Non-flanged cargo piping is connected by which device?

• A. Dresser Coupling
• B. Flange
• C. Welded Joint
• D. Flare Fitting

Answer: (A)

Non-flanged cargo piping is joined by a device that clamps around the pipe ends and seals with a gasket. The dresser coupling consists of two housing halves that grip the pipe ends and, when tightened, compress a gasket to create a leak-tight seal. This method lets you connect pipes without welding or adding flanges, and it’s especially useful in tanker operations where sections need to be assembled and disassembled for cleaning or maintenance. It also tolerates small misalignments and works with different materials, which is helpful in cargo piping systems.

Flanges require matching flanged ends and bolted connections, so they’re not suitable for non-flanged piping. Welded joints are permanent and not ideal when sections must be separated for maintenance. Flare fittings are typically used for smaller-diameter lines and rely on a flared end to seal, which isn’t the standard approach for larger non-flanged cargo piping.