William Hyslop Fuller.

Specifications for two horizontal direct-acting compound screw engines for U.S.S. Charleston, of 3,730 tons displacement, the engines, with their auxiliaries of 7,500 I.H.P. under forced draught; including boilers, screw propellers and all appendages and appurtenances complete, together with a list online

. (page 1 of 6)
Online LibraryWilliam Hyslop FullerSpecifications for two horizontal direct-acting compound screw engines for U.S.S. Charleston, of 3,730 tons displacement, the engines, with their auxiliaries of 7,500 I.H.P. under forced draught; including boilers, screw propellers and all appendages and appurtenances complete, together with a list → online text (page 1 of 6)
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737 I

M r^fc SPECIFICATIONS

U

:| - y.TWO HORIZONTAL DIRECT-ACTING



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COmPOUND SCREW ENGINES



A




IT. S. S. CHARLESTON.



^' OF 3,730 TONS l^ISPLACEMENT,

vJaf ENGINES, WITH THEIR AIXILIARIES OF 7,500 1. H. P.

1^ I TT V T ) K R F( ) U( \: ! > T)\i\ n ; i i r ;



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l.N( i.l l>lXi




Bgi^jJJB, SCKKW PKOlMn.LKR.S, AND ALL APPENDAl^ES AND
IPflJKTENANCES COMPLETE, J()(iEtHER WITH
^iA LT8T OF TOOL8, INSTKITMENT8, AND

!*'JPLK*ATE PIECES TO BE
^^ FUKNLSHED.



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UC-NRLF



$B 315 h7M



WASHINGTON :

(JOVKKNMENT PRINTING OFFICE.

1886.



A'^



BEKKEIEY

Li: RY

UNIVER-^ITY OF
CALIFORNIA



SPEOIFICATIOI^S

FOR

TWO HORIZONTAL DIRECT-ACTING

COMPOUND SCREW ENGINES

FOR

XJ. S. S. CHA-RLESTOlSr,

OF 3,730 TONS DISPLACEMENT,

THE ENGINES, WITH THEIR AUXILURIES OF 7,500 I. H. P.
Under Forced Draught;

INCLUDINCi

BOILERS, SCREW PROPELLERS, AND ALL APPENDAGES AND

APPURTENANCES COMPLETE, TOGETHER WITH

A LIST OF TOOLS, INSTRUMENTS, AND

DUPLICATE PIECES TO BE

FURNISHED.

JOHPI S. PRELL

Civil & AfechamcatEnginceL

SAN FRANCISCO, CAL.

WASHINGTON:

GOVERNMENT PRINTING OFFICE.
1886.






INDEX.



Page.

A.

Air-pumps 26

Air-pump discharge- valve 30

^* pipe-connections... 28

*' pressure-gauges 42

Air-tight fire-rooms 41

Attachments, boiler 36

Ash-dumps 45

Ash-hoists 45

Ash-pit doors 34

Ash-sprinklers 62

Angles, beams, etc 75

Auxiliary bilge and fire-pump . 43

*^ boiler 42

*^ " attachments.. 43

** ^' feed-pump 47

'^ " uptake and

smoke-pipe 43

Auxiliary engine stop-valves.. 54

" exhaust-pipes 48

*^ feed-pipes 49

^^ feed-pumps 41

^' fire-pump 44

* * steam-pipes 47



Bearers, grate-bar 34

Bearings, reversing quadrant. 14

'^ stern-tube 22

'^ thrust 21

" valve-motion rock-
shaft 14

Bilge-drains, suctions from

6-inch 51

Bilge-drains, suctions from

12-inch 51

Bilge injection-valve 29

^' pumps, main 27

'* suction, direct 51

" valve-boxes 55



Page.

