Circular Corrosion Coupon


A circular corrosion coupon is a vital tool used predominantly for gauging the rate of corrosion in pipes across multiple industries.


Circular Corrosion Coupons

What is a Circular Corrosion Coupon?

Circular corrosion coupons are an important tool used to measure the corrosion rate of pipelines in many industries. In industries such as oil and gas, pipe rust or damage due to corrosion is a common problem. This is where the circular corrosion coupon comes in.

These circular coupons are essentially samples that are inserted into the tube over a period of time. After this, the coupons are removed and analyzed. The main indicator derived from these circular corrosion coupons is weight loss, which is a direct result of material corrosion.

By using circular corrosion coupons, the operator can clearly understand the degree of corrosion inside the pipe. Data on carbon coupon weight loss provides critical information on corrosion rates. Armed with this knowledge, operators can take appropriate measures to stop the corrosion process.

The use of circular corrosion coupons plays an important role in effectively managing and reducing the effects of corrosion. As a result, the service life of the pipeline can be extended, ensuring that its operation remains efficient and reliable.


Corrosion Coupon EMT For Pipeline Testing

MaterialStainless Steel 304、Stainless Steel 316、DSS F51、Carbon Steel A105N、Inconel 625
Operating Temperature-20~+120 ℃
FeaturesFirstly, it is easy to operate
Secondly, high accuracy and long life
At last, high efficiency and low cost
AdvantagesFirst, they are lightweight and flexible.
Secondly, nice injection efficiency.
At last, accurate corrosion testing.
CCCorrosion Coupons
-CodePlug Body Assembly
PxxxTypeMaterialSealing Material
0No Request0CS0No Request
1Hollow Plug Body1316SS1Viton O-Ring / PTFE Primary Packing
2Solid Plug Body2316LSS2HNBR
Type of Coupon Holder
SRFixed Coupon Holderfor for Assembling a Rectangular Coupon
ARAdjustable Coupon Holder for assembling a Rectangular Coupon
LRLadder Coupon Holder for assembling a Rectangular Coupon
SCFixed Coupon Holder for assembling a Circular Coupon
ACAdjustable Coupon Holder for assembling a Circular Coupon
-Pipe Size
xPipe Size in inch
Coupon Size
A×B×CCoupon Size in inch or mm
Coupon Material
Finishing the Coupon
1Glass Bead
Isolation Gasket
0No Gasket
1Nylon Gasket
2PTFE Gasket
For Example: CC-P221-SR-6″-3″×1/2″×1/8″-MS1018-0-2   CC: Corrosion Coupon

P221: Solid Plug Body in 316LSS Viton O-Ring and PTFE Primary Packing

SR-6″:Fixed Coupon Holder for assembling rectangular coupons and for 6″ Pipe

3″×1/2″×1/8″: Coupon Size             MS1018:Coupon Material

0: Finishing of Coupon is Mill          2: Material  of Isolation Gasket is PTFE

Corrosion Coupons

Calculate the Corrosion Rate

By reducing the sample weight, one can calculate the corrosion rate using a straightforward ASTM formula:

V: Corrosion rate (μm/year)

M∆: Sample weight change (mg)

ρ: Alloy density (g/cm3)

S: Sample area exposed to the environment (cm2)

t: Duration of exposure (h)

K: Fixed coefficient (106*8.76، With units used for other terms)

Primary Advantages of Circular Corrosion Coupon

  1. Ease of Use: The round corrosion coupon can be easily put in and removed from the pipe for testing, making it a convenient choice for corrosion detection.
  2. Versatility: These coupons can be made from a variety of materials commonly used in industry and can be accurately tested in a variety of environments.
  3. Direct Measurement: By directly measuring the weight loss of the joint, the corrosion rate can be accurately determined. This can provide valuable insights into the service life and maintenance requirements of the equipment.
  4. Cost-Effective: Circular corrosion coupons are relatively inexpensive to produce and use, making them a cost-effective solution for ongoing corrosion monitoring.
  5. Preventive Action: The data obtained from these coupons can help predict future corrosion patterns, allowing for timely preventive measures. This can extend the lifespan of the pipelines and avoid costly repairs or replacements.
  6. Adaptable: They can be used alongside other corrosion monitoring tools, such as electrical resistance probes and online analyzers, to provide comprehensive information about the corrosion process.
  7. Multiple Corrosion Types: Different types of corrosion, such as pitting and uniform corrosion, can be studied using circular corrosion coupons, making them a flexible tool for corrosion analysis.
  8. Reliable: They provide a reliable and time-tested method for monitoring corrosion. The use of corrosion coupons is a widely accepted practice in many industries, including oil and gas, water treatment, and manufacturing.

corrosion coupon




Access Fitting Body of Corrosion Coupon

The material of Access Fitting Body
The Type of Access Fitting Body
B2″Welded(suffix “pressure rating” can be added to B)
F2″ANSI Flange(suffix “pressure rating & sealing type” can be added to F)
-Tee Size- pressure rating & sealing type if the flanged end
0No Tee
5Hole for 1/4″SWN Flange
6Hole for 1/2″SWN Flange
7Hole for 3/4″SWN Flange
8Hole for 1″SWN Flange
-Protective Cover Type/ Material
0No Protective CoverMaterial
1Without holeCS or 0
2With holeSS or 1
3Bleed ValveDSS or 3
4Bleed Valve, & Pressure Gauge
For Example, EMT-CIPA-0F600#RF-2-1/CS shows  2″ANSI 600#RF Flange Access Fitting Body in CS, 1/2″NPT(F)Tee, Protective Cover in CS without hole

0F600#RF: 0F_ Access Fitting Body is Flanged in CS, 600#RF _Size is 2″ANSI 600#RF,

2:Tee size is 1/2NPT(F)

1: Protective cover type is without a hole

/CS: Protective cove material in CS

Our Services

Our Service

We offer a wide range of corrosion coupons designed to meet a variety of specific corrosion monitoring requirements. Don’t hesitate to contact us to find the solution that best suits your needs.

In order to demonstrate the high quality of our products, we offer our customers the option to request samples.

We pride ourselves on providing timely customer service. Our team is ready to provide immediate feedback and address your queries.

We strive to provide the fastest delivery time to ensure that you receive your order in a timely manner. Our online support is available 24 hours a day, 7 days a week.

Packaging & Delivery
Our circular corrosion coupons are packaged in CASES, which offer the following benefits:

  1. They are lightweight, feature clean lines, provide insulation, and boast high strength without susceptibility to deformation.
  2. They eliminate the need for fumigation, making the shipping process more efficient.
    Our commitment is to deliver top-quality circular corrosion coupons promptly and efficiently, prioritizing customer satisfaction at all times.


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Shenyang EMT Piping Technology Co., Ltd.

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