Abstract: Improved apparatus (10) for pumping of a viscous, flowable material which minimizes the problem of large pressure fluctuations in downstream conduits (16). The apparatus (10) preferably includes a twin piston cement pump (12) and a flexible material delivery conduit (16). A surge control apparatus (14) operatively couples the pump (12) and the conduit (16). The surge control apparatus (14) includes a primary material-conveying body (40) with an elongated surge chamber (46) extending outward from the primary body (40). The surge chamber (46) includes a slidable piston (48) and means for filling a portion of the chamber with a pressurized fluid (62).