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YEOMANS BROTHERS COMPANY
19" N. RUBY STREET MELROSE PARK, ILLINOIS
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The Yeomans Rotary Distributor
shown on the cover and above is
installed at Newport, Tennessee.
The W diameter distributor has a
capacity of 1500 to 4500 gpm.
The function of a trickling filter is the oxidation
of organic matter and the biological coagulation
of finely divided solids, normally used as a sec-
ondary step in treating settled sewage. This
function is accomplished principally by micros-
copic organisms thriving in a slime clinging to
the filter media.
The Rotary Distributors described in this cata-
log can be used successfully in any trickling
filter system regardless of the application —
sand filter, standard rate filter, high rate filter,
or the celebrated Aero-Filter System.
index .page
types, sizes, capacities ....................
..3
distributor operation ........................
...4
installation drawing .........................
...5
center columns, mercury seal ...............
...6
center columns, mechanical seal ......•••••
...7
nozzle designs available ...............•••
.• 8
armsand trusses ............................
...9
the Aero-Filter system ......................
..9
typical specifications .......................
•10
other Yeomans products ••••••••••••••••••••
12
sales and service offices ...................
•12
1 I Copyright, 1965, Yeomans Brothers Company

types
available
The hydraulically driven distributor line detailed
in this catalog offers engineers a complete com-
bination of 'components, and allows specification
of the most efficient and economical unit for each
particular application.
Recognizing the merits of both the mercury and
mechanical seal for center columns, Yeomans has
a complete range of sizes in each type. Further,
three types of nozzles have been developed to
meet the number of specific applications of a
rotary distributor. Each type of nozzle can be
furnished in a range of sizes or orifice openings.
Distinguishing features of all Yeomans Distributors
regardless of the combination of components are
the low operating heads made possible by the
large openings and elimination of restrictions to
flow; the efficient bearing arrangement that mini-
mizes resistance to rotation but gives maximum
stability to the entire machine.
sizes,
ca aci
p ies
Yeomans Distributors can be furnished for any
sewage flow within practical limits, to provide
uniform distribution on trickling filters up to 200 .
feet in diameter. A table of column sizes and ca-
pacities is shown on Pages 6 and 7. For sewage
flows too low to insure rotation of these machines
Yeomans recommends the use of the "Water -Wheel"
Distributor, described in a separate catalog.
10 inch center column
Model M168

operation
The method of supplying sewage to a rotary distributor
will depend on the engineer's overall scheme for the
plant layout and the hydraulic gradient available at
each particular installation.. The principal means of
supplying sewage to a rotary distributor are: applica-
tion through a dosing siphon; direct gravity feed; and,
pumping directly to the center column.
Dosing siphons are incorporated where it is desirable
or necessary to apply a uniform dosage and/or secure
intermittent dosing and rest cycles. A dosing siphon
will prevent flows coming to the distributor below the
minimum operating rate for a given machine.
The most common method of supplying sewage to a
rotary distributor is direct gravity feed. Sufficient
static head must be available between the center line
of the distribution arms and the preceding holding
point to afford proper operation of the machine (be-
tween the required flow range) with the forces created
by hydraulic reaction. Where excessive flow variation
is present, the periods during low flow may be aug-
mented by recirculation.
Where a particular plant layout or plant topography will
not lend itself to gravity flow, the sewage is pumped
directly to the rotary distributor. A rotary distributor
is a hydraulic flow control device, the pumps and the
distributor working as a well -coordinated team. Both
the pumps and the distributor should be furnished by
Yeomans to afford proper selection of the pump impel-
ler and number, and size of nozzles on the distributor.
center
columns
The center column consists of a stationary column and
a rotating manifold. The entire weight of the revolv-
ing mechanism is transmitted to -the stationary column
by a heavy-duty, anti -friction, spherical roller thrust
bearing, mounted at the upper junction of the station-
ary column and the rotating manifold. The revolving
parts are steadied against the stationary central sup-
port at the bottom of the manifold by a sleeve bearing
or by ball -bearing type guide roller bearings.
A rotary distributor requires a head of water on the
nozzles to rotate the machine. The lower junction of
the revolving mechanism and the stationary support
must be sealed to prevent the escape of sewage.
8 inch center column
Model M168
�i
4

typical installation
BASE PLATE CENTER COLUMN
SEAL RING ANCHOR BOLTS
NOZZLE
i
END GATE TRUSS RODS
TOP OF FILTER MEDIA
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DRAIN VALVE
i WA'3S
FIG. 1

