Sea NG Corporation: Coselle System

3.1 Sea NG Corporation - Coselle System
The Sea NG Corporation has prepared a containment system capable of transporting NG offshore at distances ranging from 150 to 2500 km. The marine CNG tanks manufactured by Sea NG are called "Cosell", based on the disks rolled pipe, which rationally improves the economics of maritime transport of CNG. The company is considered to be pioneer in receiving fully accepted classification from ABS.

The main technology involved in Coselle is to develop a large but efficient CNG containment system with the help of a pipe. A Coselle is composed of miles of small diameter pipes, rolled over a carousel (Therefore, the term Cosell).
The technical characteristics of Coselle systems are shown below:
Most of the

Such diameter and wall thickness of carousel is a mass production of high volume and very competitive industries.
Manufacture: The production of large pressure vessels involves specialized engineering industry with reduced mass production of thousands of ships required for bigger marine CNG projects. On the other hand, the Coselles can easily be manufactured in the current market pipes of almost any size project.
Simplified control systems: collecting hundreds of pressure cylinders together, each of which is equipped with a control valve, 2 pressure relief valves (in accordance with the rules), and drainage is complex and costly. Cosell construction reduces the number of cylinders by at least 50 times, with a significant reduction in the complexity of the containment and the control.
Inspection: Coselles can be strictly controlled with the help of an ultrasonic intelligent control system. The simplicity, accuracy, automation control and speed of Cosell improve safety and reduce operating costs as compared with the control methods used in conventional pressure vessels.
3.1.2 Parameters of a Coselle CNG Carrier
The typical features of carousal are given

These rules are according to the demand of Cargo. For LNG and several other existing vessels; these regulations are mentioned in the International Gas Code (IGC) issued by the International Maritime Organization. The CNG is not considered as a cargo following the IGC, but for the sake of a conservative and reasonable design, the principles of the IGC were observed, where applicable.
The Cosell stranded CNG carrier is built with the concept of twice-hulled vessel of 60,000 deadweight bulk carrier design requirements and costs. In this system, coselles are transported in stacks of six high in the hold of the ship. A total of 18 stacks of coselles (108 coselles) are loaded on ships.
Each Cosell carries 3.09 million standard cubic feet of gas to be sold, so the capacity of the ship is around 330 million standard cubic feet. For safety reasons, the stacks are nitrogen inerted in order to eliminate the danger of fire in case of gas leakage. All fittings and valves are installed over the deck for ease of