Bilge valve-boxes, suctions

from 51

Bilge and fire-pumps, auxiliary 43

Bleeder-pipes 48

Blowers 42

Blowing-engines 42

Boiler air-cocks 40

*^ attachments 36

^^ auxiliary 42

^' ^^ attachments to 43

" braces 32

'' clothing 40

" drain-cocks 40

'' heads 31

*^ material 31

^^ man-holes and plates .. . 33

^^ protectors, zinc 40

*' pumping-out pipes 52

'' saddles 36

'' shells 31

^^ stop-valves 38

'^ tubes 31

" tube-sheets 31

Boilers, after main 31

^' forward main 30

*^ attachments to main .. 36
*^ and machinery, test of. 68

Bottom blow-pipes 49

"• blow-valves 37

Bolts and nuts 62

Boxes, journals 62

Braces, boiler 32

Bridges-, hanging 34

Bridge-walls 1 34

Bulkheads, shafts through .... 57
*' pipes through 52



Changes in plans 70

Check-valves , 37

II



Ill



Page.

Circulating-pumps 27

Circulating-pump delivery-

valves 29

Circulating-pump engines 27

" '* pipe-connec-
tions 28

Circulating-tubes 40

Clothing, boiler 40

^^ cylinders 11

*' pipe 52

Cocks, boiler, air 40

" '' drain 40

' * cylinder, drain 17

^' gnage 39

" and valves 56

" '' labels on... 56

Condensers 24

Conditions of acceptance 74

Connecting-rods, main 19

'' " valve 13

Combustion-chambers 34

Completed machinery, draw-
ings of 71

Counterbalances, crankshaft _. 21

Couplings, shaft 24

Cover for smoke-pipe 64

Crank-shafts 20

Crankshaft counterbalances . . 21

" pillow-blocks 19

Cross-heads 18

Cross-head slides ,. 19

Cylinder casings, high-pressure 4
^^ ^' low-pressure. 7

'^ clothing 11

*' covers, high-pressure. 5
" ** low-pressure . 9

*' drain-cocks 17

*' linings, high-pressure 5

" man-hole covers 10

" relief- valves 16

Cylinders, bolting together ... 8



D.

Dampers 35

Distilling apparatus 46

Double-bottom valve- boxes,
suction from 51



Drain-pipes and traps 53

Drain-cocks, cylinder 17

" boiler 40

Drawings of completed

machinery 71

Drawings, working 70

Dry-pipes „ 38

Duplicate pieces 65



E,

Eccentrics 13

Eccentric levers 13

^' straps 13

Engine-frame tie-rods 20

Engine-room log-desks 59

^* instruments 58

'^ telegraph 60

Engine stop-valves 18

Engines, blowing 42 .

^' circulating-pump ... 27
^' and gear, turning ... 44

* ' main pumping 26

^' reversing 15

Engines, securing, in ship 66

Escape-pipes 52

Exhaust-pipes, main 25

*^ auxiliary . 48



P.

Failure, cases of 74

Feed-pipes, auxiliary 49

^* main 49

Feed-pumps, auxiliary 41

'' " boiler.. 47

*' main 40

Feed-tank suction-pipes 50

Feed-tanks 30

Fire-rooms, air-tight 41

Fire-pump 44

Floor-plates 57

Furnaces 33

Furnace-doors 33

*^ fronts 33



IV



a.



Page.



Gauge-cocks 39

Gauges, air-pressure 42

<^ steam 39

" water 39

Gear for working valves from

deck 63

Gear, lifting 63

General description 1

Governors 61

Grate-bars and bearers 34



H.

Hand-pumps 44

Hand-rails 58

Heads, boiler 31

Hose connections 49

Hot-well suction-pipes 51

Hull, attachment of valves to. 55

Hydrokineters 40



Indicator fittings and motions 59

Indicators, revolution 60

Injection sluice- valves 29

Inspectors, instructions to.... 72

Inspector's office 70

Instruments, engine-room 58

Instruments and tools 64



J.

Jackets, steam, high-pressure. 5

Jet, injection 30

Joints, riveted 32

Journal-boxes 62



Ladders, engine and fire-room 58
Lamps, supports for 63



Page,

Levers and gear, working 16

Line-shaft 21

^' pillow-blocks 21

Links, radius 13

'^ valve 14

Lifting-gear 63

Log-desks, engine-room 59

Lubrication 61



M.

