Production process of polyurethane foam insulation pipe? Dacheng Xiangdong Insulation Refractory Material Factory 13473696600 15731614448
Production process of polyurethane foam insulation pipe? Dacheng Xiangdong Insulation Refractory Material Factory 13473696600 15731614448
Due to its long-lasting corrosion-resistant and anti-aging characteristics, polyurethane foam insulation pipes are popular in the application. Therefore, there is a great demand in the market, and therefore there is a large production requirement for the production of polyurethane insulation pipes. For the production and processing of polyurethane insulation pipes, it is necessary to deal with specific applications and structures. For the insulation layer with inner tube and outer sleeve, the polyurethane foam insulation tube usually directly injects the foaming slurry between the two tubes, and foams at one time.
Before the casting slurry is applied, the inner tube and the outer sleeve are to be properly concentrically treated with appropriate means, and the lower sealing treatment is tight, and the polyurethane foam insulation tube prevents the slurry from leaking. According to the flow state of the slurry and the foaming speed, the insulation layer with a smaller length can be poured upright, but for most of the insulation layers with a large length, the steel sleeve steel steam insulation tube is poured in a inclined manner for the slurry to flow. And foaming. Depending on the formulation and construction requirements, it can be injected from the upper side or from the lower part. Tianjin prefabricated direct buried insulation When the pipe is long, the slurry output from the mixing head can be introduced into the lower part of the pipe gap through the pipe, and the pipe is gradually withdrawn as the fluence increases. This method is only applicable to the production of ordinary casing insulation layer below 3mm.
For the construction of large-diameter, large-length casing-type pipelines, due to factors such as material formulation and production site conditions, manufacturers of direct-buried insulation pipes are usually prepared by horizontal direct infusion. The specific application of the specific method, the processing of the polyurethane insulation pipe can only have a sufficiently high use effect under the targeted processing, so as to ensure that the reference can reach a satisfactory level.
Precautions for the construction of polyurethane insulated direct buried pipeline (1) The groove should be leveled during construction to ensure the bottom of the tank is dry, and a fine sand cushion of about 200 mm thickness is required. The sides and upper part of the insulation pipe should cover at least 200 mm thick fine sand. . The purpose is to prevent the hard object from damaging the outer casing, and the second is to use the fluidity of the sand to fully fill the gap around the pipe to ensure sufficient friction.
(2) After the installation of the pipeline, the hydraulic pressure test of 1.5 times working pressure is required. After the water pressure test is passed, the interface foaming treatment can be carried out to ensure the moisture and oil stain on the surface of the joint steel pipe, the heat insulating end faces on both sides and the surface of the overlapping section outer casing. , impurities and end face protection layer are removed cleanly; the interface should use polyurethane foaming when the ambient temperature should not be lower than 10 ° C
(3) One-time compensation Direct buried pipeline must be preheated according to the design requirements. When preheating to the design temperature, the temperature should be kept constant, and the temperature can be guaranteed until the one-time compensator is finished or the backfill is completed.
(4) When the pipeline enters the building and the trench, the wall bushing shall be added, and the fixed pier shall be provided at the unearthing end.
(5) The backfill should be layered and compacted. The quality of the backfill is very important for the safe operation of the pipeline and must be taken seriously.
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