NEOPRENE
SPRING LOADED
MECHANICAL
SEAL
MERCURY SEAL
CHAMBER
CROSS SECTION
DRAWING OF
6-INCH CENTER
COLUMN
MODEL 6-MI47
Series 'M" Distributors
HEAVY-DUTY .
THRUST
BEARING
ROTATING
mercury seal units
IA MANIFOLD
Mercury seal center columns are fitted with
Fr '
an extended skirt on the rotating manifold that
'
divides a deep well in the stationary column.
This well is filled with mercury and forms a
water -tight and air -tight seal. Should an un-
usual head of liquid inside the pillar force
mercury out of the seal chamber, the mercury
is retained in an annular safety catchchamber,
i
and is automatically returnedto the seal cham-
ber when the head returns to normal. The
mercury seal will withstand approximately
GUIrRETURN
7'-0" head on centerline of distributor arms.
LERS
Note: Unless special provisions are made, a
mercury seal center column should not be used
where liquid is pumped directly to the center
FETY
column.
ITH
The range in Type "M" center columns, as
TS
given in the table of sizes, permits the most
economical selection to fit the particular plant
\
hydraulics and filter bed requirements.
STATIONARY CENTER
COLUMN
CENTER COLUMN SIZES
Column
Size
Inches
Type
Max.
Cap.
GPM
Max.
Arm
Size
Max.
Number
of Arms
Max.
Bed
Dia.
Construction
6
M147
525
5"
4
29'0"
Cast Iron
6
M157
525
5"
4
86'0"
Cast Iron
8
M168
950
5"
4
86'0"
Cast Iron
10
M168
1475
5"
4
110'0"
Cast Iron
10
M358
1475
4"
6
110'0"
Fab. Steel, C.I. Manifold
10
M168
1475
5"
6
110'0"
Cast Iron
12
M358
2110
6"
6
110'0"
Fab. Steel, C.I. Manifold
14
M168
2875
8"
4
120'0"
Cast Iron
14
M358
2875
5"
8
120'0"
Fab. Steel, C.I. Manifold
18
M358
4760
8"
8
150'0"
Fab. Steel, C.I. Manifold
18
M957
4760
14"
4
Fab. Steel, C.I. Manifold
' ' Refer to Factory.
6

Series '0' Distributors
HEAVY-DUTY
THRUST BEARING
mechanical seal
The Yeomans mechanical seal center column
offers double protection. First, the upper sec- ROTATING
tion of the, seal is packed with grease, which MANIFOLD
acts as a buffer to prevent grit from coming
in direct'contact with the upper mechanical
seal. Second, the lower section of the seal
is an oil chamber, which encases a large
bronze bearing.
The mechanical, spring loaded, neoprene seals
forming the oil bath for the lower bearing,
will not "blow" or leak under excessive heads
or pump surges, and are friction -free, so as
_
not to impair distributor rotation. The oil
NEOPRENE
chamber provides lubrication for the bearing
SPRING -LOADED
and lower seal to minimize friction, prevent
MECHANICAL
wear and provide year -in, year -out, trouble -free
SEAL
operation. A sight oiler is provided to afford
visual inspection of the oil level. Five sizes
are available as shown in the table, giving the
engineer an adequate selection. The mechani-
BRONZE GUIDE
cal seal will withstand approximately 10'-0"
BEARING
head on centerline of distributor arms.
CENTER COLUMN SIZES
Type
Max.
Cap.
GPM
Max. -
Arm
Size
Max.
Number
of Arms
-Max.
Bed
Dia.
Construction
0147
525
5".4
29'0"
Cast Iron
I
0157
525
5"4
86'0"
Cast Iron
0257
1475
8"4
or 6
70'0"
Fab. Steel
0358
1475
- 8"
4
150'0"
Fab. Steel, C.I. Manifold
0358
2110
10"
4
175'0"
Fab. Steel, C.I. Manifold
SIGHT
OILER
NEOPRENE
SPRING LOADED
MECHANICAL
� SEAL
GRENSE SEAL
CHAMBER
OIL CHAMBER
STATIONARY CENTER
COLUMN
CROSS SECTION
DRAWING OF
6-INCH CENTER
COLUMN
MODEL 6-0147

The selection of the number, size and type of nozzles
to be used on each distributor is based on the hydrau-
lic calculation for that particular project. After the
number of nozzles has been selected, the spacing of
the nozzles on each distributor arm is located graph-
ically, thus providing an even distribution on each
square foot of surface area.
FIG. 2 DIE-CAST NOZZLE
FIG. 3 ROUND ORIFICE NOZZLE
FIG. 4 AERO NOZZLE
nozzles
DIE-CAST NOZZLE
This nozzle is an aluminum alloy casting. The smooth
bore permits a good discharge through the nozzle even
at low flow and minimizes clogging. The spreader
plate is pivoted on the nozzle casting and is adjust-
able. An oval shape assures maximum distribution
over the bed. This nozzle is used on the smaller ma-
chines and on standard rate and sand filters.
ROUND ORIFICE NOZZLE �
This nozzle consists of a stainless steel orifice and
a fixed spreader plate which is held in position by the
orifice nozzle. The spreader plate projects upward
from the bottom of the nozzle and is arranged to allow
full view of the orifice for cleaning without moving
the plate. The position and shape of the spreader
plate gives excellent spread of the orifice delivery
without robbing reaction force. This nozzle is used
on the larger machines and on high rate distributors.
AERO NOZZLE
The Aero nozzle assembly is composed of a series
of parts. The nozzle bowl and removable cap are alu-
minum alloy. The saddle that holds the nozzle to the
distributor arm is cast iron. Ejection of liquid is away
from the arm and in an upward and outward direction.
The ejected liquid forms a large oval umbrella -like
pattern to accomplish a raindrop application on the
surface media. Designed for Aero-Filter distributors,
it may also be used on other machines.

