| 1. | External corrosion of carbon steel under the insulation |
There are cases where corrosion occurs on the carbon steel under the insulation when water penetrates into the insulation material. Especially in cases where the environment has a high salt content such as coastal areas or where the operating temperature is relatively low at 60 - 80°C, corrosion is likely to occur.
| 2. | Current method for inhibit external corrosion |
- 1.Protection of carbon steel by coating
- - Anticorrosive double coating specification
Deterioration due to rainwater or heat - 2.Insulation absorption inhibition
- - Application of water-repellent insulation
Water repellency reduced at 250°C or more - 3.Exterior material joint sealing
- - Application of silicon sealant
Joint cutting
"Keical Ace WIN" is a new type of insulation. The special anticorrosion pigment (calcium phosphate and Nitrous acid type hydrocalumite) is fixed inside calcium silicate (JIS A 9510 type 1-13 equivalent) which features lightweight, high strength and low thermal conductivity.
The special anticorrosion pigment has the following properties:
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When contact is made with water, the alkaline component is released to promote passivation.  |
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When contact is made with salt, salt is adsorbed into the Nitrous acid type hydrocalumite. |
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At the same time, nitrous acid ion(corrosion inhibitor) is released to promote passivation. |
In the highly-concentrated saline environment or when water is intruded, greater anticorrosive performance can be expected from "Keical Ace WIN" with the two properties of a special anticorrosion pigment, compared with conventional insulation.
| Feeding of hot water every 1.5 hrs. to hot-water pipe (3B) Pipe surface temperature: 90-95°C |
Pipe corrosion state after disassembly | |
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| <Test Conditions> Insulation 3" x 30mm with no exterior material 3% NaCl spray, 200 ml x twice per week |
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