4.5 Standard DSS pipe and instrumentation diagram for
1- and 2-pump systems
INLET
VALVE
PULSATION
DAMPENER
CALIBRATION
COLUMN
Y-STRAINER
DOSING
PUMP
PRESSURE
RELIEF
VALVE
OUTLET
VALVE
BACK
PRESSURE
VALVE
PRESSURE
GAUGE
W/GUARD
PI
RETURN
TO TANK
BLEED
VALVE
JUNCTION BOX
OR
CONTROL PANEL
(OPTIONAL)
14
13
12
11
9
10
8
7
5
3
2
1
TM077051
Simplex DSS
INLET
VALVE
PULSATION
DAMPENER
CALIBRATION
COLUMN
Y-STRAINER
DOSING
PUMP 1
PRESSURE
RELIEF
VALVE
OUTLET
VALVE
BACK
PRESSURE
VALVE
PRESSURE
GAUGE
W/GUARD
PI
RETURN
TO TANK
BLEED
VALVE
JUNCTION BOX
OR
CONTROL PANEL
(OPTIONAL)
DOSING
PUMP 2
14
13
12
11
9
10
8
7
5
3
2
1
6
TM077052
Duplex DSS
Pos. Description
1 Inlet valve
2 Y-strainer
3 Bleed valve
4 Calibration column
5 Dosing pump 1
6 Dosing pump 2
7 Pressure relief valve
8 Back pressure valve
9 Outlet valve
10 Pulsation dampener
11 Bleed valve
12 Pressure gauge w/guard
13 Junction box or control panel (optional)
14 Return to tank
5. Transport and storage
Transport the DSS system carefully and only at tempera-
tures above 41 °F (5 °C).
Risk of breakage.
The DSS system is tested for tightness in the factory.
Some residual water may still be present in the fittings and
pipes.
• Check the DSS system for transportation damage or missing
parts.
• Store the DSS system in a sheltered place at temperatures
between 41 and 113 °F (5 and 45 °C).
6. Installation of DSS
WARNING
Toxic material
Death or serious personal injury
‐ Make sure that the room where the DSS system is in-
stalled has sufficient ventilation.
‐ Protect the DSS system against unauthorized access.
• During installation refer to plant engineering drawings,
construction drawings, engineering documentation, system
general arrangement, P&ID and electrical drawings, if included
in the scope of delivery. All DSS system pipes are supported
within DSS. Make sure to adequately support all pipes outside
DSS, including inlet, outlet, drain or vent pipes, to the site floor,
wall or ceiling. Do not use the DSS pipes for support.
• Allow for clearance around the DSS system for regular
maintenance to be safely carried out. Provide sufficient lighting.
• Allow provisions to drain the system pipes for maintenance and
repair.
• Depending on the vapor pressure of the dosing medium, you
may need to mount the inlet line with a continuous upward slope
from the supply tank to reduce gas locking, especially in volatile
media.
Keep the minimum diameter of the inlet and outlet lines.
Too small diameters may cause damage to the DSS sys-
tem and the dosing pump.
Depending on the viscosity and density of the dosing me-
dium, the number of valves and fittings, and the length of
the pipes, you may have to increase the pipe diameter.
The diameter and length of the outlet and inlet pipe or
tube must be dimensioned in such a way that pressure
peaks do not exceed the pressure limit during the dosing
stroke and the minimum pressure does not fall below the
vapor pressure of the dosing medium during the suction
stroke.
9
English (US)
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