Design of a dredger for Pearl River

, c-. 'dS OCT 18 1917

iS /R AR4

T H E S I S

DESIGY, OF A DREDGER FOR PEARL RIVER

Signature redacted

Signature redacted

Signature redacted

+t-s T 17 T 'l S9 7

Mfl'Librades

77 Massachusetts Avenue

Cambridge, MA 02139 http://Iibraries.mit.edu/ask

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Due to the condition of the original material, there are unavoidable flaws in this reproduction. We have made every effort possible to

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General Description of Pearl River

The Canton or Pearl River consists of a sort of

net-worY of ;aterways or channels. The largest of these

Saterrays or the main channel lies between Canton City

and. the T-ger Islan. Besides this, there are a

num-ber of smaller channels running in all directions from

Canton City to various places serving as a means of

transportation between the city and surrounding small

towns. The water in these chaznels is very shallow,

-enerally from four feet to five feet.

These chunnels not only have insufficient depth for transcportation purposes, but at certain Locations

the river bed gets so high that it acts as a dam and

4prevcnt easy flov of water; consequently disastrous

flooding occurs aLiost every year in the s)ring.

There are two main chaxels beten Canton City

and the outlet. The first one passing behind the Ko&-Ian Island to Tiger Island, and the other starts

Cirect-ly from the city front and joins the first one in the

vicinitv of \'haimpoa Island. This chainel is the

short-er route between Canton City and Tigshort-er Island, but on

ac-count of insufficient depth of water in this channel many .arge coastwise steamers are forced to c) by the

longer route.

The average dopth of water in the main chamel is

about 2,', but in certain localities it is only 18' or

less.

The current in the main chunel is only about three or four miles per hour end in the bmtnches only one mile or so per hour.

The nature of the beds varies in different locali-ties from fine sand to soft clay, but mostly Line sand.

Oving to the slender financial resources we propose

to build a dredger of small size for the purpose of

i-,roving the Pearl River and reclaiming the low lands.

To enaIe this dredger to work on the main ch1ermls as

well as on the branches, the draft necessarily beLst

szall, therefore four to five feet will be the limit.

There are no storms on the Pearl River and the water is catl all the year round, hence a low froeboard 'ill be

Choice of Type

The selection of the type an0 the size of a dredger

to be used on a job is of great importance. Tousands

of ..dollars may be wasted by errors made in this regard. There are three ijFportant cons.,erations :iven to the selection of a dredoer.

10 The character of the soil or material to be

0x-c avated.

20 The methods. to be used in the dis:osal of the 2aterial and. the distance frora the roint

of dred ging to the place of deposit.

30 The local conditions that -,.y surround the

i:orh,

that is, .?ether harbor or river ir9 :'ovwront , the traffic that ray inter-fore vith the dredger, uhether it is dre ging to recla1i land or to deopen

tho river. One ioportant point is the

depth of rater and the probable chance

of storr:as.

Before deciding the type for the desigi, it is nec-es;Eary to i:now the general adavtability of various types to different conditions and purposes.

The Suction or 2rl 0rLdge.

This type is better suited to 'ork in soil or &.a-terial. that is homogeneous, vhether soft or compact,

such as sand., gravel, clay, earth a alluvial de3OSit.

It is especially adapted to excavate hoQogeneous Late-rials in large quantities -Jich can be p2uiiamped through

lines when the pipe line is not over 3000 feet long. With greater length of pipe a large percentage of pOwr

is absorbed by friction in the pipes. This type is

ideal for -orcing at the site of dredging ;ere no rough

weather is erperienced

Buchet Dredge.

This type is good when the material is compact and

contains much large gravel or small boulders, or is

tough hardpan. V/hen scows or batrges are used it is

well adapted. It is not easily affected by tides and

currents; is economical, being able to excavate Lore

cubic yards per horse power than any other type.

DILT)r Dre.

T.e great advantage of this tyoc is economy in

labor. It is able to handle bouldc::s, stumps and other

obstructions on account of its great strenlgth and ower.

It needs, however, shilled and experienced operators to

iopper re

As c. rule dopper Iredges .re sea- oing vessels.

ycru vork without acior-ge in orinary

7eather

an-

.ass

slo2ly the area to be

dredged,

pic.1in6g up its load until the hoppers are 2Ll and procee ding to sea tu Dnrp itz load. This typo is not suited for

mate-:ial vhich does not settle or precipitate in the hopper. From this discussion It is evident that the

suc-tion type coplies

nith

most of the conditions

and

pur-poses as described 1r. the "General Description of the

Iearl

TSRiver".

Dence

it is concluded that the suction

Deterhination of 1rinc iplC Dimens i ons.

L de n d 7ater ine.

00

L = length onW~ei feet.

B

=btreadcth

extreme on Plating in VIJLQ in feet.

D

=uaught

of water on half length.

r diVSlacement to 0 in tons, L= freeboard in feet. Be = conter of buoyancy.

S=metacenter.

G=

center of

gravIty. bloc: coefficient.

= mid ship-section coefficient. N' = w:ater-line coeft'icient.

A = ---

=

vertical cylinder coefficient.

Y

- = o1toritrol cyllnder coefficient.

V = fraction obtained fron ; :iilar ships.

26 Lt. 1 -. .62 .67 .93 235 tins. M wo

G

0 Ass~m~e: 7 =-(3 = L.

Then for D = 4 OG = F - v(D+r) = 4 - ( 4+4) = 4 -. 1 X = 2.56

D

4.5

OG =4 - '1 X .5 = - 1: n2-421-2

D = 5

0G - 4 - .18

X

9

_{= 2.3g} Agaii for D =4 D 1 4 - (-

+x

) = (5 + -926) = X 1.426 3 2 7 = 1.90 B =4-4.5 0B0 -;- X 1.426 55 030 = X 1. 426 = 2.

