Steel Strand for Prestressed Concrete of LNG
What are the Characteristics of LNG?
- Boiling point at atmospheric pressure: -162°C (methane), gas/liquid expansion ratio of 618.
- Density and specific gravity: at atmospheric pressure
Liquid: 0.43～0.47kg/L, the specific gravity to water is about 0.45.
Gas: Density is equal to air at -107℃, specific gravity is 1
Low-temperature vapor clouds are heavier than the atmosphere and generally spread along the ground.
- Colorless, odorless, non-toxic, and non-corrosive.
Why is Natural Gas Liquefied?
Natural gas can be transported by pipeline, but it is more economical to transport it over long distances, especially across oceans. In order to ship natural gas, the volume of natural gas must be reduced, so it is LNG.
Half of the world’s remaining fossil energy is in the form of natural gas, however, often in areas of low demand. In the form of LNG, it can be easily and safely shipped to where it is needed, similar to crude oil.
What is an LNG Storage Tank?
An LNG storage tank is a specialized type of storage tank used for the storage of Liquefied Natural Gas. LNG storage tanks can be found in the ground, above ground, or in LNG carriers. The common characteristic of LNG Storage tanks is the ability to store LNG at a very low temperature of -162 °C.
The Characteristics of Steel Strand for LNG
Through micro-alloying, the technical requirements for special wire rods for low-temperature prestressed steel strands are solved, and the steel strands are guaranteed to have good plasticity at -196°C low temperature. Since the LNG steel strand has been working in a low-temperature environment of -165 °C for a long time, in order to avoid the brittle fracture of the steel strand at low temperatures due to the existence of welding points, we have adopted a production process without welding points. At the same time, a suitable production process has been developed. All the indicators of the product meet or exceed the requirements of the PrEN10138 standard, and have passed the matching test under the condition of low-temperature group anchorages.