Blowpipe Lite by Silverglance Software enables rapid sizing of low-flowrate HVAC pipes (max 20 gpm / 1 kg/s).
Calculations also include pump motor sizes pipe expansion weight and heat transfer. The app may be upgraded to the full version with no restrictions by in-app billing.

Blowpipe Lite operates in either metric or imperial units using calculation methods common to UK Europe and USA and with international pipe data.