14

= 2.38 Again for B = 4 B0L = GM + OG + 030

=

2.5 + 2.56 + 1.9 D = 4.5 0M = 2.5 + 2.42 + 2.14 2.5 + 2.38 + 2.3() ?inally for D = 4 D B₀ M/-926 X 4 X 6.96 .157 + -130 -157 + .130 X .67 .926 x 4 x 6.96

=2---. 244) = 6.96

= 7.06

- 7.26 = 20.8

.926 9 4-5 2 7.06 ---244 D 5 .926 2: 5 2: 7-26 244

=

22.2 =23.g

From

curve

we

:ound B (brea"dth) correspond ing to

D (drauht) of 4.5

feet

is 22 foet approxi tely.

35 W

35 c 235

=

135

.L :3.62 _ 22 4.5

ThereIore the prinCipa-l im1sionP are

D 'i-s J. w V

S22 ~t.

I

_ij

4

_-71-i

-- I

V

22

z'Iit-t

2I .

-F-Ell

-7 V T -77 K":; [I -~ T

NO1

77~~

--- A v-I

I-

_-I F i+

~77

fEY -- T 21;~ -4----K 1 7 +

H7jH,

'T r-7 DRjAUGHT IN FEET. q 22 ZI HOW Ont

/C

Dete rmlination of ScrantLings by Lloyd's Rules

Tranzsverse Number B + D = (22.17 + 8.5) = 30.67

Longitudinal furer = T(B + D) 35 X 30.67 = 4140-5

d 7 ft.

.35

D .

All scantlings 2ound accorfdinC to the above re-lations are indicated in midship-section drawings.

Delta E i lon

J.

Israel Cl) c) _{0( IIA'} 4-3' 0 4- 0 H C

4- ,'- C4 _{, G - i ) rj} 4 'AI _all~0 f-iC 4~

4--r- (DC)C) -1751 381 1-411 1050 1259 1.19 34ff 1000 161-l18' -- Sand "1571 40'1 7 14ft 748 1305 1. 74 32" 1000 16 1-1' f - Sa-nd 1601 42' 121-6"l 9 US0 2106 2.15 3-6"1 --- 2000 35' Soft Tarte _{c lay}

-n-

1

-9

---

6-" 38, 14'-6t" 1000 -- --- - " - ---- 38" sa-nd es;n 135' 22' 8 -6" 230 500

1.8

14"

4'-6"

1000 30' 1

sand.

Size of EnEgines.

FrOml te rezults of the Progressive Trial ol the "2ontocr" it is found that:

L..

mean

poressure = 95.0

R.P.Z. =114.

L.. " = 21.7

T.?.

RatiO of cylinder volumes ---- 4.

.P. ( J. P. nean pressure )

S

=

. P. mean

presure + ---p Ratio of L.P. to H.P. 95 = 21.7 + --- = 45.45

Assume

7iston

speed = 450

I.H.P. X 33000 Area of" L.P. =---R.P.M. X piston speed 280 X 33000 =---450 _{square inches.} 45. 45 X 450 Diameter of T .' 4

i

24" "F.

P

---- = 12" Assume R.TP.M. = 110 ristoi PTeeC. Stroae

=---450

---- = ' or _24" 2 110 /2

--I 4 *C C) C-4 P: P O rdC *~- 00 Orj-4C 0) 0C) 01 .-1~ *Hr)!4 C) 0 CT) - r-1 H P d + .) f *H H o ! 2~~2 N.; nso a ao od opC H -CPr,1 4-C -I ( I ;A - I 1-A d- + 4-3 a a * ~ ~ ~ ~ ~ -00 ~-) o -' ~ 0 d Pq ( E- t) EAWC 0 -hMC) 20" X 40"

Mohawk

400

Vertical --- 1 S.E. 62 1850

.155

4.63

4

Compound. 24" 181f X 33J Fortune 334 " 2 S.E. 67 1766 .200 5.28 3.52 24" 13" X 26" Roc-et

450

" --- 1 S.E. 40 1100 .089 2.45

4

18 - --- - ---181 X 36" 1 S.JE. 71 1716 .132 3.55 3.8 Tecumsei 540 " 24" 20 X

40"

PCoria 270 " -- d--- 1 S.E. 65 2040 _{.240 7.55 3.8} 27" ---12" X 24" 1 S.E. 45 1330

.i6o

4.75

4

De s ign 280 ---24"

/4

Size o0 3oilers (S.E.)

From table of dimnsions of boilers, tie following

is taien corresponding nearest to the designed heating

surface.

Diameter ...,... 13'- 0"

Length ...

10'-

6"

Furnmace diameter ... 46"I

nober

of

furnace ...

3

Total heating surface ... 1335 s-ft.

Weight of boiler V7ith water .... 32

Working pressure ... 180 lb.

11hu'ober of conbustion chamabers .. 3

Mumrber

of

tubes ...

176

Diameter of

tube

s ... _{3- 1/2}

i-CALCULATION

OF POWER BY TAYLOR'S

STANDARD

5ERIE5

NAME OF SMIP DE5IGNED SPEED - NoTs DATE

DiMEN Si0N5. FOizMULA !.

LEmrTH ON L.W.L L= /E T. 5 = C19

BEAM_ B - 42 FT. E.H.P z -0050-S 5 V

DRAFT ' 4 -%'f FT E.H-P - *o- D x xv

DI5PLAEMENT -D 2 3F T .5.W CONTA0NT5 WE SURFACE - - 2- An Q.FT.

