How to maintain stainless steel tower in daily life
Information summary：The core of daily maintenance for stainless steel towers is to stabilize parameters, check inside and outside, clean frequently, prevent corrosion, and perform regular calibration according to the "patrol week/month quarter year" classification, which can significantly extend the service life and reduce unplanned shutdowns.
The core of daily maintenance for stainless steel towers is to stabilize parameters, check inside and outside, clean frequently, prevent corrosion, and perform regular calibration according to the "patrol week/month quarter year" classification, which can significantly extend the service life and reduce unplanned shutdowns.
1、 Daily patrol inspection (mandatory for each shift)
1. Monitoring of operating parameters
Pressure: Top/bottom pressure, pressure difference (packing/tray resistance), abnormal conditions need to be investigated for blockage or leakage.
Temperature: Tower top, tower bottom, feed/reflux temperature to prevent overheating and thermal shock.
Liquid level: The liquid level of the tower kettle and reflux tank is strictly prohibited from being full or dry, and high and low alarms are set.
Flow rate: feed, reflux, discharge flow rate, stable load and anti fluctuation.
Vibration/Noise: Abnormal vibration inspection for fasteners, internal components, and foundation settlement.
2. Tower body and external inspection
Appearance: The cylinder, head, weld, connecting pipe, and flange are free from deformation, cracks, corrosion, and leakage.
Insulation/anti-corrosion: The insulation layer is intact, without detachment or moisture; The exterior paint/passivation film is intact.
Foundation/Foot: No cracking, settlement, or loose bolts.
Attachment: Pressure gauges, thermometers, safety valves, vent valves, and level gauges are sensitive and correct, and safety valves are regularly calibrated.
3. Internal components and media (visible/accessible)
Packing/tray: No blockage, deformation, or detachment, distributor/collection tank is not damaged.
Material: No abnormal discoloration, coking, impurities, strictly prevent the enrichment of corrosive media such as chloride ions and sulfides.
2、 Regular cleaning (weekly/monthly/quarterly)
1. External cleaning (weekly)
Soft cloth/sponge+neutral detergent (pH 6-8), wipe along the texture, do not use steel wire balls or scouring pads.
Water stains/salt spray: Rinse with clean water → Dry with a dry cloth → Apply a thin layer of stainless steel care agent to prevent fingerprints and rust.
Strictly prohibit: chlorine bleach, strong acid and alkali, and scratching with hard tools.
2. Internal cleaning (monthly/quarterly, depending on operating conditions)
Shutdown → Cooling → Evacuation → Nitrogen Replacement → Blind Plate Isolation → Gas Analysis (Combustible/Oxygen/Toxic).
Mild: Rinse with deionized water/low-pressure steam, soft brush to clean packing/tray sediment.
Heavy: neutral/weakly alkaline cleaning agent circulation → rinse with clean water → dry; Use strong acid with caution to prevent pitting/intergranular corrosion.
Key: Strictly control Cl ⁻<50ppm for 316/316L; 2205 duplex steel is resistant to sulfide stress corrosion.
3、 Corrosion prevention and passivation (quarterly/semi annual)
Passivation film repair: acid washing (5% nitric acid+0.5% hydrofluoric acid, 40-50 ℃) → neutralization → rinsing with clean water → drying → passivation (20% nitric acid, room temperature for 30 minutes).
Local rust spots: 80-120 grit sandpaper lightly ground → polished → passivated → protected by a care agent.
Isolation of dissimilar metals: Rubber/PTFE gaskets are added between stainless steel and carbon steel/aluminum to prevent electrochemical corrosion.
4、 Fasteners and lubrication (monthly)
Bolts: The tower body, flanges, manholes, and support bolts are evenly fastened diagonally to prevent thermal expansion and contraction loosening.
Valve: Clean the valve core and sealing surface, lubricate the valve stem/packing with food grade/high-temperature grease.
Rotating parts: Mixing, pump, and reducer should change oil/grease periodically, and there should be no leakage in the seal.
5、 Annual maintenance (shutdown for major repairs)
Open lid inspection: tray, packing, distributor, support, demister, repair or replace damaged parts.
Wall thickness testing: Ultrasonic thickness measurement, focusing on welds, heads, and connections, to evaluate corrosion rate.
Water pressure/air tightness test: Conduct a pressure test at 1.25-1.5 times the design pressure and hold for 30 minutes without any leakage.
Safety valve/instrument calibration: Full range calibration to ensure reliable interlocking.
Foundation and steel structure: measuring verticality, settlement, and anti-corrosion renovation.
6、 Common problems and solutions
Pitting/rust spots: Cl ⁻ exceeds the standard → chlorine reduction+passivation+regular testing.
Weld corrosion: intergranular corrosion → solution treatment+low sensitivity welding.
Packing blockage: material coking → shutdown cleaning+optimization of process to prevent coking.
Leakage: flange/seal → replace gasket (PTFE/metal winding)+evenly tighten.
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