Current Application Status Of Steel Pipes in Marine Engineering

1. Application in functional systems

There are many conventional equipment systems. Mainly: bilge water, ballast, drainage, domestic sewage, air, measurement, injection, domestic water, fire protection, cargo oil, tank sweeping, ventilation, inert gas, heating, tank washing, foam fire extinguishing, water sprinkling, evaporative gas, liquid level telemetry, valve remote control, and other systems.

Special equipment systems are essential for special-purpose "ships" and "marine engineering". Such as special systems for ships transporting liquefied petroleum gas (LPG) and liquefied natural gas (LNG). Special drilling and production equipment for "marine engineering", crude oil processing/liquefied petroleum gas/liquefied natural gas processing (process) systems, special mooring systems, flare systems, etc.

2. Application in construction

"Steel pipes" used in construction (mainly "marine engineering"), such as conductor frames, drilling rigs, underwater steel columns, waterproof casings, mooring brackets, module brackets, helicopter platforms, flare towers, etc.

3. Special purpose applications

Special purpose "steel pipe" - drilling riser and submarine oil pipeline.

(1) Riser: Usually the length of a single riser ranges from 15.24 to 22.86 m. Ddeep water is 24.38 m, 27.43 m, 30.48 m, and even 36.58 m in length. When choosing the length, the main consideration is storage and loading and unloading characteristics. The main material of deep-sea drilling riser is pipeline steel that meets API standards, mainly API 5L X80, and is developing towards higher strength levels such as X100 and X120. In addition, high-performance titanium alloys and aluminum alloys are gradually being used in deep-sea drilling risers, and they meet the use requirements well, including strength and life. The production methods of deep-sea drilling risers mainly include seamless pipes and straight seam submerged arc welded steel pipes. Among them, straight seam submerged arc welded steel pipes are widely used.

(2) Submarine pipeline: The inlet pressure of the pipeline exceeds 20Mpa (the highest on land is 13 Mpa). The pipeline material ranges from X60, X70, X80, and some will use X100, very high strength steel, and X120 ultra-high strength steel. Long anti-corrosion life, high-density weight layer, and low-cost development.