Double-pipe pipeline connection flange of hazardous gas delivery system

Abstract

The invention provides a double-pipe pipeline connection flange of a hazardous gas delivery system. The double-pipe pipeline connection flange comprises two connection flange bodies of a hollow circular ring structure, each connection flange body is sequentially provided with an outer pipe connection region, a transition region and an inner pipe connection region from outside to inside, a plurality of ventilation holes are uniformly formed in each transition region, each outer pipe connection region is provided with an outer pipe convex shoulder of a circular ring structure, each inner pipe connection region is provided with an inner pipe convex shoulder of a circular ring structure, and each inner pipe convex shoulder and the corresponding outer pipe convex shoulder are arranged in the same direction. The connection flange is applied to design a gas pipeline, a conventional marine seamless steel pipe can be adopted as an outer pipe, the specification of the outer pipe only needs to be one or two grades higher than that of an inner pipe, the boundary dimension of the whole hazardous gas delivery system pipeline can be reduced greatly, and the discharge capacity of a draught fan drawing air from a negative pressure machine with double wall pipes is reduced. Ventilation continuity between the double wall pipes is guaranteed, the inner pipe and the outer pipe are connected through the flange, building construction is facilitated, and building efficiency is improved.

Description

technical field [0001] The invention relates to a connecting flange, relates to the fields of ships and marine engineering, and the fields of auxiliary equipment for shipping and engineering operations, in particular to a connecting flange for double-pipe pipelines of a dangerous gas delivery system. Background technique [0002] LNG is a hydrocarbon-based gas mixture, the main component is methane, and the explosion limit (mixing ratio with air) is 5~15%; the liquid LNG is -164°C. [0003] With the rise of oil prices and the increasing requirements of international regulations on marine environmental protection, LNG, as a marine fuel, has obvious advantages in reducing costs and reducing atmospheric emissions, especially NOx, CO-2, SOx and particulate (smoke) emissions , known as green energy. In recent years, power ships fueled by LNG have been favored. [0004] For ships using LNG as fuel, the engine room is usually designed according to the intrinsically safe type. Cla...

AI Technical Summary

Problems solved by technology

[0008] Choosing an outer tube with a moderate size can effectively solve the above problems, but the middle space of the double-walled tube will be cut off at the joint of the outer tube, and ventilation can not be achieved.

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