Main bilge discharge-valves . . 29

^' feed-pipes 49

* ' in j ection- valves 28

*^ outboard-delivery valves 29

'' steam-pipes 47

Man-hole covers, cylinder 10

Man-holes and plates, boiler . . 33

Material, boiler 75

'' and fitting of pipes . 53

'' tests of 68

^' and workmanship .. . 67



Oil-drips 61

Oil-tanks 63

Omissions 71



P.

Painting 69

Pillow-blocks, line-shaft 21

<' crank-shaft 20

'^ thrust-shalf.... 22
Pipe-connections, air-pump .. 28
'* circulating-
pump 28

Pipe-clothing 52

Pipes, auxiliary exhaust 48

'' '' feed 49

" '< steam 47

' ^ boiler, pumping out 52



Page.

Pipes, bottom blow 49

" bleeder 48

" drains and traps 53

" dry 38

" escape 52

^^ feed-tank suction 50

^' liot-well suction 51

^' main exhaust 25

" " feed 49

^^ " steam 47

^' material and fitting of . 53
^' receiver live-steam ... . 48

*' sea-water suction 50

^^ size and thickness of.. . 53

^' surface-blow 49

*' through bulkheads .... 52

Piston-rods 12

Piston-rod stuffing-boxes 12

Piston-valves, high-pressure .. 7
^' low-pressure... 10

Pistons, main 11

Plugs for discharge openings . 55
Ports, steam, high-pressure... 6

*' " low-pressure 9

Propeller-shafts 22

Propellers, screw 23

Pump, auxiliary boiler feed.. . 47

" auxiliary fire 44

** cylinders 62

'* engines, circulating ... 27

Pumps, air 26

" auxiliary bilge and fire 43
'' '' boiler-feed.. 47

'' '' feed 41

*^ circulating 27

'' hand 44

^' main-bilge 27

^* main-feed 40

Pumpin g-engines , main 26

*' out valves 38

" out pipes, boiler 52



R.

Radiators 57

Radius-links 13



Page.

Receivers 11

Receiver live-steam pipes 48

Record of weights 70

Relief-valves, cylinder 16

Reversing-arms 13

^' engines 15

*' quadrants 14

^' quadrant bearings . 14

Revolution indicators 60

Rivets 75

Riveted joints 32

Rock-shafts, valve-motion 14



S.

Saddles, boiler 36

Safety-valves 38

Salinometer pots 39

Screw-propellers 23

Sea-valves 54

Sea-water suction-pipes 50

Securing engines in ship 66

Sentinel- valves 39

Separators 52

Shaft-couplings 24

'' line 21

Shafts, crank 20

'' propeller 22

* ^ through bulkheads .... 57

*' thrust 21

Shells, boiler 31

Siren 56

Slides, cross-head 19

Smoke-pipe 36

'' auxiliary 43

^' cover 64

Speaking-tubes 60

Starting- valves 17

Steam-gauges 39

^' jacket, high-pressure... 5

*^ ports, high-pressure. - . 6

'* '^ low-pressure 9

'* windlass 46

" winch 46

Steel castings, tests of 77

Steel shafts, tests of 76

Stern-pipe stuffing-boxes 23



VI



stern-tube bearings 22

Stuffing-boxes 62

'^ piston-rod 12

" stern-pipe 23

Surface blow-pipes 49

<* blow-valves 37



T.

Telegraphs, engine-room 60

Tell-tales 61

Tests 73

" of boilers and machinery. 68

" of material 68

*^ of steel castings 77

" of steel shafts 76

" preliminary, and trials.. 69

Test, quenching 74

Throttle-valves 18

Thrust-bearings 21

Thrust-shafts 21

Thrust-shaft pillow-blocks 22

Tie-rods, engine-frame 20

Tools and instruments 64

Traps 53

Tube-sheets, boiler 31

Tubes, boiler 31

" circulating 40

" speaking 60

Turning-engines and gear 44



U.

