Linked ship-shore emergency shutdown systems have been required by SIGTTO since the early days of LNG loading and discharge installations. They minimize the consequences of an accident or, if abnormal conditions arise, they allow the process to be shut down with minimum spillage of liquid. Thus consequent risk to jetty and ship’s structures and escape of flammable vapour is avoided.
Since both ship and shore exchange liquid and vapour, the shipside and shore-side Emergency Shutdown (ESD) must be linked. This is to avoid:
Excessive surge pressure on the loading arm connection causing damage, the upstream valve is closed first
Overfilling ship or shore tanks
Risk of damage or spillage due to excessive movement of ship with respect to berth
In addition to safety requirement for ESD, the ship to shore link has been extended to handle communications by telephone.
The ship-shore links are implemented on the ship as follows:
Electric Link
The Ship-Shore Link Control Panel, for Emergency Shut Down System (ESDS)
& Communications, is proposed for complete compatibility with the Middle Eastern and Atlantic Basin import LNG Terminals. These systems are used in 30% of all LNG terminals as either a main system or as a back-up system. The system handles
• 4 Telephone channels are from single ship-shore - Tel. I/F Unit Ch. 1 : MLM
- Tel. I/F Unit Ch. 2 : Hotline Phone
- Tel. I/F Unit Ch. 3 : PABX or Public Phone - Tel. I/F Unit Ch. 4 : PABX or Public Phone
• Shore-ship ESD voltfree contact signals
• Additionally shore-ship ESD signals as required by certain US import terminals (Detail terminal information is referred to ship/shore compatibility booklet.)
The main Fibreoptic Ship-Shore Link system (FO-SSL) is used in conjunction with this Electric ESD system (PNC).
The system relies on Pyle National Ex’d flameproof connectors for connection of the shore cable a the ship shore interface and, once connected to the ship, at the shore receptacle at the shore cable reel. The system uses a 37 way Pyle National telecommunications and ESD digital and a 4..20 mA ship analogue process signal. The 37 pin connector is fitted to the end of a cable reel on which the shore end is provided with a second connector provided by NFI. The telephones on the ship are connected to the shore and are not powered from shipboard supplies.
There is a 4 way earthing connector fitted from ship-shore as used on some European terminals (but this contravenes current OCIMF and SIGTTO regulations) and is not recommended unless insisted upon by the terminal.
A 35 m umbilical is fitted to enable ship-to shore linking. Ship supply is required by some terminals.
The length is increased to 50 m to enable LNGC ship-shore transfer.
A similar 35 m length Earth umbilical is supplied for use in those European terminals which insist on its use.
Configuration of 37-way connector
An additional feature specified by experienced LNGC operators to ensure safe functioning during emergency breakaway requires all ESD circuits to be protected by intrinsically safe (Ex’ia’) techniques. The standard telephone circuits which cannot be passed through Ex’ia’ certified barriers are powered from shore and isolated by Ex’ia’ relays on shore which are switched by continuity loops on board. The principal certification and protection is however Ex’d’.
Telephone circuits are isolated by most shore systems via relay contacts, normally open.
The ship fitted with on 37-way Pyle Receptacle for the comms/ESD circuits and one 4-way Pyle Receptacle whose pins are grounded to the ship’s structure.
Umbilical cable Pyle-Pyle
It is a Requirement of some terminals that the ship provided the ship-shore umbilical cable, which is fitted at each end with 37-way Pyle National Plugs and in the case of earth-bonding cables, 4-way 37-way Pyle National Plugs.
Umbilical cable Pyle-Miyaki Adapter
A special cable arrangement can be supplied to enable a ship equipped with this system to connect to the Miyaki-type explosion proof ship-shore links used in Japanese, Korean Indonesian and Malaysian export terminals.
Electric Systems Explosion Proof (Ex’d;) Pyle National Connector-type A 37-way Pyle National Connector system is fitted at port and starboard manifold area under. The main protection is made by a single explosion proof connector for both ISESD and non-IS telephone circuits. These circuits are mixed in a single multicore cable.
Warning
4 way earth bonding connectors are provided but not used due to SIGTTO regulations prohibiting their use.
Control Enclosure
The NFI-Seatechnik system is installed in : Electric equipment room in Accommodation ‘B’ deck.
This standard unit is an IP55 steel enclosure with part glazed front door panel.
The internal equipment includes:
• 4 off full duplex Telephone Interfaces (Tel/IF)
• 1 full duplex ESD Interface-ship-shore and shore-ship
• Electrical/Optical Interface unit to connect to cabling
• Port starboard Selection panel
• Dual Redundant Power Supply
• Control Alarm Intendance Unit
The system is designed for ship or shore use, and complies whit IEC-945 for shipboard equipment. The equipment complies with SIGTTO July 1987 recommendations.
a) Tel/IF Unit
3 voice and 1 data channels, multiplexed
Channel Ship-Shore Receive carriers
During normal operation the indicators display the status of each telephone channel received from the ship and shore as follows;
Green Indicator : Telephone circuit in operation (Signal received & detected)
Yellow Indicator : Telephone circuit not in operation (No signal received & detected)
b) ESDS
Signals provided by tone for normal safe mode and normal ESD mode.
Fail safe operation function
Status Lights Operation of the ESD system front panel status lamps are as follows.