VC //-9 z7-5 L

COEFf IC ENT5.

BLOCK COEF.

b

4z

LONqITUDINAL COEF

t

' - 7

o

o7F

MID5MiEP5ECTIOM COE . 'Vly*.__?___ LIO

WETTED 5URFACE COtEF [Fi.4l} C = ____ __--25

FIZCTiONAL COE.F TABLE f - / - 1-50 -7

1) (t) 3) (4) (5) (6) (7) '(s) (9) (10) (11) (11) (li (W)

M-

MuLT.By PROPUL

t y DIFE

I-Zt5

gD

.By V V .H.P E.).P E.H.P I.P

$=7y75~~ 1--5U -'3-1 _{vT 5TAum Clh(8)}

_ _0_ 61

- .* g -$1 'f7 -. t2 /-iA -.rLi Z-7 .2I7 Z-o 2-4f /f7-o /6?-ZO 4SY- .,

-65 /.o .76 -3 -Zs- /-?44 -,4 ?o 7-JS j 0Z-o jJ-4 /94-o /? / eJ3-0 -S

70 /.70 o3 -+o -304- 2-00- 4/4o 1-/+ ,T.-f 4-flN 24 2J0-3( 4Z-o -4 -75 1-10 2-+4 -40 -*Io+ + /al- *fo 7'.72 A47-o f-3;oo 44-9 Jos- o -060 0 4

.86 95 1-05 100 ___ ___ __ _ vo5 1-10 Ilzo I-Z5 125 1-50

F SPEED /ND POWE CUPRVE By Tqri-oR's A'1ErtioOD 42

-4-L

1$4 -Ah

T7t

o

47-4-7

oPE I NT

speed

72/3

,3

Auairalty Coelficiant C

=

3 Sr e e d V =

1.

r 71, c ( wr)2/3 280 X 75 (230)2/3 = .i t1Ots. or " J7

1"

Ir-nf

rnat

ion regarding weight

statn-M3nts

of

d~roces are not obtainable. However, the

ercentage

weight of the

hull proper from

the plans of

the

"Co.-stock"

was

calculated

and

used as

a

guide

for the

de-sign. Percentage weight of other items is

obtain-ed by zommap arison with those of some existing

freight-ers of similar

size.

The calculated

weights

of

the va:ious

parts of

the hull nroper of the "Constocl"

BulJhIead

---Transverse Framing ... =

Shell

Plating

...--Decks . . . =

Stem and Stern Post ..

-Longitudinal Framing.. =

Inner BottoI Plating.. =

ACdi 2 1 rivet head Total

are as follows:

54.0

tons.

33.0

35.0

42. 0 3.0 67.0 I I if f I 20.0 " 30.0 tons. 6.0 310.0 tons.

Dis-lacement of "ComstoCi" = 1050 tons.

Percentage weight of hul 1 proper = ---

0

=

30

1~eiaiaywraigh!,t S4ta, rnt. Porcentage. 1 Hu .l1 coiplote 2.Trail fittings * a 999 999599 3. Steam encineering including pumps

4.

:qEuipmL.ent

and Stores ...

5. Output and Stores

6. F)iel (c o l ...-.. . . 1

7. M r i . . . .

Eol tion of Itxs. Hll complete

-TIUll fittings

-in.clud&s hull steel min uood,

hull ror: for machinery and joiner ;orI.

appliances for steering,

pumping, anchor handling, boat

handling and :iscellaneous fit-tings.

Stern Einiee ring - all machinery including

;ater in boiler, 'aiping,

tools and SPARES

Equipment and Stores - Power generating Tlant,

ieamn f coummjunication, ground.

tacl+e, etc., and

laiscella-nIou 0 (iupment.

44.

0

2.0 34.0 0.5 1.5 15.0 . 0 Tons. 101.20 18. 20 1.15

3.45

34.50 6.90 230.0 100.0

Out-it and Stores - boats, furiture, _and

crews with efrects. J- 1 - coal, (no

rmal

surpply

).

R A/VSVE F S E fRAMIN. C

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CALCULATiON OF ETi

MMTEIRLC.G A18OVE Lom&ITUD1?4AL CG. 'FROM~ ~

OE9CRIPTION EIIH BA E , I N FRAME

cg DI?'E NSIONG . YER-ricAL4 C.TFORW 1 C. C. A EF

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7

ii

----IOur5WORK ,j/9,711vl~ 3/5?;o 237' 9.0,0 a2' d a o

7-JL //A0 /&6 141/" /42 R S

-~~~~ ~ J -4---- _ _ _

'A -- -- - ---- T--___

----

DETRIL5 OF CALCULATION OF WEIGHTS

~ WT~iLC.GI8V A1oL omErITUDI4AL C-G-FROM Q

DE9CRIPTIOr' NC~NEF$M 4

IaN D~ E NSIONS C. G- VIRTIC . Cr. F FR V103R 0 C. O. AFrEF'

i'l~oE rT f:fWRrj, M~/ON1 E NTS A F T MOMENTS

X q INF F T- i qk4 FT.1 k r r T TO 1 IP4 IT FiTcN';

