hoppe sensor tank list

C ombined Water Ingres s Detec tion and Dewatering S ys tem� � � �

H O W ID F E AT U R E S :

¥ C ombined wa ter ingres s detec tion & dewatering s ys tem

¥ P erma nent level indic a tion

¥ P erma nent hold tempera ture indic a tion

¥ B us s ens or tec hnology

¥ F lexible and eas y ins tallation

¥ M inimiz ed c a ble work

¥ No fixtures ins ide c argo hold

¥ S uita ble for a ll bulk c a rgo

H O W ID S E R VIC E :

¥ E ngineering

¥ C la s s ific a tion a pprova l

¥ Ins ta lla tion

¥ C ommis s ioning

¥ C la s s ific a tion a c c epta nc e tes t

T Y P E AP P R O VE D:

G erma nis c her L L oyd(In preparation for a ll major c las s ific ation s oc ieties .)

S O L V E S T H E P R O B L E M of S OLAS R egulations XII / 12 and XII / 13

HOPPE Bordmesstechnik GmbH

Kieler Strasse 318 • 22525 Hamburg • �� 040 561 949 -0 • Fax: 040 561 949 -99 • Web: www.hoppe-bmt.de

HOWID_Info_Doku November /2003 1/9

Combined

Water Ingress Detection

and

Dewatering System

Content: Page 1 General ....................................................................................................................................2

1.1 Water Ingress Detection.........................................................................................................2

1.2 Dewatering ..............................................................................................................................3

2 Functions .................................................................................................................................4

2.1 Alarms and Indications..........................................................................................................4

2.2 Override Function ..................................................................................................................5

2.3 System Test..............................................................................................................................5

2.4 HOWID-Single Line Diagram...............................................................................................5

3 Sensors for Water Ingress Detection ....................................................................................6

4 Other Equipment....................................................................................................................7

5 Features ...................................................................................................................................8

6 Service......................................................................................................................................8

7 Relevant Regulations and Interpretations ...........................................................................8

HOPPE Bordmesstechnik GmbH Kieler Strasse 318 • 22525 Hamburg • � 040 561 949 -0 • Fax: 040 561 949 -99 • Web: www.hoppe-bmt.de

HOWID - System


1 General

HOWID is used for water ingress detection and alarm arrangements installed on bulk carriers for compliance with SOLAS Chapter XII, Regulation 12 and 13. The system task is to detect the inflow of water into specific spaces within the vessel and to give some indication of the rate of inflow in order to give warning of conditions that could threaten buoyancy, stability and structural integrity of the hull. The system is also used for indication/supervision of a dewatering process of forward spaces according to SOLAS Chapter XII, regulation 13.1 1.1 Water Ingress Detection The system determines the presence of water by direct means of detection by physical contact of the water with a pressure sensor and is capable of continuous operation while the ship is at sea. Cargo holds are monitored for a pre-alarm and a main-alarm water level. Compartments other than cargo holds are monitored for the presence of water. Beside of alarm signalling according to SOLAS regulations the system presents continuously the actual water level and the water ingress rate in m/h of each hold and compartment. Sensors and equipment are installed accessible for survey, maintenance and repair and are capable to detect the water level for cargo hold installation. In compartments other than cargo holds is one detection level only. Preferable installation positions of sensors are the bilge wells. An installation at centre line is possible for corrugated bulkheads. Independent from sensor location the level indication and alarming is list corrected and refers to the ship’s centre line. Sensors are capable to operate in cargo/water mixture for the selected range of cargoes such as iron ore dust, coal dust, grains and oils using sea water with a suspension of representative fine material for each cargo. Sensors to be installed in holds intended for use with cargoes that require protection against ignition caused by electrical installations are of an analogue certified safe type HCG 2011 (Ex ia)


HOWID - System


1.2 Dewatering 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 HOWID 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 butterfly 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.


HOWID - System


2 Functions HOWID is an independent microprocessor system and is processing the pressure sensor data via a serial network. Depending on the pressure signal and the seawater density the pre- and main-alarm level limits are generated and displayed. Flooding levels, level alarms, ingress rates, etc. can be transferred to separate monitoring / alarm systems or to the loading computer by serial data connection. The reading station HOWID MIP is equipped with a foil key board and a 4-line digital display for level and alarm indication as well as for inputting and adjusting of parameter. A mimic panel for alarm indication, override functions and dewatering functions is provided. 2.1 Alarms and Indications Visual and audible alarms and indications are provided in accordance with IMO regulations. Following alarms are generated: (signalisation is dimmable)

ALARMS INDICATIONS • Device failure • Power failure • System failure • Sensor failure • Dead man alarm (3min)

• Cargo Hold Pre Alarm 0,50 m • Cargo Hold Main Alarm at 15% of hold

depth above bottom; max. 2,0 m • Compartments Water Ingress • Fore Peak Water Ingress • Level Indication • Ingress rate above set value

The alarm system includes following main functions:

- Electrical power from two independent electrical supplies. Failure of either electrical power supply is indicated by an alarm.

- Testing audible and visual alarms. - Self–monitoring and alarming of the sensors and connecting cables - Detection of a pre set level of water in any space will activate an alarm indicating the

cargo hold affected - alarm signalisation distinguish between pre- and main-alarm level - Time delays are incorporated to prevent spurious alarms due to sloshing effects associated

with ship motions - If an alarm is not acknowledged within three minutes a dead man alarm is created.