Uptake, auxiliary boiler 43

" doors 35

Uptakes, main boiler 35



Valve-boxes, bilge-suction 55

^* chests, high- pressure .. 6
*' chests, low-pressure 9



Page.

Valve-chest linings, high-pres-
sure 6

Valve-chest linings, low-pres-
sure 9

Valve connecting-rods 13

^' gear 12

" links 14

^ ^ motion rock-shafts 14

" " rock-shaft bear-
ings 14

Valve-stems, high-pressure 7

^^ low-pressure .... 10

ValveSj air-pump discharge... 30

'* attachment of to hull. 55

'^ auxiliary engine-stop. 54

" bilge-injection 29

^< boiler stop 38

'' bottom-blow 37

*^ circulating pump-
delivery 29

Valves and cocks 56

'' '' labels on.... 56

" check 37

'' cylinder relief 16

^* engine stop 18

" gear for working from

deck 63

Valves, injection-sluice 29

'^ bilge-discharge, main . 29

*^ main-injection 28

^* main outboard-deli very 29
^^ piston, high-pressure . 7
*^ piston, low-pressure ..10
'^ pumping-out, boiler .. 38

" safety 38

** sea 54

'' sentinel 39

" starting 17

^* surface-blow 37

" throttle 18

Ventilators 64



W.

Water-gauges S9

*^ service 50

Weights, record of 70



VII

Page.



Whistle 56

Winch, steam 46

Windlass, steam 46

Working-drawings • 70

" levers and gear 16

Workmanship and materials.. 67
Working platforms 16



Page.



Working-valves from deck^
gear for 63



Z.

Zinc, boiler-protectors 40



JOHpi S. PRELL

Civil & Mechanical Engineer,

FOR

TWO HORIZONTAL DIRECT-ACTING COMPOUND SCREW ENGINES

FOR A

VESSEL OF 3,730 TONS DISPLACEMENT.

Reference being had to the accompanying drawings forming part of
these specifications.



GENERAL DESCRIPTION.

The engines will be placed in separate water-tight compart-
ments, and will be duplicates; the low-pressure cylinder being
forward of the high-pressure in the forward, and abaft it in the
after compartment; the forward engine to turn the starboard
propeller.

Each engine will have a high and a low-pressure cylinder of
44 and 85 inches diameter respectively, and a stroke of piston
of 36 inches. The indicated horse-power to be about 7,503
under forced draught.

The high-pressure cylinders, covers, and bottoms are to be
steam-jacketed with steam of boiler-pressure. The valve-
chambers are to be cast on the cylinder-casings of both high-
pressure and low-pressure engines. The stop-valves and
throttles will be contained in separate castings, bolted to the
high-pressure cylinder-casings. The main steam-valves will
be of the piston type, two to each cylinder. The valve motion
is to be of the radial type, as shown in the drawings^ and
arranged to effect a good distribution of steam, without dis-
torting the exhaust, when cutting off" steam between the limits
of I stroke and such a point as shall give the maximum
power of the engines, as above specified, with steam in boilers
at 90 pounds pressure per square inch.
4086 2 (1)



Each piston will liave a sln<^le piston-rod, secured to a
cross-head moving on straight guides of rectangular section,
which will be bolted to the cylinder-casings at one end and
to the crank-shaft pillow-blocks at the other. The crank-
shafts are to be of steel, each in a single forging, with cranks
at right-angles. The castings forming the crank-shaft pil-
low-blocks will be cast in one piece for each engino. They
will be bolted to the engine-seatings, and stayed to the cylin-
ders by steel tie-rods.

The condensers will be cylindrical, placed athwartship as
shown, and will be made of sheet-brass, except the flanges,
tube-sheets, and nozzles, which will be of composition.

The tubes are to be of brass. Each condenser is to have a
cooling surface of not less than 6,750 square feet. The cir-
culating water will pass through one-half of the tubes and
return thron2:h the remainder; thence overboard throuo-h the
outboard-delivery valves.

