It features a universal clamping system that can accommodate any size of pipe
or coupling, eliminating the need for inserts.
The size of pipe
the strong-back is intended to be used on is stenciled on the back for easy identification during a casualty.
The correct size of pipe
used for main and branch lines is determined by the permissible air velocity and pressure drop caused by the frictional resistance of the pipe.
There was also 2p on a pack of five small cigars, 5p on a 25g pack of rolling tobacco and 3p on the same size of pipe
A toggle enables the program to select a size of pipe
that is closest to the size calculated by the program.