Like bend stiffeners and bend restrictors, the bellmouth protects the flexible pipe from bending to levels beyond its allowable minimum bend radius (MBR). A bellmouth comprises a hollow tube that flares out into a bell-shaped profile at its end, as shown in Figure 13. The flexible pipe exits the bellmouth from this end, and the bell-shaped profile prevents the flexible pipe bending beyond a certain radius within its angular range.
Source: API RP 17L2, Recommended Practice for Flexible Pipe Ancillary Equipment, First Edition, March 2013. Global Standards
Part of a guide tube, formed in the shape of a bellmouth, and designed to prevent overbending of the flexible pipe.
Source: API SPEC 17J, Specification for Unbonded Flexible Pipe, Third Edition, July 2008. Global Standards