13 vl --4 AD 7 /Q 6 LO o /0

/+ FAINTS &C ,T5 /o o 1o o /.o /-00

0DETA

IL.5

Z MAITERIAL

CL 0E9CRiPTl0N

TO- W IN- -CE

/9* Y~Dx~&A,,Cr_

f7I , J AC /VAS

7C--~-OF

CA~LCULATION OF

WEIGHTS

7C.G ABOEo Lom&,TuDmA4L C.G. FROMIQ~

BASE lrNEI F:RFArE N2

jC. Gr EZTCAL C. G-. FcORWPFR C C. LG.AFEP

F MOR ~MEmrIS AFT MOMEN-S

0-76 7-00 -4-?' 335-0, .14-c'.fo0 .4 <23 .J- Z'7- 000c 4-~~.0 --- -s-- -ufo ~a~'~Za-Zoo c) 6,7 6-c 37.z o 7o lj

3-fS36----n

K

-1423 d -s 7o 31- - --- 1 ~

1

___C TuEA7-T/Acr o /-of //'0 ,70 Wc

23 _____ L_ _ Ave 0_ __ US__ ___7i*l~ ____ 0 6'

---

A - I - -

-4-43 7-33 JP--4q4 S- o

__ I __

DETPIL5

OF

CAILCULATION OF YVElroHT.S

I I BASEI-114 FRAM-E N!

0 INIESIONS C. 7rjci O~E~EN~~RkD,~/OM~Eh~rS TCAcr. FORMAR C. AFT G. !MOMEN- If I

WE4~ifWiryi iA/AT -_

- s& f_ --

7-C.3-ao J' 77i

DET I LS

OF

CA~LCULATION OF WEIGTHTS

M~iTERIALc.G 'ABOVI LoNGITuD?1~4L C-G. FROrvl

I BAE L114 FRAME

0:) IN DriE N IONG .G 'ERTICAL C.&FORWP5 F .C. fr l

ce IANE!Mmfp~ Fl^R4rj MOM~EN7.5 A~FT MOMENTS

' P~ r. PFr-V~i. ti- FT. tr VT-O"Sj Iw T, itA

FT-TcN'-V'

5

_{I V 1-e'~i} fEVC 9 AT1rCr PZA AT 02 0o ~

-. o

7,?oVA o J r/ 1v Lf Cfr a3 J50 54-6l

U-ZAf C4l A /,-- -5rc-- Ioo -&--l /-1o /0/7-<-o

30 Ecv'qx /SO4S /o +04o /o 7-00

Kr

__ __

v-I-.----

- _________

1-

4-_____________ -

V

F-I

---- vi

~1

___________ _ _* 1 I __

I

__ __

I

-~

1

____________ I I -K

I

____

t

________ I -~_-~ I ______ _________

-I

--- --7ToFA L 534 jq7 lo*6 7 7823

DETAILS

OlF

CALCULATON OF VWEI&HTS

M~ERLC.G A13(ovE6 LomGITuDmA PL C-G. ForOvi ,

I BR E 1-11E FRA~ME W!

0- E9CRIPTION !WEJ6+HT .

---o N EJIN SIC)NS C VET:CALC -- FORWAR (' c.c. AfrEr

,Br rF ;R wRD' MAMENr5l AF-r MOMEN-T

4 t4' P 0!LllFT rT-r-rsl im FT t FTIN

-3/ ZA D/E 0-lcc 7-oo *7oo 1-5-oo /--fco

3 3 rw 6

0oE~'~ -73c 1I1-3 2-160 6cc00 -1 -1 e

1.c -/3-3o Jif-oo 7Z 0 3~SuPPLYAS S-oqE.S

0"- ALL AAD

3-gaoo -1fa 17-/C /0-0o0 go

---I --- i. ~.- _________ ]

I

i--i

~

r

~-~--- - 4..--~ -- ,---~--- --~

F-____ __ ____

I

__ ____ ___ --- ~-~--# 4 -1

--1

-~

1--I

t

-K-

--- ___ I II - ~_______ _II,, ________

1~~~_______

-~ - +--- _ _

*1

_ -~ -- il - ~ 67ZC z-.. ~jj~ 37-33 __-- IOrALS ~ J06 '~'~

L___

DETAIL5 OF CALCULATION OF

VVEL

T

HTS

C. G. ASoVE LONGITUDIHAL C.G FROM Q1

z MATER IAL ..

BAGE LiNE PFRAME N2

OESCRIPTION

-fi1-T

[ i E IErION C.cG. VEFTCI C. Cr. FORWARD I

SOV CMNT FOWN10OMEN-51 A FT MOMEN TS

Ite Ft FT-T , FTr FP r L TT-Tm T-T UO'E L COL- /3W8o /o j

--4

4.- --To r ---V----~~-~ I-__________ ___________ 1. _________ ~

I.

________ ________ _______ __________ ________________ J

~1-7

--- ~--- i- F----I __ ____ __ --- 4-~- -~ -A- ---- ~

BLETRIL5 DIP CALCULATION

OF

rYEIHS

-M~iTRUALC. G ABOVE ILom&ITUDII4AL C.G. FROM 3~

CIE3CRiPTION --

I

RAE T4

DIM-ENSIONS C.& YrERTICL.IIRPO .. ArF

(Y t8Ei MCf MT!FI-WRr~lv> toM hTS A T MOMENTS I/LI ~ ~jt- 7~-E

Z~ //ULLA7/ti 4-43 17TY2 F 4 6-J ,J4-3.Zl

3 J/*'i _ '>~/v~j~7%9~&23 A-~o - - F/lo -f o

4-7.2 1z'7-,-4--J

I-/, /'j'ci s4 - /tA0

c. gr-L~ OA o33 -.

