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ST8201-CS 881228 (3) (,INN, INC. CON I NGINEERS December 28, 1988 / I / L. H. Lacy Company / 10888 Shady Trail ~ P.O. Box 541297 ~ Dallas, Texas 75354-1297 ~ Re:/ Denton Tap Road Improvements from Belt Line Road to Sandy Dea~6" Water Line Relocation - B~ We have reviewed your letter of December 19, 1988 regarding the proposed substitution of Pratt 16" Butterfly Valves in lieu of the Waterous, Kennedy, or Engineer approved equal 16" Butterfly Valves specified in the Contract Documents. The material attached to your letter would indicate that you intend for this to constitute a submittal of shop drawings. Please refer to Section 01340 - SHOP DRAWINGS, PRODUCT DATA AND SAMPLES of the Contract Documents for the requirements for submission of Shop Drawings and Product Data. Upon receipt of this letter we ask that you submit six (6) copies of the Shop Drawings for the Valves that you propose to use on the project. While your proposed substitution valve appears to meet most of the specifications contained on pages 45 and 46 of Section 07500 of the Contract Documents, we point out that the valve seat configuration and the disc materials are at variance with the specifications. As such this proposed substitution valve would not ordinarily be considered equal to that specified. In this case, however, the valve installations are necessary for isolation of. the water line only for the purpose of the planned relocation and will not be used for normal operation of the water line. In light of the above we approve the substitution of the Pratt Butterfly Valves for those originally specified. Due to the improper submission of Shop Drawings and Product Data for these valves, L. H. Lacy Company shall have no claim for any delays attributable to consideration or approval of this item. Please call me if you have any questions. Sincerely,/ John C. Karlsruher, P.E. Project Engineer enclosures cc: H. Wayne Ginn, P.E. Randy Fleming, w/2 enclosures Russell Doyle, P.E. Steve Goram, w/2 enclosures 17]()31h'cslonRoad · Suilcl0O · kBIIg ·Dallas, Tcxas7524g · I~honc214/24~_4900 I"1Al',lt. fl::. A C: ] LJ F~:I~: R: .[ 'II:E I"1: :~H:'l iC: I I' l !:::~ I ]. []FI: LE"i-TELh: Of: ]'RANSMI'T'1AI_ BY L. H. LACY COMF-'~-/NY JI.)l-tlXl C. !.::AF(L. 51,dJItEF,:., I':', E, , RAI'~D'/ F:LL;I"IJ:I',itS DI:~Ig'I'ON -I'A'H::' I"~OAD ]:I"li::'[~I]VEM[:'J'qT f:'l:',:[II"l £ilEL..]' L. IFIIL] ]'['] SANI)'~~ L-AK:E: (f:'F~[]J EC'i :J!.;q:3) ['Ii;.::M 5f.J2.'/ ,-" 16" WA[I.3"~ LINE F,~EL[)CA'FI(]i'~ FIE ~L~NS'f'F,:iJI:.: '1 I IJl".I [)F: "FHE I 6" F'CJLI-O~ ]]NG AL.'f EEI:~'NA"I'L::: WATER L. I hiE!: b.lE F:'I ,:A'[" f lIEN 5Ei2.9 - l,'_~" B!_JT]ERFLY VF~L..VE (SEE: D[] C L;M Ei:I',! [' S 2 1 , 1 0 ALI. F',AP:I'L-; 01',1 t'HE I':'f;:(-'.'I f I'qEcHAr, III::AL. Jl.)[NF £:;F. SOUNI.)I,~O(:., B'.J!'tEh:FL',' VAL'~'[: AI::~E~ J.[qll.:']d:;HAl'.:l.:}[£Al:q..[::, Wi'[H WA-['5:'ROIJ!3 ~SEi::,t].E~; ?L~() I~H. FITI:J;:i L.¥ L. H. Lacy Company General Contractors 214/357-0146 10888 Shady Trail P.O. Box 541297 Dallas, Texas 75354-1297 MALVES (F'R,qT I" l:-ffi{A-I 'J ) . I I"tAIqI:::-'YO[J F:L]I::~ IALV[::S AND W~TEROUS VA[.VES ARE [~[]'['H F'IADE YOUR C[:;I,~SIDEI:~),-FION IN FHIS S ~:,Valves lula.r Valves Valves pe.r~tors Systems BURIED SERVICE RUBBER SEAT BUTrERFLY VALVES TECHNICAL DATA FLANGED MECHANICAL JOINT 6" thru 20' (moldsd-in-place seat design) 24" thru 48" {E-LeK seat design) Just like pipe--bury it and forget it Buried valves are often left open for years, but when a line break occurs, they must close quickly and tightly. Buried valves are not usually acces- ;ible for routine maintenance, yet in emergencies they must be reliable. By concentrating on these particular )roblems, Henry Pratt engineers have created the ideal valve lor this demanding duty. No Maintenancu Nued~d Corrosion resistant materials were chosen with care predicated on serv- ice life equal to or exceeding the ~ipeline itself. For instance, the permanent, self-adjusting packing should never need rpplacement. Husky, liberally sized, chemically inert nylon bearings have tested out at over 100,000 cycles. The operator is completely grease packed and life. The rubber seats are molded into the body by a Pratt patented