01
Strip / Weight-Loss
General corrosion-rate trending in pipelines, vessels, and bypass loops.
One-hole, two-hole, flat, or ladder-mounted
Corrosion Monitoring
Corrosion Coupons
Material-matched specimens prepared for repeatable weight-loss monitoring in pipelines, vessels, and process systems.
- Geometry
- Strip, disc, cylindrical, specialty
- Material route
- Process-matched alloy
- Surface
- Prepared to specification
- Traceability
- Serial, mass, dimensions, MTC
Weight-loss monitoring
A simple specimen. A disciplined measurement chain.
Corrosion coupons establish a direct weight-loss measurement over a defined exposure period. The coupon material, geometry, prepared surface, mounting method, and exposure record all affect how the result should be interpreted. HovoyPetro supplies standard and custom specimens for monitoring programs aligned with ASTM G1 and NACE SP0775.
The most useful result begins with a defined alloy, prepared surface, installation position, exposure period, and post-exposure cleaning method.
Coupon types
Select geometry from the monitoring objective.
Holder interface and flow condition narrow the choice. Dimensions and mounting details are then confirmed against the monitoring plan.
02
Disc / Flush
Flush exposure where intrusion into the process stream must be minimized.
Circular disc with insulated center mounting
03
Cylindrical
Higher exposed area in compact holders and selected high-velocity services.
Solid or hollow cylindrical geometry
04
Erosion / Specialty
Directional flow, erosion-corrosion, biofilm, or project-specific studies.
Geometry and mounting pattern defined by the test plan
Selection sequence
Define the specimen before defining the quantity.
01
Match the monitored alloy
Select a coupon chemistry representative of the pipe, vessel, weld, or alloy under evaluation.
02
Set the exposure geometry
Choose strip, disc, cylindrical, or specialty geometry for the holder and flow condition.
03
Define the prepared surface
Specify finish, dimensions, insulation, and any orientation or edge requirements.
04
Preserve traceability
Record initial mass, dimensions, material identity, serial number, and exposure dates.
Technical specification
Standard supply range
| Coupon Types | Weight loss (flat/strip), disc (flush), cylindrical, erosion, biofilm |
|---|---|
| Standard Dimensions | Strip: 75×12×1.5 mm / 3"×0.5"×0.06". Disc: 25 mm dia. Custom on request. |
| Surface Finish | 120-grit (standard), 240, 320, 600-grit |
| Operating Limits | Defined by coupon alloy, holder, insulation, and actual process conditions |
| Identification | Stamped serial number or laser engraved |
| Packaging | VCI anti-corrosion paper, individually wrapped |
Preparation & traceability
Every exposed surface needs a known starting point.
Initial mass, dimensions, finish, material identity, and serial reference establish the baseline for later weight-loss analysis.
- Unique serial identification
- Initial mass and dimensional record
- Material certificate when specified
- Surface-finish and preparation record
- Individual moisture-barrier packaging
Reference data
Materials, standards, and service environments
Available materials
- Carbon Steel (A36 / 1018 / 1020)
- Stainless Steel 304 / 316 / 316L
- Duplex 2205
- Hastelloy C276
- Alloy 20
- Monel 400
- Inconel 625
- Custom alloys on request
Applicable standards
- ASTM G1-25 — Preparing, Cleaning, and Evaluating Corrosion Test Specimens
- ASTM G16-13 (2024) — Applying Statistics to Analysis of Corrosion Data
- NACE SP0775-2023 — Preparation, Installation, Analysis, and Interpretation of Corrosion Coupons
- NACE TM0169-2021 / ASTM G31-21 (2025) — Laboratory Immersion Corrosion Testing
Applications
- Oil and gas production pipelines
- Water injection and disposal systems
- Refinery process units
- Water treatment and desalination plants
- Chemical processing plants
- Power generation cooling water circuits
Complete monitoring assembly
Connect the coupon to the access system.
Pair the selected specimen with the holder, access fitting, and retrieval method required by the operating pressure and maintenance plan.
01Access FittingsPressure-rated fittings that allow safe installation and retrieval of corrosion coupons and probes without shutting down the process.↗02Coupon Holders & RacksHolders and racks that securely position corrosion coupons in the process flow for accurate, repeatable corrosion measurement.↗03Retrieval ToolsPurpose-built tools for safe insertion and retrieval of coupon holders and probes through access fittings without process shutdown.↗
Technical guides
Plan the exposure and analysis.
Corrosion coupon enquiry
Send the alloy, geometry, finish, and quantity.
We will confirm the coupon configuration, documentation scope, packaging, and production lead time.
Request a quotation