|
ed septum surface. In the case
<br /> of fabric septums, the area com-
<br /> putation will be made on the
<br /> basis of measurements of the
<br /> sep~um support in a reasonabl}
<br /> constant plane. Area allowanc~
<br /> 2~ball not be granted for folds
<br /> the septum fabric or dorie-
<br /> s in the septum surface
<br /> -ich ~'ould easily bridge.
<br /> c. The tank containing the fil-
<br /> ter elements shall be construct-
<br /> ecl of steel, plastic or other suit-
<br /> a/ble malerial, which will satis-
<br /> factorily provide resistance to
<br /> .corrosion, with or without coat-
<br /> ing. t.'ressure filters shall be de-
<br /> signed for a working pressure
<br /> equal to the shut-off head of
<br /> the pnmp with a factor safely
<br /> of ,L Vacuum filters shall be
<br /> designed to withstand the pres-
<br /> sure developed bv the weight of
<br /> the v,'ott~r contained therein and
<br /> closed vacuum filters shall, in
<br /> addition, be designed to with-
<br /> stand the crushing pressure de-
<br /> veloped under a vacuum of 25
<br /> inches of mercury, both with
<br /> factor safety of 3.5.
<br /> In either type filter where the
<br /> tank is fabricated from material
<br /> · which is corroded by water.
<br />-then a suitable corrosion resis-
<br /> tant coating shall be applied to
<br /> retard such attack.
<br /> · d. The filter elements shall he
<br /> -~fabricated of corrosion resistant
<br /> material throughout. They shall
<br /> be designed to be adequately-re-
<br /> sis[ant to a differential pres-
<br /> · sure between influent and efflu-
<br /> ent of not less than the maxi-
<br /> mum ~pressure, which can be de-
<br /> veloped by the circulating pump
<br /> and shall be of edequate strength
<br /> to resist any additi'onal stresses
<br /> developed during the cleaning
<br /> operation. The filter septum, on
<br /> which the filter-aid cake is de-
<br /> posited, shall ~e provided with
<br /> ~)penings, the minimum alison-
<br /> sans of which shall be n~t
<br /> greater than 0.005 inches.
<br /> e. Provision shall be made to
<br /> t_roduce filter aid into the filter
<br /> such a way as to evenly pre-
<br /> t t.he filter septum before the
<br /> ~er ~s placed in operation. The
<br /> amount of filter aid shall be sel-
<br /> ected to provide at least the
<br /> same protection to the filter sop-
<br /> turn as would be provided by
<br /> the use of 0.1 lbs. of diatomite
<br /> filter aid per square foot of fil-
<br />ter area. Use of additional equip-
<br /> ment to provide body feed to
<br /> the filter influent is optional.
<br /> %¥here provided, such equipment
<br /> shall have the capacity to con-
<br /> tinuously and uniformly feed at
<br /> a rate of not less than 0.1 l.bs.
<br /> of filter aid per square foot of
<br /> filter area per' 24 hours. ·
<br /> f. The filter piping shall be so
<br /> designed that during the pre-
<br /> coating opera, tion the effluent
<br /> from the filter shall be recircu-
<br /> lated or run to waste and shall
<br /> not be fed into the pool until
<br /> free of filter aid. An exception
<br /> to this requirement may be made
<br /> if the filter septum is of suc~
<br /> construction that no perceptible
<br /> quantity of filter aid is intro-
<br /> duced into the pool when the
<br /> effluent discharges therein.
<br /> g. Where dissimilar metals are
<br /> used in the construction of the
<br /> filter, which' may set up gal~
<br /> vanic currents, then suitable
<br /> provision shall be made to re~
<br /> sist electrolytic corrosion.
<br /> h. FiIter shall be so designed
<br /> and installed that they can be
<br /> readily disassem, bled and the
<br /> filter elements removed.
<br /> 5. CARTRIDGE TYPE FILTERS
<br /> ---Cartridge type filters are those
<br /> where the cartridge itself is the
<br /> filter aid. Cartridge filters can be
<br /> either pressure or vacuum type
<br /> and are subject to the same gen-
<br /> eral piping and tank specifica-
<br /> tions as diatomite-type filters.
<br />~ ~lacement cartridges are divid-
<br /> end two types: depth and area.
<br /> ~ral specifications, however,
<br /> a,c the same for both. Cartridge
<br /> filters shall not require the
<br /> dition of an flocculating agents
<br /> such as ammonium alum. alumi-
<br /> num sulfate or potassium alum.
