Glass steel pipes

To illustrate, a glass steel buried pipeline foam construction

1, direct buried insulation pipe can be widely used in heating, geothermal, refrigeration, municipal construction, oil and other industrial sectors, adding flame retardant protective layer can also be used for overhead pipeline.

2, the depth of burying must ensure that load ten tons truck safety through, as far as possible, reduce heat loss, shall be laid in the ice below the line, different regions should be based on different conditions of the region specific treatment.

3, pipe trench excavation size should guarantee between the tubes, 200-250 mm interval left between the pipe and the trench wall, in order to on-site installation and joint treatment, gully bottom brick soil compaction, when necessary, available sand bedding.

4, direct buried pipe on the road, the laying depth, just not backfill soil covering is made into the trench forms in the pipe bedding, reinforced concrete plate groove or concrete casing treatment.

5, between the pipe and pipe, using welding (glass pipe connection technology and pressure test standards set separately) pipe after installation, pressure test (9 /cm L) 10 minutes buck 0.5 kg /cm - qualified, should maintain the ditch bottom water and installation of pipe welding joint, made after fully cured (48 hours) will be put into the ditch bottom pipeline, so as not to not make joint processing into the ditch, water soaking pipe joint part and reducing waterproof, anti-corrosion, insulation effect.

6, in the process of installation of the insulation pipe, can be installed on one side, the side to do joint processing, can also be installed all pressure test again after the joint processing.

(1) in order to ensure the joint waterproof, anti-corrosion, insulation effect, to ensure that joint site condition is very necessary.

(2) joint field temperature, in the operation should be kept above 10 degrees, the minimum should not lower than 5 DEG C, the winter is not suitable to do joint processing, rainy days, not suitable for joint treatment, gully bottom wet, water does not do joint processing.

Two, direct buried insulation pipe overview:

Direct buried insulation pipe is mainly composed of four parts.

1: according to the requirement of working steel pipe conveying medium technology respectively adopts a welding steel submerged arc spiral seam steel pipe, seamless steel pipe, double-sided.

The 2 insulation layer: use of rigid polyurethane foam.

3: protective shell is made of high density polyethylene or glass steel.

4 leakage alarm line: manufacturing of directly buried heat insulation pipe, in the insulation layer near the pipe, buried with the warning line, once the pipeline leakage alarm line somewhere, by conduction, can be in a dedicated instrumentation alarm and display the location and the degree of leakage Water Leakage big small, to inform the pipe repair personnel quickly processing Water Leakage, guarantee the safe operation of heat supply network.

Three, direct buried insulation pipe performance:

Direct buried insulation pipe has good mechanical performance and heat insulation performance, usually resistant to the high temperature of 120 DEG C through modification or other insulating material resistant to high temperature of 180 DEG C combination, insulation engineering applicable to all kinds of cold, hot water high temperature pipeline.

Four, the advantages of directly buried heat insulation pipe:

1, reduce project cost.

According to estimates by a relevant department, two pipe heating pipe, under normal circumstances can reduce the project cost 25% (made of glass steel as a protective layer) and 10% (using high density polyethylene as a protective layer around).

2 low heat loss, energy saving.

Direct buried insulation pipe of the thermal conductivity coefficient: lambda =0.013 - 0.03kcal/m - H - oC, other than in the past used pipe insulation material is much lower, the insulation effect is increased by 4~9 times. Again the water absorption rate is very low, about 0.2kg/m2. The reason of low water absorption is due to closed cell polyurethane foam rate around 92%. Low thermal conductivity and low water absorption rate, coupled with the thermal insulation layer and the outside good waterproof properties of high density polyethylene or glass steel shell, has changed the traditional trench laying heating pipeline "wear wet jacket" situation, greatly reducing the overall heat loss of heat supply pipeline, network heat loss is 2%, less than 10% of the requirements of international standard.

3, anti-corrosion, insulation performance is good, the service life is long.

Direct buried insulation pipe because of rigid polyurethane foam insulation layer bonded in the steel sheath, cut off the air and water infiltration, can play a good role in anti-corrosion. At the same time, foaming holes it is closed, water absorption is very small. High density polyethylene shell, glass steel shell has good anti-corrosion, insulation and mechanical properties. Therefore, the work pipe sheath hard to erosion of the outside air and water. As long as the internal pipeline water treatment, according to foreign information, directly buried insulating pipe service life can reach more than 50 years, the use of 3~4 times higher than the traditional life and trench laying overhead laying.

4 an area of small, fast construction, is beneficial to environmental protection and reduce the construction people.

Don't need laying large trench buried heating pipe, only the people buried underground heat insulation pipe, thereby greatly reducing the area, reducing the volume of earth excavation about 50% above, to reduce the amount of 90% civil masonry and concrete. At the same time, heat preservation tube processing and on-site trench parallel, simply field joints, can greatly shorten the construction period. Due to the reduction of the brick, cement, sand and gravel, the remnant soil of transportation, thereby reducing the exhaust emission in the process of construction quantity, dust emission, noise emissions, so as to protect the environment.

5, security

At present, in addition to direct buried insulation pipe production outside of China, are equipped with leakage alarm line, once the pipeline leakage alarm line somewhere, by conduction, can show the insulation pipe seepage, leakage and leakage extent accurate position in the special detecting instruments, the pipe section to inform the inspection personnel quickly processing infiltration leakage. To ensure the safe operation of heat supply network. Domestic production of thermal insulation pipe leakage current alarm line end design, need to fill this blank.

Five, direct buried insulation pipe summary:

The total