PROCESSING
HEAT WITH

eQ

LNG

Foundation Freeze Prevention

To achieve liquification, the gas must be cooled down to -160 °C. LNG occupies only 1/600th of the volume of natural gas. So liquifying is an economic option for storage and transport. Linde was assigned by the Norwegian Skangass AS to build a LNG plant at Stavanger in Norway, including a LNG storage tank with a diameter of approximately 50 m.

Because of the -160 °C inside the storage tank, frost can occur around and under the tank and in the foundation of the plant, causing frost heave cracking. This can pose a serious risk to safe operation. An electrical heat tracing system prevents this by keeping the structure‘s at 5 °C. Reliability is the key requirement, so eltherm engineers developed a redundant system with was chosen. 50 heating circuits in normal operations and 40 circuits in essential generator mode allow one system to be repaired in the case of unexpected failure, while the other maintains normal function. In addition to the foundation heating a ring-heater beneath the ring wall was installed to prevent freezing. The scope of supply included engineering and design, installation and commissioning as well as power and control systems.

The pipeline network of the LNG plant with all drums and pumps is heated to +10° C for freeze protection. Also, process temperatures between 15 °C and 140 °C are maintained to ensure that the gas liquefaction process runs smoothly and safely.

Linde AG is a global leader in natural gas liquefaction plants and consulted eltherm engineering to develop a custombuild solution for the Stavanger LNG plant in Norway.

Frost protection on the foundation slab required 16 heating circuits, 12 in the foundation and 4 under the ring wall. To take account of the highly corrosive ambient conditions, the ELKM-AG-N trace heater with its robust fluoropolymer insulation was employed. It is chemically resistent even at high temperatures and is certified for hazardous areas (Ex area). Additionally to the heating system, eltherm provided the complete control room for power and control. Strong emphasis is placed on energy efficiency and running cost reduction. An under-run alarm with 2 °C and an excess alarm at 15 °C ensures that the liquefaction process is never disturbed.

BENEFITS

Technical advantages

  • Exact temperature maintenance during the entire gas liquefaction process
  • Reliable function thanks to redundant design
  • Simple, safe operatoin with power and control system
  • Trace heating systems for hazardous areas covered by ATEX approval
  • Repair and easy maintenance of PTFE insulated trace heaters
  • Turnkey service including complete engineering, design, installation and commissioning
  • Economical, energy efficient heating solution

eltherm Solutions

  • Fluoropolymer-insulated trace heaters ELKM-AG-N
  • Mineral-insulated trace heaters ELK-MI-VA
  • Self-regulating trace heaters ELSR-N
  • Self-regulating high temperature trace heaters ELSR-H / ELSR-SH
  • Junction box Ex-It-R approved for hazardous areas
Temperature Mainetance and Freeze Prevention on LNG tank foundation, Pipelines, Drums and Pumps

USED PRODUCTS

ELSR-FHP       ELKM

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Contact Person

Jannik Heinrichs

eltherm GmbH (Headquarters)
Ernst-Heinkel-Straße 6-10
57299 Burbach
Germany

Phone: +49 2736 4413 8201
Contact now

Dan Potter

eltherm Canada Inc.
1155 Appleby Line, Unit E7
ON L7L 5H9 Burlington
Canada

Phone: +1 (289) 812-6631 1
Mobile: +1 (289) 983-5943
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Approvals

ABS

ATEX
INMETRO
KTL
Ukraine
VDE
EAC
IECEx

100
heating circuits

100%
functionality

TAKING CARE OF YOUR PROCESSES

IN GOOD HANDS 24/7

We make sure that your processes run smoothly. We check safe function of the EHT system and conduct maintenance and repair – wherever and whenever. This saves you costly down times.


 

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Phone: +49 (0) 27 36 / 44 13-0

Fax: +49 (0) 27 36 / 44 13-50

E-mail: info@eltherm.com

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