Page 161 - GRINNELL Mechanical Products Catalogue

pRESSuRE & DESiGN DATA
Rotational Movement
GRINNELL Flexible Couplings are suitable for use in seismic as well as mining applications . The inherent capability of the flexible coupling to allow for linear movement, angular deflection, and rotational movement make it an excellent choice for reducing stresses in a piping system and to increase pipe life in slurry applications .
For mining applications where the pipe needs to be rotated, the system should be depressurised . The pipe coupling bolts/ nuts can be loosened, pipe rotated, the bolts/nuts re-tightened, and the system be put back in service .
Even distribution of pipe wear can be achieved with this method on the inner service of the pipe .
Note: Precautions are necessary to monitor pipe wall thickness to evaluate pressure capability of the pipe with reduced wall .
Linear Movement
Flexible couplings are designed with the couplings keys engaging the pipe without gripping on the bottom of the groove while still providing for a restrained mechanical joint .
The inherent flexibility of the coupling must be considered when deciding on support arrangements for the piping system as movement can occur in more than one plane (linear movement, angular deflection, and rotational movement) .
Upon system pressurisation, each pipe end within the flexible couplings will expand to the maximum published value . The coupling keys make contact with the face of the groove and restrain the joint . In piping systems, this movement will be accumulative .
Pipe Support
Refer to back cover for country-specific customer care numbers. 161
Design Data