TPS (tubular pipe sleeve) coatings are widely used in the pipeline industry for their excellent corrosion resistance and durability. TPS shrink sleeves are especially well-suited for harsh environments, such as those encountered in oil and gas pipelines. In this article, we will examine the reliability of TPS coatings based on the product thickness and properties of TPS coating.
Product Thickness:
The thickness of a pipeline coating is an essential factor in determining its effectiveness. The thickness of TPS coating can be measured in four different ways: backing as supplied, backing fully free recovered, adhesive as supplied, and wear cone (including coating) as supplied. Based on the data provided, the backing as supplied has a thickness of 1.85 mm (0.073 in.), while backing fully free recovered has a thickness of 2.3 mm (0.091 in.). The adhesive as supplied is 1.2 mm (0.047 in.), and the wear cone (including coating) as supplied is 3.05 mm (0.12 in.). This thickness provides a reliable barrier to prevent corrosion and other damages to the pipeline.
Product Properties:
The properties of a pipeline coating determine its resistance to various environmental factors. TPS coating exhibits excellent properties that make it a very reliable coating for pipelines. Let's examine each of these properties in detail.
Backing Bursting Strength: The backing bursting strength of TPS coating, as per DIN 30672, is 2350 N. This property indicates the strength of the TPS coating to withstand high-pressure situations.
Adhesive Softening Point: The adhesive softening point, as per ASTM E-28, is 94°C (201°F). This property indicates the temperature at which the adhesive will start to soften. This high softening point ensures that the TPS coating remains intact, even at high temperatures.
Lap Shear: The lap shear test as per EN 12068 @ 10mm (0.40")/min indicates the strength of the adhesive in the TPS coating. The typical value for lap shear is 0.55 N/mm² @ 50°C (122°F), indicating a strong bond between the adhesive and the pipe.
Sleeve Peel to Steel: The peel strength of TPS coating to steel, as per EN 12068 @ 10mm (0.40")/min, is 18 N/mm. This property indicates the strength of the TPS coating to remain attached to the pipe even in extreme environmental conditions.
Specific Coating Resistance: The specific coating resistance of TPS coating, as per DIN 30672, after 100 days of immersion, is 6 X 108 Ωm². This property indicates the resistance of the TPS coating to electrical current flow.
Impact Resistance: The impact resistance test as per EN 12068, Class C indicates the ability of DIRAX TPS coating to withstand impact forces. The TPS coating passes the test for a 15 J impact force.
Penetration Resistance: The penetration resistance test as per EN 12068, Class C50 indicates the ability of the TPS coating to resist penetration by sharp objects. DIRAX TPS coating has a penetration resistance of more than 0.6 mm at 50°C (122°F).
Cathodic Disbondment: The cathodic disbondment test as per EN 12068 for 30 days indicates the ability of DIRAX TPS coating to resist the disbondment of the coating from the pipe. The TPS coating maintains an 8 mm radius at 50°C (122°F), indicating its excellent bonding strength.
Based on the thickness and properties of TPS coating, we can conclude that it is a proven and excellent pipe coating for most standard pipeline applications.
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