Insulated elbows are a type of thermal insulation pipe fittings, composed of a high-density polyethylene jacket, polyurethane foam insulation layer, and a tightly bonded inner working steel pipe. Insulated elbows are primarily used for the bends in insulated straight pipes, usually paired with insulated pipelines. They are designed to compensate during the pipeline design of thermal insulation projects, ensuring that the elbow sections also possess adequate insulation properties. Standard elbow angles: 30 degrees, 45 degrees, 60 degrees, 90 degrees.
Insulated elbows are widely used in the transmission networks for liquids and gases, in thermal insulation projects for chemical pipelines, oil and chemical industries, centralized heating networks, central air conditioning ventilation pipelines, and pipeline bends in municipal engineering projects. Insulated pipes (including elbows, tees, and crosses) are high-performance, safe, and cost-effective pre-fabricated buried thermal insulation pipes. They effectively address issues such as thermal insulation for pipes in heating, cooling, power, and chemical engineering projects, insulation of elbows, sliding lubrication, protection of exposed pipe ends, and waterproofing and corrosion prevention at bends.
Insulated elbow structure:
High-density polyethylene (HDPE) anti-corrosion coating: HDPE pipes protect elbows from corrosive substances and plant corrosion, extending the service life of pipe fittings. It supports the working pipe and can withstand certain external loads, ensuring the normal operation of the working pipe.
2. Polyurethane Foam Layer: Withstanding high temperatures, ensuring medium temperature, maintaining the outer sheath surface at a constant temperature, insulating internal working pipes, and ensuring the foam is not carbonized.
3. Working Steel Pipe: Ensures normal flow of conveying medium.
Construction Notice:
1. Avoid soaking in groundwater and rainwater during construction. If the end is accidentally soaked, dry it before connecting the outer sheath.
2. Pipe materials should be stored on a level site, neatly stacked, with a stacking height less than 1.5 meters.
3. Pipe materials must be lifted and placed gently, avoiding collisions and throws. It is prohibited to use steel wire ropes for direct lifting of the pipe body.
4. Insulation and anti-corrosion layers should be kept away from direct flame contact. For on-site installation, follow the following procedure: excavation of the pipe trench - base treatment (drainage, sand bedding) - laying pipes - steel pipe welding - inspection (hydrostatic test) - installation (pressure test) - foaming - sealing foam holes. Personnel can be dispatched to the construction site for the insulation work on elbows and joints, including the installation of the joint sleeve, connection and sealing of the joint sleeve to the main pipe, and foaming of the on-site joints. However, this does not include the welding work on the steel pipe sections of the joints.
