Corrosion Probe and Coupon

Description

Corrosion Probe and Coupon Usage Scenarios

Because the petrochemical industry has a complex and changeable corrosive environment. (Oil-water mixing, gas-liquid mixing, etc.). There are also various types of corrosion. (Uniform corrosion, localized corrosion, erosion corrosion, pitting corrosion, pitting corrosion, etc.). So when addressing these issues. How to quickly (real-time) discover corrosion problems and accurately grasp the corrosion status (location, degree). This has always been the technical focus of petrochemical enterprises. At the same time, it is also the direction that domestic and foreign technicians have been working hard to study.

Therefore, the company produced this series of resistance corrosion probe products. It enables technological innovation in corrosion monitoring. At the same time, it realizes real-time online monitoring of pitting corrosion and localized corrosion, specifically including 3 types of products

PDS: Pitting Corrosion Monitoring System (patented technology) i-ER: ER resistance corrosion monitoring system based on AI technology MFS: Multifunctional Corrosion Monitoring System (PDS + i-ER)

Metal Material: 316、L DUPLEX SS
Sealing Material: Teflon/ Fluororubber
Working Temperature: -20~200℃
Working Pressure: 0~26MPa
Access Fitting Body and Protective Cover :
Size of Flange : ANSI 2″ RF (or RJ)
Material : CS 、316L、 DUPLEX SS
Working Pressure: 0~26MPa
Working Temperature: -20~200℃

Product advantages

1. We can use it under any environmental conditions

2. Adapt to various standards on the market (ER probes, weightless coupons. ) The change of site conditions at the installation interface does not affect the continuity of monitoring

3. Real-time pitting corrosion/general corrosion/pitting corrosion penetration

4. Rate monitoring;

5. Pitting corrosion alarm display

6. ER probe life signal display

Introduction:

In aggressive media, the wire as the measuring element will corrode. Then, the length of the wire remains the same, the diameter decreases, and the resistance increases. At this time, we can convert the corrosion and thinning amount of the metal wire by testing the change of resistance. When the material of the metal wire used is the same as that of the equipment to be measured, the corrosion rate of the metal wire can be used to approximately represent the corrosion rate of the equipment. The resistance probe measurement technique is based on the above principles for testing. Establishing the resistance probe measurement method can display the corrosion condition of the equipment pipeline in time. At the same time, it can detect abnormal corrosion conditions in time to avoid safety production conditions caused by equipment corrosion. This is an effective means of corrosion detection.

Working principle:

The corrosion rate measured by the resistance probe is based on the linear relationship between the cross-sectional area and the resistance at any time, under the premise that the length of the resistance probe wire is constant, to obtain the metal corrosion rate. At the same time, in order to eliminate the measurement error caused by temperature. Then we added a temperature compensation element to the measurement structure.
For example, the cross-sectional area of a metal material with a certain length decreases after corrosion and thinning, and the resistance value increases. Therefore, as long as the change value of the resistance is known. We can calculate the thinning amount.

Measurement system:

The Corrosion Probe and Coupon monitoring system consists of several parts. Examples include corrosion resistance probes, fasteners, corrosion data collectors, connecting cables. There are also data converters, computers, and online monitoring software systems.

• Resistance probe:

High-temperature Corrosion Probe and Coupon, including protective cap, measuring element, probe rod, and signal interface.

Since the resistivity of metal materials changes with temperature, in order to avoid measurement errors caused by medium temperature changes. Then, a temperature compensation element is built into the probe rod and connected in series with the measuring element in the circuit, so that the influence of temperature can be completely eliminated. The protective cap is on the outside of the probe to slow down the impact of high-speed medium flow on the probe measuring element. The card slot is to connect and fix the dismounting device when installing and dismounting the probe.

ER Corrosion Probe and Coupon

Because the key to the development of high-temperature resistance probes is the sealing of the probe and the insulation of the inner leads. So they are sintering at a high temperature above 1000°C. The inner lead wire of the probe rod is insulated with a porcelain sleeve. All joints are laser connection wel. Install the sealed probe in a self-made simulated working condition device. The conditions are 450°C, 2.0MPa, and sulfur-containing diesel oil. After 72 hours, leakage no found. The sealing and high-temperature resistance of the probe can meet the design requirements.

In addition, in order to improve the pressure resistance performance, the sealing packing part of the probe is designed as a spiral inner sleeve base. The measuring element is made in the form of a filament.

Compared with flakes, its advantages are:

One is long life. Secondly, the surface of the filamentary measuring element is relatively uniform. So this is not prone to edge effects like chip measuring cells. From the perspective of use and installation, the probe has two forms: detachable under pressure and flange. Generally speaking, the former is suitable for environments where the pipeline pressure is less than 2.0MPa. The latter is suitable for environments where the pipeline pressure is greater than 2.0MPa.

• Monitor:

(1) Remote acquisition, amplification, and digital conversion of weak signals:

Petrochemical equipment operating above 300°C is potentially dangerous due to corrosion. Field testing should be done away from the danger zone. Previously known resistance probe testers. (Including the early imported ER8000 and domestically developed). The lead wire between it and the probe is very short, only 1~2m. To avoid operating in high temperature areas. Therefore, the design of RPM-1511 instrument adopts independent differential amplification and filter noise reduction technology of measuring element and temperature compensation element. This enables measurement leads up to 50m or more. It also makes multi-probe measurements possible with one instrument. After the original signal is collected and amplified, the analog-to-digital conversion is performed, and the operation, display, and storage are completed by the single-chip microcomputer.

(2) Long-distance transmission of digital signals, computer software system design:

To perform real-time online measurements, the monitor must have the functions of automatic signal collection and transmission to the monitoring room. Computers are equipped with RS-232 standard communication interface. But its transmission distance is only 15m, which cannot meet the requirements for industrial sites.

In order to extend the transmission distance, an RS-485 interface module is connected between the on-site monitor and the RS-232 of the computer in the monitoring room. The corresponding circuit MAX487 is also designed in the monitor. It makes the original signal transmitted in the form of potential into the form of current loop transmission. The transmission distance reaches 1200m, which meets the needs of the scene. Computer software system design is also required for online measurement. The monitoring program of the corrosion online monitoring system is written using the Visual Basic software platform. This fulfills the requirements of a clear interface, easy operation, standardized data management, etc.

Application prospects:

Corrosion Probe and Coupon measurement can track the corrosion behavior of the metal surface in the real environment, and grasp the corrosion rate and corrosion status. Therefore, the corresponding process anti-corrosion measures are taken in a timely manner. Timely measures can also be taken to control the corrosion rate within the required range. Establishing the resistance probe measurement method can display the corrosion condition of the equipment pipeline in time. Or quickly spot corrosion anomalies. In this way, safety production situations caused by equipment corrosion can be avoided. So it is an effective means of corrosion detection. Then the design of the resistance probe measurement data processing software is simple and practical, and it can effectively manage the probe data. This improves the efficiency of data processing. It is convenient to query the corrosion data.

The development and application of the resistance probe measurement system have enriched the corrosion monitoring methods. At the same time, it fills the gap in the country. This provides favorable technical support for the safe operation of the equipment.

Firstly, the fastest feedback!

Secondly, the fastest delivery time.

At last, 24 hours,7 days online.

We use PLYWOOD CASE as packaging, it has the following advantages:

Firstly, lightweight, clear lines, insulation, high strength, not easy to deform;

Secondly, no fumigation is required.