Interconnecting Piping: Diameter DN16 to DN200 (ISO)

Q: What materials are best for corrosive gas applications in vacuum piping?

PTFE-lined stainless steel or pure PTFE/PFA piping provides excellent chemical resistance while maintaining vacuum integrity, with electropolished 316L stainless steel as an alternative for moderate corrosion environments.

Q: How does pipe diameter affect vacuum system performance?

Larger diameters increase conductance (gas flow capacity), reducing pumping time and pressure differentials, but require more space and higher cost. Optimal diameter balances conductance needs with system constraints.

Q: What maintenance is required for vacuum interconnecting pipes?

Regular leak testing using helium mass spectrometry, internal cleaning to remove contaminants, inspection of seals/flanges, and monitoring for vibration-induced stress at connection points.

Component Specifications

Definition

A network of pipes, fittings, and connectors designed to link various components of a vacuum pumping system, including pumps, chambers, valves, and gauges. These pipes maintain vacuum integrity while allowing efficient gas flow between system elements, with specialized designs to minimize conductance losses and prevent contamination.

Working Principle

Operates by creating sealed pathways for gas molecules to travel between vacuum system components under pressure differentials. The piping's internal geometry and surface finish minimize flow resistance (conductance), while joints maintain hermetic seals to prevent air ingress. Gas molecules move from high-pressure areas (like process chambers) toward low-pressure areas (pump inlets) through these interconnections.

Materials

Stainless steel (304L/316L), aluminum alloys, or specialized polymers (PTFE/PFA). Stainless steel offers corrosion resistance and ultra-high vacuum compatibility; aluminum provides lightweight options; polymers handle corrosive gases. All materials feature electropolished or smooth internal surfaces to reduce outgassing and particle adhesion.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Diameter	DN16 to DN200 (ISO)
Leak Rate	< 1×10^-9 mbar·L/s
Conductance	10-1000 L/s (depending on diameter/length)
Wall Thickness	Schedule 5S to 40S
Pressure Rating	10^-9 to 10^-3 mbar
Surface Roughness	Ra ≤ 0.8 μm

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

Standards

ISO 1609, DIN 28400, ASME B31.3

Parent Products

This component is used in the following industrial products

Vacuum Pumping System

A system that creates and maintains the required vacuum level within a Vacuum Induction Degassing Unit by removing gases and vapors from the chamber.

View Product Details

Inter-stage Transfer Pump/Piping

A system that transfers concentrated liquid between successive evaporation stages in a multi-stage vacuum evaporator train.

View Product Details

Engineering Analysis

Risks & Mitigation

Leak development at joints
Contamination buildup
Vibration-induced fatigue cracks
Thermal expansion stress
Corrosion from process gases

FMEA Triads

Trigger: Improper flange alignment during installation
Failure: Vacuum leak exceeding 1×10^-8 mbar·L/s
Mitigation: Use alignment tools during assembly, perform helium leak testing after installation, implement torque-controlled tightening procedures

Trigger: Particle accumulation in low-flow sections
Failure: Reduced conductance and contamination of process chamber
Mitigation: Install inline filters, implement regular purge cycles, design piping with minimal dead volumes and smooth directional changes

Trigger: Thermal cycling between process temperatures
Failure: Stress cracking at welded joints
Mitigation: Use expansion bellows in long runs, select materials with matching thermal coefficients, implement controlled heating/cooling cycles

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.1 mm on diameter, ±0.05° on angular alignment of flanges, surface roughness within ±10% of specified Ra value

Test Method

Helium mass spectrometer leak detection per ISO 1609, pressure decay testing, visual inspection with borescopes, conductance measurement using gas flow methods

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Interconnecting Piping

Manufacturer profiles associated with Interconnecting Piping.

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Frequently Asked Questions

What materials are best for corrosive gas applications in vacuum piping?