators may be accepted, provided that the location of such valve controls complies with this regulation.
MSC/Circ. 1069 reads:
1. The spaces where availability of pumping systems is required in accordance with paragraph 1 of SOLAS regulation XII/13 should be the same watertight spaces where water level detectors are required in accordance with paragraph 1.3 of SOLAS regulation XII/12.
2. This means that paragraph 1 of regulation XII/13 does not apply to the enclosed spaces the volume of which does not exceed 0.1% of the ship's maximum displacement volume and to the chain locker.
Interpretation
1. Where the piping arrangements for dewatering closed dry spaces are connected to the piping arrangements for the drainage of water ballast tanks, two non-return valves are to be provided to prevent the ingress of water into dry spaces from those intended for the carriage of water ballast. One of these non-return valves is to be fitted with shut-off isolation arrangement. The non-return valves are to be located in readily accessible positions. The shut-off isolation arrangement is to be capable of being controlled from the navigation bridge, the propulsion machinery control position or enclosed space which is readily accessible from the navigation bridge or the propulsion machinery control position without travelling exposed freeboard or superstructure decks. In this context, a position which is accessible via an under deck passage, a pipe trunk or other similar means of access is not to taken as being in the "readily accessible enclosed space".
IACS Int. 2003
Note:
IACS Members are to implement this UI for equipment and arrangement approval requests received on or after 1 October 2003. Equipment and arrangements which do not fully comply with this UI may be installed until 31 December 2003 for compliance with SOLAS regulation XII/13.
2. Under this SOLAS regulation XII/13.1:
2.1 the valve specified under SOLAS regulation II-1/11.4 is to be capable of being controlled from the navigation bridge, the propulsion machinery control position or enclosed space which is readily accessible from the navigation bridge or the propulsion machinery control position without travelling exposed freeboard or superstructure decks. In this context, a position which is accessible via an under deck passage, a pipe trunk or other similar means of access is not to taken as being in the "readily accessible enclosed space";
2.2 the valve is not to move from the demanded position in the case of failure of the control system power or actuator power;
2.3 positive indication is to be provided at the remote control station to show that the valve is fully open or closed;
2.4 local hand powered valve operation from above the freeboard deck, as permitted under SOLAS regulation II-1/11.4, is requested, but is not an acceptable alternative to SOLAS regulation XII/13.1 and this UI, unless all of the provisions SOLAS regulation XII/13.1 and this UI are met.
3. The dewatering arrangements are to be such that any accumulated water can be drained directly by a pump or eductor.
4. The dewatering arrangements are to be such that when they are in operation, other systems essential for the safety of the ship including fire-fighting and bilge systems remain available and ready for immediate use. The systems for normal operation of electric power supplies, propulsion and steering should not be affected by the operation of the dewatering systems. It must also be possible to immediately start fire pumps and have a ready available supply of fire-fighting water and to be able to configure and use bilge system for any compartment when the dewatering system is in operation.
5. Bilge wells are to be provided with gratings or strainers that will prevent blockage of the dewatering system with debris.
6. The enclosures of electrical equipment for the dewatering system installed in any of the forward dry spaces are to provide protection to IPX8 standard as defined in IEC Publication 60529 for a water head equal to the height of the space in which the electrical equipment is installed for a time duration of at least 24 hours.