<br /> They shall be subject to the same
<br /> requirements listed under "Me-
<br /> chanical'' for all types of fil-
<br /> ters. All types of cartridges shall
<br />
<br /> .have sufficinet structural strength
<br /> to resist rupturing, channelling,
<br /> .collapsing, or bursting at a max-
<br /> ~mum pressure differential of
<br /> 50 psi. Cartridge seals shall be
<br /> so designed as to prevent any
<br /> by-passing of unfiltered water.
<br /> If provision is made for back-
<br /> washing, it shall be so arranged
<br /> as not to permit an backwash
<br /> Water to enter the recirculating
<br /> system. No residue shall be per-
<br /> mitted to remain in the filter
<br /> housing that could be picked up
<br /> in the next filtering cycle.
<br /> Cartridge elements shall be di-
<br /> vided into two types:
<br /> a. Depth type cartridges are el-
<br /> ements where the porosity var-
<br /> les from the inlet to the dis-
<br /> charge surface. They shall have
<br /> sufficient depth to provide
<br /> equate dirt-holding capacity and
<br /> q~e designed for a flow of no
<br /> more than one gallon per minute
<br /> per 5 cubic inches of volume
<br /> with a pressure drop not to ex-
<br /> ceed 2 psi across clean cartridg-
<br /> es and not to pass any particu-
<br /> late matter larger than 25 mi-
<br />
<br /> b. Area Or surface type cartrid-
<br /> ges are those which rely on the
<br /> surface area for their dirt-hold-
<br /> ing capacity and they .should fol-
<br /> low the same flow per square
<br /> foot of area as diatomite filters
<br /> namely: 3 gallons per minute per
<br /> s~uare-foot of area for pressure
<br /> filters and 2-1/4 gallons per
<br /> minute per square foot of ,filter
<br />
<br /> ¢. Ail filters shall be designed
<br /> so as to permit easy removal of
<br /> the cartridges.
<br /> B. RECIRCULL&TING PUMPS --
<br /> The recirculating pump shall have
<br /> sufficient capacity to provide the
<br /> rated flows of the filter system.
<br /> without exceeding the head loss
<br /> at which the pump will deliver
<br /> such flows. The pump motor shall
<br /> not be operated at an overload
<br /> which exceeds the service factor.
<br /> a. Pool pump shall be equipped
<br /> on the inlet side with an approved
<br /> type hair and lint strainer, ex-
<br /> cept for vacuum type filters
<br /> where water passes through filter
<br /> befdre reaching pump, The bas-
<br /> ket of the strainer shah be non-
<br />
<br /> surface of at least four (4) times
<br /> the cross sectional area of the in-
<br /> let pipe.
<br /> C. POOL PIPING--Shall be sized
<br /> to permit the rated flows for fil-
<br /> tering and cleaning without ex-
<br /> ceeding the maximum head, at
<br /> which the pump will provide such
<br /> flows, l~x K®n®ral, the water veloc-
<br /> ity in the pool piping should not
<br /> exceed ten (10) feet per second.
<br /> Where velocity exceeds 10 feet
<br />
<br /> should he provided to show that
<br /> rated flows are possible with the
<br /> pump and piping provided. The re-
<br /> circulating piping and fittings
<br /> sh~ll meet the-'following require-
<br /> ments:
<br /> a. The vacuum fitting(s) shall be
<br /> located in an accessible posi-
<br /> tion(s) below the water line.
<br /> b. A main outlet shall be,placed
<br /> at the deepest point in every pool
<br /> for recirculating and emptying
<br /> the pool.
<br /> c. Pool recirculation piping, pass-
<br /> ing through the pool structure,
<br /> shall be copper tubing (with
<br /> minimum wall thickness of type
<br />"L" brass or an approved equal·
<br /> d. Filtered water inlet(s) shall
<br /> ~be provided in sufficient quantity
<br /> and shall be properly spaced to
<br /> provide a maximum circulation of
<br /> the main body and surface of the
<br /> pool water.
<br /> e. A reeirculating skimming de-
<br /> vice shall be provided to skim the
<br /> surface of the pool.
<br /> f. All materials used in pool re-
<br /> circulating system shall be non-
<br /> toxic.
<br /> D. VALVES--Fullway valves shall
<br /> be installed throughout, to insure
<br /> proper functioning of the filtra-'
<br /> tion and piping system.
<br /> a. i valve shall be installed on
<br /> the main suction line located in
<br /> an accessible place outside the
<br /> walls of the pool when pump is
<br /> below overflow rim of the pool.
