Leak testing

To products for leak testing:

Bubble test
Acoustic leak test methods
Pressure test

Leak testing or leak detection is a non-destructive testing method for the detection and localisation of leaks in pressure and vacuum systems.

"Leakage" means liquid or gas passing through a leak regardless of its physical size. A leak can be, for example, a crack, a breach, a notch or a hole, the gas (e.g. air) or liquid (e.g. water).

Leakages can significantly endanger the operational safety of vacuum or pressure systems (e.g. pressure vessels). Dangerous gases or liquids may escape. The leak test is also carried out for pyrotechnic devices, electronic parts, air conditioning systems, food packaging, etc..

Detection of vessel decompression with fluorescent concentrate H 849

The following table illustrates the relationship between the leak rate, the size of the leak and the resulting Leakage:

Leckagerate
[m³ Pa/s]		 Durchmesser
des Lecks		 Leckage durch das Leck
bei Δp = 1 bar
10¹ 1,0 mm Water is leaking out
10-1 0,1 mm Water is dripping
10-3 0,03 mm Waterproof but gas permeable
10-5 ≈ 3 µm 1 air bubble ( ≈1 mm³) in 10 seconds
10-7 ≈ 0,1 µm approx. 1 cm³ gas loss in 12 days
10-9 -- approx. 3 cm³ gas loss in 1 year
10-11 -- approx. 1 cm³ gas loss in 300 years

Bubble test

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Proof Check

Leak testing foam indicator

Wetting agent for leak testing of

  • Containers
  • Pipelines
  • Valves, taps
  • technical installations with gases
    (also flammable)
  • Liquid gas systems
Clear
616.000.001
Proof Check PLUS

Leak testing foam indicator

Wetting agent with high detection sensitivity for leak testing (leak detection) of e.g.

  • Containers such as gas cylinders
  • Pipelines
  • Soldered, flanged and welded connections
  • Fittings
  • Valves and armatures
Clear
616.000.010
Vacuum leak detector

The vacuum leak detector
EV 20 is suitable for leak detection of

  • Tubes
  • Containers
  • Sheet metal structures
Clear
611.010.001
Vacuum goggles for circumferential seams

OPTIONAL

  • with vacuum manometer
Clear
611.001.002
Vacuum frame for corner welds

OPTIONAL

  • With vacuum manometer
Clear
611.001.033
Vacuum frame for fillet welds

OPTIONAL

  • With vacuum manometer
Clear
611.001.030
Vacuum frame for butt welds

OPTIONAL

  • With vacuum manometer
Clear
611.001.031

Acoustic leak test methods

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SONAPHONE Pocket

Simple and compact ultrasonic flaw detector SONAPHONE Pocket for maintenance, and for quick and easy inspection of small leaks.

  • Compact mobile handheld device
  • Easy handling
  • Cost-effective
  • Extensive accessories for a wide range of applications
Clear
613.100.015

Pressure test

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Fluo H800

Helling Fluo H800 Öl

Oil-based concentrat


  • Oil-suspendable
  • Fluorescent
Clear
616.000.033
Fluo H 849

Helling Fluo 849 Konzentrat

Water-based concentrate


  • Water suspendable
  • Fluorescent
  • With emulsifier additive and corrosion protection
Clear
616.100.102
NORD-TEST FP 93 TU

Under UV irradiation yellow-green fluorescent penetrant for leak testing


Do not remove with water!
Clear
122.500.102
NORD-TEST FP 93 A(M) TU

Under UV irradiation yellow-green fluorescent penetrant for leak testing


Do not remove with water!
Clear
122.500.112