LNG Bunker Pipe for Gas Fuelled Vessels®
Introducing the LNG Bunker Pipe
Worlds first fully bonded, fully flexible LNG Bunker pipe. Designed as a Pipe in Pipe with ventilated void space.
The insulation properties is based upon LOGSTORs unique LNG insulation system. The insulation system ensures a complete bonding between pipe and insulation. Furthermore is also ensures a 100% waterproof as well as water vapour proof insulation.
Low temperature system
The pre-insulated low temperature pipe system operates as a bonded system in which the carrier pipe and jacket move axially as a whole when the carrier pipe temperature changes.
The pre-insulated pipe consists of a sandwich construction with polyurethane insulation material (PUR) bonded to both the carrier pipe and the protective jacket. High thermal performance is required not only to ensure steady state operation but also to provide fast cool down and low heat gain.
Manufacture
The steel pipe is inserted in a jacket of high density polyethylenene (HDPE). Both ends are sealed with end-jigs and PU foam is injected into the annulus. After a few minutes of curing the end-jigs are removed, pipe ends cleaned and the pipe is finished.
Qualification
To qualify Logstor’s pre-insulated pipe systems for LNG applications, Logstor carried out a number of tests at cryogenic temperatures. The tests performed and documented by Sintef Energy Research in Norway verify that the functional requirements of EN253 are fulfilled. The design has since then been confirmed with successfull deliveries to
several LNG Terminals and LNG Vessels.
Mechanical properties of the PUR Insulation foam
- Mechanical test of PUR for thermal insulation to verify compressive strength, tensile strength, shear strength, linear coefficient of expansion and thermal conductivity (all measured at -165°C).
- Test of bond strength between PUR and carrier pipe when carrier pipe is cycled between ambient and cryogenic temperatures.
- Full scale test of a 4” and 20” pre-insulated pipe loop cycled between -165°C and +65°C supported by FEM analyses.
Field joints
Installation of triple sealed field joints using state of the art shrink technology is simple and requires only standard tools. Material properties in the field joint area correspond to that of the straight pipe.
System components
Pre-insulated pipes are supplied in lengths up to 12 m (40 ft). Elbows, branches and spools are supplied according to customer specifications.
PU Foam Propellants
The influence of various propellants on the invironment:
Regulations
- Montreal protocol 1986 (rev. 1992)
- CFC-11 prohibited in Europe in 1996
- HCFC prohibited from 2005
The environment
All pre-insulated pipe systems delivered by LR MARINE is using c-pentane as foaming propellant.
We specifically aim at cleaner technologies and recycling. The use of c-pentane ensures that there is minimal. This effort has an impact on the immediate environment, including the working environment. Consequently the production processes are constantly optimised.
The Design
The inner pipe is a fully pre-insulated system capable of operating with LNG (-163°C). In case that the bunker line is to be used frequently e.g. Ferry operations the pipe will be kept at cryogenic temperature by a circulating LNG circ. line@-163°C. The cool down function to be controlled from the bunker alarm-/control-/safety system.
To fullfill classification rules the inner pre-insulated pipe is surrounded by an outer pipe with a void space with forced ventilation.
The special integrated design of the LR Marine LNG Bunker Pipe System allows the inner pre-insulated pipe to move freely in 3 axis inside the outer pipe.
The system is designed with pre-defined fix-points to control movements and is virtually maintenance-free.
The design also allows almost any length of the pipesystem. Over 1000 m is possible.
Typical iso-metric design of LNG Bunker line system:
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