process. The only part exposed to water is the corrosion-resistant disc mounted in the extra-heavy cast iron body. There m no seat retention hardware to cor- rode and loosen, causing the valve to leak. Fast, Trouble-Free Operalion It is never necessary to provide a by-pass arrangement to operate GROUNDHOG valves against pres- sure. Operation in edher direction is an easy task for one man.,, taking less than one minute to open or close.' All GROUNDHOG operators are designed to accept abuse result- lng from high input loads. , , (standard and stipjoint) These rugged operators are rated for input loads of 450 foot pounds of !orque against the operator stops-- a full 50% greater than the operator torque requirements specified in AWWA Standard C504. With this added margin of safety, there is no need to worry that the valve and op- erator will be damaged by inexpe- rienced workmen exerting excessive force when closing the valve. NO Exorcit~a Pro~jran~ A GROUNDHOG valve will never need "exercise" in order to work. The valve is easily operated even after many years of complete neg- lect, This one outstanding advan- tage will lead to great savings in time and budget for any municipality. No need for expensive automatic valve operators. No need for large crews traveling from valve to valve on ex- ercise programs. Tight Shut-Oil A GROUNDHOG valve is bubble-tight under all pressure conditions up to the rated pressure. Tightness is as- sured. Each and every GROUNDHOG valve is tested for leakage belore leav- ing the factory in accordance with Standard C504. Built-In Damage Resistance As the GROUNDHOG disc ap- proaches the closed position, a high velocity area is created which "flushes" the seat. The disc itself "sweeps" debris ahead to keep the seat clean. There are no wells or depressions where particles can lodge and cause damage. I or valves Ihrouqh 30" in diameter on1¥. No Vaults Necessary GROUNDHOG valves are designed for direct burial. Expensive concrete vaults are not required, but if used, cost less because of their smaller size. The only "extra" needed is ordinary soil pipe or ,valve boxes (standard or slip-type joint). W,dt¢ Acceptance GROUNDHOG valves are now in- stalled in over 800 cities in nearly every state. The superiority el this design over gate valves and other butterfly valves in buried service has been shown both in the laboratory and In the field. above, GROUNDHOG valves can be furnished with a number el acces- sories, including the Diviner ground- level position indicator that g~ves ~n- slant valve position and operating available. BURIED SERVICE OPERATORS Ru. LT EXTR^ S.RO.. ^.0 W^ ER FOR E^RS OF TROUBLE-FREE SERVICE Rugged, Feature Packed Construction Designed and developed by Henry Pratt specifically for buried service, GROUNDHOG valve operators ex- ceed the rigid operating require- ments of AWWA Standard C504. They are of the traveling nut type and are self-locking without a unidirec- tional sustained force from the valve. Unlike some operators of other de- signs, GROUNDHOG operators can be relied upon to maintain exact valve position under conditions of fluctuating, turbulent and intermit- tent flow. yet one man can smoothly and easily operate the valve. Stop limiting devices are provided and are capable of withstanding 450 foot pounds of input torque at full open or closed positions without damage to the valve or operator. This is a full 50% greater than that specified in ^WW^ Standard C504 as a mini- mum safety margin against operator abuse.* Moisture Sealed and Water Tight These rugged operators are lubri- cated for the life of the valve. They can be operated without mainte- nance under ground-water condi- tions, and have been lab-tested in submerged operation at water pres- sure to 10 psi. This performance is possible because of the tightly sealed, grease-packed construction. As long as the cover, gasket and to the turns of the nut. In all of the larger sizes, a link*lever arrange- ment provides characterized clos- ure. which by slowing down valve travel as the valve approached the closed position, minimizes the possi- bility of line shock, TURNS REQUIRED_TO OPEN OR CLOSE Valve Size No. of Turns 6" &8" ---- 27 10~-&-12''~ .... 32 -14"& t*6~- .... 