<br /> b. Valves up to, and including
<br />
<br /> two (2) inches in size, shall be
<br /> brass. Sizes over txvo (2) inches
<br /> may have cast-iron or brass bod-
<br /> ies. All working parts of Yalves
<br /> shall be non~corrosive material.
<br /> c. Combination valves may be
<br /> stalled if the materials and de-
<br /> sign comply with the intent of
<br /> these standards.
<br /> E. HE:ATERS __ Gas fired swim-
<br /> ming pool heaters and swimming
<br /> pool boilers must comply with all
<br /> applicable ,American Standard Ap-
<br /> proval requirements including A.
<br /> G.A. and A.S.}I.E. standards. Oil
<br /> burning equipment must he ap-
<br /> prey.ed by U.L. or other nationally
<br /> recognized testing agency. All such
<br /> equipment shall carry the corres-
<br /> ponding seal of approval by the
<br /> appropriate agencies.
<br /> F. %VA. TER SUPPLY--The potable
<br /> water supply to any swimming
<br /> pool sh~ll be installed as required
<br /> in ~atWA Standards.
<br /> a. Unless an approved type of fill-
<br /> ing system is installed, such as
<br /> is required by A'WWA, any source
<br /> o~ water which may be used to
<br /> fill the pool shall be equipped
<br /> with backflow protection.
<br /> ,b. No over the rim fi. Il spout will
<br /> be accepted unless located under
<br /> a diving board or installed in a
<br /> manner approved by local author-
<br /> ities so as to remove any hazard.
<br />Section 4. Electrical Devices---Elec-
<br /> tric wiring, fixtures, overhead and
<br /> underwater lights and all electri-
<br /> cal devices appurtenant to the pool
<br /> shall be approved by the National
<br /> Underwriters Laboratory. and meet
<br /> the requirements of the City Elec-
<br /> trical Code.
<br />Section 5. TESTS---All pool piping
<br /> and t;he installation and construc-
<br /> tion of the pool piping system
<br /> shall be in accordance with the
<br /> approved plans. The entire pool
<br /> piping system shall be tested with
<br /> a w~ter test of fity (50) P.S.I. and
<br /> proved tight before covering or
<br /> concealing.
<br />~ection 6. CHEMIC~AL TREAT-
<br /> ME,'T--The pool owner shall be
<br /> instructed in the proper care and
<br /> maintenance of the pool, including
<br /> the use of high test calcium hypo-
<br /> chlorite (dry chlorine carrier) or
<br /> sodium hypochlorite (]iquid chlor-
<br /> ine carrier) (or an equally effec-
<br /> tive germicide and algaecide) and
<br /> the importance of proper pH (al-
<br />kalinity and acidity) control.
<br />Section 7. SW'IMMING POOL SAFE-
<br /> TY DEVICES---Because of variable
<br /> conditions encountered, it is im-
<br /> practical to lay down defini, te de-
<br /> tailed rules of procedure for de-
<br /> termining the protective devices
<br /> required for swimming pools.
<br /> Every person owning land on
<br /> which there is ~ituated a swim-
<br /> ming pool, fish pond or other body
<br /> of water which constitutes an ob-
<br /> vious hazard and. is eighteen (18)
<br /> or more inches in depth at any
<br /> point, .shall erect and maintain
<br /> thereon an adequate enclosure
<br /> either surrounding the property or
<br /> pool area, ,su{ficient to make such
<br /> a body of water inaccessible to
<br /> small children. Such enclosure, in-
<br /> cluding gates therein, must not be
<br /> less .than four (4) feet above the
<br /> underlying ground; all gates must
<br /> be self-latching with latches plac-
<br /> ed four (4) feet above the under-
<br /> Iying ground or otherwise made
<br /> accessiq~le from the outside to
<br /> small children.
<br /> A natural barrier, hedge, pool cov-
<br /> er or other protective device
<br /> proved by the governing body may
<br /> be used so long as the degree of
<br /> protection afforded by the alter-
<br /> nato devices or structures is not
<br /> less than the protection afforded
<br /> by the enclosure, gate and latch
<br /> described herein,
<br />Section $. REGULATIONS
<br /> l. Swimming pool waste water
<br /> shall be disposed of a,s hereinaf-
<br /> ter ,set forth in this section and
<br /> the type of disposal proposed
<br /> shall be approved 'by the Admin-
<br /> istrative Authority prior to the
<br /> commencement of any work.
