Technical Information

Malleable Iron Fittings


  • The design test pressure for sizes 1/8″ (6mm) up to 4″ (100mm) is 100 bar.
  • This is a hydrostatic test at ambient temperature. This applies to all fittings except for unions; unions must withstand a test pressure not less than 1.5 x permissible working pressure at ambient temperature shown in the table below.
  • Permissible working pressure and temperature ratings are given in the table below. Please note that for the steam applications we recommend the use of mild steel fittings to BS EM10241

*Pressure/temperature ratings on this page do not apply to galvanised compression fittings. Please see relevant page for details.