Calculation Sheet/Unit Conversion Sheet


Please use this alongside the technical manual. Values that can be obtained by entering the values are theoretical.

Specification Microsoft Excel
Operating Environment Windows XP or later, Microsoft Excel 2000 or later (recommended)

*The operation may become unstable depending on the user environment
 please note that this is outside the scope of Fukuda.

Usage Method
  1. Read the technical manual, and download the necessary calculation sheet(s).
  2. Enter the values in blue-font sections of each sheet.
  3. The calculation result will appear on the red-font section.
  • Either use our inquiry form or contact our nearest officeregarding questions and inquiries about the calculation sheet.
  • If you require either the Technical Manual or Leak Test I/II (textbook, Japanese text only) in booklet forms, please contact our nearest office.
Calculation Sheet

Gas/Liquid Leaks

When gas/liquid flows through a fixed pipeline, its flow will differ depending on the length of the pipe, its relationship with and the pressure of the gas/liquid. There several types of flow, including turbulent flow, viscous flow, molecular flow and sharp-edge orifices.

Contents Corresponding textbook page*1 Download
The Leak Test
1-1 Calculating level of Leak Rate (Turbulent flow) P.4-6 Under
1-2 Calculating level of Leak Rate
(Viscous flow, Cylindrical tube model)
P.6-9 Ⅱ P.25―26 Download
Calculations can be carried out with
different conditions such as media or pressure.
1-3 Calculating level of Leak Rate (Molecular flow) P.10 Ⅱ P.26 Under
2-1 Relationship between Leak Rate and Detected Differential Pressure (Differential Pressure Type Air Leak Testers) P.13-15 Download
2-2 Relationship between Leak Rate and Pressure Drop Rate (Direct Pressure Type Air Leak Testers) P.22 Download
2-3 Internal volume Calculation P.15 Ⅱ P.65-66
Measure and calculate internal volumes by differential pressure air leak testers and calibrators
3 Sensitivity calculation of the hydraulic submerge method (hole diameter where bubbles stop appearing) Ⅰ P.21-23 Download
4 Unit conversion (g / y and Pa · m3 / s) Ⅱ P.37-38 Download

*1: "T" refers to the Technical Manual; "I/II" refers to the Leak Test I/II (textbook).

Helium Collection Unit Selection Sheet

Use this when specifying the HES-2000 (helium leak test system) collection unit specifications.

Contents Download
Helium Recovery Unit Selection Sheet Download
Sheet 1
Selection of Recovery Tank
Sheet 2
Calculation of Measurement Time (calculation of measurement time/required processing volume)
Unit Conversion Sheet
Contents Download
Unit Conversion -Pressure Download
Unit Conversion -Flow rate (leak rate) Under

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