HUGGY The Good Pipe
 
This IPhone application gives reference information about existing gas pipes and allows the user to compute the gas pipe diameter to use depending on the gas pressure and the length of the pipe, or to compute the resulting pressure depending on the installed gas pipe size.
 
Note: This application is named after the character "Huggy Bear" in the TV serie Starsky and Hutch, which French name is "Huggy The Good Pipe" (a good pipe being a valid information in French slang).
 
1. Main Menu
When the application starts, the user is driven to the following screen:
 
Screen 1 - Main Menu

The user chooses the function by pressing on the corresponding button.
The button i shows information about this application.
 
2. Calibre List
The calibre list screen shows, for most popular gas pipes, three very important parameters to remember, i.e.:
  • the calibre
  • the external diameter
  • the internal diameter
In every computation, the application uses or provides the internal pipe diameter.
When a gas pipe is specified, its internal diameter is displayed.
It is the responsability of the gas professional to select the nature of the gas pipe depending on the official rules (ex. DTU 61.1 NFP 45-204 for France).
 
Screen 2 - Type of pipe selection

The user selects the type of pipe by pressing on the > symbol on the right side of the screen.

 
Screen 3 - Example for the PEHD

 
2. Nm3 - kWh - Conversion
Depending on the type of gas selected (natural or propane), and the geographical serviced area, the user will select natural gas of type H (high calorific power) or natural gas of type B (low calorific power).
The application uses natural gas of type H by default.
If the user wants to make a simulation for propane gas, it is very important to select the right parameter (gas density of 1.52).
 
Screen 4 - Gas type selection

The user selects the type of gas by pressing on the > symbol on the right side of the screen.

  Knowing powers expressed in kW and depending on the service pressure expected by the customer, the following table will give the corresponding Nm3 (Normal cubic meter) and show the meter type to be installed at the customer's premise.

For the gas pipe size computation, when the user is asked to enter Nm3, make sure to enter normal cubic meters and not regular cuboc meters (very important, otherwise the results will be wrong).

Numeric example:
  • For an expected power of 71 kW under 21 mb, this gives 6 Nm3, the meter to install is a G4 of 6 m3
  • For an expected power of 90 kW under 300 mb, this gives 8 Nm3, the meter to install is a G4 of 6 m3
kW = Nm3 x selected gas PCS
Nm3 = meter type m3 x (1.013 bar + Service pressure in bar)
 
Screen 5 - Example for natural gas of type H

 
3. Compute Diameter
To compute the diameter of a gas pipe to be installed, the user must first choose the formula depending on the expected service pressure.
If the service pressure is 21 mb or 37 mb, select the first formula.
If the service pressure is 300 mb or 1.5 bar or 4 bar, select the second formula.

Screen 6 - Gas pressure selection

The user selects the gas pressure by pressing on the > symbol on the right side of the screen.

  To compute the pipe diameter for a gas pressure less than 50 mb,

The user must:
1) Select the type of gas (Naturel gas H by default)
2) Enter the length of the pipe to install in meters
3) Enter the gas flow in cubic meters/hour
4) Enter the maximum accepted pressure loss (1 mbar by default)

The maximum accpeted pressure loss by default means that if the input pressure is of 21 mb, the output pressure at the end of the pipe will be 20 mb.
The user can increase this pressure loss, however care must be taken that the attached device can operate with the resulting pressure.

The computation result gives the internal diameter of the gas pipe. The gas professional will then choose the pipe type as per the current norms (ex. NFP 45-204 for France)
 
Screen 7 - Pressure less than 50 mb form


Screen 8 - Computation example


To compute the diameter of pipe for a pressure greater than 50 mb (300 mb, 1500 mb, 4000 mb or 8000 mb for instance)

The user must:
1) Select the type of gas (Naturel gas H by default)
2) Enter the length of the pipe to install in meters
3) Enter the gas flow in Normal cubic meter/hour
4) Enter the input pressure in mbar (300 mbar for instance)
5) Enter the output pressure in mbar (280 mbar for instance)

Care must be taken that the attached device can operate with the given output gas pressure.

The computation result gives the internal diameter of the gas pipe. The gas professional will then choose the pipe type as per the current norms (ex. NFP 45-204 for France)
 
Screen 9 - Pressure greater than 50 mb form


Screen 10 - Computation example

4. Compute Pressure
The following form computes the resulting pressure when using an imposed gas pipe knowing its internal diameter (moreover because we haven't any other pipe in stock).
The user chooses the right formula depending on the service pressure.
 
Screen 11 - Gas pressure selection

The user selects the gas pressure by pressing on the > symbol on the right side of the screen.

  To compute the output pressure for a pipe for which the internal diameter is known and for a service gas pressure less than 50 mbar.

The user must:
1) Select the type of gas (Naturel gas H by default)
2) Enter the length of the pipe to install in meters
3) Enter the gas flow in cubic meters/hour
4) Select the internal diameter of the chosen gas pipe
5) Select the gas service pressure in the pipe.

The computation gives the gas output pressure and the resulting pressure loss.
 
Screen 12 - Pressure less than 50 mb form


Screen 13 - Computation example


To compute the output pressure for a pipe for which the internal diameter is known and for a service gas pressure greater than 50 mbar.

The user must:
1) Select the type of gas (Naturel gas H by default)
2) Enter the length of the pipe to install in meters
3) Enter the gas flow in Normal cubic meters/hour
4) Select the internal diameter of the chosen gas pipe
5) Select the gas service pressure in the pipe.

The computation gives the gas output pressure, the resulting pressure loss and the input/output gas speed as well.
 
Screen 14 - Pressure greater than 50 mb form


Screen 15 - Computation example

5. Application information
The user can display the various information related to this application, send a question or a comment via email or display the current version of the application.
 
Screen 16 - Information screen

 
 

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