Is it OK to connect the outlets of traps with different pressures to the same return line?
It depends on the conditions. Condensate will flash into flash steam when it travels from high pressure to low pressure. This results in a two-phase flow of flash steam and condensate inside the condensate return line. Such conditions require that this flash steam be taken into account when sizing the condensate return line (selecting proper pipe diameter). Careful consideration must be given if high pressure condensate is to be added to a return line designed to receive only low pressure condensate.
