Bell & Gossett DN0177 B Domestic Pump Centrifugal Pumps Series C35 - Manual (Page 12)

Installation
Preinstallation
Pump location guidelines
Follow these guidelines for locating the unit:
• Position the unit for easy access to all parts.
• Allow adequate space for servicing.
• Check ambient conditions.
Piping checklist
WARNING:
• The heating of water and other fluids causes volumetric expansion. The associated forces
can cause the failure of system components and the release of high-temperature fluids.
In order to prevent this, install properly sized and located compression tanks and
pressure-relief valves. Failure to follow these instructions can result in serious personal
injury or death, or property damage.
• Avoid serious personal injury and property damage. Make sure that the flange bolts are
adequately torqued.
• Never force piping to make a connection with a pump.
Check Explanation/comment Checked
Check that a section of straight pipe, with a length that
is five times its diameter, is installed between the
suction side of the pump and the first elbow, or that a
suction diffuser is installed.
This reduces suction turbulence by
straightening the flow of liquid before it enters
the pump.
Check that the suction and discharge pipes are
supported independently by use of pipe hangers near
the pump .
This eliminates pipe strain on the pump .
Check that there is a strong, rigid support for the
suction and discharge lines.
As a rule, ordinary wire or band hangers are not
adequate to maintain proper alignment.
For pumps with flanges, check that the bolt holes in
the pump flanges match the bolt holes in the pipe
flanges.
—
Check that the suction or discharge lines are not
forced into position.
—
Check that fittings for absorbing expansion are
installed in the system when considerable
temperature changes are expected.
This helps to avoid strain on the pump.
Check that a triple duty valve is installed in the
discharge line.
This valve serves as a check valve that protects
the pump from water hammer, and serves as
an isolation valve for servicing and for
throttling.
Check that the pipeline has isolation valves around
the pump and has a drain valve in the suction pipe.
—
Use PTFE tape sealer or a high quality thread sealant
when you install the suction and discharge
connections to a threaded pump housing.
—
Installation
10 Domestic ® Pumps Centrifugal Pumps Series B35, C17, C35 Installation, Operation, and Maintenance Manual