Abstract: A modular system for supporting, on an underlying framework, and at plural pipe-underside locations, an elongate linear pipe. The system includes (a) for each such location, a shoe anchorable to the pipe's underside at that location, (b) for one pipe-underside location only, an anchor securable to the framework for receiving and anchoring the shoe, and thus the pipe also, at this one location, against any motion relative to the framework, and (c) for each other pipe-underside location, a guide securable to the framework for guidably receiving the adjacent shoe in a manner permitting it, and thus the pipe also, at this other location, solely reversible sliding motion relative to the framework along a line substantially paralleling the pipe's long axis.