BS 778:1966

This standard BS 778:1966 Specification for steel pipes and joints for hydraulic purposes is classified in these ICS categories:

• 23.100.40 Piping and couplings

1.1.1 This part covers steel pipes and flange joints for hydraulic purposes employing working fluids such as water and oil in sizes from in to 5½ in outside diameter, suitable for the following design pressures:

1. up to and including 1 500 lbf/in²
2. above 1 500 lbf/in² up to and including 2 500 lbf/in²
3. above 2 500 lbf/in² up to and including 5 000 lbf/in².

The joint comprises freely fitting flanges screwed on to the pipe with a joint ring between the ends of the pipes themselves.