Stainless steel reactor
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We use a stainless steel reactor equipped with three layers of stainless steel (304) coils, one for steam (around 2.5 bar) and another for cooling water (around 4 bar). The pH level inside the reactor ranges from 3 to 12. It has been in use for 13 years now; I would like to ask how much longer these coils can continue to function without any problems? Thank you :)
Perform radiographic testing to determine the thickness and calculate the amount of thinning. Then, it’s also necessary to find the original design documents and determine the design service life.
Regularly measure the thickness of the containers; it’s impossible for anyone to determine their service life. By controlling the quality of the raw materials and the finished products, they might still be fine even after 10 years.
May I ask, does anyone know how long stainless steel 304 pipes can be used at 90°C (pH value 3–12)?
Generally, if conditions permit, use a thickness gauge to check the thickness of the reactor equipment itself; as long as it’s in good condition, continue using it.
Take a look at the design documents to find out what the pipe wall thickness is, then measure it again to see how much is left.
Dear all, thank you for your replies. What I would like to ask is the normal service life of 304 stainless steel pipes under conditions of 90°C and a pH value of 3 to 12.
Does the 304 stainless steel material undergo any changes under acidic or alkaline conditions, at temperatures ranging from room temperature to 102°C, within a pH range of 3 to 12?
This post was last edited by nj1952 on 2017-6-15 at 21:35. If this reactor is a pressure vessel, it must undergo statutory inspection in accordance with TSG R7001-2013 \"Rules for Periodic Inspection of Pressure Vessels\". If the device is not a pressure vessel, it is recommended to follow the requirements of TSG R7001-2013 \"Rules for Periodic Inspection of Pressure Vessels\" for inspection, in order to determine the interval for the next inspection and ensure the safe and stable operation of the device.
Under these operating conditions, the coil is susceptible to alkali embrittlement.