7 fqR~I/ 3.,JZ~~ 7~/07 ___________

D(S&AO4~A1A~VP - 23-3 1 -~I2-S __ .~

kj-ie17 7o____fE T ) ,1' ~ :',0' &V

K

7,qLNAi~ii7 TRIM, _____

-s--~--DETAILED WEIGHT CALCULATION FOR

MAiN

DECK

STATDNg LENOTH OF WEIGHT OF WEIGHT OF WEIGHT OF TOTAL. C. G VEITICAL

NUMBER DECK BEuIm DECK BEAm .)EcK PLmTw PLRNKIN,& WE IO3HT /\SOVESAYE MOMENT

IN FZET IN TONs IN TON IN TON IN ToN IN FEET IN FOOT-TONS

I i 5- -o687 -*OO533 j-aqqc - -8

h

1 If>-f>

-0311 -j

1l~J0-igog

,

61

-|3

5

3 U-Z4- ,o3? '37 1- - 0070 -19~

--4 4--69 -o44-o6 -ot o 7-(O- -20

5 ;2- 0 -04 1 -Z

'!74-

.olo'7 -2613 _ 4-0

6

-

03 7 - 19 0 10 cg .12 .-72- - 69

7 1 - -034-1 -I-2-27 .o o -6S-6

9.76-

'

460

1

14-4-

02o61

-o171

o

0oS70 1310 c -7-- I 5-o

9

1

-7

. 0 2-t 7 / 0 0 -70 C o - o I ~)

-7

7

'9 3

0

-

I

DETAILED WEIGHT CALCULATION FOR

SHELL

PLATING

LEN6TH OF WEIGHT PEF?

HALF GIRTH FOOT RuN CORRECTIONS

WEIGtr OF #

GIRTH PER FT

N FEET APi POUNDS Se a CoR RECtEL D So- I i2-4 14-- 7 /64- 6 2 o2-0 ' ' 1.000

6

-

2-73-9

-9

2J-1 -OO0 9-2

9

L-oo I 64-6 '274- I

VVi& GiT CF C. G. VERTIC L-WIHOLE GIRTH / 5OVE BASE MOMENT

N ToNG I MF EET IN FOOT-TONS

14- 3- E0 70

189

3

3o

-

70

2.3,2o

4 -I 4-P -4 40

17.6

7.7

1-000

7.7

.%

S7

-7.

4. 7

&'- CL3

t6

66

9-

I1

F8

9 -003

RS-6

-10

-6o

*6i%

'?

Q-7

S6 8 \oo 3- *Leo - 26 -'73.6 ST.ATIoN eN" ~

TABLE FOR BONJEAN'S CURVES

UP TO WATER LINE N2I WATER LINE N2 WATER LINE N?3 VNATER INE No4- \NATER LINE AVO 6 \ATER LINE N0 6

SrATr'r4 .qT-aR AREA OF m - Of NTE(RATOR 4REA o>P .NTEGRAToFr AEA oP INTE6RAT? A17A OF iNTEGRATOX PqEA OF

EDMING9 . !F , I N oao im -0EMOANOS SECTION IN qE4D#NfsS 'ECT o'4 IV 0 CT 0 REDIN&S SEcTiON jIJ

I',_____S. Fe, ~ -~~l~ s - r-,_&_"

F. P.

~L

02' 3-b2 -a 9 2- 100 I 6-0 15o 2.4-0 154 2-6 . -(1 A9._9

- 0& - -12 2> (1.71 .%00 32-0 - 6 4!-7 . _{13o 4(0-4} . _{4-17 74}

o?+ - -5 3 44-64 -3S32 62-'g 93 8 81-1 -*659 110 -3 -832 133.2.

3 -141 2 3 -. - 3D4-

So-0

-486 77.e -659 toS-6 -'44 134- 6 .is' i 64.o

+ 17'1 27-82 -37O 59-20 -57o 9 1-3 -779 t'+-7 -980 1,4-1- 7 1-163 i 81-2

-189 -2ci- ct - 3B'- 61-16 -6 )3 9E- o -803 1-8- .00 3 6 -6 (-ISO I o -o

7

8

S - 34 2t. 4 4₁i4t -370 21.20 .493 I -J. +~ 106- 2.. .87o 132-v l* o2~ I t I + 4 F I I I _____________ I ___________ .0 53 - 03 -001 A. p 2-07 o.64 -1 _{2. 21-11 .3}

₀

4-a.-.032 ;-o

~1

.0(o04 62-o -\33 . -2 - .iS-118 .c) 63.23 -i51-I 04 .oil 10o

16-0

1-1 ;

I

A--f.o '2- 72 I 0--L 91.-134.1 132--o 1-02.3 I 53 -0

iN

Constr:ction of Weight and Buoyancy Curve

Let v

=

required vertic.l scale for weight curve.

"~ I = If horizontal 11

" iW = displacOment of ship in tons.

I

A =

80

constant of the integra-h

o29loyed.

Then V

=

A X V X h.

Taliing horizontal scale 1,i8" 1 foot 230

v

---

.36

80 X 8

n'ahing so1e allouance 're rake v l/ 4" = 1/10 ton.

Tio determine the distriution o hull eight .

h'E

C 0

Let W7 'I oi :sull.

L = Lrth of 0hip.

x = distance in feet of center of gravity of L

hull fon'-ard Of

15 X 101.6

14 X 135

= .81 ton per ft. ran.

AB--- +

6

6x C2D -- - X 135 = --- + 6 X 3

=

22.5 + 18 = 40-5

6

13 --- - 6

X 3

= 22.5 - 18

4-5

6

.6 h' = .6 X .81 = .486 ton

er

ft.

:vn.

Wie assume the weights of margin, Uiscellaneous

etc., to be distriluted in the same maner as the hull

eight. Of course the other items of weights are

to be so distributed their weights and their center of

gravity Will agree.

