Goulds Pumps 3501 Mixer - IOM - Manual (Page 23)

Valves
·
Control valve is typically before the mixer.
·
If additional back pressure is required, the control
valve may be after the mixer.
·
Shut off valves should be after the mixer.
GAS MIXING
Pipe
·
Gas addition should always be added in the
chemical addition point of the chemical injection
pipe supplied with the mixer.
·
If flow velocity is higher than 9 ft/s, special 8°
increasers are required after the mixer.
·
Before any elbows, the flow velocity must be lower
than 2 ft/s.
·
Flow velocity into a tower must be 1.5 ft/s or lower.
·
Recommended angle at the bottom of the upflow
reactor is 36°.
Chemical Injection Pipe
·
Is two (2’) feet long and the same size and material
as the mixer.
·
Is part of the mixer design package.
Valves
·
Control valve cannot be after the mixer.
·
Shut off valve should be after the mixer.
·
The inner diameter of the shut off valve(s) must be
full port (same size as the inner diameter of the
pipe).
Pipe Supports - Liquid and Gas Mixing
·
Special care needs to be taken when designing pipe
supports around the mixer.
·
Often process temperatures are high, causing
thermal expansion and high loading.
·
Steam addition and steam mixing can cause thermal
expansion and high loading.
Mixer Flange Loads
·
Allowable flange loads for the suction and
discharge nozzles are available.
SPRING MOUNTED BASEPLATES
1. Raise or support the baseplate above the
foundation/floor. Be sure to allow enough room
under the baseplate to install the spring assemblies.
2. Set the bottom adjusting nuts on each spring stud to
the height indicated on the certified dimensional
drawing.
3. Insert a washer between the bottom adjusting nut and
the spring follower. Install a spring and another
follower. Install this subassembly from the bottom of
the baseplate.
4. Install the upper half of the spring assembly
consisting of a follower, a spring, another follower,
and a flat washer. Now install the top adjusting nut
and jam nut. Tighten finger tight.
5. Repeat steps one through four for all the spring
assemblies.
6. Once all the springs have been installed, lower the
unit on to the foundation pads.
3501 IOM 11/10 19
3
Fig. 18