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SLOTTED PIPE is a kind of metal or plastic pipe with grooves of specific lengths, widths and distribution forms processed on the surface of the pipe wall. It is mainly used for fluid control, filtration and special connection requirements in the industrial field. The following is a detailed analysis from the dimensions of structure, process, and application:

I. Definition and Core Functions

Basic structure:

Longitudinal, spiral or ring-shaped grooves are cut on the surface of standard pipes (such as carbon steel, stainless steel or engineering plastic pipes) to form intermittent openings.

Core functions:

Fluid diversion and filtration: It allows fluids (liquids/gases) to enter or exit pipes through grooves while blocking solid particles (such as sand control filtration in oil extraction).

Structural connection: As a slotted connection component in mechanical assembly, it is used for bolt fixation or welding positioning (such as the sleeve of slotted anchor bolts).

II. Structural Design and Slot Type Classification

The geometric characteristics of grooves directly affect performance. Common groove types include:

Groove type	Geometric features	Application characteristics
Longitudinal straight groove	Parallel to the axis of the pipeline, it is distributed at equal intervals	Uniform fluid distribution (such as in irrigation systems)
Spiral groove	The spiral-shaped cut around the pipe wall	Enhance structural strength and resist deformation (oil well screen pipe)
Annular groove	A circular incision perpendicular to the axis	Limit fixation (bolt sleeve)

Key parameters:
Slot width: 0.1-5 mm (Filtration accuracy control)
Slotting ratio (opening area/total pipe wall area) : 10% - 30%, balancing flux and strength.

III. Manufacturing Processes and Technologies

Material selection:
Metal pipes: carbon steel (such as cold-drawn steel pipes), stainless steel (such as 304/316L corrosion-resistant types).
Plastic pipes: Flame-retardant engineering plastics (such as PVC in optical fiber channels).
Processing technology
Laser cutting: High-precision slotting with no burrs on the edges (suitable for precision filter tubes).
Mechanical milling: Low cost, used for large-sized grooves (such as building drainage pipes).
Welding assembly: Prefabricated slotted components are welded to the main pipeline (such as slotted flange interfaces).
Post-processing:
Metal pipes need to be galvanized (for anti-corrosion) or polished (to reduce fluid resistance). Plastic pipes need to be flame-retardant treated.

IV. Main Application Fields

Petroleum and Natural Gas

Sand prevention screen pipe: The spiral groove design prevents sand particles from entering the oil pipe, ensuring the extraction efficiency.

Underground diversion pipe: Multi-section grooves are made to achieve fluid isolation between layers.
Water treatment and Irrigation

Filter pipe: Longitudinal narrow groove for filtering impurities, used in drip irrigation systems or sewage treatment plants.
Architecture and Machinery

Drainage pipe: Annular groove accelerates rainwater infiltration (foundation drainage).

Assembly parts: Slotted bolt sleeves (such as "split anchor bolts") achieve concrete anchoring.

Special industrial scenarios:

Optical fiber channel: Plastic slotted tubes protect the optical fibers from bending damage (bending radius ≥40mm).

V. Technical Standards and Key Points for Selection

Material standard:

Metal tubes: ASTM A53 (carbon steel), ASTM A312 (stainless steel); Plastic pipe: UL94 V-0 flame retardant grade.

Performance verification

Pressure resistance test: Ensure the pressure-bearing capacity of the pipe after slotting (such as API 5CT standard).

Flow simulation: Calculate the pressure drop and flux under different slotting rates.

Key points for selection:

Corrosive environment → Stainless steel or galvanized pipes are preferred;

High filtration requirements → Narrow slot width + high slot opening rate design.

VI. Differences from Related Structures

VS Perforated Pipe:

Grooved pipe: The groove opening is linear, and the structural strength is higher.

Perforated pipe: Round holes are prone to clogging and are suitable for large particle scenarios.

VS Fiber Tray:

Slotted pipe: Its main function is fluid control.

Optical fiber channel: Special plastic channel, the core of which is to protect the cable rather than to guide the flow.

Summary

SLOTTED PIPE plays an irreplaceable role in the fields of fluid control, filtration and mechanical connection through precise slot design. Its performance depends on the coordinated optimization of materials, tank types and processes. The selection should be comprehensively considered in combination with the working pressure, corrosive environment and functional requirements. In industrial scenarios such as oil extraction and water treatment, its advantages of high reliability and customization are particularly prominent.

SLOTTED PIPE

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