-
Categories
-
Pharmaceutical Intermediates
-
Active Pharmaceutical Ingredients
-
Food Additives
- Industrial Coatings
- Agrochemicals
- Dyes and Pigments
- Surfactant
- Flavors and Fragrances
- Chemical Reagents
- Catalyst and Auxiliary
- Natural Products
- Inorganic Chemistry
-
Organic Chemistry
-
Biochemical Engineering
- Analytical Chemistry
-
Cosmetic Ingredient
- Water Treatment Chemical
-
Pharmaceutical Intermediates
Promotion
ECHEMI Mall
Wholesale
Weekly Price
Exhibition
News
-
Trade Service
Inspection site
Figure one
In the previous field inspection case analysis, I have shared the principle of pulse eddy current detection for many times.
I will not introduce it this time.
If you have any questions , you can refer to the previous case
.
For galvanized iron-clad pipes, the coating thickness is about 60 mm, the pipe material is carbon steel, the pipe diameter is 600 mm, and the nominal wall thickness is 8.
7 mm
.
The device in the detection area of the station has been in operation for a long time, and the on-site detection requirements
Use pulsed eddy current to sample a circle every 1m, and take 12 points in one circle, for a total of 160m
.
80 laps of data need to be collected, and a total of 960 data points are collected
Before the start of the inspection, our company's R&D team upgraded the software, with more stable data and faster inspection speed
.
Going to the site is not only a service, but also an evaluation of the updated software
" > Start testing
On-site inspection is performed in groups of two persons.
After simply setting the parameters, we can perform quick inspection after calibration on the outside of the pipe coating, and judge the corrosion status of the pipe wall by comparing the percentage of wall thickness change
.
In the process of on-site inspection, we received strong support and assistance from the owner.
In the morning inspection, we found some corrosion thinning areas.
The thickness of these areas did not change much, and the results were consistent with the results of the owner's ultrasonic thickness measurement sampling
.
Due to the high speed of pulse eddy current testing, there is no need to dismantle the insulation layer, which reduces the cost of testing and the accuracy of testing results, which has won unanimous praise from the owner and the personnel of the testing company
" > problem found
At about 3 pm, we found a very serious area of suspected corrosion, and the detected thinning was nearly 30%
.
We didn't dare to take it lightly when we found such a large thinning signal.
Figure II
Schematic diagram of the distribution of detection points in the corrosion area
Figure 2 is a screenshot of the detection data.
The upper left corner of the detection interface shows the calibration curve and the measurement curve.
The smooth curve represents the true and reliable data.
The higher the curve overlap, the smaller the thickness change
.
The upper right corner shows the relative wall thickness, relative wall thickness percentage and thickness change percentage
Figure three
Figure 3 shows the pipe photos and the thickness measurement photos of the thickness gauge taken on-site after the coating is peeled off
.
The thickness gauge re-examination confirmed that the change trend of corrosion thinning is consistent with the pulse eddy current test results.
" > to sum up
As an on-site inspector, I am very proud! Beijing Delang's independent research and development and domestically produced pulse eddy current products found major defects for Party A during the inspection process, eliminating hidden dangers for the safe operation of the device
.
From the previous inspection of Shell cryogenic spherical tanks in the Daya Bay Petrochemical Zone, it was necessary to dispatch foreign technicians to operate an imported brand with a large wall thickness.
As an on-site inspector, there is nothing more fulfilling than the discovery of potential safety hazards
.
As an instrument manufacturer, Beijing Delang is nothing happier than getting the recognition of customers
.
Delang pulse eddy current equipment will continue to grow in response to various complex working conditions, and provide a platform for everyone to experience domestic products and trust China's leading technology
.
