Permeate Tube for Pressure Vessels | Specifications & Selection

Product Specifications

Technical details and manufacturing context for Permeate Tube

Definition

A permeate tube is a critical internal component of pressure vessels used in filtration systems, particularly in reverse osmosis, nanofiltration, and ultrafiltration applications. It serves as the central collection manifold that gathers purified fluid (permeate) that has passed through the surrounding membrane elements. The tube typically runs axially through the center of the pressure vessel, featuring perforations or slots along its length to allow permeate entry from the membrane elements. It is engineered to withstand the internal pressure of the vessel while maintaining structural integrity to ensure efficient fluid collection and minimal pressure drop. The permeate tube is available in materials such as stainless steel (e.g., 316L), fiber-reinforced plastic (FRP), and PVC-U, with selection based on chemical compatibility and operating conditions. Key parameters include inner diameter (20–50 mm), outer diameter (25–60 mm), length (1000–6000 mm), wall thickness (2–5 mm), operating temperature (5–45 °C), pH range (2–12), tensile strength (45–60 MPa per ASTM D638), surface roughness (0.8–1.6 µm Ra per ISO 4287), weight (0.5–3.0 kg/m), and material grade (PVC, UPVC, CPVC, PP per ASTM D1784). These values are reference ranges and must be verified for the specific model and application. The permeate tube is designed to operate within these parameters to ensure reliable performance and longevity. It is essential to confirm the exact specifications with the legal manufacturer or supplier before procurement, as deviations may affect system efficiency and safety.

Working Principle

The permeate tube operates by providing a low-pressure pathway for filtered fluid. As feed water is pressurized within the vessel and forced through semi-permeable membranes, the purified water (permeate) passes through the membrane and enters the permeate tube through its openings. The collected permeate then flows axially through the tube to the vessel outlet, separated from the concentrated reject stream. The tube's design ensures laminar flow with minimal turbulence to maintain filtration efficiency.

Common Materials

Stainless Steel (e.g., 316L), Fiber-Reinforced Plastic (FRP), PVC-U

Technical Parameters

Parameter	Typical range	Notes & selection driver
Inner Diameter	20–50 mm	Matches membrane element outlet size
Outer Diameter	25–60 mm	Fits pressure vessel housing
Length	1000–6000 mm	Customizable to vessel size
Wall Thickness	2–5 mm	Affects pressure rating and weight
Operating Temperature	5–45 °C	Above 45°C may degrade membrane
pH Range	2–12	Outside range may cause corrosion
Tensile Strength	45–60 MPa	Ensures structural integrity under pressureASTM D638
Surface Roughness	0.8–1.6 µm Ra	Smooth surface reduces foulingISO 4287
Weight	0.5–3.0 kg/m	Per meter length
Material Grade	PVC, UPVC, CPVC, PP	Select based on chemical compatibilityASTM D1784

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Tube Body Part
Main structural cylinder providing the primary flow path for collected permeate.

Material: Stainless Steel or FRP
Perforations/Slots Part
Openings along the tube length that allow permeate to enter from surrounding membrane elements.

Material: Same as tube body
End Connectors Part
Fittings at each end for connecting to vessel ports and adjacent tube sections in multi-element systems.

Material: Stainless Steel or Plastic

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Pressure Vessels

View system integration details

Manufacturers of Permeate Tube

Manufacturer profiles associated with Permeate Tube.

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Frequently Asked Questions

What is the primary function of a permeate tube?

The permeate tube collects purified fluid (permeate) that passes through membrane elements in a pressure vessel and channels it to the outlet, separating it from the concentrated reject stream.

What materials are commonly used for permeate tubes?

Common materials include stainless steel (e.g., 316L), fiber-reinforced plastic (FRP), and PVC-U. The choice depends on chemical compatibility and operating conditions.

What are typical operating pressure and temperature ranges?

Typical and operating temperature is 5–45 °C. These are reference ranges; verify for your specific application.

How should I select the correct permeate tube for my system?

Consider the membrane element outlet size, pressure vessel housing dimensions, chemical compatibility, and operating conditions. Always confirm specifications with the manufacturer or supplier.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Up to 150 psi (10.3 bar)
flow rate:	0.5 to 10 GPM per tube
temperature:	-10°C to 80°C
slurry concentration:	Up to 5% solids by weight

Permeate Tube

Product Specifications

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards