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7.6 Shutdown Periods
For a brief standstill period of 2 to 3 weeks, take the
following precautionary measure:
Rotate the shaft of the machine a few turns at least
once a week. This helps prevent the formation of rust
between the parts and reduces the risk of possible
jamming.
For a longer standstill period, there is two options:
Machine remains connected to the system or removed
for storage.
For stainless-steel machines, no special preparations
are required.
For machines with parts that are not corrosion-
resistant (all other material variants), follow these
steps: a. Neutralize the machine using a harmless fluid
such as clean water, which is safe for both the machine
and the process. b. Drain the machine as described in
Section 5.3.
Note: The periods/intervals for these measures may
need to be adjusted based on environmental
conditions such as high humidity, salty air, or
dusty/sandy air. Please refer to Table 5 for preservative
quantities. If uncertain, it is recommended to contact
NES Service for further guidance.
Model
NBE3/NBE4 30
NBE3/NBE4 32
NBE3/NBE4 40
NBE3/NBE4 42
NBE3/NBE4 50
NBE3/NBE4 52
NBE3/NBE4 60
NBE3/NBE4 62
NBE3/NBE4 67
NBE3/NBE4 72
Table 5: Preservative Quantity
NBE O & M Document No. NES/NBE/O&M
Preservative
Required
(Gallons)
0.5
0.7
0.8
1.2
1.3
1.6
1.85
2.1
2.9
3.7
If the pump is shut down for 2 to 3 weeks, rotate the
vacuum pump and recirculating pump (if applicable)
by hand at least once every week to prevent rust
buildup between cast iron parts, which could lead to
seizing.
If the pump needs to be taken out of service for a
period ranging from 3 weeks to one year and it is a
standard cast iron or all-cast iron pump maintained in
covered storage, follow the preservation procedures
outlined below:
1. Remove all pipe plugs and drain the pump as
thoroughly as possible. Rotate the shaft by hand 5 to
10 revolutions after draining to remove remaining
moisture.
2. Replace the drain plugs and pour in the specified
amount of preservative as listed in the provided table.
Fill the pump through the flange or inspection
openings.
3. Rotate the shaft by hand 5 to 10 revolutions. Install
flange covers and seal covers with tape.
4. Brush or spray Houghton's Rust Veto #342 (or
equivalent) onto all exposed machined, ferrous
surfaces, including flange faces and shaft surfaces.
Allow it to dry.
5. Pumps with carbon steel shafts should receive
additional treatment with Houghton's Rust Veto
#342 or equivalent.
6. After preservation, remove the stuffing box packing
and lantern gland (if applicable). Blow and wipe away
any remaining water. Apply Rust Veto #342 or
equivalent to the shaft surface and reinstall new
packings.
7. Rotate the pump shaft by hand at least once every
month to prevent the formation of rust between tight
tolerances and avoid pump seizing.
Note: If the Cortec VCI-379E preservative is used,
which is a waterborne vapor phase corrosion
inhibitor, flushing before start-up is not required for
pumps preserved with this material.
Page 30 of 43
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