Dresser RCS Manuel d'instructions - Page 6

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1. Maintenance/Replacements

i i :

Need for an inlet silencer will depend on blower speed

and pressure, as well as sound-level requirements in the

general surroundings. An inlet filter is normally recom-

mended, especially in dusty or sandy locations, for blower

protection. A discharge silencer is also normally sug-

gested for RCS blowers. Specific recommendations on

silencing can be obtained from the nearest Sales Office.

Discharge piping requires, a pressure relief valve,

and should include a manual unloading valve to permit

starting the blower under no-load conditions. Reliable

pressure/vacuum gauges and good thermometers at both

inlet and discharge are recommended to allow making the

important checks on blower operating conditions. The

back-pressure regulator shown in Figure

is useful main-

ly when volume demands vary while thE) blower operates

at constant output. If demand is constant, but somewhat

lower than the blower output, excess may be blown off

through the manual unloading valve.

In multiple blower installations where two or more

units operate with a common header, use of check valve is

necessary. These should be of a direct acting or free swing-

ing type, with one valve located in each line between the

blower and header. Properly installed, they will protect

against damage from reverse rotation caused by air and

material back-flow through an idle blower.

After piping is completed, and before applying power,

rotate the drive shaft by hand again. If it does not move

with uniform freedom, look for uneven mounting, piping

strain, excessive belt tension or coupling misalignment.

DO NOT operate the blower at this time unless it has been

lubricated per instructions. Read LUBRICATION sec-

tion.

LUBRICATION

A very simple lubrication system is employed in RCS

blowers. All friction parts - gears, bearings and oil seals

- are lubricated by the action of oil slingers which dip in-

to the main oil sumps causing oil to splash directly on

gears and bearings and also to fill the small reservoirs

above the bearings. From these, oil flows, by gravity,

through the bearings and to the oil seals. A drain port is

provided below each bearing to prevent an excessive

amount of oil in the bearings. Refer to assembly drawings,

Figures 6 & 7. Entrance of lubricating oil into the blower

air chamber is prevented by the use of double shaft seal-

ing. Lip type seals, located inboard of the bearings in each

headplate, effectively retain oil within the sumps. Any

small leakage that may occur, should the seals wear,

passes into a cavity in each headplate that is vented and

drained downward. In addition, sealing rings are provided

on both shafts where they pass through the inner walls of

the headplates. These serve to reduce air leakage from or

into the air chamber and also minimize oil carryover into

the air chamber. They are not sufficiently effective to

enable the blower to handle gases, however.

Oil sumps on each each end of the blower are filled by

removing top plugs, Item

(22),

and filling until oil reaches

the middle of the oil level gauge, Item

(45).

See Figure 3.

Filling the sumps should be accomplished with the

blower not operating, in order to obtain the correct oil

MAXIMUM - - - - + 1

oPfRAilNG

LEVEL

M I HIM U M - - - - + I - ' "

Figure 3 -

Oil Level Gauge

level. Approximate oil quantities required for blowers of

the various configurations are listed in Table 3. Do not

overfill. A good grade of industrial type non-detergent,

anti-foaming, rust inhibiting oil should be used.

The level should never be allowed to fall below the oil

level gauge ring when the blower is not operating. It may

rise on the gauge during operation, to an extent depend-

ing somewhat on oil temperture and blower speed, but it

should not be permitted to rise above the oil level gauge

ring.

During the first week of operation, check the oil levels

in the oil sumps about once a day, and watch for leaks.

Replenish as necessary. Oil should be changed after initial

100 hours of operation. Thereafter, change periods of about

500 hours may be considered normal. In draining the sumps,

remove plugs

(22)

at the bottom.

Ambient

Viscosity

Approximate

Series

SSU At

tOO°F. (37.8°C)

SAE No.

Above

90°F. (32°C)

1000-1200

32-90

F. (0-32°C)

700-1000

0-32°F. (-18-0

500-700

Table 2 -

Recommended Oil Grades

Gearbox

Drive End

Fl.

Oz.

(Liters)

Fl.

Oz.

(Liters)

(1.48)

(.089)

(0.53)

(2.84)

(1.89)

(0.95)

Table 3 - Oil Sump Capacities

OPERATION

Before operating a blower under power for the first

time, recheck the unit and the installation thoroughly to

reduce the likelihood of avoidable troubles. Use the follow-

ing procedure list as a guide, but consider any other

special conditions in the installation.

1. Be certain that no bolts, tools, rags or dirt have been

left in the blower air chamber.

2. Be certain that inlet piping is free of any debris. If an

outdoor intake witout filter is used, be sure the opening

is located so it cannot pick up dirt and is protected by a

strong screen or grille. Use of the temporary protective

screen at the blower as described under INST ALLA-

TION is strongly recommended.

3. Recheck blower leveling, drive alignment and

tightness of all mounting bolts if installation is not re-

cent. If belt drive is used, adjust belt tension correctly.