Back-to-Lab Checklist: Inspecting Chemical Tubing Before the Fall Research Season

Back-to-Lab Checklist: Inspecting Chemical Tubing Before the Fall Research Season

Tubing is inexpensive compared with the equipment around it, but a cracked, clouded, hardened, or chemically attacked line can cause leaks, unstable flow, contamination, or lost experiments. A short inspection before the fall workload increases can prevent a rushed replacement later.

1. Confirm What Each Line Actually Carries

Do not rely only on the tubing’s color or location. Verify:

  • The chemical being transferred
  • Its concentration
  • The operating temperature
  • The pressure or vacuum conditions
  • Whether the line operates continuously or intermittently

Update any labels that are faded, incomplete, or no longer match the current setup.

Chemical compatibility should be reviewed against the full service conditions. Temperature, concentration, exposure time, fittings, and mechanical stress can all affect how a material performs.

2. Inspect More Than the Middle of the Tube

The most revealing areas are often near fittings, clamps, pumps, heated zones, sharp bends, and cabinet pass-throughs.

Look for:

  • Cracks, crazing, cuts, flat spots, or abrasion
  • Discoloration, swelling, stiffness, or tackiness
  • An unexpected loss of clarity
  • Kinks or tight bends that restrict flow
  • Loose connections or distorted tube ends
  • Tubing that has pulled against a fitting
  • Residue, crystals, or buildup that may indicate leakage, evaporation, or incompatible service

Never open or disturb a chemical line without following the laboratory’s shutdown, depressurization, decontamination, personal protective equipment, and waste-handling procedures.

3. Check Stored Tubing Before Installation

Replacement tubing can be compromised before it enters service.

Confirm that tubing coils are correctly identified, capped or protected where required, and stored away from dirt, sharp objects, excessive heat, and incompatible chemicals.

If several materials or sizes look similar, keep the identifying label with the actual coil rather than only on the outer shipping carton.

For critical work, record:

  • Tubing material
  • Nominal ID and OD
  • Supplier part number
  • Lot or batch information
  • Installation date

Traceability is much easier to establish before a coil is cut into short pieces.

4. Revisit Material Selection When the Process Changes

A line that worked last semester may no longer be appropriate if the laboratory changed the solvent, concentration, cleaning method, temperature, cycle time, or tubing route.

Fluoropolymer tubing can be a useful option for aggressive chemicals and demanding temperatures, but each material offers a different combination of properties.

PTFE Tubing

PTFE provides broad chemical resistance and high-temperature capability. It is generally opaque and may feel relatively firm, depending on its size and wall thickness.

FEP Tubing

FEP combines strong chemical resistance with transparency, making visual flow checks easier in suitable temperature ranges.

PFA Tubing

PFA offers high-purity potential, strong chemical resistance, and melt processability for demanding or continuous service.

PVDF Tubing

PVDF provides good mechanical strength and chemical resistance for selected fluids. Compatibility should be checked for the specific chemical, concentration, and operating temperature.

Material selection should never be based on the polymer name alone. The entire operating environment matters.

5. Document the Restart

OSHA’s Laboratory standard requires covered employers to maintain a Chemical Hygiene Plan addressing procedures, control measures, protective equipment, training, and responsibilities for work involving hazardous chemicals.

A seasonal tubing inspection can support that larger safety system, but it is not a substitute for the laboratory’s written procedures or a qualified safety review.

Record what was inspected, what was replaced, and any condition that requires follow-up.

If the same line repeatedly shows wear, treat that as a design signal. The routing, support, fitting selection, pulsation, temperature, or tubing material itself may need to change.

A good restart inspection asks two questions:

  1. Is the tubing still in acceptable condition?
  2. Is it still the right tubing for the current process?

Build a Small Spare-Tubing Kit Before the Semester Gets Busy

Keeping a clearly labeled spare coil and the correct fittings for commonly used sizes can reduce downtime.

Avoid creating an unlabeled assortment of tubing offcuts. A piece of tubing is not useful if no one can confidently identify its material and dimensions.

The spare-tubing inventory should periodically be reviewed for:

  • Correct material identification
  • Available lengths
  • Commonly used dimensions
  • Matching fittings
  • Storage condition
  • Lot or batch information when required

Fluorostore offers PTFE, FEP, PFA, PVDF, and fluoropolymer heat-shrink tubing in a range of standard sizes.

If your fall restart uncovers a line that needs replacement, contact our team with the chemical, concentration, temperature, pressure, dimensions, and flexibility requirements.

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