Selection of steam pipeline traps for off-site use

It is recommended to choose S19H-16 (or S49H-16); DN15-20 will suffice

It is recommended to consult the valve supplier directly

Thermostatic valves are classified into mechanical type, thermodynamic type, thermostatic type, and pump-type thermostatic valves. To select the appropriate steam trap, the following factors need to be considered. 1. The appropriate type of drain valve should be selected based on its location of use: there are applications where rapid removal of condensate is necessary (such as heat exchange equipment, cylinder partitions, steam transmission pipelines, etc.), and applications where such rapid removal is not required (such as heating systems, heat tracing, etc.) ； In situations where rapid drainage of condensate is required, mechanical-type (inverted barrel type, float type) and thermodynamic-type (disk type, pulse type, labyrinth type, orifice plate type) steam traps should be selected ； Thermostatic types (bimetallic, diaphragm, bellows type) can be used in situations where rapid drainage of condensate is not required ； Pump-type steam traps should be used in special situations (i.e., when the inlet pressure of the steam trap is lower than the outlet pressure). 2. Select a steam trap that meets the equipment’s requirements regarding pressure (operating pressure, design pressure), temperature (operating temperature, design temperature), and material specifications. 3. Select an appropriate capacity for the steam trap based on the pressure difference across it and the amount of condensate discharged: The capacity of a steam trap is determined by multiplying the capacity of the steam-using equipment (i.e., the steam consumption) by a safety factor (generally, a safety factor of more than 2 is required for float-type steam traps, while a factor of more than 3 is necessary for other types of steam traps). The correct selection takes four parameters into account: operating pressure (pressure rating), pressure difference, water flow rate, and back pressure.

For the selection of steam traps, it is recommended that you refer to sections 2 \"Installation of Steam Traps\" and 4.0.1 \"Selection of Steam Traps\" in \"HG/T 20570.21-95 Installation of Steam Traps\", as well as the relevant calculations. For steam pipelines used for long-distance transmission, where intermittent drainage occurs, you can choose mechanical drain valves (float-type, bucket-type, etc.) ； Its size needs to be calculated by you based on its steam delivery capacity and the size of the main pipe. For your reference.