Teikoku USA | Chempump
Instruction Manual HE-10677-P (1018)
18
Teikoku Type-R (Plan 13-SE) Refrigeration Pump
These instructions describe the recommended method for installation of the reverse circulation piping on
Teikoku Type-R (Plan 13-SE) pumps, which are specifically designed to handle highly volatile fluids. These
instructions also include recommendations for the suction pipe and the bypass pipe.
1. Reverse Circulation Piping
The purpose of these recommendations
is to vent any vapors that form inside the
reverse circulation pipe. Trapped vapors
in the reverse circulation line will cause
the flow through the line to stop. In the
event that the flow stops, the pump
will be damaged from liquid vaporiza-
tion and/or overheating. Following these
recommendations will allow both the
vapor and liquid to flow freely back to the
suction tank.
a. This line must be connected to the
vapor zone in the suction tank.
b. Never install a check valve on this line.
c. This line must be continuously rising
to the suction tank.
d. This line must never be down-slope
at any point, as this will create
vapor traps.
e. The Teikoku supplied reverse circula-
tion line orifice must be installed in
this line. Controlling the required re-
verse circulation flow rate using a flow
meter and a control valve is an option.
f. Install a block valve in this line. This
block valve must be 100% open at
all times.
g. To prevent vapor traps, use of a full
port ball type valve is recommended.
h. The orifice plate must be installed in
vertical line.
i. This line must be individual for each
pump. Never combine these lines.
j. Never connect this line to the suction,
discharge or minimum flow lines.
k. The total head of this line (HR) must
never exceed the value specified on
the data sheet of the pump.
2. Suction Pipe
a. Suction pipe shall be constantly falling
until it reaches the pump suction.
b. If any reducer is installed in the
suction line, the reducer must be ec-
centric and must be installed with the
flat side on top.
3. Bypass Pipe for Venting and
Minimum Flow
a. This line must be continuously rising
back up to the suction tank.
b. If incorporated, the orifice plate shall
be installed in vertical line.
c. Never combine these lines.
d. A block valve shall be installed in the
bypass line.
B. Reverse Circulation (4N-7653)
Figure B-1. Reverse Circulation Piping
LOWEST LIQUID LEVEL
HIGHEST LIQUID LEVEL
REVERSE PIPE
BYPASS PIPE
SUCTION
DISCHARGE
Q
S
Q
D
Q
R
Q
M
HRS
Q
S
Q
D
Q
M
Q
R
