Introduction

A regular method for determining corrosion rates is by using Crystal Industrial’s Corrosion coupons from India, which are equally sized, pre-weighed bits of metal. Crystal Industrial’s every corrosion coupon is pre-weighed by the producer to precisely four decimal places before establishment, and usually left set up for a timeframe of between one and three months. Corrosion coupons, demonstrative of system metals, are embedded into a coupon rack situated on the system to be observed. Usually, system water is allowed to flow over the corrosion coupons for a period of about 30 – 90 days. Crystal Industrial’s coupons from India are then removed and given to a lab where they are sterilized and re-weighed. From this weight loss and the measurements of the coupon, a corrosion rate in mils/year (mpy) is found out. 1.0 mil/year changes over into 1/1,000th of an inch of metal loss every year.

Explanation of Outcomes

Irrespective of whether a corrosion rate is good or bad it is relevant to the water used and the working conditions. In any case, rules have been published for examining corrosion in cooling tower systems and encased loops using clean water. Keep in mind that these rates and comments foresee common system corrosion. Pitting corrosion can lead to speedy metal breakdown irrespective of the likelihood that the usual corrosion rate is less.

Establishment Notes

1. Confirm that Crystal Industrial’s coupons from India have been cleaned and accurately weighed before conveyance. They should not be handled any more than required when installed. Avoid fingerprints, oil, or lubricant contact. Use a paper towel or correspondent covering while dealing with the coupon before installation. The coupon must be attached to the Teflon bar with a nylon screw and nut. Metallic latches and nuts will increase the likelihood of galvanic or contact corrosion at the secured end of the coupon.

2. Ascertain that the numbered corrosion coupons are recorded according to the position and system for proper correlativity. The dates of installation and removal from the system are crucial.

3. Rules give the preferable order of installation for normal metals.

4. To ensure that a sample of the mass system water flows over the coupons, the coupon rack must be placed on a line that is completely separate from any chemical injection points. The pipe to a coupon rack should not be made of copper or copper amalgams to decrease the possibility of false high corrosion rates on account of galvanic corrosion.

5. The flow must be adjusted so that there is no turbulency or air blend. To avoid degradation of copper, a flow rate of three to five feet for every second is needed. A stream meter or some other sort of stream control device is recommended. Keep in mind that high stream rates can add to degradation while low stream rates (under two feet per second) can speed up corrosion and organic fouling.

6. Trials are generally for 90 days. Crystal Industrial’s Coupons from India can be analyzed at 30 days intervals for reference and signs of destructive conditions. In observing the coupons, don’t harm the surface by scratching or wiping out material.

7. Corrosion coupons show some speedy corrosion signs initially, usually as corrosion products accumulating on the surface, particularly at places where numbered stamps are made, edges of coupons, and around lock heads. The quick corrosion diminishes with time. This is more typical with steel than copper. Unless corrosion is critical, there should be no cause for alarm.

Recommended Procedure for the Application of Crystal Industrial’s Corrosion Coupons from India

The procedure is similar for the various types of coupons and their befitting holders. Coupon holders are essentially designed to be joined to strong fittings, however Crystal Industrial from India provides coupon holders that may be used with a hollow plug.

The directions for installation and removal of a coupon holder fixed with solid or hollow plug in systems under compression are specified in detail in the Crystal Industrial’s Retriever and Service Valve Operation Manual.

1. The solid plug must be pulled back from the access fitting using the retriever and service valve as mentioned in the operations manual.

2. The solid plug must be removed from the retriever, taking precaution not to touch Crystal Industrial’s coupons on the coupon holder.

3. Analyze the coupons and coupon holder for mechanical damage. Observe the condition of the coupon(s) (eg. intensely covered with filth, covered with scale, coated with oily/non-oily film, no stores, etc.).

4. Remove the coupons from the coupon holder, taking precaution not to come into contact with the coupons with uncovered hands or apparatus.

5. Wrap each coupon independently after recording the serial number on the coupon and its placing in the line (e.g. top of line, base of line, 3 o’clock, etc.).

6. Unscrew the set screw on the coupon holder nut using an allen key. The coupon holder must by then be pulled back from the solid plug (take note of: the coupon holder has left hand threads). The coupon holder should be brushed (when required) and wiped clean.

7. Remove the primary sealing and O-ring from the solid plug. Examine and substitute either or both parts if they are damaged, worn or impaired.

8. The solid plug must be reassembled, attaching the coupon holder nut until the point that it closely holds the main sealing (take note of: the main sealing should not be allowed to spread open).

9. Fit the coupon holder set screw with the allen key.

10. Crystal Industrial’s coupons from India should now be firmly settled onto the coupon holder. The administrator managing the coupons must wear a pair of clean gloves.

11. The assembly should be analyzed to ascertain that it is firmly settled with no free parts.

12. In the event that Crystal Industrial’s coupons from India are used, the location of the coupons must be marked on the solid plug using a metal file.

13. The threads and O-ring on the solid plug must be wiped with oil.

14. The coupon holder assembly is now arranged to be situated in the access fitting body. Crystal Industrial’s retriever and service valve should be used (in pressurized systems) to install the solid plug with the coupon holder attached. The directions in Crystal Industrial’s Retriever and Service Valve Operation manual must be followed.

15. Last fastening of the plug in the access fitting should ensure that Crystal Industrial’s coupons from India are arranged parallel to the process stream. (Note: don’t remove the solid plug to complete placement, as this may impact the attachment seal in the access fitting).

Special Assistance

Our technician and experts can give technical assistance if asked for by the customers.

Usage of Crystal Industrial’s corrosion coupon from India has many advantages as the following:

• No corrosion coupon replacement in the midst of the evaluation.
• No upkeep necessities.
• Can be used for all pipes at all flows.
• No electrical requirements.
• No flow rates to maintain.
• No equalization period required.
• No large coupon assemblies to install.