Linde Polymer Tec Co.,Ltd. is one of the most experienced manufacturers and suppliers of high temperature hnbr oil production accessories seals ( flange connection seals ) in China, also supports customized service. Please feel free to buy high quality high temperature hnbr oil production accessories seals ( flange connection seals ) for sale here from our factory.
High temperature HNBR oil production accessories seals ( flange connection seals )
Products Description
1. Material properties
HNBR90 composition characteristics
HNBR90 refers to a material with an acrylonitrile content of about 90% in hydrogenated nitrile rubber. The high acrylonitrile content makes this material more oil-resistant. In the oil production environment, a large amount of crude oil, various lubricants, and possible chemical additives and other oily substances will come into contact with the seal ring. HNBR90 has good tolerance to these oily media, and it can prevent swelling caused by oil absorption, thereby ensuring the dimensional accuracy and sealing performance of the seal ring.
Compared with rubber with low acrylonitrile content, the volume change rate of HNBR90 in oily environments such as crude oil can be controlled at a lower level. For example, after being immersed in crude oil for a long time, its volume expansion rate may be less than 10%, while some ordinary rubbers may expand by 30% - 50% or even more, resulting in sealing failure.
High temperature performance
Resistant to high temperature environment .
During the oil production process, the underground temperature will increase significantly with the increase of depth. The underground temperature of some oil wells can reach 150-180℃. HNBR90 sealing ring can still maintain the elasticity of rubber at high temperature. Its glass transition temperature is relatively high, generally between 0-20℃, which makes it not easy to soften and lose elasticity at high temperature, resulting in sealing failure.
For example, when the pipe temperature rises from room temperature to 120°C, the flange spacing may increase by 0.1 - 0.2 mm due to thermal expansion. The HNBR seal can fill this gap through its own elastic deformation to maintain the seal .
For example, in downhole tool sealing applications at a temperature of 160°C, after long-term use, the elastic modulus of the HNBR90 sealing ring changes little and can continue to perform its sealing function effectively, while ordinary rubber sealing rings may harden or soften significantly due to high temperature, greatly reducing their sealing performance.
For example , during the steam stimulation process, the temperature inside the pipeline can reach about 180°C. The HNBR seal can continue to work to ensure the sealing of the flange connection and prevent the leakage of high-temperature crude oil and steam.
Chemical resistance
The oil production environment may contain corrosive gases such as hydrogen sulfide and carbon dioxide, as well as various acidic or alkaline chemicals. HNBR90 seal ring has a certain resistance to these chemicals. Its chemical structure enables it to remain relatively stable in an environment containing corrosive components, reducing the damage to the seal ring caused by chemical corrosion.
When exposed to crude oil containing a certain concentration of hydrogen sulfide (such as 100-500ppm), the HNBR90 sealing ring will not become sticky or cracked like some non-corrosion-resistant rubbers, thereby extending the service life of the sealing ring.
Oil resistance
Crude oil and various additives in the oil production pipeline will corrode the seals. High temperature HNBR seals have excellent oil resistance and will not swell or decompose due to long-term contact with crude oil. This ensures the dimensional stability of the seal in an oily environment, enabling it to effectively seal flange connections for a long time.
When the seal comes into contact with high-sulfur crude oil (sulfur content can reach 2-5%), the HNBR seal will not absorb the sulfur component in the crude oil and cause performance degradation, maintaining a good sealing state.
Products Features Description
Sealing ring design features(flange connection seals)
Sealing form and structure
HNBR90 oil production accessories seal ring can adopt a variety of sealing forms, such as O-ring, lip seal ring, etc. O-ring is a simple and effective sealing structure, which fills the sealing gap through its own elastic deformation. It is widely used in flange connection, valve seal and other parts of oil production equipment.
Flange connection sealing principle
Flange connection is achieved by fastening two flanges together with bolts and placing a seal between the two flanges. When the bolts are tightened, the flange exerts pressure on the seal, causing the seal to deform elastically and fill the tiny gap between the flange surfaces. During the oil production process, the fluid pressure in the pipeline will act on the seal, and the seal needs to resist this pressure to prevent fluid leakage.
Dimensional accuracy and adaptability
Due to the strict sealing requirements of oil production equipment, the dimensional accuracy of HNBR90 sealing rings is crucial. During the design and manufacturing process, the inner diameter, outer diameter, cross-sectional diameter and other dimensions of the sealing ring need to be accurately controlled according to the specific sealing parts and equipment requirements. Its dimensional tolerance can generally be controlled between ±0.05 - ±0.15mm to ensure good fit with the sealing surface.
Products Application advange
Application Advantages
High reliability: It can work stably for a long time in high temperature, high oil and corrosive environment, reduce the frequency of equipment maintenance and replacement of sealing rings, and improve the overall operation efficiency of oil production equipment.
Good compatibility: It is compatible with a variety of oil production equipment materials, such as metals (carbon steel, stainless steel, etc.), other engineering plastics, etc. When in contact with sealing surfaces of different materials, the HNBR90 sealing ring can effectively play a sealing role and will not be damaged due to chemical reactions between materials.
| Parameter category | Details |
| Dimensional parameters | Inner diameter (ID) range: a few millimeters to several meters (small oil production unit pipe flange seals may have an ID of 10-20mm, large oil pipeline flange seals may have an ID of 500-1000mm and larger) |
| Outside diameter (OD) range: usually 10 - 50mm larger than the inside diameter (e.g. a seal with an inside diameter of 50mm may have an outside diameter of 60 - 100mm) | |
| Thickness (or cross-sectional diameter) range: 3 - 20mm (3 - 8mm for low-pressure pipelines, 10 - 20mm for high-pressure or high-sealing requirements) | |
| Physical performance parameters | Hardness (Shore Hardness) Range: 60 - 90 Shore A (60 - 70 Shore A has good elasticity and compression set, 80 - 90 Shore A is more wear-resistant) |
| Tensile strength range: 10 - 30MPa | |
| Elongation at break range: 200% - 600% | |
| Heat resistance performance parameters | Long-term use temperature range: -40℃ to 180℃ |
| Short-term maximum temperature range: 200 - 230°C | |
| Chemical resistance performance parameters | Oil resistance: Excellent resistance to petroleum-based oils. The volume swelling rate after immersion in crude oil for 72 hours is generally less than 10%. |
| Acid and alkali resistance: The appearance and performance remain basically unchanged in acid and alkali environments with a pH value of 2-12 |
Products Precautions
Make sure the sealing surface is clean and smooth to avoid scratching the seal. At the same time, the installation process should be carried out according to the correct operating procedures to prevent the seal from being twisted or overstretched. For example, when installing an O-ring, use appropriate installation tools to avoid contacting the seal with sharp tools.
Storage conditions: During storage, avoid exposing the seal ring to strong light, high temperature, high humidity and chemical volatilization. Store it in a cool, dry and well-ventilated place and avoid placing it together with corrosive substances. Otherwise, the performance of the seal ring may be affected, and it may age or be damaged prematurely.
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