Bare stainless tubes develop biofilm: bacteria settle, slime grows, and the slime creates the crevice chemistry that starts under-deposit pitting. The biofilm also insulates the tube and drops heat output. A filled-PTFE cladding has a smooth, non-stick surface that biofilm cannot grip, so slime washes off and the tube stays clean.
The non-stick surface also reduces chlorination, because the plant needs less biocide. The dense, sintered film is non-absorbent, so it does not hold nutrients. The pre-treated composite seals the 316 away from the bacteria. Material-selection service specifies the smooth-clad heater for water services prone to fouling.
At each dry-dock or outage, the smooth liner is rinsed rather than mechanically descaled. The cladding also resists the local chemistry the bacteria produce, such as sulfides. Procurement buys the smooth-clad heater and notes the reduced biocide dose. The result is a cleaner, more efficient heater.
Plants that measured efficiency before and after cladding report output maintained or improved, because the tube no longer fouls. The thin cladding adds negligible thermal resistance, and the glass-fiber filler conducts slightly better than pure resin. The result is a heater whose output stays stable year after year, because the non-stick surface resists biofilm.
Biofouling is a self-reinforcing problem on bare stainless: bacteria settle, slime grows, the slime traps silt, and under the slime a crevice chemistry develops that starts the under-deposit pitting. The same slime insulates the tube, so the heater works harder and burns more energy for the same process duty. A filled-PTFE cladding breaks that cycle because the smooth, non-stick surface gives the bacteria no place to grip; the slime washes off during normal flow, and the tube stays clean. The dense, sintered film is non-absorbent, so it does not hold nutrients that feed the biofilm, and the pre-treated composite seals the 316 away from the sulfides the bacteria produce. Material-selection service specifies the smooth-clad heater for water services known to foul, and at each dry-dock the surface is simply rinsed rather than mechanically descaled. The thin cladding adds negligible thermal resistance, and the glass-fiber filler actually conducts slightly better than pure resin, so heat transfer is not penalized. Plants that measured output before and after cladding found the efficiency held steady or improved, because the tube no longer insulated itself. The non-stick surface also reduces the biocide dose, because the plant does not need to fight a slime layer that cannot hold on. The result is a cleaner, more efficient heater whose output stays flat year after year.
The non-stick surface also reduces the biocide dose, because the plant does not need to fight a slime layer that cannot hold on. At each outage, the smooth surface is inspected for any adhered debris. Procurement notes the reduced chemical use. The result is a heater whose energy use stays low and whose tube stays clean, because the biofilm cannot establish on the PTFE surface.
The plant also cuts its biocide bill, because the smooth surface does not support slime. The material-selection service documents the efficiency gain. Procurement notes the chemical saving. The result is a heater that is clean, efficient and low-maintenance, because the non-stick film resists the biofilm that would otherwise insulate and pit the tube.
