Dresser Roots DVJ WHISPAIR, Installation Operation & Maintenance

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  Dresser Roots

removed before lubricating. If desired, VCI-10 may be 
removed from within the cylinder shortly before start up 
by spraying fine mist of petroleum solvent through the 
blower while it is running at a slow speed with open inlet 
and discharge, or it can remain in the blower if it is not 
harmful to the operation of the connected system. VCI-
10 is a product of Daubert Chemical Co., Oak Brook, IL.

2.  Paint shaft extension, inlet and discharge flanges, and 

all other exposed surfaces with Nox-Rust X-110 or 
equivalent.

3.  Seal inlet, discharge, and vent openings. It is not 

recommended that the unit be set in place, piped to the 
system, and allowed to remain idle for extended periods. 
If any part is left open to the atmosphere, the VCI-10 
vapor will escape and lose its effectiveness.

4.  Units are not to be subjected to excessive vibration 

during storage.

5.  Rotate drive shaft three or four revolutions every two 

weeks.

6.  Prior to start up, remove flange covers on both inlet and 

discharge and inspect internal to insure absence of rust. 
Check all internal clearances. Also, at this time, remove 
gearbox and bearing covers and inspect gear teeth and 
bearings for rust.

When ready to connect piping, remove main flange covers 
and inspect blower interior for presence of foreign particles or 
dirt adhering to machined surfaces. Clean out such material 
by washing carefully with a petroleum solvent then rotate 
impellers manually to make sure they turn freely. Also use 
the same solvent to remove the anti-rust coating from flange 
faces and any other surfaces. 

Note:

 interior cleaning is not 

required if no dirt is found.

FOUNDATION

 design depends on local soil conditions and 

several other factors and can only be discussed generally 
here. Additional information will be found in the publication 
referred to at the beginning of this section. For satisfactory 
operation of supported equipment, a concrete foundation 
must be rigid, must have minimum defections, and must be 
free from resonant frequencies in the operating speed range 
of the equipment.
Length and width dimensions of the foundation should 
provide at least 6 inches (150 mm) from any edge to the 
nearest machine anchor bolt, as located from the certified 
manufacturer’s general arrangement drawing. Depth 
dimension should be determined by design, but a minimum 
practical depth is considered to be twice the distance 
between shaft centers (or gear diameter) of the unit, or 
sufficient depth to attain a concrete mass a minimum of 1-1/2 
times the weight of the blower and motor. The concrete 
block should be permitted to cure for a minimum of 28 days 
before the blower is grouted in place. Any block distortions 
during curing then will have little or no affect on equipment 
and alignment. To simplify machine leveling and provide good 
grouting bond, the top of the foundation should be struck-off 
as level as possible but left with a rough surface.
Spring-type vibration isolating mounting are 

not recommended

for use directly between the operating equipment and the 
foundation. Where such mountings are required, they should 
be designed to carry a reinforced concrete slab on which the 
equipment is mounted. This slab must have good rigidity against 
bending and twisting, and the suspension system will require 
careful adjustment to produce a reasonably level condition 
during operation. All piping will require flexible sections and 
supports to reduce connection strains on the unit to a minimum.
Direct use of structural framing members for mounting 

is not 

recommended

. If unavoidable, it should be restricted to 

units of the smaller frame sizes, and spring-type mountings 
should not be used. Structural members must be rigid, and 
will probably require reinforcement if part of a building. Noise 
transmission can be reduced by use of a cork isolating pad. 
This can be 1 to 2 inch (25-50 mm) thickness, bedding on 
a full steel plate attached to the structure and carrying rigid 
concrete slab on which the equipment is mounted.

ANCHOR BOLTS

 are to be placed within the foundation 

forms before concrete is poured. Foundation bolts installed 
as shown in Figure 2, with diameter and length as in Table 2 

are recommended. The bolts must be located as accurately 
as possible from dimensions on certified installation drawing. 
To obtain a bolt location tolerance of 1/8" (3mm), use of 
drilled templates firmly secured to the foundation forms is 
recommended.
The bolt sleeves shown, if kept centered around the bolts 
and free of concrete, will allow bolts to be sprung enough to 
correct for small variations in bolt setting and machine drilling. 
The sleeves are filled in the final grouting operation. Bolt 
positions should be adjusted vertically so that the top ends 
will extend at least 1-1/2 diameters above the soleplate or 
taper washer, or as shown on the installation drawing.
Jack screws are provided to make leveling the height adjust-
ments easier. Steel plates, approximately 4" x 4" x 1/2 " (100 x 
100 x 13 mm) should be placed on the foundation under each 
jack screw location. Plates and anchor bolts are not furnished 
as standard accessories.

LEVELING

 is very important and should be performed with 

care, using a good machinists level having a ground glass 
bubble vial. A setting as level as possible in all directions is 
the result to be worked toward. Blowers should be leveled 
from drive shaft and pipe flanges. Machined baseplates 
have pads running in both length and width directions. On 

Figure 2 - Typical Anchor Bolt Detail