Corrosion Coupon Assembly Introduction
A corrosion coupon assembly is a critical component in monitoring pipeline corrosion rates. It typically consists of a metal strip or specimen that mimics the pipeline material. Operators insert these coupons into the pipeline’s flow. Over time, they expose the coupons to the same conditions as the pipeline. After a set period, they retrieve and analyze the coupons to assess corrosion levels. This process allows for accurate measurement of material loss and corrosion rate. Moreover, it helps in predicting the pipeline’s lifespan.
Operators can make informed decisions on maintenance and replacements based on these insights. Thus, corrosion coupon assemblies are essential for maintaining pipeline integrity and safety. Additionally, their use helps in optimizing operational costs by preventing over-maintenance and early failures. Their simple yet effective functionality makes them a staple in industries reliant on pipelines, such as oil and gas. Overall, these assemblies provide invaluable data, enhancing operational efficiency and safety standards.
Selection Model
Model | |||||||||||||
CC | Corrosion Coupons | ||||||||||||
-Code | Plug Body Assembly | ||||||||||||
Pxxx | Type | Material | Sealing Material | ||||||||||
0 | No Request | 0 | CS | 0 | No Request | ||||||||
1 | Hollow Plug Body | 1 | 316SS | 1 | Viton O-Ring / PTFE Primary Packing | ||||||||
2 | Solid Plug Body | 2 | 316LSS | 2 | HNBR | ||||||||
3 | DUPLEX SS | ||||||||||||
4 | INCONEL | ||||||||||||
Type of Coupon Holder | |||||||||||||
SR | Fixed Coupon Holder for assembling rectangular coupon | ||||||||||||
AR | Adjustable Coupon Holder for assembling rectangular coupon | ||||||||||||
LR | Ladder Coupon Holder for assembling rectangular coupon | ||||||||||||
SC | Fixed Coupon Holder for assembling circular coupon | ||||||||||||
AC | Adjustable Coupon Holder for assembling circular coupon | ||||||||||||
-Pipe Size | |||||||||||||
x | Pipe Size in inch | ||||||||||||
– Coupon Size | |||||||||||||
A×B×C | Coupon Size in inch or mm | ||||||||||||
– Coupon Material | |||||||||||||
x | Grade | ||||||||||||
-Finishing of Coupon | |||||||||||||
0 | Mill | ||||||||||||
1 | Glass Bead | ||||||||||||
– Isolation Gasket | |||||||||||||
0 | No Gasket | ||||||||||||
1 | Nylon Gasket | ||||||||||||
2 | PTFE 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 Coupon Types (Corrosion Coupon Assembly)
Name | Strip Coupon | Multihole Strip Coupon | Disc Coupon |
Applications | Commonly used for most evaluations. | Use with low-pressure access equipment or through narrow ports that a standard 3/4 inch wide coupon cannot pass. | These circular coupons work in multiple disc monitoring applications. |
Size | 3”*3/4”*1/16” (76.2mm*19.0mm*3.2mm) | 3”*1/2”*1/16” (76.2mm*12.7mm*3.2) With mounting holes | Φ1.25”(31.8mm)Thickness 1/16”(3.2mm) |
Corrosion Coupon Assembly Selection Model
Model | ||||||
EMT-CIPA | Access Fitting Body of Corrosion Coupon | |||||
– The material of Access Fitting Body | ||||||
0 | CS | |||||
1 | 316SS | |||||
2 | 316LSS | |||||
3 | DUPLEX SS | |||||
The Type of Access Fitting Body | ||||||
B | 2″Welded(suffix “pressure rating” can be added to B) | |||||
F | 2″ANSI Flange(suffix “pressure rating & sealing type” can be added to F) | |||||
-Tee Size- pressure rating & sealing type if the flanged end | ||||||
0 | No Tee | |||||
1 | 1/4″NPT(F)Tee | |||||
2 | 1/2″NPT(F)Tee | |||||
3 | 3/4″NPT(F)Tee | |||||
4 | 1″NPT(F)Tee | |||||
5 | Hole for 1/4″SWN Flange | |||||
6 | Hole for 1/2″SWN Flange | |||||
7 | Hole for 3/4″SWN Flange | |||||
8 | Hole for 1″SWN Flange | |||||
-Protective Cover Type/ Material | ||||||
0 | No Protective Cover | Material | ||||
1 | Without hole | CS or 0 | ||||
2 | With hole | SS or 1 | ||||
3 | Bleed Valve | DSS or 3 | ||||
4 | Bleed 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 |
Corrosion can be categorized into three main types:
General Corrosion
General corrosion, commonly known as uniform corrosion, occurs evenly across a large area of a pipeline. This type is the least hazardous because it’s predictable and consistent, making it easier to manage.
Local Corrosion
Local corrosion, also referred to as localized or non-uniform corrosion, poses a greater risk than uniform corrosion. It is more challenging to detect and prevent because it does not occur evenly. Localized corrosion can cause sudden and unexpected damage to metal components, potentially leading to severe accidents, including fires or personal injuries.
Stress Corrosion
Stress corrosion cracking happens when metal materials fail due to the combined effects of tensile stress and a corrosive environment. The onset of stress corrosion can vary; some metals may crack within days, while others might take years. This variability indicates that stress corrosion often has a variable incubation period. Typically, stress corrosion cracks develop dendritically, branching out perpendicular to the direction of the tensile stress.
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