The Jersey City news., 1898-07-30

masonry Or earth erabankments. as may
Re best suited to- the different locaiatles;; e J;
strength Of the best adapted shape, ana
built IN the most substantial and thorough a
With the necessary efTluent pipes, gate
houses, with gate-chambers and vaults,
gates, valves, screens, and all other ap Ie
pliances and appurtenances proper Tor the
purpose intended, with the necessary
i slope walls, by-wash, waste -Weirss ploW-
offs, drains and waste pipes and ., they
/ shall be provided with such suinclen55 !
space or area of land along the FOOT ana
side as may be necessary to protect the
same, and shan be fenced where requlre9ue. 4
4 In case there should not exist public
4 road or roads leading to and permitting
access to the reservoirs, Wnere localeu,
necessary lands and right OF way snail
be acquired and furnished to give such
'NS CONDUIT CAPACITY.
The carrying capacity of all riveted steel
conduits viii be determined by the lSut-
ter formula, taking the co-efIicient ~ 70
/ equal ole sixteen-thousandths)- Tne
smallest interior diameter of the shell as
constructed shall be considered to pc the
diameter of the pipe.
The carrying capacity Of all masonry
/ eonduits or tunnels win be determined by
1 the kutter formula taking the co-ef1clent
/ N to equal o14 (fourteen thoIsandthsl for
brick work. concrete or ashlar S masonry lr.,
lining and .01S eighteen thousandths) Tor
rubbie lining. All such masonry tunnels
or conduits shall be capable of sdellverlng
ing with a free upper surface the water
surface not to be higher than one foot
| below the top of the arch.
The head to be used for computing Ine
capacity of the conduits shall be the dlf-
i ference between the low water lever, or
i the bottom elevation Of the avaiable
4 capacity of the reservoir or reservoirs at
the points of intake, and the height or
/ elevation of delivery at the points OF DE-
livery designated in these specifications.
RIGHT OF WAY.
The right of way for conduits shall in
no case be less than forty feet in width,
and shall be sufficient to enable the Clty ly
in case of purchase fully to protect the
pipe or pipes laid therein, and to maintain
4 and repair the same. The right OF way
/ shall extend from the reservoir or reser-
voirs at the point or points of intake 70 q
the points Of delivery. Each conduit shall
be constructed on one and the same side
cupy more thereof than is necessary.
/ Where the City furnishes right OF way
over lands which it now owns, the con-
duits shall be laid on that part tnereol
designated by the Engineer.
LAYING OF CONDUITS.
The conduits shall be laid in the best
and most thorough manner on true graao
lines On a bed or foundation properly pre-
! pared. and where necessary to procure
i such foundation on piling The curvature
of the pipe shall in NO case pc Sharper
than ten degrees. Cast iron pipe wlta
flexible Joints or other devices accept
able to the Engineer may be used At
stream crossings. II steel pipe is used
where the stream exceeds % feet in wlcsh:
it must have a thickness one-quarter OF
an inch greater than that required for the
same pressure elsewhere.
i Where pipes are laid in excavation, the
top of the pipe shall be covered by at
least three feet of earth, and the pipes
shall be so placed as to bring all me
lcngitrdinal seams on the upper quarter
rof the circumference.
Where the pipe is to be laid across rock.
! swamp or meadow it may be above the
surface Of the ground but must be COW
| cred with satisfactory earth sand or
| gravel, so that it shall everywhere nave
at least three feet OF such covering. In
all such cases, and on ali eTnbankments
the contractor must sow grass seed, CT
j sod. or otherwise protect said embaIK-
ments. Necessary culyerts and other con-
ssrGet.ons must be made to secure he
proper drainage of the adjoining land
CONNECTIONS.
If two steel pipes are laid they are
10 be connected at proper points ana IN
such manner that any section of either
pine between such connections may ne
/ shat off or emptied in order to pe
1 cleaned, inspected and repaired without
| Interfering with the flow of water in any
OF the other sections. II but one pipe IS
la;d proper provisions must be made
far such connections with second pipe
81 thas said conections scan pe mlle
without Interfering with the flow q wateI
in the first pipe. Such connection snail
be made or provided for iminediaf Ely be-
low any intake dams. also on the river
bHtlE nearest the intake at HedcH pDlitl IL
crossing of the Passaic and HackensAek K
Rivers On the opposite bank at such
CROSSINGS a single gate must be placed en-
/ each conduit. Other like connexions
rnusz also be made or provided for, so tina :
there, shall nowhere be a stretch exceed
ing five miles in length without such con-
necticns or provision for such a eonnec-
ton. rn,s
/ Gates or stop valves are to be furnished
and so placed as to divide each pipe inso
proAimately one and oae-half mile sec
ti9ns. and preferably are to be located ON
i SUBMITS. All gates are to be iron-bodied,
-nounted double gates tested 70
800 pounds pressure per square lnch ana
are to be united to the pipe lines by
f.aneed Joints All such gates or stop
valves and all other fittings used on the
curduits shall be equally capable with the
conduit adjacent thereto 70 resist any
pressures or strains to which they may
/ All the composition metal used. excepT-
ing the valve stem, shall be composed OF
eighty-fve per cent. copper, ten per cent {;
have a tensile strength of not less than
% 900 pounds per square inch, with five per
cert eongation in eight diameters ana
FIVE per cent. reduction OF area at oreak-
ing point The valve guides must be
straight and smooth. All face JOINTS
mpst be plain, true and smooth. so as TO
make perfectly watertight joints, with q
4 very thin layer of pure lead cement. Valve
4
A tensile strength of not less than 10000
pounds per square inch. and the screw
threads thereon shall be cut accurately
to work true and smooth throughout The
entire lift of the valve. On the upstream
side of each main stop valve bloW-on
shall be placed and interloeked with tfe
stop valve by proper device, so that the
blow-off must be open before the main
lvalve can be closed.
AIR VALVES.
Fvery summit on the pipe line shall he
nroviCed with an air valve of the most
apprcved pattern and of size properly
pr0rortioped to the duty it has to Der
form and shall be provided with step
valve bolted to a hanged casting or fors
ing riyeted upon the top of the pine.
Similar air valves shall also be placed
on each side of every gate. They shall
be properly encased and protected from
possibility of damage from frost or mis-
chief but so arranged as to be readily
accessible for inspection or testing.
BL0W-OFFS.
In all depressions blow-offs shall ne
located for emptying the pipe. They shall
be provided with two S-inch valves boted
together and to a flanged casting or forg-
ms riy eted upon the pipe. Particular
care must be taken TO have the foundation
for both pipe and blow-off secure from
risk of unequal settlement. An iron Pipe
| shall be provided to carry the water from
the blow-off to natural water-course or
ditch.
The plates used in the construction OF
the coflduits shall in no case be less than
one-nllarfer Of an inch in thickness. and
the working strain due to the static head
llf wa +a,, +f,s which rheV will be subjected