ESD Status Lamp Operation
Normal Green Fault (Abnormal) when no ship Yellow
Fault (Abnormal) with ship Yellow & Red
ESD Red
No operator actions are required during system operation between the ship
& shore.
c) Control Alarm Module
Alarm indication via failure-open volt-free contact in case of :
• Optical Cable failure
• Power failure to Control panel
• Plug Disconnection
• System Failure, via diagnostics facilities of modems and via ‘Carrier Detect’
d) Power Supply
Input : 100W max at 100-230VAC
Dual Input : (optional) Power supplies are dual fed with auto changeover facility (optional) Power supply 24VDC Indication/Controls : Power Supply distribution module with
Isolation switch, fused/MCCB protection And power on indicator.
e) Port/Starboard Selector Module
This 1U rack module carries port and starboard selector pushbuttons.
The ESD electrical Bx signals from the FO Connection Box to the ESD Module input are routed via this module and the ESD electrical Tx signals to the FO Connection Box are routed via this module.
The module is used to select the shipside connection box in use.
If the system is in operation on the Port Connection box, Port is selected and the red Push button is lit. An Abnormal ESD will occur if the Starboard Pushbutton is pressed and vice versa.
The Telephone signal selection is via the FO Connection Box. This unit outputs the control voltage (24V DC) to select Starboard.
Illustration 1.12.3b Ship-Shore Optic Fibre Transmission
From Mooring Tension Monitor Computer From Mooring Load Monitor Display
Shore Side Port / Stb.d Section
Emergency
Ship-Side Fibre Optic Connector Box
The system utilizes 2 connector boxed, one port and one starboard. Each box measures 560 mm wide x 400 mm high x 200 mm deep, has an NP16 flange on the lower left side for fibre pre terminated shipside connector tail on the right hand side. The tail is factor terminated with approximately 1.5 m cable.
The connector box includes a hinged lockable door and is made entirely from 316 stainless steel. The boxed are certified to IP56 (DNV certificate no 3170644) In the event of damage, the tail can be replaced without the need for specialist skills or tools.
Material : Body 316 Stainless Steel Material : Sleeves Phosphor Bronze Material : Protection Cap Naval Bronze
Optical coupling method Full ceramic ferrule FC single mode type Signal arrangement ferrule no : 1 Tel channel Ship-Shore
2 Tel channel Shore-Ship
3 ESD channel Ship-Shore
4 ESD channel Shore-Ship
5 Spare
6 Spare
Loop-Back Connector (Check Plug)
The loop-back connector is used to carry out local functional test of the system.
It allows a full test to be carried out from the electrical telephone and ESD inputs via the cable, up to the shipside combination connector, mounted in the connector box, without the need for the vessel to be along side a jetty.
Hotline Telephone unit
The dial-less version of the CTS-HP-3 uses two push buttons, Call and Signal.
The SeaTechnik Hotphone consists of the telephone body and handset, an external power-supply and an external speaker.
The SeaTechnik Hotphone supports the following functionality for a maximum of 3 inter connected Hotphones :
z Call The terminal Hotphone(s) are called by lifting the handset and pressing the call button whilst the caller speaks into the mouth piece. These actions result in the caller being heard at the called hones and a visual indication. A two way conversation can commence when the handset on one of the called phones is lifted.
z Signal The terminal Hotphone(s) are signaled by lifting the handset and pressing the signal button. These actions result in an audible tremolo sound and a visual indication at the signaled phones. A two way conversation can commence when the handset on one of the signaled pones is lifted.
PABX/Public Telephones
Standard type European telephones for 48VDC operation with ohm, on hook line impedance 6,000 ohm will be supplied. Line termination shall be by RJ11 standard type socket outlet (USA/International). The telephones may be mounted on the console. They will be connected into the Fibreoptic ship-shore link cabinet and switched by internal circuitry within the Fibreoptic ship-shore link cabinet. The electric system selector is controlled by a yard supplied FO-EL selector switch fitted to the Cargo Control console.
Pneumatic Systems
Two quick-connect male/female umbilical pneumatic connectors are provided at main deck level underneath the manifolds for use with the similar systems used at Ras Laffan and other terminals. These directly trip the loading valves on pressure loss and are sensed by the Yuken ESD system.
Mooring Load Monitor system
The MLM shall comprise of a Marimatech a/s notebook or desktop type computer which will display value and status for all sensors attached to shore side installations.
Normally, the link shall be via a modem via the SSL system Channel 1 and is supplied as part of the FO-SSL. In some areas (Oman), a shore supplied UHF radio modem at 2GHz (Ethernet TCP/IP) is used. If necessary a Strainstall compatible connector will be supplied to allow the data from shore to be transferred.
Software on the computer can interpret Marimatech a/s MLM signals such as Inchon 2 or Stainstall as in Inchon 1 and P’yeong Taek and most Japanese terminals.
Illustration 1.12.4a Mooring Load Monitor System
INCHON NO.1
MS
2 STERN LINES
MD-6
MD-5 MD-4
5 BREAST LINES
BD-4 BD-3
2 SPRINGS
BD-2 BD-1
2 SPRINGS
MD-3 MD-2
MD-1
5 BREAST LINES
HEAD LINES
QATAR NO.2
MD - 2C
BD - 2A BD - 2B BD - 2B
MD - 2D MD - 2E
MD - 2B MD - 2B
1.12.4 Mooring Load Monitoring System