Calculation of Rudd.r Stocie

Let A = area of ruader.

v

=

speed in }rnots.

T = twisting moment in ft.lb.

D = diameter of rudder stoci.

Then T= 2.43 A V2 b sin 350

2.43 X 7 X (8)2 X 1.8 X .5 736 1120

T

T2Akng 2 = 7500 1-. per square inch

3 1120 X 12

D

=

5.1

---7500

a 3" solid wrought iron.

15 NI 14 L

Dote ra'ination of

Weig;ht of Anchor

Assuniing weight of a 'bower to be one pound for every ton of ship ve get weight for a bower equal to

230 pounds.

Take two bovers of weight 250 pounds each and one sheet anchor of light weight for our dzesign.

Since vie have no drawing of such size of anchors, at han, the best we can do is to take a drawing of certain anchors of the saxe type and obtain the

dimen-0ions of the anchors Zor our design by assuming the (Linear dimensions)

TABLE FOR CROSS CURVE AT ANGLE

OF

INCLIN

A'T1

15 0

WATERPLANE N9 I WAT ER PIANE ~N9Z

SHEET 1. LANE N MOM E NT I 3 A 4 0 4 8 4 (C; 6 64 -1 66 -7 A-7 64 6 . 4-* 3 MOM E-4T .-.- L . 2.30 3.014-po .44Z - ) i*7 /4.4.9 6 -6 -- oob +. -. 3,28 +.53 + 53A--V .. ooq -o og -'036 +. 6'6 41-980 -646 4. - 4 e .. Il k -. 409 0 G30 1- 029 1 16-7 I.14 6 .2 3 ARE.A . 0 46 S3 56 4- 5 4-51-! Z '2-174 +0 05, + - Q9 . 4.6 4 . 01 7 5 -.. Ir ~1CA-1~NT J31 4. 3c0 14-2 +2.04+ +1- 124+ * 016 7 16 . 0 7 13 70a 1. 37o -d27 .Q$9 ARP E A 074 3.2-1 L 6- 2 3 1-74o 4-'l I-o

-178

32- 2 . - -+ -012 + -6- Y7 -7 3 +-A74 3 -274 I 4.z -- .Z73! 7 -14- 1 -- . 7~ 2-472

-

0

T\BLE FOR CROSS CURVE AT At WATERPLANE N9 I AR E A WAT E R K 0 3 4 t 8 I (C-2-43 - 4 I . Ito -44c-;L .*lg - 2.19 2. 1 2-9 1.490 3-364-1- 744-.4 2 2 -760 - Is I -Cic MOME NT NT -- c036 -- o12 . 1* 7 02$ +- 41 - 6/+4 + -55' AT 104-4 -83 +3- 4 . +/84 ₊ 3 -3 * -37o + -74o

+-23

+4-0O2 - -OO

.

- .003 i.0Q50 A Q10

GLE

OF

INCLIN ATIO,

30,

1r E ET N

PI ANE~N9Z Wi% PL ANE -4

M0M NT AREA ? T 24 -03 - 06 - 4 461 + -1 3 e c 6 3 j - 4 *'L -4.4-8 + 36. +- 6 6a o. 2 6 ?40 , 7 3.3 +-49 + I- 6A. 3 2-6- 2, 4-o + 3- 3 4 4 -+ 1 + - 4-9 . & 1.136 +' ~ 6 -+2 0 .4. -38 +-3 + -1 6 . 9 7Z 4 . . + -l o 34 . 0 05 - - 0 -2 'C)-- 00 a o - 2-t' Sbj 1-0716 1.064

- /qz

' 92 -4 .6 4-1 4-2. -1 12139 2 .412.

TABLE

FOR CROSS CURVE AT ANGLE

OF

INCLINATIO

AS-a WATERPLANE Ne I A %; '-, P E A e7 3 4

I-K

7

4 4 6 - o -7 1-4 I?7 L. .cL MOFM E NT 191+ z-6 \. 68 ~ .> 49% 0 0 6 6 6 o41-o 6 007 -+ 343 - 4-t 4 + .~ I $ +' *3 +. 2-:) WAT ER Pt ANE - N9Z AR EA .0 2 34 + -1 69 + . 63 S-07 . 013 6 - r3-l 64 f- 02?) 3591 - u-Z. 3.

4'46ff

zj-4.SZ 2* o+6 2.' 72 4-3 2, -1b4 + o7 4,744 + -j33 +*- 0 43L 3 o SriEET NS A t- A .ANE N 4T AREA 1'~ 4 -t - 4- .3 - ? -oil -f 4-3 - / -3- .F?7 27 H 73Z )'35/ S--4- 4-10 6 )- 4-79 2.- S *+3Z /.2-+ 24o---a4 -/ -* .7g g 2 { i% o/9 ~1

I

+071 4 -+-13i~ +

,.