<br /> 2. Except as provided in Item 4
<br /> of this Section, when a public
<br /> sewer or StorIrl drain of edequate
<br /> capacity is available for use,
<br /> swimming pool waste xvater shall
<br /> be discharg~,d thereinto and per-
<br /> mission shall be obtained in writ-
<br />
<br /> lng from the proper authority so
<br /> to do. A copy of such permission
<br /> stating the maximum size of the
<br /> waste line between the receptor
<br /> and the sewer shall accompany
<br /> any- ~pplication for a permit made
<br /> to the Administrative Authority.
<br /> 3. W'here ,space and conditions
<br /> such that no hazard, nuisance
<br /> ins.anitary condition is evidence~
<br /> swimming pool waste water may
<br /> be used for irrigation by surface
<br /> or su%surface spreading.
<br /> .l. '~,Vhen no other means of waste
<br /> water disposal are available, a
<br /> dry-well may be installed, Such
<br /> drywell shall be constructed in
<br /> the manner prescribed elsewhere
<br /> in the installation requirements
<br /> of this code for cespools and shall
<br /> have a capacity of at least twice
<br /> the amount of water discharged
<br /> during one (1) normal backwash
<br /> operation, but shall in no case
<br /> have less than a ten (10) foot
<br /> vertical sidewall. When other
<br /> drains are connected, the size of
<br /> such dr}~vell shall be proportion-
<br /> ately increased to the satisfaction
<br /> of the Administrative Authority.
<br /> No waste water other than that
<br /> from a swimming pool shaH dis-
<br /> charge into such drywell, and no
<br /> waste water from any swinlming
<br /> pool shall discharge into a pri-
<br /> vate sewage disposal system.
<br /> 5, No direct connection shall be
<br /> made between any storm drain,
<br /> sewer, drainage system, drywell
<br /> or su, bsoil irrigation line and any
<br /> line connected to a swimming
<br /> pool.
<br /> 6. Waste water from any filter,
<br /> scum gutter, overflow, pool emp-
<br /> tying line or similar apparatus
<br /> Or appurtenances shall discharge
<br /> into an approved type receptor.
<br /> T.he flood rim of each such re-
<br /> ceptor shall be at least six (6)
<br /> inches above the flood level of
<br /> the adjacent ground.
<br /> ?. Each such receptor when con-
<br /> nected to any part of a drainage
<br /> system shall be properly trapped
<br /> and vented as provided ~or in the
<br /> installation requirements of this
<br /> code.
<br /> 8. Except as provided in Item~/
<br /> of this Section, the discharge
<br /> let terminal from any pool 5.
<br /> filter shall be protected from
<br /> backflow by an air gap at least
<br /> six (6) inches above the flood
<br /> rim of the receptor.
<br />9. No scum gutter drain, overflow
<br /> drain, backwash discharge drain.
<br /> or pool em,ptying line shalI enter
<br /> any receptor 'below the rim un-
<br /> less the pool piping at its deep-
<br /> est point, the bottom of the fil-
<br /> ters, and the bottom of the scum
<br /> gutter drain trough, or overflow
<br /> in'lets, are at least six (6) inches.
<br /> above the overflow rim of the re-
<br /> ceptor.
<br />10. Swimming pools shall have the
<br /> bottom and inner sides construct-
<br /> ed of smooth non-absorbent ma-
<br /> terials and be so constructed as
<br /> to be properly drained through
<br /> one or more metal grated open-
<br /> ings. eM1 such drains shall have
<br /> a gate valve installed therein, lo-
<br /> cated in an accessible place or
<br /> masonry pit outside the walls of
<br /> the pool.
<br />11. The potable water supply to
<br /> any swimming pool shall be in-
<br /> stalled as required in Chapter 10
<br /> of the Installation Requirements
<br /> of this code.
<br />12. Swimming pool water heating
<br /> equipment shal.l conform to the
<br /> design, construction, and installa-
<br /> tion requirements set forth in the
<br /> Installation l~equirements of this
<br /> code for domestic water heaters.
<br />]AFETY ROPE ANCI-IORS -- Pro-
<br /> vide lifeline anchors at transi-
<br /> tion point, except xvhen the max-
<br /> imum water depth does not ex-
<br /> ceed 5' 0".
<br /> NOTE: The foregoing applies
<br /> only to outdoor swimming.
<br /> bathing, or wading pools. Plans
<br /> and specifications for all in-
<br /> door installations shall be sub-,
<br /> mitred to the Administrative/
<br /> -a~uthority for approval prior tck
<br /> the commencement of any work,
<br /> and all piping equipment and
<br /> construction shall be equal to
<br /> the t~pes prescribed in the In-
<br /> stallation Requirements of this
<br /> code for indoor work.
<br /> Pub. 5lay 3, 1962.
<br />
<br />
<br />
|