HYDROCHEM C-956A Case Study

HYDROCHEM C-956A is a time proven, corrosion inhibitor for MEA, DEA, UCARSOL, amine-based gas treating systems, and glycol- based dehydration systems.  It has been successfully used by major gas producers, and it has decreased amine losses and equipment failures drastically in many systems.

This graph illustrates the corrosion rate reduction in a DEA bench test using lean amine from an actual system.  The corrosion rates of the uninhibited, “blank” sample began at 7 mpy and gradually fell to slightly below 2 mpy.  The sample which was inhibited with 225 ppm of HYDROCHEM C-956A exhibited a rapid corrosion rate reduction to less than 1 mpy and ended at approximately 0.2 mpy after a 9-hour period.

Continental Products of Texas normally will recommend a Hydrochem C-956A residual of 400 – 600 ppm.  We recommend adding the initial charge dosage over several weeks in order to bring the residual into control over a gradual time period.  We are extremely confident in HYDROCHEM C-956A’s effectiveness.  One of the side benefits of using HYDROCHEM C-956A is that as it passivates the metal surfaces of the system, it also cleans the surfaces of the system.  Old corrosion byproducts are slowly removed as a result.  This product will not foam; however, one question many concerned plant personnel ask is, “Will this product cause my system to foam?”  The answer is NO.

The only foaming that can sometimes be associated with the use of HYDROCHEM C-956A is related to the cleaning properties of this inhibitor.  If the system being treated is dirty and has experienced corrosion related problems, the system will normally have corrosion by-products such as iron oxide and iron sulfide on the metal surfaces.  As these corrosion products are removed, the particulate matter which goes into solution may create foaming.  Good filtration will be a big help in this matter, and normally this will not be a problem after the system cleans up.

We believe that good corrosion rate data prior to implementing HYDROCHEM C-956A is very helpful in evaluating its effectiveness.  As part of our normal service, we will assist you in determining corrosion coupon placement if they do not already exist in the system.  We will also monitor the HYDROCHEM C-956A residual for you by means of a test procedure and furnish you with written recommendations.  The test procedure is made available to our customers if they wish to monitor their systems themselves.This graph illustrates the corrosion rates of the vapors from a reboiler in an actual DGA system.  Prior to the use of HYDROCHEM C-956A, the corrosion rate was 51.5 mpy.  After 5 months the corrosion rate was 0.37 mpy, and by the end of 11 months the corrosion rate had dropped below 0.04 mpy.

Please call 1-800-592-4684 or email CPT if you have any questions.