Typical
general
There shall be furnished and installed a MELIt_ (mechanical or
mercury) seal type rotary distributor for the ��_ ft. diameter
trickling filter bed(s) shown on the plans and as specified herein.
Each distributor shall be as manufactured by Yeomans Brothers
Company of Melrose Park, Illinois.
Each distributor shall be capable of handling flows ranging from
52_gpm minimum to 11,:'-5,_gpm maximum.
center column
The stationary center column shall be not less than
inches in diameterand shall be heavy cast iron or fabricated steel
with flat base*, suitable for mounting on a hollowconcrete center
pier. Ample port areas shall be provided to permit unrestricted
flow from the stationary column to the rotating manifold. The
rotating manifold shall be of heavy cast iron or fabricated steel
with suitable machined parts for installation of the number and
diameter arms specified below.
The radial and axial loads of the revolving mechanism shall be
transmitted to the stationary column by a heavy duty, anti -friction,
spherical roller thrust bearing mounted in the upper bearing
housing at the upper junctions of the stationary columns and the
rotating manifold. A dual tandem spring -loaded seal shall be
provided to seal off the upper bearing housing from the liquid in
the rotating column. A fitting shall be provided in the upper
bearing cap, so that the ball bearing housing can be kept con-
stantly full of lubricant.
seal
There shall be furnished: (Use either A or B).
A. Mercury Seal — An extended skirt on the rotating manifold
to provide the deep well in the stationary column. This well
shall be filled with mercury to form a water -tight and air -tight
seal at the bottom junction of the rotating and stationary col-
umn. An annular catch chamber with return ports shall be pro-
vided to prevent loss of mercury due to sudden excessive head.
The lower steady bearing shall consist of four lubricated
bearings.
B. Mechanical Seal — A lower guide bearing of cast bronze,
accurately machined to prevent undue friction. Mechanical,
spring -loaded, neoprene seals shall enclose an oil chamber
between the stationary column and the rotating manifold and
shall provide an oil bath for the lower bearing. These seals
shall be designed for operation under ten feet or more head
without leakage and shall be unaffected by surges. An oiler
.shall .be provided\ for filling the oil chamber and for visual
inspection of the oil level. A grease seal shall be provided
above the upper mechanical seal to prevent sewage or solids
from contacting the oil chamber.
10

Specifications
arms & trusses
The machine shall be furnished with 2arms, fabricated
from '13 diameter standard weight Satr�l (Two
diametrically opposite arms shall be fitted with box type, fab-
ricated steel, overflow boxes with wooden baffles.) Arms shall
be furnished with removable 20009°0'"noizles properly spaced
for even distribution of the sewage over the filter bed. Each
arm shall be equipped with a quick -opening end gate for flush-
ing of the arms.
The arms shall be supportedby steel truss rodswith turnbuckles.
Steel stay rods with adjustable turnbuckles shall be furnished to
stay the arms laterally. The trusses shall be designed for a
maximum load consisting of their own weight, the weight of the
arms when full of liquid, a coating of ice 1/4" thick, wind load-
ing and a live' load of 300 lbs. at any point on either arm. No
guy wires or cable will be permitted In the trusses or stay
braces. The rotary distributor' shall receive one shop coat of
Inertol #621 before shipment and two field coats of machinery
enamel after erection.
dosing siphon ►J`�
There shall be furnished and installed In the dosing chamber as
shown on the plans dosing siphon(s) as manufactured
I
y Yeomans Brothers Company of Melrose Park, Illinois.
Each dosing siphon shall consist of a heavy cast iron or gal-
vanized fabricated steel siphon bell with suitable pipe connec-
tions for the siphon breaker trap pipe and the siphon seal pipe.
The siphon shall be supported by the top of the diameter
feed pipe and shall be designed to operate at the head condi-
tions indicated on the plans.
All air piping shall be of the proper size and shall be furnished
by the equipment manufacturer. The feed and riser pipe shall
be furnished by the contractor.
' Duckfoot or base elbow with or without Yeomans leveling ring
can be furnished as optional equipment.