Westinghouse 5026 User manual

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CROSS COMPOUND
STEAM DRIVEN
AIR COMPRESSORS
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INSTRUCTION PAMPHLET
No. 5026
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JUNE, 1940
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(SUPERSEDING ISSUE OF NOYEMBEl<. 1937)
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COPYRIGHT. 1940 BY THE
WESTINGHOUSE
AIR' BRAKE COMPANY
PIITSBURGH, PA.. U. S. A.
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CONTENTS
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TITLE PAGE
Cross Compound Air Compressors. . . . . . . . . . . . . . . . 5
8112" Cross Air 7
Description 9
Old and New Standard Air Compressors ....... , . 15
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10112" Cross Compound Air Compressor. . . . . . . . .. 17
Operation of Cross Compound Air Compressors. . .. 18
Type "G" Air Filter. . . . . . . . . . . . . . . . . . . . . . . . . . .. 25
No. 54 Air
............................ 26
General Data 30
Installation and Operating Instructions ...... , . . .. 33
Type "F-I-A" Lubrieator ...................... 43
Repair and Road Tests. . . . . . . . . . . . . . . . . . .. 55
Test of Steam End ............ ............ 59
Disorders . . ........ ,......................... 62
Maintenance .................................. 65
Cleaning the Type "Gil Air Filter. . . . . . . . . . . . . . .. 70

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Fig. 1. Front View of the 8Y2u Cross Compound Air Compressor
with "F-I-A" Lubricator and Type "G" Air Filter
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Cross Compound Air Compressors
NOTE-The reference numbers shown herein are for con-
venience only and are not to be used when ordering repair parts.
See Part Catalog giving piece numbers. etc.
It is generally recognized that the duty imposed upon
the locomotive air compressor has very largely increased
from year to year,
but the extent of this increase is more
fully appreciated when the following factors are con-
sidered:-
(a) The development of locomotives of great
weight and tractive power and
in consequence longer
trains
of heavy, large capacity cars.
The large brake cylinders and reservoirs
required for the heavier cars, the longer brake pipe
due to the longer trains hauled, and the greater num-
ber
of flexible connections and fittings where leakage
may occur, combine to demand normally a larger
volume of compressed air than ever before.
(c) The growing use
of many pneumatically
operated auxiliary appliances, such as water scoops,
automatic ash pans, engine reversing appliances,
Pullman water raising system, bell ringers, etc.,
which
take their supply from the air compressor.
(d) The necessity
of avoiding delays at termi-
nals where traffic tends to congest, by a prompt
charging
of long trains. Present day service con-
ditions demand a compressor of ample capacity to
secure maximum brake efficiency.
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Fig. 2. Rear View of the 8%/1 Cross Compound Air Compressor
with "F-I-A" Lubricator •
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SJ;2"
CROSS COMPOUND
AIR COMPRESSORS
The Westinghouse 8%" Cross Compound Compressor
was developed for the specific purpose of combining
maximum capacity and highest efficiency,
by compouna-
ing both the steam supplied and the air compressed to
the extent
that, while this compressor has a capacity
over three times greater
than the well known 9%" single
stage compre3sor, the steam consumption per 100
fpet of air compressed is
but one-third.
The
8%" compressor is supplied in two sizes. The
8%"-150, ordinarily used in steam road service, has a
normal displacement of 150 cubic feet when operating on
200 pounds steam pressure. The
8%"-120 was designed
to operate on a lower steam pressure, and has a normal
displacement of 120 cubic feet when operating on 160
pounds steam pressure.
While the cross compound air compressor was orig-
inally designed to operate on saturated steam
at a
maximum of 200 pounds pressure, the introduction of
superheat steam and higher pressures was later respon-
sible for modifications providing operation on steam
pressures up to
275 pounds.
The present recommended
standard 8%"-150-D air
compressor is suitable for use with both
saturated and
superheat steam up to
300 pounds pressure.
A Special air compressor, known as the
8%"-150-S,
is available for steam pressures up to 400 pounds
pressure.
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!kcl;(ll'l A-A i:A!SfUed
Sectron DD
Rekef Vahe
Fig. 3. Sectional View of Compressor Showing the Present
Standard Piston Type Reversing Valve
Description
As in the case of the standard Westinghouse Single
Stage Air Compressors, the steam cylinders are placed
vertically above the air cylinders and connected by a
common center piece, see exterior views, Figs. 1
and 2.
The sectional assembly view, Fig. 3, serves to illus-
trate the simplicity of this design and emphasize the
the cross compound compressor
is a serial
arrangement of two standard single stage compressors,
actuated by the same controlling mechanism,
and
moving uniformly in opposite directions. This
illustration also the few moving parts employed,
which comprise
(a), the high pressure steam and low
pressure air pistons, connected by a Nickel-Chrome steel
piston rod drilled for the reversing valve rod which oper-
ates the reversing valve,
and which in turn actuates the
main
piHton valve controlling the admission of steam to
and the exhaust from both the high and low pressure
steam cylinders; and
(b), the low pressure steam and
high pressure air pistons connected by a solid Nickel-
Chrome steel piston rod having
no mechanical connection
with the valve gear.
The drain cock
63 is intended to draw off any con-
densation in the steam passage and should always
be
opened when the compressor is first started. The drain
cocks 64, connected to both steam cylinders, are for
the
same purpose and should also be opened for a short time
before the compressor is started
so that any condensation
of steam in the cvlinder
may be removed.
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