Model No: EP series

Expansion tube

Expansion tube is a device that compensates for thermal expansion and contraction, repairs or fixes pipelines through material deformation or structural design. It is mainly divided into the following types.

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1.Product classification of expansion anchor tubes

Ordinary expansion anchor tubes:

expansion anchor tubes used for compensating for thermal expansion and contraction of building water supply and drainage pipelines. It is usually installed at the location where plastic drainage pipes (such as PVC pipes) pass through floors or walls, and the holes are sealed by internal flame-retardant materials to prevent the spread of fire;

Petroleum expansion anchor tubes:

expansion anchor tubes uses hydraulic/mechanical drive to increase the diameter of the cone, and is used for oil well repair, sand control screen pipe, and hanging of open hole tail pipe. Expansion anchor tubes is divided into two types: solid expansion anchor tubes and slotted expansion anchor tubes;

Disposable expansion anchor tubes: specially designed for mining and tunnel blasting scenarios, disposable expansion anchor tubes rapidly expands to form a stable chamber after blasting, and disposable expansion anchor tubes has both support and safety protection functions.

2、 Expansion Anchor Tube Material and Structure

Heavy duty wall anchors material:

Heavy duty wall anchors in expansion anchor tubes for construction: plastic (nylon, PP) or metal (galvanized steel), suitable for different load-bearing and environmental requirements;

Heavy duty wall anchors in industrial expansion anchor tubes: Stainless steel (such as 316L) or double zone steel ERW steel pipes are commonly used in the petroleum industry, this heavy duty wall anchors have high strength and heavy duty wall anchors have corrosion resistance characteristics.

Structural characteristics of heavy duty wall anchors:

The fire-resistant ring of the building is embedded with flame-retardant expansion material, which seals the pipe through the wall hole after thermal expansion;

Oil expansion pipes achieve sand control and suspension functions through special processes such as slotting.

3、 Core functions of expansion anchor tubes

Thermal compensation: Relieve the stress caused by temperature changes in pipelines and prevent rupture;

Fireproof and flame retardant: The flame retardant ring expands and seals the holes to prevent the spread of fire (expansion bolts are required for pipe diameters ≥ 110mm);

Oil well repair: Subsidize damaged wellbore walls, extend well depths, and reduce drilling costs;

Blasting support: A disposable expansion anchor tubes provides fast and stable support in mining tunnels, reducing construction periods.

4、 Application scenarios of expansion anchor tubes

Typical Application Adaptation Product Types in the Field

Fireproof fixation of plastic drainage riser in construction engineering (mandatory installation for pipe diameter ≥ 110mm) with firestop ring and plastic expansion bolts

Subsidies for oil extraction wells, sand control screen pipes, tail pipe suspension solid/slotted expansion pipes

Disposable expansion tube for chamber support after blasting in underground tunnels of mines

Daily installation of wall appliances/bracket fixing (compatible with M6-M12 screws) plastic expansion anchor tubes

5、 Key points for installation and use of expansion anchor tubes,plastic expansion bolts

Installation of building fire-resistant ring:plastic expansion bolts

When the pipe diameter is greater than 110mm, the firestop ring must be fixed under the floor slab with plastic expansion bolts;

Pipe diameter ≤ 110mm can be directly installed with snap fasteners，no need to reinforce with additional plastic expansion bolts.

Material selection for heavy duty wall anchors:

Heavy duty wall anchors in the environment:Nylon expansion tubes (resistant to hydrolysis) are preferred for humid environments, and metal materials are suitable for high temperature scenarios;

Heavy duty wall anchors in the petroleum industry:the petroleum industry requires verification of pipe elongation (≥ 30%) and compressive strength (≥ 800MPa).

Adaptability to heavy duty wall anchors environment:

Temperature for heavy duty wall anchors:the working temperature range of building expansion pipes is -20 ℃~+80 ℃;

Heavy duty wall anchors in the mine:Disposable expansion pipes in mines need to withstand high pressure (≥ 50MPa) and complex geological conditions.

6、 Quality Control Standards for Heavy Duty Wall Anchors and plastic expansion bolts

Certification requirements for heavy duty wall anchors

Heavy duty wall anchors in the construction industry:the construction industry must comply with the GB50015-2019 fire protection regulations.

Heavy duty wall anchors in the industrial industry:the industrial industry must pass API certification;

Heavy Duty Wall Anchors's appearance inspection: The plastic expansion tube should be free of burrs and cracks, and the surface coating of the metal parts should be uniform without peeling off;

Heavy Duty Wall Anchors's load bearing test: For example, M10 expansion pipes need to withstand a static tensile force of ≥ 50kg.

About plastic expansion bolts

Plastic expansion bolts's summary: Plastic expansion bolts have been developed through material innovation,plastic expansion bolts include,such as nylon 66 and dual zone steel

Structural design:plastic expansion bolts

The structural design requirements for plastic expansion bolts include building fire protection.

The structural design requirements for plastic expansion bolts include petroleum repair.

Installation specifications:plastic expansion bolts

The installation specifications for plastic expansion bolts (such as pipe diameter and bolt compatibility) directly affect engineering safety

Quality control:plastic expansion bolts

The quality control for plastic expansion bolts (load-bearing, weather resistance) directly affect engineering safety