2205B0JE-DA-J-N_2014.05.
Screw Compressor J-series
Appendix 1.1 Precautions for Design of the Compressor Package
Appendix1-5
Liquid Injection Piping
To install liquid injection piping, follow the instructions below.
1) To connect the pipe for the liquid injection port, use ANSI #300 flanges. The flange size is
3/4B for 170J/220J and 1B for 280J.
2) While installing the pipes, take sufficient care not to allow any contamination such as spatters
to remain in the piping and enter the compressor.
Suction
Piping
For 170J/220J-series, before connecting the suction pipes, apply grease or liquid gasket (such as
HERME SEAL) to the counter bores, bolt heads, holes of the hexagon socket head cap screws
(493) fastening the suction adapter (492) to prevent rust and freeze up.
Make sure that the suction check valve located below the compressor suction flange is not
subjected to excessive force or damaged during installation of the suction pipe.
If no rustproof and freezing-proof coating is applied to the hexagon socket head
cap screws fastening the suction adapter, the suction flange and bolts may be
damaged.
Miscellaneous
1) Suction/discharge check valve
The 170J-220J-series integrates a suction check valve.
For the discharge side, a separate discharge check valve must be installed at the outlet of the
oil separator.
When two or more compressors are installed with a single oil separator, check
valves must be installed in each discharge pipes between the compressors and
the oil separator.
2) Suction strainer
To prevent foreign substances from entering the compressor, a suction gas strainer must be
installed in the suction line of the compressor.
Equal to or more than 100 meshes (equal to or more than 200 meshes when using a dry
process evaporator ) are recommended for the suction gas strainer.
