Description

What Problem Does an LPR Probe Solve?

When a pipeline carries untreated sour gas, internal corrosion thins the wall silently. Operators discover metal loss only at the next shutdown, after leaks or integrity failures. Waiting months for coupon weight-loss data leaves the asset unprotected between inspections.

Q: How do I get an instant corrosion rate instead of waiting for coupons?

A: A Linear Polarization Resistance probe measures the electrochemical response between two electrodes. It applies a small 10-20 mV polarization and uses the Stern-Geary equation to convert current into a corrosion rate. The LPR probe delivers that reading within minutes, so operators tune inhibitor dosing before damage occurs.

Technical Parameters

EMT builds every LPR probe to ASME B16.5 with full material traceability and NACE MR0175 compliance. The table below lists standard specifications; custom lengths and alloys are available on request.

Parameter	Specification
Measuring Method	Linear Polarization Resistance (Stern-Geary equation)
Electrode Configuration	2-electrode (double) and 3-electrode (triple)
Element Geometry	Flush-mounted and projecting types
Probe Body Material	316L Stainless Steel (ASTM A479 UNS S31603)
Optional Alloys	Duplex UNS S31803, Super Duplex UNS S32760, Inconel 625 UNS N06625
Sour Service	NACE MR0175 / ISO 15156 compliant
Pressure Rating	1500 psi retractable; up to 3600 psi retrievable
Connector Rating	Glass-sealed electrical connector, 6000 psi backup seal
Process Connection	NPT male; flanged 150/300/600LB RF ASME B16.5; socket weld
Probe Length	18″, 24″, 30″, 36″ (custom on request)
Response Time	Corrosion rate within minutes (instantaneous)
Certifications	ASME U-Stamp, EN 10204 3.1 / 3.2, ISO 9001

*Standards reference: [NACE MR0175 / ISO 15156 Sour Service] Related monitoring hardware: Corrosion Coupons and ER Probes.

Product Advantages

• Instantaneous reading— Delivers a corrosion rate within minutes, not the weeks a weight-loss coupon needs
• Replaceable electrodes— Field-swappable elements restore measurement without special tools or a new probe body
• Sour-service materials— 316L, duplex, and Inconel 625 bodies meet NACE MR0175 / ISO 15156 for H₂S service
• High-pressure retrieval— Retractable and retrievable designs insert or remove at full line pressure up to 3600 psi
• Pipe-matched elements— Electrodes in the same alloy as your line give a true, representative corrosion rate

Where Is an LPR Probe Used?

A Linear Polarization Resistance probe fits almost any water-based, corrosive environment where instant rate data protects the asset:

• Onshore oil and gas pipelines— Continuous corrosion-rate tracking on trunk lines and gathering systems
• Sour gas processing— Real-time monitoring under NACE MR0175 H₂S service conditions
• Offshore platform water systems— Instant feedback on oxygen-scavenger and inhibitor performance
• Refinery process units— Early detection of corrosion upsets in acidic or alkaline streams
• Cooling water and boilers— Trend-based dosing control to cut chemical waste
• Chemical processing plants— Monitoring in aqueous, corrosive process environments
• Pipeline integrity programs— Pairing LPR with coupons and ER probes for full coverage

About EMT

EMT is a Shenyang-based manufacturer of oil and gas pipeline accessories with 30+ years of engineering experience in corrosion monitoring.

Capabilities:

• 5-axis CNC machining and ASME Section IX welding workshop
• NDT: ultrasonic (UT), dye penetrant (PT), radiography (RT), magnetic particle (MT)
• Corrosion probe assembly with glass-sealed connector tested to 6000 psi
• Engineering support in English, Arabic, Spanish, and Chinese

Certifications: ASME U-Stamp, ISO 9001 quality system, NACE MR0175 / ISO 15156 sour service compliance, EN 10204 3.1 / 3.2 mill certificates.

Service: Ships to 30+ countries with standard lead time 4-6 weeks and custom orders 6-10 weeks. Field engineers provide installation guidance on request.

Exhibitions

EMT regularly exhibits at major oil and gas events worldwide:

• ADIPEC 2024, Abu Dhabi, UAE (November 2024)
• NACE Corrosion 2025, Houston, TX, USA (March 2025)
• OTC Asia 2025, Kuala Lumpur, Malaysia (March 2025)
• Hannover Messe 2025, Hannover, Germany (April 2025)
• Oil & Gas Asia 2025, Kuala Lumpur, Malaysia (September 2025)

Visitors can review the LPR probe range, request samples, and discuss project specifications with the engineering team on-site. Pre-show meeting requests can be sent via the contact page to schedule dedicated engineering time.

Customer Cases of LPR PROBE

> Anonymized at buyer request. Industries, regions, and applications are public; project details are not.

• Saudi Aramco-type operator, Saudi Arabia — 40+ LPR probes with 316L stainless steel bodies and carbon-steel elements for a sour gas trunk line (NACE MR0175 compliant). Retractable models gave instant corrosion-rate data without planned shutdown; delivered 2025.
• Anonymized North Sea operator, UK / Norway sector — Projecting triple-electrode LPR probes on a water injection system operating at 1500 psi. Pipe-matched elements tracked inhibitor performance in real time and cut chemical waste; delivered 2024.
• Middle East gas pipeline operator, UAE — Duplex-body retrievable LPR probes for cross-country transmission at 3600 psi. Units were coupled with corrosion coupons for full integrity coverage; delivered 2025.

Frequently Asked Questions

Q: What does an LPR probe measure?

A: An LPR probe measures instantaneous corrosion rate inside a pipe or vessel using the Stern-Geary equation, giving a reading within minutes.

Q: How is an LPR probe different from a corrosion coupon?

A: A coupon shows metal loss after weeks. The LPR probe delivers a real-time rate in minutes, enabling immediate inhibitor dosing.

Q: Can the probe be installed under pressure?

A: Yes. Retractable and retrievable LPR probes insert or remove at full line pressure up to 3600 psi with proper access fittings.

Q: Which materials suit sour H₂S service?

A: EMT builds bodies in 316L, duplex, super duplex, and Inconel 625. All sour-service alloys comply with NACE MR0175 / ISO 15156.

Q: What certifications back the build?

A: EMT holds ASME U-Stamp certification and issues EN 10204 3.1 or 3.2 certificates. NDT covers UT, PT, RT, and MT.

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