A brief description of the production process of polyurethane prefabricated direct buried insulation pipe

Polyurethane direct buried insulation pipe can be widely used in industrial and mining enterprises, petrochemical enterprises, urban central heating, pipe networks, residential communities and other fields throughout
the country.
Polyurethane direct buried insulation pipe produces high-density polyethylene outer protective pipe, and then pouring polyurethane rigid foam insulation layer in the gap between the polyethylene outer protective pipe and the steel pipe is what we often call the "two-step method"
.
Polyurethane direct buried insulation pipe production process: steel pipe rust removal - polyurethane foaming - forming - finished product detection - warehousing 1.
Rust removal 2.
Pipe piercing and bracket bundling: A.
The high-density polyethylene outer protection pipe selected according to the core pipe and insulation layer →
.
B.
After rust removal→ the steel pipe is bundled in sections (1.
5 m/section)→ the bundled bracket core tube is threaded into the high-density polyethylene outer protection tube, and the exposed parts of both ends of the core tube are 150mm-250mm
.
C.
Seal the chucks (inner or outer card) that conform to the core diameter and insulation thickness at both ends of the pipe and lock them tightly
.
Note: The structure, material, bundling method and compressive strength of the bracket should be selected
according to the core diameter and design requirements.
3.
Polyurethane casting foaming: adjust the mixing ratio of the foaming machine to 1:1.
05→ measure the flow rate of the equipment→ set the pouring time (feeding amount / flow).

Open the pouring hole in the middle of the HDPE outer protective pipe after the pipe is plugged at both ends of the pipe→ insert the pouring nozzle of the mixing head of the foaming machine into the pouring hole→ the pouring → material plug plugs the pouring hole→ ripening→ disassemble the chuck head→ inspect → correct the feeding amount → finished product
.