There is no doubt that for years, powder coating has remained among the most trusted methods of protecting steel products. This type of coating guarantees the strength and durability of the metal.
In the oil and gas industry, the coating is used on different oilfield equipment. Among them is the tubing.
Bottom powder coating is an enhanced method of the conventional powder coating. Additional compounds are added to enhance the effectiveness of the coating.
If you are looking for the best bottom powder coated tubing for a wellbore in China, spare a few minutes to read this guide. We will everything that you need to know about these oilfield equipments.
Definition of Bottom Powder Coated Tubing
Powder coating is the application of epoxy-laced powder or free-flowing powder on the steel tubing.
This is different from the liquid coating which is applied by an evaporating solvent. Powder coating is applied by using the electrostatic technique. Heat and ultraviolet radiation are used for curing the powder permanently to the tubing.
A thick layer of coating is preferred to pacify the protection on the tubing. Also, the finishing of powder coating is relatively harder and tougher than as compared to other types of coating.
Properties of Bottom Powder Coating Tubing
To understand the effectiveness of powder-coated tubing, It is important that you know the key features that characterize this type of coating.
One of the most distinct property is it results in a thick coating than most alternative coatings. This is because powder coating does not have liquid elements hence no issues of sagging once it has been applied onto the tubing.
Another feature of this oilfield tubing is all the surface has an impeccable uniformity. Still, this is because the carrier fluid does not evaporate from the surface of the tubing metal.
The coated tubing has a desirable surface texture which is preferred and applicable in most oilfield applications. Even though it may not be extremely smooth, you will still be able to appreciate it.
It is possible to recycle and even amend the mistakes on the powder coating tubing.
Bottom powder coating is slightly different from the normal powder coating. One of the differences is that there is the involvement of liquid coating which enhances the adhesive force between the coating and the steel tubing.
This explains why it is also referred to as liquid-surface powder-coated tubing.
The use of liquid epoxy polymer as a bottom layer of the coating enhances the bonding capability of the coating with the steel tubing.
On the other hand, the use of solid epoxy polymer which is applied with the help of heat increases the resistance of the coating to chemicals such as acid and alkali.
Anti wax and other abrasive materials are added to improve the resistance of the coating to scratch and even impact pressure.
How is Bottom Powder Coated Tubing Manufactured
The manufacturing of bottom powder coated tubing entails an elaborate process that is aimed at improving the features of the tubing.
Like other types of coating, the first step involves cleaning the tubing. Oil, dirt, oxidants, and other impurities are removed so that they don’t interfere with the bonding between the steel and the coating.
Chemical treatment and sandblasting are other methods that are used to clean the tubing surface in readiness for the application of the coating.
Once the surface is clean and ready, we proceed with the bottom powder application.
An electrostatic gun is used for spraying the dry solid epoxy macromolecule. This gun uses both the heat and pressure to spray out the polymer at a maximum force so that it forms a permanent bond with the metal.
Another common method for the application of the coating is known as electrostatic fluidized bed coating. This technique is usually used on the liquid epoxy polymer.
This method is the same as the traditional fluidizing process only that here the epoxy molecules are are the bottom. The steel substrate is charged and the epoxy particles will be attracted to it creating a permanent bond.
Once the whole tubing has been coated with the epoxy polymer coating, the next stage is the curing process. The coating is exposed to different conditions.
Some of these conditions include high temperatures and UV rays. From this stage the tubing will have proven beyond that it can be used in any oilfield.
Bottom Powder Coating Tubing Quality Test
As a reputable bottom powder coated tubing manufacturer, we subject the tubing to quality and assurance test procedures. These tests are tailored to ensure that product meets the ultimate requirement.
One of the tests is known as Autoclave or Type test. In these tests, three key parameters of the tubing are tested. These are temperature, pressure, and liquid phase.
The tubing remains intact at the temperature of 148℃ and the pressure of 70MPa.
We also test the acid resistance of the powder-coated tubing to acid and other chemicals and if the results are positive, we supply them to our clients.
All our tests are done according to different international standards which include:
NACE TM 0185, ASTM D714 BS EN10289 ISO 2812-1, ASTM D714 among others.
This is done to ensure that the quality of the tubing does not compromise with your oil recovery process.
Bottom Powder Coated Tubing Manufacturer in China
Looking for quality bottom coated tubing in China?
Be careful on where to buy from to avoid ending up with low-quality oilfield equipment.
Buy from reputable manufacturers and suppliers as this will improve your chances of getting quality products.
SanJack Petro is one of the reliable bottom powder-coated tubing manufacturers that you can choose in China.
We design and manufacture coated tubing that will meet your oilfield recovery goals.