U

,70

-4 - 7 43 + -70 ej , .16 + I. / '-ip ,6 5-.7 76 -34? -z 40 * 25

TABLE FOR CROSS CURVE AT ANGLE OF INCLINPOTl

WATER PLANE N91 WATER Pt ANE ~ N

,l (D M EN T "I C,,

K

K

II I- A-:5 V 8

H

I--7 - 01 .42.3 _v0s3 2.276 36 *0 ? -*v. 1 *.lO -. O3O AR SA w, II " +4 194 - 2-54 -v i-38 ,Q-380 S-9 6/+ -l 3 1 +-.4. ~ . . .2 t-i 0fM F 1-00z -00~ 2-9loo +-t 4 3-0A20 ,- 1 0 -34 4-o 4."4 +- ~ii 3.Q2 o +-0 .o) - . l + SEEET N' 4-RPLANE N1 T A R E A

7

064 -37 A oz 2 64 zA. -0o34 of -47 -343 hsas :.44c /-3

B

-2.6/ _{. 32 -X +}-5E33 7*4 -5-.460 5-33.7 2. '2. -t *o4 / -4. -t 4 -I. 4 4 o 0 .42.6 -337 -206 .o3r 5 10 7 2. S- 5 8:2 40-357 .11 Z 67 1V2 .13

(6

os 40 +/3 00 + -30 . 07 +T B7 i

TABLE FOR CROSS CURVE AT ANGLE

or

INCLINAT10

WAl ER PLANE Ne I WAT E R Pt NE N9Z

7~O

SHEET W 3'

PLANE N, 3

) M eME NT ARE A

9uN os 'q-TIOW lN FUN

K>

3 7 -07

3

- 6 5'1 ~. 004. .24-1 .c,77 *IONS Is ~ 1., 3I6

1

MOMENIT_ ' Ufnrl0k READ CT IJ1\ . . 6 1.21 0-7. 07 + -355' + -o74 - )04--710 '1.242 - 67 8 -42.

1+.

c',

0 o$ 'S' o o 35-' .027.4 . 014 0.- 6 A E A -017 .195 .3 ol .3"6 -00 - I7 7 0A . 4-

3

- 736 .6100 -LAZO .4 6 0 V'32 '.3

-

3.

AEA MoET S'l ~ lNG': UNCTiON ' . +2. 036 ++o70 41 - 9 1 0 - 76 & . 1 07 o - 'g + -I83 .-

7

31 0 -4 1 -V -. 92 + .0 ,D 6 63o4- + -333 +(34. 2.1 704- + - 3 4 + S 5.1 2 ., -2 ,I7 + se 2:> 3 -391 4 -241 +-419 08

3'

63 + -2, z 5 -9124 3-

*6o

+-77. +_{2 6} o 03 -*6c6 +*- '+o + 17/4-'t

TABLE FOR CROSS CURVE AT ANGLE or INCLINoATIO&

9o

WATERPLANE Ne I WATER Pt ANE N9f

W-MoEr1 E NT .

-tn

9k

-26 o -966 t- o 07 00765 00LS -7 3o 3-84-0 014-37,0 ~236Z -1,7 +-.017 - . - -.1er + oz AR E A 016 -+ t. , * 47 MOMENT A T10,i~ %N SHEET V, ANE Nt4 6 -25- - 3g 5 b674 L- o .23o 3.3Z o L-033 0o66 1-115 2-3S0

-99j3

t'IM

.3);

- 66 +-. 4#17 417 -- 172.1 +- o4 k0(4-- -L>9 ... .l s +-

K

_i .

4--*3

0, -067 34 *- 2( 1.4-64 1-5 10 l's5 1

,

4

if

1- 73? 4- 6 $-.7 iLE

q.,2.56

4 07~c -. 003 + A-? + (3

2'77

*0 -36 080 . 16 -Li-4-33& 6 -- S~67 - - / -9 1c 4-1

STABILITY ORLOULATION

RE-ULTS: FROMn CROS9 CURVE COqLMAL~TION

-AN2 2 1- i*'36 61 ~~,,,d xX3 i-C, G' -3 17fl (4-N x9-x2 3o. Al 2L - 0 A 30 xN₁.2)( x!Z7= A -Z x 4W$xi- d j 3, &N3 13- 5-

x

z=

-7 1. L 3 ____CA 2- 07-S CT 3 ~~~~~, o x2.~~I7 A L = 4 z . Cr N37-77 90~ 2x'~ 07 X4X o 7T A - -o2x 4 T25I4-o fX2X2z~ts-7F* 'Alo ~ ,2 u Y-4- xL 3 47 O

--

I

I -4 300 , _2i6i7 C-; -U ~I27 K -Z-~ -~ - -4-0 I S-- } 4 2oo 250 300 35o DISPLACEMENTI IN TONE i-f CfOSS CURVES OF NG' 1 -ERE G t c, ~AKN ri /v2 3 \v.

L-ienr. -Descri-pticn -f tho

esign-The general form and arrangrement ;ill _{be seen in}

Fig5. 1, Z, 3. The hull is of steel and is 135 ft. long,

22 ft. eoeazi and

U

ft. 6 ins. deep. The outside plat-ing is generally 13-1/2" with a 3-inch yelloT pine dec2: laid on top of 12 1b. plating.

There is a side opening through which the

suc-tion tire woris. The suction

ripe

is of circular

orn with a diameter of 18 ins. It is suspended

from a pair of derrichs and operated by hand.

The dredger is +e0igned to woric 7

a e2th of 30

feTt. Te S11ction pipC JCrms a I -Dr -t de t

hull and both the hull and the attac4.ent of the ppe

thereto are of great strength to withstand the stress

due to contact with the bottom in a seaway.

The main engine i-s of vertical double exp2nsion

type, developing 280 I.1.1. and havi.g cylinders 12

inches and 24 inches in diameter ;:ith a 2)-inch strole.

It is adapjted to run 110 revolutions per >inute.

The engine room is 2rovided with all necessary acces-sories such as feed pump, 1urface condenser, etc. Steam is furnished by a single end Scotch boiler 13

s3

heating surface of 1335 square feet, and adapted for a

worzing pressure of 180 p.ounds There is coal

sun-12cr capacity for 34.5 tons.

