Description

What Is a Corrosion Coupon Holder?

A corrosion coupon holder is the assembly that suspends a metal coupon inside a live pipeline to measure internal corrosion by weight loss. EMT builds strip, multihole strip, and disc holders that insert through a standard 2-inch access fitting on crude oil, natural gas, water injection, and chemical lines. Operators install the assembly at wellheads, separators, and pump stations where wall thinning drives integrity risk. A strip coupon holder mounts one or two coupons on a single tongue; a flush disc coupon holder sits level with the wall to watch localized attack. EPC contractors and pipeline operators use the unit to set a corrosion baseline, tune inhibitor dosing, and plan inspections. The coupon shares your pipe alloy and sees the same flow, pressure, and chemistry as the wall. This gives a true, representative read of line corrosion under operating conditions. EMT also supplies a multi-coupon corrosion coupon rack.

What Are the Key Parameters?

We size each holder to line pressure, medium, and coupon type. Our standard build covers SS316 and 316L bodies with lengths of 18, 24, 30, and 36 inches, and a 1-inch full-port valve for retractable service. The table lists core specifications we keep in stock. We also offer custom NPT or BSPT threads and exotic alloys such as Monel or Inconel. Every order ships with a material certificate and a factory test report. Share your line size, pressure, and coupon style, and we confirm the exact build. Drawings follow your access-fitting standard so the holder drops in without field modification. Common sizes stay in stock for fast turnaround. Custom seals and high-temperature builds keep severe-service jobs on one plan. Removable versions allow coupon change under pressure through an isolation valve, cutting downtime during surveys.

Parameter	Value
Holder material	SS316 / 316L (Monel, Inconel on request)
Coupon types	Strip, multihole strip, disc
Pressure rating	Up to 1500 PSI (10.3 MPa)
Temperature	-20 to 260°C (500°F); 538°C (1000°F) option
Standard lengths	18 / 24 / 30 / 36 inch
Connection	¾ in NPT threaded, 1 in full-port valve
Coupon alloy	316L, 304, 410, Inconel, per request
Seal	Dual O-rings, Ra ≤ 0.8 μm finish
Standards	NACE SP0775, MR0175

How Does the Corrosion Coupon Holder Work?

The corrosion coupon holder works by exposing a reference metal sample to the live process stream. Crews thread the holder into the access fitting and set the insert depth so the coupon sits at the top, middle, or bottom of the bore. In a retractable build, a packing gland and a full-port valve let the holder slide out under pressure; a locking device and safety cable stop blowout during withdrawal. The coupon sees the same flow, pressure, and chemistry as the pipe wall. After the exposure period, operators retrieve the coupon, clean it per ASTM G1, and weigh it. Weight loss over time gives the corrosion rate in mpy or mm/y. A flush disc holder watches wall-localized attack; a strip holder gives a broad-flow reading. EMT sets the coupon depth to your exact monitoring point, so the data reflects true line conditions.

Why Choose the Corrosion Coupon Holder?

Five reasons operators specify EMT’s corrosion coupon holder:

• It gives a direct, true corrosion rate by weight loss under real flow.
• The retractable coupon holder withdraws under pressure, so the line stays online.
• Dual O-rings and NACE MR0175 materials suit sour, hot, high-pressure service.
• Strip, multihole, and disc coupons match your pipe alloy for a representative read.
• SS316/316L bodies and a pressure-test certificate back every shipped assembly.

EMT tunes length, thread, and coupon alloy to your exact duty. A corrosion coupon rack option compares multiple alloys at one station. Spare holders and O-ring kits keep multi-point surveys on one delivery plan. Our engineers help you pick the position and depth before you order, so the first run yields usable data. Field reports from each site feed our next design update, so the holder keeps improving.

Who Is EMT and Why Trust Us?

EMT designs and manufactures pipeline integrity and pigging equipment from its Shenyang production base, holding the ASME U Stamp for certified pressure-vessel manufacturing. Our workshops run CNC machining centers, automatic welding stations, and a dedicated hydrostatic test bay that govern quality from raw stock to finished shipment. We pressure-test every holder before dispatch and enclose a test certificate with each consignment for full traceability. Pipeline operators, EPC contractors, and maintenance teams in over 30 countries deploy our equipment worldwide. We plan around tight commissioning windows and offer expedited delivery when schedules are critical. Our support engineers answer in English, Spanish, Russian, or Chinese within four working hours. Alongside coupon holders, we build QOC quick-opening closures, corrosion monitoring systems, chemical injection quills, and pipeline cleaning pigs. We deliver turnkey pigging and monitoring solutions from design through commissioning. As one single-source partner, we cover your full scope under a single quality standard.