ILRB-3000 GEA20261
RAS and RAS-J WHISPAIR Blowers
Page 6 of 33
Installation
Supervision of the installation by a Howden Roots service
engineer is not usually required for these units. Technicians
with general experience in installing heavy machinery
should be able to produce satisfactory results. However, a
Howden Roots service engineer may be engaged for
assistance or for final checking of an installation.
Note: The information contained in this manual is intended
to supplement more detailed discussions of foundations
and piping found in API recommended practice 686 and the
Compressed Air and Gas Handbook, published by the
Compressed Air and Gas Institute, New York City, and the
American Petroleum Institute, Washington, D.C.
Location
Because the unit is completely enclosed, the location of the
installation is typically not critical. While a clean, dry, and
protected indoor location is preferred, an outdoor location
will generally provide satisfactory service. Important
requirements are that the correct grade of lubricating oil be
provided for the expected operating temperatures, and that
the unit is located so that routine checking and servicing
can be conveniently performed.
Protection
As indicated by markings on the flange covers, the internal
machined surfaces of Roots blowers are treated with a
vaporizing inhibitor after factory assembly to protect against
normal atmospheric corrosion. Protection against chemical
or saltwater atmosphere is not provided.
The maximum period of protection is one year under
average conditions, if flange covers and closing seals are
not removed. Leave covers and tape seals over all
openings as long as possible during installation to avoid
loss of protection.
If there will be an extended period between installation and
start-up, take the following steps to ensure corrosion
protection:
1. Coat the insides of the cylinder, gearbox, and drive end
bearing covers with a vapor phase rust-inhibiting liquid
such as Nox-Rust VCI-10 or equivalent. Repeat once a
year or as conditions require. VCI-10 is oil soluble and
does not have to be removed before lubricating. If desired,
Nox-Rust VCI-10 may be removed from within the cylinder
shortly before start-up by spraying a fi ne 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. Nox-Rust VCI-10 may be obtained from Daubert
Chemical Co., 2000 Spring Rd., Oak Brook, IL, 60521.
2 Paint the shaft extension, inlet and discharge flanges,
and all other exposed surfaces with Nox-Rust X-110 or
equivalent.
3 Seal the 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 Nox-Rust VCI-
10 vapor will escape and lose its effectiveness.
4 Protect the equipment from excessive vibration during
storage.
5 Rotate the drive shaft three or four revolutions every two
weeks.
6 Prior to startup, remove the fl ange covers on both the
inlet and discharge and inspect the interior to ensure the
absence of rust. Check all internal clearances. Also,
remove the gearbox and bearing covers and inspect the
gear teeth and bearings for rust.
Before connecting the piping, remove the main flange
covers and inspect the blower interior for the presence of
foreign particles or dirt adhering to machined surfaces. Use
petroleum solvents to carefully wash away any material
found and then manually rotate the impellers to ensure that
they turn freely. Use the same solvent to remove the
antirust coating from the fl ange faces and any other
surfaces. Note: Interior cleaning is not required if no dirt is
found.
Equipment Handling/Lifting
Handling of the Root blower equipment needs to be
accomplished with care, and in compliance with safe
practices. The weight of a bare unit, without the base plate,
driver, or accessories, ranges from about 1 ton (910 kg) for
the smallest units to approximately 7 tons (6350 kg). On
RAS and RAS-J units, an eyebolt is provided near each
end for lifting. Units mounted on a base plate have greater
weight and should always be handled using the four lifting
hooks provided.
Check the eyebolts for tightness, by tapping with a
hammer, before lifting the equipment by the eyebolts. Make
sure to pull the bolts in a nearly vertical direction when
lifting. To ease the side strain caused by a large cable
angle, place a stiff spreader between the eyebolts and
adjust the cable lengths so that the unit is approximately
level during the lift.
Note: A harness with four lifting hooks is required to lift
base-mounted units. After inserting the hooks in the lifting
lugs, block the chains out on the sides to avoid placing the
unit under strain. At the same time, adjust the lengths to
produce a level lift.
Foundation
Because many factors, including local soil conditions,
impact the foundation design, this section offers only a
ILRB-3000 GEA20261 RAS and RAS-J WHISPAIR Blowers.pdf 6
03/09/2015 13:21:26
Summary of Contents for Roots RAS Whispair
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