Description

1. Introduction

Corrosion Test Coupons, such as the EMT-CI series, are essential tools used within the pipeline and storage industries to monitor and evaluate the rate of corrosion affecting metal surfaces. These coupons provide a direct measurement of material degradation over time, offering critical data that can help predict the lifespan of infrastructure and schedule appropriate maintenance.

2. Design and Composition

Corrosion Test Coupons are typically made from the same material as the pipeline or container system they are monitoring, ensuring that the corrosion data obtained is relevant and accurate. The main technical parameters for these coupons often include:

• Materials: Specified as per Material Request (MR) to match pipeline compositions.
• Sealing Materials: Commonly use Fluororubber or Teflon to withstand various environmental conditions.
• Working Temperature Range: Broadly from -20℃ to 200℃, accommodating most industrial applications.
• Pressure Ratings: Varying from 150LB to 1500LB to suit different pipeline pressures.

Sizes and Shapes

• Rectangular Coupons: Available in sizes like 3″×1″×1/8″ and 2″×1″×1/8″.

• Circular Coupons: Offered in diameters such as Ф31.8×3.2 (1 1/4″×1/8″).

• Coupon Holders: Fixed and Adjustable types are available, with special designs for holding either rectangular or circular coupons.

3. Key Features of EMT-CI Corrosion Test Coupons

1. Material Compatibility. Manufactured from the same materials as the system they are monitoring to ensure that the corrosion data collected is accurate and directly applicable to the pipeline or storage system.
2. Versatile Sealing Materials. Utilize high-quality Fluororubber and Teflon for seals, which provide excellent resistance to a wide range of temperatures and chemical exposures, enhancing the reliability of the seal and the integrity of the test.
3. Broad Temperature Range. Designed to operate effectively within a temperature range of -20℃ to 200℃, accommodating the harsh conditions often found in industrial environments.
4. High Pressure Tolerance. Available in various pressure ratings, including 150LB, 300LB, 600LB, 900LB, and 1500LB, making them suitable for a wide range of pipeline pressures and ensuring safety and effectiveness in high-pressure environments.
5. Flexible Coupon Sizes and Shapes. Offered in multiple sizes and shapes, including rectangular and circular options, to cater to different pipeline configurations and monitoring requirements.
6. Integrated Coupon Holders. Available with both fixed and adjustable coupon holders, which facilitate easy installation and precise positioning within the system for consistent corrosion monitoring.
7. Ease of Installation and Removal. Designed for straightforward installation and removal from pipeline systems, allowing for regular inspection and replacement without significant system disruptions.
8. Direct Exposure to Media: The coupons are directly exposed to the internal media of the pipeline, providing real-time, accurate corrosion rate data that reflects the actual operating conditions of the pipeline.
9. Customization Options: Can be customized according to specific material requests (MR) to match the precise material specifications of any pipeline, ensuring that the corrosion monitoring is as relevant and useful as possible.

Installation and Usage Process

1. Installing Coupons
   Technicians mount the coupons onto a holder using bolts and nuts. They strategically embed insulating gaskets to prevent direct metal contact, eliminating potential interference with corrosion measurements.

2. Integrating into Pipeline Systems
   Operators attach the mounted coupon holder to a plug assembly, then integrate it into the pipeline through welded or flange-mounted access fittings. This configuration exposes the coupons to pipeline media under identical operating conditions as the pipe itself.

3. Monitoring and Adjustments
   After predetermined exposure, technicians remove and analyze the coupons to calculate corrosion rates in mils-per-year (MPY). Based on these results, they adjust chemical treatment programs or optimize pipeline maintenance schedules.

Importance in Industrial Applications

Corrosion Test Coupons are invaluable in industries where the integrity of pipeline systems is critical. By providing a straightforward method to assess material wear and predict possible failures, these coupons help in:

• Preventive Maintenance Planning: Deciding when and what type of maintenance should be carried out on a pipeline.
• Cost Management: Reducing the overall maintenance costs by preventing major repairs.
• Safety and Compliance: Ensuring the pipeline system complies with safety standards and operational regulations.