Page 163 - GRINNELL Mechanical Products Catalogue

pRESSuRE & DESiGN DATA
Risers comprised of rigid couplings can be considered instead of welded or flanged systems . Where thermal movement exists, expansion joints and/or flexible couplings with offsets may be required .
Vertical Piping
When using flexible couplings, the movement that occurs in long lengths of
piping needs to be considered . Each joint can move up to the maximum pipe end separation published . This movement can accumulate and result in the growth of the piping system, for example at the top . Offsets may be necessary .
Should the riser contain branch connections, the movement which occurs at these locations with flexible couplings will also need to be considered .
One solution would be to anchor the vertical piping at appropriate locations to prevent movement which can cause stresses at the branches or equipment . The use of rigid couplings can be an advantage .
As always, good piping practice should prevail . It is the designer’s responsibility to select products suitable for the intended service and to ensure that pressure ratings and performance data is not exceeded . Never remove any piping component or correct or modify any piping deficiencies without first depressurising and draining the system . Material and gasket selection should be verified to be compatible for the specific application .
Refer to back cover for country-specific customer care numbers. 163
Design Data