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Tubing Materials and Dimensions: Volume, Resistance and Maintenance Layout

Application guide

Tube bore and length affect hold-up volume, resistance and arrival time; material affects contact with the actual medium. Narrow tubing can reduce volume but increase resistance or particle-related risk. Balance these effects for the complete task.

Application guides

Analytical instruments

Analytical instruments Overview
Liquid chromatography systems: locate the fluidic task before selecting pumps and valves
Spectroscopy and elemental analysis
Water analysis units
Analytical Sample Preparation
Analytical system integration
Piston Pumps in Analytical Instruments
Automated dilution with piston pumpsPiston Pump Titration
Syringe pump
Syringe-pump samplingMultiple dispensing with syringe pumpsSyringe-pump standard preparation and over-range sample dilutionSequential injection and flow analysis
Air-displacement pipetting pump
Disposable-Tip Sample TransferTip-based dilution and dispensingTip-based sample preparation
Valveless metering pumps
Repeated Dispensing with Valveless PumpsValveless-pump titrationCarrier-liquid and flow-cell supplyTwo-stream proportioning
Diaphragm pump
Wash-liquid supply and primingWorking-liquid replenishmentAuxiliary liquid circulationGas-liquid waste aspiration
Valves for Analytical Fluidics
MRV3 multi-source selectionHigh-pressure sample-loop injectionDetector Flow Diversion and BypassSolenoid-valve shutoff
Sampling, Washing and Mixing Components
Sampling needlesProbe-wash stationReaction-cup and microplate washingReaction mixing
Fluidic monitoring
Bubble and Liquid-State DetectionPressure and Blockage Monitoring
Tubing, fittings, filters and check valves
Tubing materials and dimensionsLow-retention connectionsFiltration and backflow protection

ON THIS PAGE

Locate the source, drive and receiving position for this taskBalance low volume, resistance and particle risksCompare product options against task requirementsFix the layout and record replacement dimensionsRecheck operating points after changing bore sizeAfter an abnormality or maintenance, first identify which segment needs recoveryContinue with tasks on the same branchReferencesRelated guides

01Locate the source, drive and receiving position for this task

Liquid source→Tubing with specified bore and length→Bend and support layout→Downstream receiving point
Functional or operational sequence; confirm connections and branches for each state on the instrument

Define tubing ID/OD, length, interface geometry, pressure, materials and maintenance method. Follow the diagram to confirm liquid contact, pressure and destination before assigning drive and connection roles.

02Balance low volume, resistance and particle risks

Calculate geometric volume using actual bore and length. Match ID, OD, wall thickness and bend layout to pressure and installation requirements. Confirm materials against formulation, temperature, contact time and cleaning.

Compare configuration conditions by actual task
Condition to compareInformation requiredSelection affected
Geometric volumeActual bore, length and added fitting volumeEstimate retention and arrival time
Pressure and assemblyID, OD, wall thickness, bends and actual loadBalance resistance and installation requirements
Material requirementsFormulation, temperature, contact duration and washing timeCompare compatibility and target loss

03Compare product options against task requirements

The following candidate options match this page's responsibilities. Compare them against the operating conditions described, then check capacity, materials and interfaces on the product pages. Card images show representative configurations; suitability must still be confirmed at actual operating points and by application results.

Move from task conditions to product configuration
Product categoryCorresponding roleConfirm before selection
Tubing materials and dimensionsConnection paths and shared volumeBore, length, load and actual formulation jointly determine materials and dimensions
  • Tubing materials and dimensions

04Fix the layout and record replacement dimensions

Secure the installed shape, avoiding kinks and incomplete connections. Preserve dimensions and identification during replacement, then reprime and check flow, delivered volume and arrival time.

Action records should link commands, valve or interface states and actual received results. When raw material, container or sample identity changes, reconfirm shared paths and conditions permitting the next step. Completion of drive movement alone does not replace task acceptance.

05Recheck operating points after changing bore size

Measure pressure, delay, residue and target recovery in the actual installation. After changing bore size, do not treat the original calibration or displacement volume as validated.

Link operating-point tests to interpretable results
Validation scenarioMeasurement or observationInterpretation and action
Installed conditionMeasure pressure, delay and received volumeRevalidate after changing tube bore or length
Sample integrityEvaluate residue and target recoveryReducing volume with smaller tubing does not necessarily improve method results

Record test medium, configuration, installed path and operating sequence; present routine operating points and boundary results separately. Calculations support design discussions, component documentation checks models, and installed measurements confirm the actual task.

06After an abnormality or maintenance, first identify which segment needs recovery

Misconnections, gaps, tube deformation or leaks may alter volume and pressure. Isolate the affected segment and reconfirm assembly; matching threads do not establish interchangeability.

Retain current source, container identity, completed actions, valve or interface state and actual receiving information. Use the table to locate the stage that changed before deciding to retry, continue or restart. After recovery, recheck the relevant operating point before returning an uncertain action to the automatic cycle.

  • Bring the fluidic diagram and operating-point records to discuss configuration

07Continue with tasks on the same branch

  • Tubing, Fittings, Filters and Check Valves: Assess the Complete Flow Path
  • Low-Hold-Up Connections: Matching Threads, Tube Ends and Port Geometry
  • Filter and check-valve protection: analytes, resistance and maintenance limits

References

View references (2)
  1. [1]IDEX Health & Science: Fluidics FAQs — Dead Volume and Fittings
  2. [2]FOREACH: Fittings and Tubing Catalog

Related guides

  • Low-Hold-Up Connections: Matching Threads, Tube Ends and Port Geometry
  • Filter and check-valve protection: analytes, resistance and maintenance limits
  • Pressure and blockage monitoring: establish action baselines before fault thresholds

Related Products

Tubing materials and dimensions; representative configuration. Select capacity, materials and interfaces for the application.

Tubing materials and dimensions

Related Technical Articles

Why Does Actual Flow Change So Much When the Tubing Size Changes on the Same Miniature Diaphragm Pump?

Even when the pump is unchanged, installed flow can change because of tubing inner diameter, length, bends, and the minimum bore of fittings. When flow falls after a tubing change, the effective response is neither to blame the pump first nor to enlarge every tube indiscriminately. Measure inlet pressure, outlet pressure, and accumulated flow together to determine where the added restriction actually occurs.

2026-08-24View Details

What is flow resistance calculation for? Using the Foreach calculator in fluid-path design and selection

The free flow rate of the pump meets the requirements. After installing the pipelines, valves and joints, the liquid supply at the end is insufficient. Flow resistance calculations can break the problem down into comparable data: what pressure differential is required at the target flow rate, where does the pressure loss mainly occur, and what happens if the pipe diameter, pipe length, component Cv or medium viscosity is changed. This article combines the actual function of the Foreach flow resistance calculator with a recalculable fluid circuit case to explain how to use the calculation results for design, selection, troubleshooting and prototype verification.

2026-09-11View Details

Discuss tubing materials and dimensions for your fluid path

Provide a fluidic diagram, actual liquids and pressures in each operating state. Specify actual bore, length and fitting volume; ID, OD, wall thickness, bends and load; and formulation, temperature, contact and cleaning times. Compare configurations against this guide's validation objectives.

Contact an engineer