The circulating-pumps, one for each condenser, will be of
the centrifugal type; each driven by its own engine direct, and
so arrano-ed as to be used for freeing; the b:lo;es in case of ne-
cessity.

The air-pumps, one for each condenser, will be hoiizontal;
each worked by an independent, two-crank, compound engine.
Each will deliver into a feed-tank in its engine-room.

There is to be a vertical double-cylinder feed-engine, with
two double-acting pumps, in each fire-room, to be used as
main feed-pumps. Their suction-pipes are to connect to feed-
tanks, hot-wells, and bottoms of condensers only. Pyach of
these pumps is to be arranged so as to be capable of feeding
each boiler or any boiler.

A double-cylinder auxiliary engine, same as main feed-
engines, with two double-acting pumps, is to be fitted in each
fire-room, with a set of feed-pipes, feed-valves, and overflow-
valves, separate and distinct from the pipes and apparatus
belonging to the main feed-pumps. These pumps are to be
fitted to draw water from the bottoms of the condensers, from
the feed-tanks, from the sea, and from bilges.



There are to be two bilge-pumps worked by each air-pump
engine, one drawing from the bilge valve-boxes and the other
from the bilge. The propellers are to be right and left, three-
bladed, of manganese-bronze, and of 14 feet diameter.

There are to be six main boilers, in two water-tight com-
partments, with athwartship fire-rooms; the boilers to be
placed in opposite directions with their uptakes all leading to
a common smoke-pipe. The boilers in the forward compart-
ment are to be 1 1 feet diameter, and those in the after com-
partment 11 feet 6 inches diameter. They are to have, col-
lectively, about 15,600 square feet of heating surface. The
boilers are each to have three furnaces, and horizontal fire-
tubes behind the furnaces leading from a combustion-cham-
ber common to the three furnaces to a common uptake at the
back end.

There will also be an auxiliary boiler, with 400 square feet
of heating surface, on the protective deck over the forward
main boilers.

There is to be one smoke-pipe, connecting with the uptakes
of all the boilers, to be about 60 feet high above the highest
grate-bars. The fire-rooms are to be arranged to work in
plenum^ air being driven into each fire-room by blowing-fans
of sufficient power to maintain an air pressure of not less
than 2 inches of water. The engines, main boilers, and
steam-pipes to be entirely below the protective deck.

There will be steam starting and reversing-gear, distilling
apparatus, auxiliary bilge and fire-pumps, ash-hoisting engines,
a windlass for handling the anchors and for other heavy work,
a steam wdnch for hoisting boats and other light work, steam
turning-gear for main engines, and such other auxiliary or
supplementary machinery, tools, instruments or apparatus as
may be described in the following detailed specifications or
shown in the official drawings.



DETAILED SPECIFICATIONS.

HIGH-PKESSUKE CYLINDER-CASINGS.

The high-pressure cylinder-casing of each main engine,
which will include the steam and exhaust ports and passages,
inboard head, valve-chests, and sole-plate, is to be made of best
cast-iron. It will be about 52| inches in outside diameter,
with walls 1 J inches thick, except at ends, where the thick-
ness is increased, as shown in drawings. The inboard head
will be If and 2 inches thick, will be ribbed on the outside, and
will have the piston-rod stuffing-box nozzle cast on. There
will be at the bottom a sole-plate 10 x 56| x If inches, well
ribbed to body of cylinder, feced on under side, and having
holes drilled for holding-down bolts. There will be, at in-
board end of the cylinder-casting a flange from top to bottom,
faced and drilled, for bolting to the low-pressure cylinder.
There will also be a flange extending all around the high-
pressure exhaust-nozzle, faced and drilled, for making the
steam connection between the two cylinders. There will be a
nozzle at lower part of head, with flange, for the relief- valve
and drain-cock. There will also be on outside of casting the
following facings, raised and ribbed where necessary, viz :

One for cylinder-cover ;

Four for valve-cliest bonnets ;

One for throttle- valve;

One for auxiliary exhaust to receiver ;

One for stuffing-box flange ;

One for cross-head slide ;

One for main tie-rod ;

One for diagonal tie- rod ;

Two for valve-motion rock-shaft brackets;

One for steam to jacket;

One for jacket drain ;

Two for valve- chest drains;



One for receiver-drain ;
Three for starting-lever brackets;
One for starting-valve chest ;
Two for indicator attachment.

