ASME CRTD-103 pdf download CONSENSUS ON BEST TUBE SAMPLING PRACTICES FOR BOILERS & NONNUCLEAR STEAM GENERATORS Deposits, particularly metal oxide deposits, can also have significant porosity which has been found to contribute to the underdeposit concentrating mechanism. Higher heat fluxes result in greater rates of evaporation (steam generation) per unit area. During operation, water diffuses through porous deposits and evaporates...