Terminal Headers for LNG Applications

Product Description

Natural gas is growing in importance as an energy source around the world. In order to facilitate its transportation and storage, it is pressurized into Compressed Natural Gas (CNG) or converted into Liquid Natural Gas (LNG). By cooling it to approximately -160°C (-260°F), the volume of natural gas can be reduced to about 1/614th at atmospheric pressure.

Natural gas is transported in specially designed cryogenic vessels and stored in specially designed tanks. The special pumps that charge and discharge carrier vessels with LNG typically feature an integral shaft with the entire motor, bearings and all other components completely submerged and flooded with LNG. These submerged pumps can be safely supplied with electricity by using our power and instrumentation penetrations for LNG vessels.
SCHOTT Eternaloc® Terminal Headers - Made to last

Eternaloc® terminal headers are ATEX-certified and remain maintenance-free over decades. They are based on propriertary glass-to-metal sealing technology, which is deemed to be the safest technology available today.

A single barrier penetration module consists of a stainless steel flange with the conductors sealed in by means of the compression seal technique.

For additional safety, double feedthroughs provide a second pressure barrier. This allows periodic or permanent leakage-monitoring or inertisation of both pressure barriers.

All current-carrying parts including the cable-plug connections are additionally protected by a creepage extension.

Advantages

Eternaloc® Terminal Headers for use in LNG vessels have the following advantages:
  • Non-aging hermetic glass-to-metal sealing technology enables the safe
    and reliable supply of electricity to the submerged cryogenic pumps
  • Explosion-proof electrical feedthroughs, manufactured according to
    ATEX and IECEx standards
    Resistance to thermo-cycling and thermo-shock
  • High pressure resistance
  • Mechanically rugged
  • In cases of double sealed feedthroughs: periodic or permanent leakage-monitoring or inertisation is possible.
  • Maintenance-free in more than 7,000 LNG applications worldwide, after more
    than 35 years in the field

Applications

Power and instrumentation supply of pumps, turbine expanders and compressors in LNG vessels and landbased terminals

Technical Details

Technology

The glass preform, metal shell and conductor pins made from nickel-iron (C&I) or solid copper (low-ohmic for power) are assembled on a fixture. The complete assembly is heated to a temperature where the glass becomes free-flowing and fills all the space between the metal parts.

During the cooling process, the glass solidifies at its set point. Upon further cooling, the outer metal housing shrinks more than the sealing glass and the conductor (due to its higher coefficient of thermal expansion), leading to a compressive radial force onto the glass body. This leads to an increased hermeticity and tightness even at high temperature or under gas pressure and at thermal cyclic conditions.

After sealing, the parts are cleaned and protected against surface corrosion caused by salt spray as encountered in marine environments.

The nickel-iron conductor pins for control applications are plated with a gold layer.


Features / Specifications

Our penetrations are certified to be explosion proof according to CENELEC (Comité Européen de Normalisation Electrotechnique) or IEC (International Electrotechnical Commission), and are resistant to cold (temperature ranges from -196°C to +100°C).


Forms of Supply and Product Packaging

We can deliver products in accordance to customers’ specifications and / or completely pre-assembled. The penetration assembly also usually includes junction boxes.

Our products are delivered in dust-safe, moisture-safe, impact-proof transportation boxes.

Quality

Our penetrations are manufactured in our ISO 9001 certified plant.

During testing, we determine the quality by testing the penetrations at 1.5 times the design pressure. For more information, please refer to our quality assurance processes.
Trade Fairs & Events
05.
September
Trade fair CIOE - China International Optoelectronic Expo, Shenzhen, China, 05.09 - 08.09.2018
17.
September
Trade fair Gastech, Barcelona, Spain, 17.09 - 20.09.2018
25.
September
Trade fair European Microwave Week, Madrid, Spain, 25.09 - 27.09.2018
12.
November
Trade fair COMPAMED, Duesseldorf, Germany, 12.11 - 15.11.2018
Contact
SCHOTT AG
Christoph-Dorner-Strasse 29
84028 Landshut
Germany
E-Mail to SCHOTT+49 (0)871/826-0
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