Basic Introduction of General Knowledge of Polyurethane Direct Buried Thermal Insulation Pipe
The basic introduction of the knowledge of polyurethane direct-buried insulating pipe can be roughly divided into four types according to the structure and information attributes of the product. Shenyang Xinfa insulating pipe factory is summarized as follows.
1. Prefabrication of directly buried insulating pipes at low temperature according to the structure of insulating layer
(1) Single type: suitable for heating medium below 150X2, of which the ordinary type is suitable for heating medium below 120C, and the low-temperature type is suitable for heating medium between 120 and 150 C (recommended operating temperature below 140 to 2). The thermal insulation layer of this kind of insulating pipe is composed of a single thermal insulation material, rigid polyurethane foam, and the outer thermal insulation layer maintains the shell.
(2) Compound type: suitable for low temperature heating medium. The insulation layer of this kind of insulation pipe is composed of two kinds of insulation materials. Insulation layer, maintenance shell of insulation layer and task steel pipe through heat medium can not be bonded together firmly. The inner layer is a new type of low temperature and thermal insulation material, such as centrifugal glass wool felt, composite silicate and glass foam, and the outer layer is made of polyurethane rigid foam plastics.
2. Classification by Maintenance Shell Data
(1) High density polyethylene plastic (commonly known as jacket) maintenance shell.
(2) Glass fiber reinforced unsaturated polyester resin plastic (commonly known as FRP) maintenance shell.
(3) Maintenance shells with other data, such as spirally welded steel pipe, straight welded steel pipe, bellows, etc.
3. According to the location of heat preservation pipe processing
(1) Factory prefabricated insulating pipes: prefabricated insulating pipes stop processing and manufacturing in the factory.
(2) Prefabricated insulating pipes on site: This product is a simple direct buried heating pipeline which came into being in the 1990s in order to save the cost of heating pipeline construction. The steel pipe is transported to the construction site to stop foaming and heat preservation, and winding the FRP maintenance shell after heat preservation.
4. Divide the low-temperature prefabricated direct-buried insulating pipe according to the structure of insulating layer and heat medium steel pipe
(1) Open insulating pipe: a low melting point coating is applied between the insulating layer and the steel pipe, such as low-grade asphalt, heavy oil, etc. It melts after being heated, the pipeline can expand and contract freely in the insulation layer, and the insulation layer and backfill sand adhere to the movement pattern. This type of detachment is mainly used for low temperature composite insulation pipes, such as steam pipes.
(2) All-purpose heat preservation pipes: steel pipes, heat preservation materials and maintenance shells are bonded together to form a whole structure. When the temperature of the steel tube decreases due to the delivery medium, the insulation layer shrinks and moves along with it. The whole heat preservation pipe is mainly used in places where the temperature of heat medium is below 150 C. ,
In summary, all the above-mentioned Shandong Hipper Pipe Technology Development Co., Ltd. provides, want to know the knowledge of polyurethane insulation pipe manufacturers, welcome to pay attention to our website: https://www.sdhpgy.com Thank you for your support!
