Corrosion Coupons All Products

  • Custom-made for your specific manufacturing process

    Custom-made for your specific manufacturing process

  • For erosion and corrosion prevention and monitoring

    For erosion and corrosion prevention and monitoring

  • Grit-blasted & furnished with insulation for mounting

    Grit-blasted & furnished with insulation for mounting

What Are Corrosion Coupons

Crystal's Corrosion coupons from India are an efficient tool for quantitatively estimating the corrosion rates occurring in an operating system. They also offer a visual indication of the type of corrosion that may be occurring in the system being monitored. Today, corrosion coupons are the simplest and most widely used method of measuring corrosion.

Crystal's Corrosion coupons from India are an efficient tool for quantitatively estimating the corrosion rates occurring in an operating system. They also offer a visual indication of the type of corrosion that may be occurring in the system being monitored.

What is a CORROSION COUPON?

  • Is essentially a piece of metal of a predetermined size, shape and surface area
  • Is a metal with chemical composition that's identical to that of the process equipment
  • Provides a uniform reproducible surface finish
  • Has a unique serial number
  • Is exposed to the same corrosive medium as the process equipmen
  • Is exposed to the corrosive medium for a fixed period of time
  • Gives visual indication of the type of corrosion
  • Indicates the rate of corrosion

World-class Corrosion Coupons from Crystal Industrial

Every Crystal coupon is stamped with an identifying serial number, and every coupon order is delivered with written certification that includes : serial number, material made from, weight and dimensions.

All Crystal coupons are weighed to up to four (4) decimal places, packaged individually in vapour phase inhibited envelopes and sealed hermetically to offer a one (1) year shelf life.

Crystal standard coupons are grit-blasted and besides, they are furnished with insulation for mounting. Mounting hardware is provided along with the coupon holder. Coupons are available in options of Polished, Ground or Weld bead

Crystal Coupons are manufactured from any material and dimension as per client's request. Material may be supplied by the customer to match an existing system.

Corrosion Coupons Range

Strip Coupon

Strip Coupon

19 mm wide commonly strip coupons supplied for most evaluations. The size is 76.2mm x 19mm x 3.2mm with two mounting holes the exposed surface area is 3000 mm2.

Disc coupons

Disc coupons

These circular coupons are used where coupons cannot protrude into the line and interfere with flow or pig passage. Standard size is Ø 31.8mm x 3.2mm. A hole allows for mounting with flathead screw and back-up disc insulation. The exposed surface area is 1,548mm2.

Rod Coupons

Rod Coupons

This pencil-like coupon is screwed into an insulator which is then screwed into an NPT plug Coupon Holder. The rod coupon standard size is Ø 6.3mm x 101.6mm. One end is threaded for screwing the coupon into the insulator. The exposed surface area is 2,109mm2.

Access Fitting

Access Fitting

Access Fitting are specialized piping arrangements which permit internal access to production plant vessels and pipework operating under full process conditions. The corrosion monitoring industry standard for such access systems is based on a 2-inch nominal bore design.

Frequently Asked Questions About Corrosion Coupons

This is one of the most frequently asked questions. There are no particular guidelines about how frequently the corrosion analysis needs to be done. The frequency of how often you should do this analysis depends on some factors; the most important factor being the observed data. If you observe low rate of corrosion, the frequency of analysis should be increased. The corrosion analysis should also be more at sensitive areas, where the probability of risk is more or where there is a history of corrosion.

Now there is a negative consequence if the corrosion coupons are pulled out for analysis too often, especially if you are using the weight loss process. This may provide you with misleading results as the nature of corrosion growth and the calculation involved in measuring the General and Pitting corrosion rates. The expert engineers consider corrosion growth as a non-linear activity and the calculation of prorating the measured corrosion to mpy (mils per year) is linear.

Again if you pull the corrosion coupons after long intervals in the weight loss process, this may also lead to misleading corrosion data. This is due to the fact that, if the process is delayed, the corrosion rates are prorated on an annual basis and hence severe corrosion evens may get lost in the average calculation. For example, if the corrosion data is obtained annually and if there was severe corrosion at a single month, that month's corrosion attributes only 1/12th of the total calculated corrosion data. Moreover, if the corrosion data is not quite large, it may totally get lost in the annual corrosion data.

The two important factors of monitoring corrosion to get effective data are the selection of location and the position within the pipeline where the corrosion coupon or the electronic probe has to be installed. As the objective is to get the corrosion data, it is important that you place the corrosion coupon or probe in the electrolyte, where the corrosion cell exists. Generally, most of the corrosion occurs at the bottom of the pipeline, where the water deposition is most.

Sometimes the corrosion also may occur at the top of the pipelines or you may have to monitor single or multiple phases. Under such circumstances, the corrosion coupons are installed at various parts of the pipelines. For effective corrosion monitoring, the corrosion coupon has to be placed where the corrosion is most, for example, you should not place the corrosion coupon at the top of the pipeline if the corrosion occurs at the bottom of the pipeline.

Besides the process of using weight loss corrosion coupons, there are some other methods as well using which you can monitor internal corrosion on pipelines. It is always suggested to use multiple corrosion monitoring methods to get relevant corrosion data. Besides the weight loss process, the water analysis, use of electronic probes, Fe/Mn and corrosion Inhibitor residuals are other popular ways to measure corrosion.

Technical drawings (Move cursor to enlarge)

Flush Disc Corossion Coupon

Flush Disc Corrosion Coupon

Injection Quill

Access Fitting with Injection Quill

Rod Type Corrosion Coupons

Rod Type Corrosion Coupon

Strip Type Corossion Coupon

Strip Type Corrosion Coupon

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