What is the maintenance cost of stainless steel towers

Source：www.cnlongyu.cn Release date： 2026-07-28

Information summary：1、 Split of maintenance cost composition The maintenance of stainless steel towers is divided into two parts: maintenance of the tower body and maintenance of the tower internals (packing, nozzles, defoggers, supports)

1、 Split of maintenance cost composition
The maintenance of stainless steel towers is divided into two parts: maintenance of the tower body and maintenance of the tower internals (packing, nozzles, defoggers, supports)
(1) Tower body maintenance
Carbon steel tower (lined with rubber/glass flakes):
It is necessary to periodically shut down and repair the lining, with a major overhaul every 2-4 years, including scaffolding, sandblasting, lining repair, and testing, with a high cost per repair; Once the lining is damaged, the carbon steel substrate quickly corrodes and punctures.
304/316L stainless steel tower:
There is no ongoing expenditure on 'anti-corrosion coating repair'. Stainless steel relies on its own passivation film for corrosion prevention, without the need for painting or lining refurbishment.
Under normal working conditions, daily operations only require:
Annual shutdown visual inspection of welds and blind spots;
According to the scaling situation, high-pressure water/chemical cleaning is used to prevent the accumulation of dirt and the induction of crevice corrosion.
(2) Regular annual basic maintenance project (cannot be omitted)
Internal cleaning: scaling of dust, salts, and viscous materials, with a cleaning cycle of 6-24 months (depending on operating conditions)
Weld seam and dead corner wall thickness testing (for corrosive environments, it is recommended to conduct ultrasonic thickness measurement once every 2-3 years)
Replacement of fasteners and flange gaskets
Maintenance and replacement of spray nozzles and defogging components (consumables, unrelated to material)
2、 Classification of maintenance costs based on materials and operating conditions
Condition A: Conventional weak acid, organic waste gas, general water washing (no chloride ions, room temperature) → 304 stainless steel tower
Tower body maintenance: relatively low
Overhaul cycle: 8-12 years without the need for extensive repairs; Only perform regular cleaning and testing
Annual maintenance features: Almost no tower maintenance costs, with costs concentrated on cleaning and consumables for internal components
Compared to carbon steel lined towers, annual anti-corrosion maintenance expenses can be reduced by over 60%
Condition B: Chloride ions, coastal salt spray, weak acid alkali wastewater, desulfurization and washing → 316L stainless steel tower
Chloride ions are short boards of 304, which are prone to pitting/crevice corrosion; 316L contains molybdenum, and the passivation film has stronger stability.
Maintenance focus: Strictly control the accumulation of dirt in dead corners and avoid salt crystallization in dry/wet alternating areas
Maintenance frequency: annual inspection, cleaning once every 2 years; Under normal operating conditions, the tower body does not require welding repair within 15 years
Condition C: High chloride ion, high temperature, strong corrosion condition (desulfurization wastewater, seawater medium)
304/316L both have corrosion risks and require 2205 duplex stainless steel
The initial cost is higher, but the corrosion rate is lower, significantly reducing downtime for maintenance, and the long-term operation and maintenance costs are better in harsh environments.
Important risk: Choosing the wrong material can significantly increase maintenance costs
For example, forcing the use of 304 tower under chlorine containing conditions:
Point corrosion occurs in the weld seam, tower bottom, and liquid accumulation area within 3-5 years, requiring shutdown for welding repair, polishing and passivation, frequent maintenance, and maintenance costs exceeding those of carbon steel.
3、 Hidden maintenance costs that are easily overlooked (key avoidance pits for stainless steel towers)
1. Cost of crevice corrosion
The accumulation of salt deposits in the bottom liquid accumulation area, dead corners of the support plate, and flange gaps can damage the passivation film over a long period of time;
Countermeasure: Avoid dead corners in structural design, clean regularly, and avoid long-term operation with dirt.
2. Electrochemical corrosion of dissimilar metals
Stainless steel towers paired with carbon steel brackets and bolts can cause galvanic corrosion in humid environments;
Unify the material of fasteners or add insulation gaskets to reduce later repairs.
3. Selection of cleaning agents
Do not use high chlorine cleaning agents to clean stainless steel, as it can cause surface pitting and accelerate damage.
4. Shutdown loss>Maintenance material cost
Frequent shutdown and repair of the lining of carbon steel towers; The unplanned shutdown risk of stainless steel towers is low, and the loss savings from shutdown are hidden benefits.

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