The Memphis appeal. [volume] (Memphis, Tenn.) 1886-1890, 1886-12-05

Uterine at the rate ofs7,5CO,OCo gallons ia
tEeuty-four hOurs
Now, a portion of this water pumped but
not filtered, must be wasted in washing the
hltering bed. In Their specification, the
Filter Company a ume that this quar tity
will be about 2 per cent. of the whole
amount pumped. but in the sbsence OF re-
liable data reg rding this washing operation
on so large a scale, AN dis osed to inc ease
this proportion to at leafs pc cent, which,
i think, will be more re liable for safe esiI
mae of cost. From various reports the
performance snd cost Of operating pumping
works, il Us safe u assume that in the ca Q OF
the proposed works for Memphis IL will cost,
including coal and all Cp rating expenses
and repairs 70 machinery, ga CO IL to raise
l,0O0,000 gallons Of water one foot bigh, OF
which amount about 20 per cent. will be for
fuel and the lema Mug 30 DER cent. for
operating and other expenses. In my
former computations Of the cost Of
tie coal to raise this water for washing !;
hence ! can now add OILY the expense of
operating the works VIII 10 pumping the wa.
ter for wSshing. AS shown above, this Will
be 30 Per cent. OF the whole cost, or 95.lOO
cents for each 1,O01.0C0 ga Ions raised one
foot high. Hence, 3 per cent. If 750O,OOO g
221a per cent OF C00,000 VIII CHI multiplied
by 95. 100 cents null Jiplied by 40 feet, gives
in round numbers "A IS. 100, ray 70 cen rs per
day, as the cost of the water used in wash
ing the nlters' .
these filters prop ly the service OF two men
will be rs CURED, the Agf regate pay OF which
would be 5000 per year. One OF there men,
however, might be otherwise EN- ploy ed when
not washing tue filters.
While pumping the water for washing the
altering NJ aterial the pumping machinery
will have 10 pump under head OF 1876 feet,
aud will in consequences have TO be OF sufi-
eisnt str sngth for this work. slthoughlpump.
ing at reduced rate of capacity. The adui-
tiOnal cost of this can only be determined
upon opening the proposals submitted BY the
builders of the machinery
Mr.. Hya.ts estimate Of the cost Of renew.
ing the STEERING material washed ont 10
washing the filters, also in renewing the
coke, 10 about 6O per year. The cost of 90
sgulant at 81 per million gallons would be
81 so per dav. To all # these expenses must
bs added the interest on the cost Of the filters
and foundat Ons, say $lCo,0OO at 6 per cent,
or $500 per year.
Filter Company have My been able to make
Of the practical workings Of this filter, It is
impossible for the engineer TO predict with
certainty its success or its failure, when
adopted for works of as large capacity as
those proposed for Memphis; bat in view of
the ingenuity displayed by the inventor, as
well as the energetic character ne has thus
far shown in bringing this Invention to its
present stage Of perfection, / can see no
reason why, should this filter be adopted at
the Memphis water works, IL should not
prove an entire success.
i would, therefore, recommend that the
water committee adopt this plan of fltration,
should its expense not exceed the limit of
authorised expenditure keSPfflfSly sub
Mechanical Engineer, Quintard Iron Works,
New York City.