Insulated elbows are widely used in liquid and gas transportation pipelines, chemical pipeline insulation projects, petrochemical pipelines, centralized heating networks, central air conditioning ventilation pipelines, and municipal engineering pipelines at bends. Insulated pipes (including elbows, tees, and crosses) are a type of pre-fabricated buried insulated pipe with excellent thermal insulation, high safety reliability, and low engineering costs. They effectively address issues such as insulation, thermal insulation, sliding lubrication, exposed pipe ends, waterproofing, and corrosion prevention in various pipeline engineering applications, including heating, cooling, thermal power, electrical power, and chemical industries. These pipes not only offer advanced technology and practical performance that surpass traditional trench and overhead pipeline installations but also deliver significant social and economic benefits, along with directional transitions for insulated straight pipes.