The casing will be bored to receive the cylinder-lining, as
shown.

HIGH-PRESSURE CYLINDER-LININGS.

The working lining of each high-pressure cylinder will be
made of cast-iron, as hard as tools can work. It will be If
inches thick, turned and faced as shown. It is to be smoothly
and accurately bored, in place, to a diameter of 44 inches for
a length of 41 inches, and to a diameter of 44J inches for the
remainder of the outboard end. It is to be inserted in the
cylinder-casing in such a manner as to be steam-tight at both
ends and at outboard steam-ports. The outer end is to come
fair with the facing for cylinder-cover.

HIGH-PRESSURE CYLINDER-COVERS.

Each high-pressure cylinder-cover is to be made of best
cast-iron, with double shell, w^ll ribbed. It will be cored
to form a man-hole and bored and faced for a man-hole plate.
It is to be turned and faced to fit the cylinder-casing. It will
have a lug for lifting by, and faced bosses for jacket steam
and drain-pipes. The ribs are to have holes for the circula-
tion of steam and drain-holes for water. Walls of covers to
be 1 J inches thick. Each cover to be secured to its cylinder
by thirty-two IJ-inch wrought-iron studs, with finished
nuts.

HIGH-PRESSURE STEAM-JACKET.

The steam-jacket of each high-pressure cylinder will con-
sist of the s})ace between the cylinder-casing and cylinder-
lining; also of the hollow of cylinder-cover. Steam to be
taken from top or side of the main steam-pipe outside the
engine stop-valve with a pipe leading to each jacket-sp~ce.



6

A stop-valve to be in eacli branch of pip^^ Drain-pipes from
the lowest parts of each space an; to lead to an approved auto-
matic trap, thence by independent pipes and valves to the
feed-tank and bilo-e.



IIIGH-PRESS U RE VA L VE-CH ESTS.

Each high-pressure valve-chest will be fitted for two piston-
valves of 13 inches diameter. There will be an opening at
each end of each valve-seat for removing the valves and valve-
ch(st linings. Each opening will have a single-plate cast-iron
cover, as shown ; each with a bos3 for an oil-cup, and with
oil ])assages for lubricating the valve-stems. Each inboard
cover will have a stuffing-box, as sliown, with a grooved bear-
ing for supporting the weight of valve. Each outboard
cover will have a projecting cover for valve-stem, with a
grooved bearing, boss for oil-cup, and oil passages, same as
inboard cover. Each cover to be secured by ten |-inch studs
and nuts. The valve-chests will be accurately bored and
faced to receive the working linings.

HIGR-PPvES.SURE YALVE-CHEST LININGS.

There will be a working lining at each end of each high-
pressure valve, made of cast-iron as hard as tools can work.
Each lining will be turned and faced, and will be so inserted
in the bore of the valve-chest as to make all joints steam-tight.
The linings are to be kept in place by the valve-chest covers
as shown. They will each be smoothly and accurately bored,
in place, to a diameter of 13 inches.

HIGH-PRESSURE STEAM-PORTS.

The high-pressure steam-ports in valve-chest linings will
be 3| inches wide. Each will contain six diagonal bridges, of
dimensions as shown. The steam -passages leading to cylinders
to be made as shown, and smoothly cored.



HIGH-PRESSURE PISTON- VALVES.

Each high-pressure piston-valve is to be made of tough
cast-iron with followers of same. Each follower to be se-
cured by four f-inch wrought-iron bolts, with T-heads, and
with square composition nuts, locked as shown. The wearing
and packing-rings to be of cast-iron. The packing-rings to
be cut obliquely and tongued. All parts except the connect-
ing trunk to be turned, bored, and faced. The inboard end
of each valve to contain a wrought-iron ring, bored tapering,
for a bearing for the valve-stem.

