Steel pipes are often used to carry oil and gas. Sometimes not only the anti-corrosion function but also the fire protection function is needed. We know that there are two main types of fire-resistant coatings at present, one is a thick fire-resistant coating and the other is an intumescent fire-resistant coating. Let's take a brief look below.
The main feature of the thick fire-resistant coating is that coating thickness measured by the paint thickness tester is large enough. The main principle is to use the fire-resistant coating of large thickness to flame retard. The characteristic of the intumescent fireproof coating is that coating thickness is relatively small when measured by a paint thickness tester. When a fire occurs, the intumescent fireproof coating will expand and thicken in a high temperature environment and there will be a lot of paint. The substrate is protected through these holes.
But what is the relationship between coating thickness and the temperature inside the steel tube? Due to the special structure of steel pipes, the fire protection of steel pipes is mainly divided into passive and active types. For indoor steel structures, we generally use intumescent fire-resistant coatings. For outdoor fire protection coatings, we generally use non-intumescent fire protection coatings. "Fireproof coatings for steel structures" stipulates that the fireproof coating of steel is generally 7-45mm, but there are no clear regulations on fireproof coatings during the construction of steel fireproof coatings.
Although the fire-resistant coating has a protective effect on steel, its protective strength will decrease as the fire-resistant coating thickens. Because if the fire-resistant coating is too thick, it will cause the coating to fall off. Therefore, we cannot increase the fire resistance by increasing coating thickness. Therefore, we should choose a coating with a lower thermal conductivity when selecting a fire-resistant coating.
It is recommended to use Linshang LS223 paint thickness tester when measuring the fire-resistant coating thickness on steel pipes. This paint thickness tester uses magnetic and eddy current thickness measurement principles. It adopts the split design of the probe and the host. You can view the measurement data while measuring. It is easy to carry with compact design. And the instrument can be used in both laboratory and engineering field. The Linshang paint thickness tester meets the following standards:
★ "GB / T 4956-2003 Non-magnetic coating thickness measurement on magnetic substrate-magnetic method"
★ "JJG-818-2005 Verification Regulations for Magnetic and Eddy Current Cover Thickness Measuring Instrument"
★ "DIN EN ISO 2808 Determination of film thickness of paints and varnishes"
★ "GB / T 4957-2003 Non-conductive coating thickness measurement on non-magnetic base metal-Eddy current method"
Linshang paint thickness tester will make your measurement more convenient!