Size

Pipe sizing chart

A pipe sizing chart can be used in conjuction with Appendix F Sizing consumer piping of AS 5601 to help you determine the size of each section of pipework. The chart can be drawn on the plan by hand or calculated via a spreadsheet program like Microsoft Excel. The following diagram outlines the features of the pipe sizing chart.

Graphic of a sample pipe sizing chart. The chart details the pipe section column, the gas flow column and the nominal size column.

The following demonstration steps through the process of correctly sizing the pipework for an LPG catering carvan installation.

Use the Worked example's Back and Next navigation to view the sizing consumer pipework worked example.


 
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Worked example

This worked example steps through the process of determining the size of consumer pipework.

Graphic of a main gas run and a sample pipe sizing chart. The chart details the pipe section column, the gas flow column and the nominal size column.

The main run

The main run is the length of consumer piping from the meter to the furthest appliance position. In this example the main run is 9 metres.

 

Graphic of a main gas run.

Referring to the pipe sizing table in AS 5601

We know that copper piping is going to be used for this LPG installation example so we will refer to pipe sizing table F27 in AS 5601.

Partial image of pipe sizing table from AS 5601.

Table F27 of AS 5601

Look at the main run length shown under the 'Length of straight pipe' columns in table F27. If the main run falls between two figures, use the greater. For our example 10 metres is used because the main run length is 9 metres.

Partial image of pipe sizing table from AS 5601.

Section A - B of the main run

Section A - B has a total flow rate of 170 MJ/hr. Follow the 10 m column down until the figure of 170 or larger is reached, in this case 291.

Partial image of pipe sizing table from AS 5601.

Nominal size

Read across the table to the corresponding 'Nominal size', in this case DN 20.

Partial image of pipe sizing table from AS 5601.


Insert pipe size into chart

Enter the pipe size into the Nominal size (DN) column of the pipe sizing chart.

 

Worked example pipe sizing chart showing a pipe size of DN 20 for pipe section A-B.

Determine the remaining pipe sizes

Determine the pipe sizes of the remaining sections. Continue to use the main run length (10 m in the example), not the individual length of each section. Enter the remaining pipe sizes into the pipe sizing chart.

Worked example pipe sizing chart showing a pipe size of DN 20 for pipe section A-B, DN 20 for pipe section B-C and DN 6 for pipe section B-D.


 

Cooper

The proprietor of a local catering company has contracted Cooper the plumber to design a gas installation for his brand new hot jam donut caravan.

Cooper has started designing the installation and has determined:

  • the LPG appliances have a total appliance gas load of 149 MJ/hr
  • copper tubing is a suitable material for the pipework
  • the design of the consumer pipework path for the caravan.

The next stage is to size the pipe materials and design the pipe support system for Mike Lee's hot jam donut caravan.

 

Cooper

Jean C Williams has contracted Cooper to design a commercial kitchen gas installation for the restaurant. Cooper has started designing the installation and has determined:

  • the natural gas appliances have a total appliance gas load of 463 MJ/hr
  • copper tubing is a suitable material for the pipework
  • the design of the consumer pipework path for the commercial kitchen.

The next stage is to size the pipe materials for Jean C Williams' commercial kitchen.