| 摘要 |
FIELD: oil industry. ^ SUBSTANCE: heat insulated pipe has coaxial inner and outer pipes mounted to form the pressure-tight ring space between them. The space receives heat insulation and is evacuated. The both ends of the outer pipe is provided with a thread. The coupling provided with an insulating insert is screwed on one end. The insert is made of outer plastic bushing and inner metallic bushing. The outer plastic insert is composed of two members. The inner metallic insert is divided into two parts interconnected through a threaded joint provided on the end made of a collet. ^ EFFECT: improved heat insulation. ^ 3 cl, 3 dwg |