A potential free contact is provided to activate the general alarm


HOWID - System


2.2 Override Function The system comprises an individual alarm override function for the sensors installed in holds that may be used for water ballast to permit deactivation of the alarm for that hold. The alarm is reactivated automatically upon completion of de-ballasting and changeover for the carriage of cargo. There is an additional alarm override function for sensors fitted in the ballast tank forward of the collision bulkhead. The status of the override condition is indicated on a mimic panel located on the navigation bridge. 2.3 System Test The system is self–monitoring and alarming of the sensors and connecting cables. The sensors are of the fail-safe type such that any foreseeable failure, which would prevent the sensor from operating, is indicated by an alarm. Sensors are capable of being functionally tested in-situ before and after loading cargo by using a testing device, which allows additionally to check the system accuracy as well. 2.4 HOWID-Single Line Diagram


HOWID - System


3 Sensors for Water Ingress Detection Sensors will be used for detection of water levels. Pressure sensors are provided for cargo holds and tanks. Level switches are provided for dry/void spaces. The sensors have to be installed at aft bulkhead of cargo holds. One sensor/cargo hold is sufficient when the sensor is installed centreline otherwise two sensors have to be installed one PS; one SB. For dry spaces is one level switch installed at aft wall sufficient. The pressure sensors of types HCG 2011; HCG 2031 and HCG 4010 are provided for installation in cargo holds and spaces for detection of water level in corresponding compartments. The Sensors are executed in protection class of IP68 in accordance with IEC 60529 as specified in SOLAS regulations. The sensors are type approved for operation in all cargo/water mixture. The sensors were tested in following cargo/water mixture:

� Iron ore particles and water � Grain particles and water

� Coal particles and water � Aggregate (sand) particles and water

Preferable sensor installations:

Sensor Installation in Bilge well access via void space

Sensor Installation in Bilge Well via Sounding Pipe


HOWID - System


Sensor Installation in Cargo Hold: (around centreline at aft corrugated bulkhead)

Sensor for installation in dry spaces: (Principle Arrangement Sketch)

4 Other Equipment The HOWID MIP and mimic panel have to be installed on the navigation bridge. Sensors will be installed in cargo hold, tanks and spaces. Electronic parts for control of valves of dewatering system are installed forward of collision bulkhead in a dry space. The enclosures to be made in protection class IPx8 for all electrical equipment of the dewatering system. Pressure height is equal to the height of the spaces in which the electrical equipment is installed. All actuators used for valves of dewatering system must be suitable for underwater operation. The butterfly valve at collision bulkhead acc. to SOLAS regulation II-1/11.4 has to be remote operated from the HOWID operation panel. Electrical and pneumatic parts for control of actuators are installed in an IP68 switch box.


HOWID - System


5 Features - Combined water ingress detection and dewatering system - Continuous level indication

- Continuous temperature measurement

- Bus sensor technology

- Flexible and easy installation

- Minimized cable work

- No fixtures inside cargo hold

- Suitable for all bulk cargo

6 Service

- Engineering

- Classification Approval

- Installation

- Commissioning

- Classification Acceptance Test

7 Relevant Regulations and Interpretations

• Resolution MSC.134 (76); adopted on 12 December 2002

• IACS: UI SC 179: Dewatering of forward spaces of bulk carrier

• IACS: UI SC 180: Hold, ballast and dry water level detectors

(Chapter XII, Regulations 12 (Resolution MSC.134 (76)) and Performance Standards for

Water Level Detectors on Bulk Carriers (Resolution MSC.145 (77))

MSC 76/23/Add1 Annex 3

ANNEX

AMENDMENTS TO THE INTERNATIONAL CONVENTION FOR THE SAFETY OF LIFE AT SEA; 1974; AS AMENDED

Chapter XII

ADDITIONAL SAFETY MEASURES FOR BULK CARRIERS

9 The following new regulations 12 and 13 are added after existing regulation 11:

“Regulation 12”

Hold, ballast and dry space water level detectors (This regulation applies to bulk carriers regardless of their date of construction) 1 Bulk carriers shall be fitted with water level detectors:

.1 in each cargo hold, giving audible and visual alarms, one when the water level above the inner bottom in any hold reaches a height of 0,5m and another height not less than 15% of the depth of the cargo hold but not more than 2m. On bulk carriers to which regulation 9.2 applies, detectors with only the latter alarm need to be installed. The water level detectors shall be fitted in the aft end of the cargo holds. For cargo holds which are used for water ballast, an alarm overriding device may be installed. The visual alarms shall clearly discriminate between the two different water levels detected in each hold;

.2 in any ballast tank forward of the collision bulkhead required by regulation II-1/11,

giving an audible and visual alarm when the liquid in the tanks reaches a level not exceeding 10% of the tank capacity. An alarm overriding device may be installed to be activated when the tank is in use; and

.3 in any dry or void space other than a chain locker, any part of which extends

forward of the foremost cargo hold, giving an audible and visual alarm at a level of 0,1m above the deck. Such alarms need not be provided in enclosed spaces the volume of which does not exceed 0,1% of the ship’s maximum displacement volume.

2. The audible and visual alarms specified in paragraph 1 shall be located on the navigation bridge. 3. Bulk carriers constructed before 1 July 2004 shall comply with the requirements of this regulation not later

than the date of the annual, intermediate or renewal survey of the ship to be carried out after 1 July 2004, whichever comes first.

Regulation 13

Availability of pumping systems (This regulation applies to bulk carriers regardless of their date of construction) 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, valve operation by means of remotely operated actuators may be accepted, as an alternative to the valve controls complies with this regulation.

2 Bulk carriers constructed before 1 July 2004 shall comply with the requirements of this regulation not later than the date of the first intermediate or renewal survey of the ship to be carried out after 1 July 2004, but in no case later than 1 July 2007.

hoppe sensor tank list

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