Structured Manufacturing Data (2026)

Pressure Vessels

Based on aggregated insights from structured factory profiles within the CNFX directory, the standard Pressure Vessels used in the Machinery and Equipment Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Pressure Vessels is characterized by the integration of Cylindrical Shell and End Cap / Head. In industrial production environments, manufacturers listed on CNFX commonly emphasize Fiberglass-Reinforced Plastic (FRP) construction to support stable, high-cycle operation across diverse manufacturing scenarios.

A sealed container designed to hold fluids at a pressure substantially different from the ambient pressure, serving as the core housing for reverse osmosis membrane elements.

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Product Specifications

Technical details and manufacturing context for Pressure Vessels

Definition
In a Reverse Osmosis (RO) unit, pressure vessels are cylindrical housings that contain and support the semi-permeable membrane elements. They are engineered to withstand the high operating pressures required to force feedwater through the membranes, separating purified water (permeate) from concentrated brine (reject). Their primary role is to provide a secure, pressurized environment for the filtration process while protecting the delicate membrane elements from physical damage and contamination.
Working Principle
The pressure vessel receives pressurized feedwater from the high-pressure pump. This water is forced longitudinally through the vessel, passing over the surface of the spiral-wound membrane elements housed inside. The applied pressure (typically 50-1000 psi, depending on application) overcomes the natural osmotic pressure, driving water molecules through the membrane while rejecting dissolved salts and contaminants. The purified permeate is collected centrally, while the concentrated reject stream exits the vessel's end.
Common Materials
Fiberglass-Reinforced Plastic (FRP), Stainless Steel (e.g., 316L), Duplex Stainless Steel
Technical Parameters
  • Standard diameters include 4-inch (approx. 101.6 mm), 8-inch (approx. 203.2 mm), and larger industrial sizes, with lengths typically ranging from 1 to 6 meters to accommodate multiple membrane elements in series. (mm) Per Request
Components / BOM
  • Cylindrical Shell
    The main body that contains the internal pressure and houses the membrane elements.
    Material: FRP or Stainless Steel
  • End Cap / Head Part
    Seals the ends of the vessel, often containing ports for feed inlet, concentrate outlet, and permeate collection tube.
    Material: FRP, Stainless Steel, or Engineering Plastic
  • Permeate Tube
    A central tube running the length of the vessel that collects purified water (permeate) from the membrane elements and channels it out of the vessel.
    Material: PVC, ABS, or Stainless Steel
  • Interconnector / Adapter Part
    Seals and connects adjacent membrane elements inside the vessel, ensuring proper flow from one element to the next.
    Material: ABS or Polypropylene
  • Anti-Telescoping Device (ATD)
    Prevents the stack of membrane elements from being pushed downstream under high pressure, which could damage the elements.
    Material: FRP or Plastic

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Pressure Vessels.

reverse osmosis pressure vessel housing FRP pressure vessel for water treatment stainless steel membrane pressure vessel industrial RO system pressure container high-pressure vessel with anti-telescoping device

Applied To / Applications

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

Reverse Osmosis Unit
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Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Up to 1200 psi (82.7 bar) for standard vessels, higher for specialized applications
flow rate: Vessel-dependent: typically 5-100 GPM per vessel (19-379 L/min)
other spec: pH range: 2-11 (cleaning), 4-10 (continuous operation)
temperature: 5°C to 45°C (typical RO operation range)
slurry concentration: Not applicable for RO membranes (solids-free feed required)
Media Compatibility
✓ Potable water treatment ✓ Brackish water desalination ✓ Industrial process water purification
Unsuitable: High-viscosity fluids or abrasive slurries (causes membrane fouling/damage)
Sizing Data Required
  • Required permeate flow rate (GPM or m³/day)
  • Feed water quality/TDS (mg/L)
  • System recovery rate (%)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Stress Corrosion Cracking (SCC)
Cause: Combination of tensile stress (residual or applied) and corrosive environment (e.g., chlorides, sulfides, caustics) leading to crack initiation and propagation, often at welds or high-stress areas.
Creep Rupture
Cause: Time-dependent deformation under sustained high temperature and pressure, leading to microstructural changes, void formation, and eventual rupture, typically in high-temperature applications above design limits.
Maintenance Indicators
  • Visible bulging, distortion, or localized swelling on the vessel shell or head indicating overpressure or material degradation.
  • Audible hissing, whistling, or popping sounds from relief valves, seams, or connections suggesting leaks, overpressure, or imminent failure.
Engineering Tips
  • Implement a robust corrosion monitoring program using techniques like ultrasonic thickness testing (UTT) and internal inspection to track wall thinning and schedule timely repairs.
  • Ensure proper pressure relief system maintenance by regularly testing and calibrating safety valves and rupture discs to prevent overpressure scenarios and comply with ASME Boiler and Pressure Vessel Code standards.

Compliance & Manufacturing Standards

Reference Standards
ISO 16528-1:2019 - Boilers and pressure vessels ASME Boiler and Pressure Vessel Code (BPVC) Section VIII EN 13445:2021 - Unfired pressure vessels
Manufacturing Precision
  • Wall thickness: +/-10% of nominal thickness
  • Circumferential weld misalignment: ≤ 1.5mm or 10% of thinner plate thickness
Quality Inspection
  • Hydrostatic pressure test
  • Radiographic testing (RT) of welds

Factories Producing Pressure Vessels

Manufacturer profiles with relevant production capability in China

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Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What materials are best for reverse osmosis pressure vessels in corrosive environments?

For highly corrosive environments, 316L stainless steel or duplex stainless steel offer superior corrosion resistance. Fiberglass-Reinforced Plastic (FRP) is also excellent for chemical resistance and is often more cost-effective for certain applications.

What is the function of the Anti-Telescoping Device (ATD) in a pressure vessel?

The Anti-Telescoping Device prevents membrane elements from shifting or 'telescoping' under high pressure differentials during operation, ensuring proper alignment and preventing damage to the membrane elements and internal components.

How do I select the right pressure vessel for my reverse osmosis system?

Selection depends on operating pressure requirements, fluid compatibility (choose materials accordingly), number of membrane elements needed, and industry standards. Consider factors like pressure rating, diameter, and connection types to match your specific RO system configuration.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

Data basis: CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks for Machinery and Equipment Manufacturing.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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