Bell & Gossett V1001576 Suction Diffuser Plus - Manual (Page 11)

Installation
Installation guidelines
WARNING:
All procedures must be performed by qualified personnel.
• Before selecting a location for the pump Suction Diffuser Plus, make sure that there is
enough room to remove the Suction Diffuser Plus orifice cylinder. The length
requirements are Shown as Dimension "A" in the following table.
• If the pump pad is resilient mounted (rubber or spring), make sure that the pad is
large enough to include an adjustable Suction Diffuser Plus support leg.
• A support leg, not furnished, is required between the Suction Diffuser Plus and the
support foot, not furnished, to support the Suction Diffuser Plus and prevent strain on
the pump. Bosses are provided on the Suction Diffuser to locate the support leg and
facilitate mounting the Suction Diffuser Plus in any of three positions. The length of the
support leg varies depending on the pump centerline to mounting surface dimension.
The support leg can be made of Schedule 40 pipe. Refer to column "D" in the
following table for the required diameter of the support leg. Final height adjustment is
made with the adjustable support foot.
• When installing flanged model Suction Diffuser Plus , a criss-cross pattern should be
used when tightening the bolts. If PTFE tape is used when installing cast iron NPT
Models, be careful not to overtighten the connections. Cracks may develop in the
casting.
• Suction Diffuser Plus blowdown is best accomplished with the system connection in
the 12 o'clock position. Blowdown is less effective with the system connection in the 3
and 9 o'clock positions.
• When insulating the Suction Diffuser Plus after system installation, provisions should
be made to permit removal of the start-up strainer, orifice cylinder, and inlet vane
assembly.
• It is recommended that a pressure-vacuum gauge be installed in the integral 1/4" NPT
tapping to monitor pump inlet pressure.
Installation
Suction Diffuser Plus INSTRUCTION MANUAL 9