Pipe Diameter

The pipe diameter in units as specified in the Project Tab Page. A nominal size may be selected from a drop down list or entered manually, in which case the program determines the actual internal diameter on the basis of the piping material code entered (next item) except for hoses and hose reels where the entered diameter is the internal diameter. If the pipe is a non-standard size or of a material not included in the program or of different wall thickness, then the actual internal diameter may be entered prefixed by a negative sign: i.e. -45 is taken as a pipe of 45 mm internal diameter.

The nominal sizes allowed depend on the piping material. If a nominal size is entered and the relevant standard for the entered piping material does not include this size, then the green smiley face will turn red e.g. the entry of a 200 mm diameter pipe with a material type of ASAM (medium steel pipe to AS 1074) is an error as this standard does not include pipe sizes larger than 150 mm diameter.

The correct pipe diameters will appear in the drop down list if the appropriate pipe material in the next column is selected or the default pipe material includes the required diameters. This also applies to user entered pipe materials and their diameters. New user pipe materials can be entered via the User Data Button on the Main Screen.

The Internal Pipe diameters Versus Nominal Pipe Sizes are listed here for each pipe material under Internal Pipe Diameters (small pipes) - Mist Systems and Internal Pipe Diameters - High Density Polyethylene.

For Stainless Steel Tubing the pipe internal diameters must be entered by the user because the wall thickness for the different nominal pipe sizes is a function of the allowable pressure. Hence the stainless steel tubing pipe sizes that the user wishes to use must be entered in the “User Defined Pipes” screen where once entered and saved can be saved and stored for any other project. For example a user might enter a pipe material SS30 with internal diameters for a design pressure of 30MPa and another set of diameters SS25 for a design pressure of 25MPa.