HIGH-PRESSURE VALVE-STEMS.

Each high-pressure valve-stem will be of forged steel, 3J
inches diameter at stuffing-box. The inboard end will be
formed into a bearing for the valve link-pin ; fitted with
brasses, cap, bolts, lock-nuts, and keepers. The stem will
have a tapered bearing in the ring at inboard end of valve, and
will be secured at the other end by a cast-iron sleeve, screwed
on with left-handed thread. This sleeve is to be turned and
to slide in the bearing in outboard cover to take the weight
of the valve. The sleeve to be further secured by a round
nut with right-handed thread, and by a split-pin keeper. A
tool, as shown, to be furnished for screwing the sleeves on
the valve-stems.



LOW-PRESSURE CYLINDER-CASINGS.

The low-pressure cylinder-casing of each engine, which will
include the steam and exhaust-ports and passages, inboard-
head, valve-chest, and sole-plates, is to be made of best cast-
iron of sufficient hardness, consistent with strength, to form a
working cylinder, without lining. It will be smoothly and
accurately bored to an internal diameter of 85 inches for a
length of 41 inches, leaving the walls 1| inches thick; the re-
mainder of the outboard end being bored to an internal diame-
ter of 85| inches. The inboard head will be 1| and 2 inches



thick, will be ribbed on the outside^ and will have the piston-
rod stuffing-box nozzle cast on, as well as a nozzle at the bot-
tom for a 16-inch man-hole. There will be at the bottom of
cylinder-casing two sole-plates, each 10 x 56 J x If inches, well
ribbed to body of cylinder, faced on under sides, and having
holes drilled for holding-down bolts.

There will be flanges at inboard end and around the high-
pressure exhaust-passage to match those on the high-pressure
cylinder.

There will be on the outside of casing the following facings,
raised and ribbed whore necessary, viz :

One for cylinder-cover ;

Four for valve-chest covers;

One for main exhaust-pipe :

One for stuffintr-box flano-e ;

One for man-hole plate ;

One for cross-head slide;

Two for main tie-rods ;

One for diagonal tie-rod ;

Two for valve-motion rock-shaft brackets ;

One for cylinder of reversing-engine;

One for reversing-engine throttle-valve casing;

One for reversing-engine exhaust connection ;

One for receiver safety-valve ;

Two for indicator attachments;

Two for starting- valve pipes;

BOLTING CYLINDERS TOGETHER.

The high-})ressure and low-])ressure cylinders of each en-
gine are to ba bolted together by 1 J-inch body-bound wrought-
iron bolts and studs with finished nuts. When bolted together
the faces of all sole-plates must lie accurately in one plane ;
and the axes of the cylinders must be parallel with each other,
6 feet 9 inches apart, and must, at corresponding points, be
equidistant from sole-plate plane.



LOW-PRESSURE CYLINDER-COVERS.

The low-pressure cylinder-covers are to be similar in form,
material, and manufacture to those of the high-pressure cyl-
inders; but will have IJ-inch walls, and will not be steam-
jacketed. Each cover to be secured to its cylinder by 35
l|^-inch studs with finished nuts.

. LOW-PRESSURE VALVE-CHESTS.

Each low-pressure valve-chest will be fitted, in the same
manner as the high-pressure chests, for two 26-inch piston-
valves. Each valve-chest cover will have a boss for attaching
an oil-cup, but the oil connections with valve-stem sleeves
will be made by internal pipes instead of being drilled in the


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Online LibraryWilliam Hyslop FullerSpecifications for two horizontal direct-acting compound screw engines for U.S.S. Charleston, of 3,730 tons displacement, the engines, with their auxiliaries of 7,500 I.H.P. under forced draught; including boilers, screw propellers and all appendages and appurtenances complete, together with a list → online text (page 1 of 6)