The main pump is of the centrifugal type, having

cast steel runner of enclosed. type =d. heavy cast iron

shell. The bladmes of the an vrer 1 the heads of

the pum; are protected by steel -earink plate in the

shell. This shell is exceedingly heavy, so that it

can stand a considerable amount of T.rear before it

be-gins to fall. Both the propeller and the

centrifu-gal pump are driven by the main engine .hich is gear-ed to the pump.

The &redged material is to be discharged through

a ser s f discharging pipes ith flexible

connec-tions. _{These pipes are 14 inches in di-axeter and}

:ihen coupled up forai a line 1000 feet long.

The 7Thole of the operations of the dredger are

controlled fro- the pilot house on the main dcl; a

system: of bells and signals is bitted 'etween the

ilot house and the engine roor. The ilot house

is so -laced that the ooerator vill have an

unobstrct-Cd vie7 uip Fnd "o-Yn the river, also of the entire

dis-charoing lipe. The drainage system is provided

ith to hand pums through -ies discharging

54

is provided.

1. Electric Gonerator.

2. 2 Electric Motors for windlass.

3. 2 Hand Paips for drainage system. 4. 1 Feed Water PL.LTp.

5. 1 Condenser.

Conmmodious quarters for the master, engineer and

crew are provided in house on the main deck and

for-ward of the hold. There is a corplete electric

in-stallation, so that the dredger can worn night and day. It may not be out of place to mention here that Professor Henry H. W. Keith of the Massachusetts

Insti-tute of Technology, has given assistance and Taade

sug-gestions during the process of the design, and the

fol-lowing list of published literature has been

consult-ed:

1. "Pelian" (suction, clay cut ting ) M.E. May, 1910, p. 202.

2.5"Jingaf (suction, clay cuttiug) I.E.

May, 1910, p. 203.

3."!alu (suction, clay cutting) M.R. AMy, 1910, p. 203.

4. Gold (Buclret) M. E.

ay, 1910, p. 204-206

5. crewe (BucIet) M.E.

6. 20" ?ydraulic M.E.

Lay, 1911, p. 176.

7. Clay cutting suction' a. .

May, _1911, p. 177.

8. Clay cutting hydr:ulic M.E.

May, 1911, p. 178.

9. 'H I to Tlaru .E.

2lay, 1911, p. 181.

10. St. Lav.-rence (Suction

hopper)

M.E.

May, 1911, p. 181.

11. Mydraulic 9ipe line M.E.

Mry, 1911, p. 183.

12. GraT Crane hopper U.E1.

Lay, 1911, p. 185.

13. Adelaide (seagoing ucet) M.E.

Lay, 1911, 7. 135.

74.

:si: :o (tuciet and. suction) U.E.

Z-ay, 1911, p. 126.

15. General lctric (auciot) .

May, 1911, p. 327. 16 aEcyrus -10. ( ndrui )1 c .E

May, 1911, p. 329.

17. ShI-1ld "i"ll..

Tune, 1909, p. 126.

18. ITo. 1 and La Platt (cucLt) z.1 .

ul 1909, p. 277.

19. Chester (Yipper) M.E.

Aug. 1909, P. 299.

20. ToLe d (Diyer) 7.E.

Lay, 1910,

o.

179.

21. Pharaon (seagoing suction) :.E.

May, 1910, p. 13.

22. Gol Drege .E.

23. Andre Reboncas (Buchet) M.E. ay, 1910, o. 186.

24. Galveston (seagoing suction) M.E.

May, 1910, p. 136. 25. Mtor Dredge M.. ay, 1910, p. 188. 26. Gold. Drede L .. May, 1910, p. 189. 27. La P1ata M.E. May, 1910,.p. 190. 28. Braila M.E. May, 1910, p. 192.

29. Dipper Dredge 2.E.

May, 1910, p. 193.

30. 2Buci/t -ro"gc M.".

May, 1910, p. 197.

31. r2oc Liting Dre-4ge -. 31.

May, 1910, p. 200.

-2. 'lectric Suction M.E.

May, 1910, p. 201.

33. U.S.D. Galveston L.R.

April, 1909.

34. Bates Electric Tycraulic 1 .c . May, 1909, p.161.

35. Tliese (BuCket) M.J.

May, 1909, p. 164.

36. Cuban Gort (Diprer) i.E.

May, 1909, p. 164.

37. Eiialaya Mountains L.E.

Iry, 1909, p. 169.

38. Leviathan (suction) I.:.A.

April, 1909.

40. Xingston J.E.

Tay, 1909, _1.

41. Aloxandra ( suc tion ) 2. E.

CIO, 99, i3 19.

42. Sir iiarry Bullard (hopper) o .E. May, 1909, p. 190.

43. T. VII 'rulhling 1.E.

May,

1909, P. 193.

44. Seago~ig Suction Dredger by

T.1. Costoch, II.A. and M.E , 190.

45. DesJin o- Hull for i.ydraulIC Cuttor Dr6ed gir,

by %. . Percy, M .E. iay, 1909, p.162. 46. :oo urz Dredges. Ger.ian Trais. 1914, p.2J6. 47. 1.0.P. 209 0 (suction) 1..

lay, 111 p. 1"9 48. ITOU Orleans (hopper ) . E.

ay , 1911, p. 192.

49. U:.mguay (Ouczet suctio) ..

May, 1911, . 194.

50. V.

1.

Edgr (sand- ,.L) shipi.g LOC /r ,

April 30, 1914, 5p. 40.

51. Design of Difrerent TyCe o Dre 0es

1910, p. 179.

If

52. Dredges and Dredginlg" by Prelini.