CASE STUDY
Denso Petrolatum Tape System Protects Arco Pipeline at Soil-to-Air Interface
Exposed Surface Coatings
Project Data
| Location | Houston, TX |
| Completion | N/A |
| Project Type | Soil-To-Air Pipeline Protection |
| Products Used | Denso Paste / Densyl Tape / Glass Outerwrap |
| Contractor or Applied By | Arco Pipeline |
Project Details
Norpoint Sandblasting & Painting Ltd in Edmonton, Alberta has been a long time Denso Approved Application Company. They required a coating system resolution for the Installation of Skin-Type Resistance Temperature Detectors (RTDs) on several 36″ pipeline mainline block valve assemblies. The RTDs are used to detect temperature fluctuations within higher temperature pipelines. Most RTD elements consist of a length of fine coiled wire wrapped around a ceramic or glass core. The element is usually quite fragile, so it is often placed inside a sheathed probe to protect it. The RTD sensor is attached to the surface of the pipe and will be buried with the assembly. Corrosion and environmental protection is required to ensure the RTD operates properly during its service life. This required a specialized coating system to coat and protect these RTDs for long term performance. The coating scope of work was that the entire block valve and pipe spool assembly was first abrasive blasted to a SSPC-SP10 Near-White Metal with a 2.5 to 5 mil profile. Denso Protal 7250 Spray Epoxy was then applied at 25-35 mils DFT over the entire below ground section of the block valve and pipe spool assembly. The RTD sensor was then attached to the surface of the pipe. The entire area was then coated with a thin layer for Denso Paste HT. Then the RTD is encapsulated with a layer of Densyl Mastic. This would assure there were not any voids or cavities left around the RTD. Denso Hotline Tape was then applied with a 55% overlap around the entire circumference of the pipe. This would ensure the long term sealing of the area around the RTD. The entire area was then wrapped with Denso Glass Outerwrap to give mechanical protection to the entire assembly. The entire valve assemblies were then ready to be shipped to site for final installation. The End User that required these block valve and pipe spool assemblies appreciated the fact that Denso North America was able to offer the entire solution for coating these RTDs.
Denso Glass Outerwrap is easily applied by hand and requires no special training or equipment.
Denso Glass Outerwrap, which is resistant to water, acid, salts and soil organics.
Denso Glass Outerwrap is a protective coating which offers exceptional mechanical and impact strength for underground and above ground pipes.
Denso Glass Outerwrap is easily applied by hand and requires no special training or equipment.
Denso Glass Outerwrap, which is resistant to water, acid, salts and soil organics.
