Goulds Pumps 3180-86 - IOM - Manual (Page 43)

Check Explanation/comment Checked
See Example: Discharge piping equipment for
illustrations.
Check that a check valve is installed in
the discharge line, between the
isolation valve and the pump discharge
outlet.
The location between the isolation valve and the
pump allows inspection of the check valve.
The check valve prevents damage to the pump and
seal due to the back flow through the pump, when
the drive unit is shut off. It is also used to restrain
the liquid flow.
See Example: Discharge piping equipment for
illustrations.
If increasers are used, check that they
are installed between the pump and the
check valve.
See Example: Discharge piping equipment for
illustrations.
If quick-closing valves are installed in
the system, check that cushioning
devices are used.
This protects the pump from surges and water
hammer.
Example: Discharge piping equipment
Correct Incorrect
1
2
3
4
1. Bypass line
2. Shut-off valve
3. Check valve
4. Discharge isolation valve
2
1
1. Check valve (incorrect position)
2. The isolation valve should not be positioned
between the check valve and the pump.
Auxiliary-piping checklist
Precautions
WARNING:
• Cooling systems such as those for bearing lubrication and mechanical-seal systems must be operating
properly to prevent excess heat generation, sparks, and premature failure.
• Sealing systems that are not self-purging or self-venting, such as plan 23, require manual venting prior
to operation. Failure to do so will result in excess heat generation and seal failure.
NOTICE:
The mechanical seal must have an appropriate seal-flush system. Otherwise, excess heat generation and
seal failure can occur.
Installation
Models 3180, 3181, 3185, and 3186 Installation, Operation, and Maintenance Manual 41