30 ~ 18", 20" & 24" 40 30" seals remain intact, there's no need - --* . 44 to worry about damage resulting 36" 215 from water infiltration. 42& 48" 492 Smooth Operation *Operators used in valves above 30" in On 6 inch through 12 inch valve niameterarecapableofwithstanding sizes operation is linear, with valve 300 toot pounds of torque at extreme opening approximately in proportion operator positions. to, 12" Valves i% 10 20 30 40 50 60 70 80 , 90 10~ STROKE (in percent of total travel) Operators for:valves through 12' feature slotted-laver design with Internal stops and adjustments. Operator Characteristic Curves 14" to 48" Valves* Open 90a' O ~_ 4O _ 20 / / / / / l/ 0% 10 20 30 40 50 60 70 80 90 ~00%. OPERATOR STROKE (in percent ol total travel) 'Curve is approximate. Exact characteristic varies with size o! valve sad operator. Operators Ior 14 inch and larger valves leature link-lever arrangement with characterized closure which tends to minimize the possibil- ity ot line shock or water hammer. OPERATOR ACCESSORIES Diviner® Ground Level Position Indicator* The Pratt Diviner Is a Iow-cost accessory that shows at a glance whether the valve is open or closed, which direction and how many revolutions to turn, This amazingly durable indicator is designed for simplicity, strength and utmost reli- ability. All working parts are con- structed of a new non-metallic material that is virtually indestructi- ble in this kind of service. Hermeti- cally sealed, the internal gearing is )rotected from the elements with a clear, tough plastic cover. The Di- viner is shipped for field assembly complete with cast iron adapter (1) and cap screws, guide bushing (2), ~osition indicator (3), flexible washer (4), and a two-inch square AWWA nut (5) with set screw. The adapter fits a standard 5~/4 inch valve box (6) or 5 inch cast iron soil pipe bell, Extension shafts (7) are available In 5-foot and 10-foot lengths and are to be ordered separately at extra cost. Also available at extra cost, but not normally furnished by Henry Pratt, are the soil pipe and valve box (standard or slip-type joint). Standard AWWA Nut A two-inch AWWA nut is standard. It may be operated through a five- inch soil pipe or 51/4 inch valve box if desired. Soil pipe or valve box are not normally supplied by Henry Pratt Company but can be furnished, when requested, as an added cost acces- sory. Optional Extension Stem The extension stem may be used to extend the position of the standard 2" AWWA nut closer to grade. It may be used in conjunction with a stand- ard 51/4 inch valve box or with 5 inch soil pipe. A 1~/4 inch square exten- sion stem, fitted with a self-centering device, Is furnished in 5-foot and lO-foot lengths for cutting and as- sembly In the field. Removable Cover Optional ~ Handwheel When vault operation is desired, a handwheel may be required. In sizes 6 inch through 24 inch, the handwheel will be 12 inches In di- ameter; for 30 inch valves and larg- er, 18 inches in diameter. The Handwheel fits directly on the stan- dard AWWA nut and is removable. VALVE END TYPES All end types on the following three pages are standard and stocked in the sizes listed in the dimension charts. These dimensions are correct at time of publication, but are not to be construed as certified drawings. Certified drawings, available upon request, include more details of valve dimensions. For plastic/PVC pip~e either the mechanical joint end or as,beslos cement end valves can be used. depending on the pipe O. D. in either case. rubber gaskets to adapl the valve lo the pipe O.D. must be furnished by the pipe supplier FLANGED 6';20" NOM. VALVE A B C D° E F G K Q R SIZE 10 9 9~i 16 I%~ 12.~ t4% 4~ 4V, 12 )OV~ ll~ i9 I% I?.~, I~ 4% 4V~ 6Yl 14 )IA l~ 21 lA I~.l 18F~ 5~/t~ 5%~ 20 16 ii 27~/~ I'%* 20.iV, 25 6 6% llV, Notes: All dimensions shown in inches 'D -~ %~" for 10" valves 'D -~ ',,~~ for 12~ and larger valves FLANGED 24"-48" NOM. VALVE A B C O E F G J Q S SIZ~ ~ 21V~ 24% ~% 12 2Ve 28-1% 36 9Vz 10ih~ 20V~ 25t/re 28V, 46 12 2~e 32-1V~ 42% 11W~. 42 ~% 32'/, 53 t2 2% 36-1% 49'/2 15% 1. ~1 di~n~ons shown in inches. "D" dimension ~' for 24' Ihm 48" ~/.' I~ger than diameter el ~lt. Noles: MECHANICAL JOINT 6"-20" NOM, VALVE A B C O E F G K X SIZE 6 6Y, 5V~ 11 8V~ 1%~ 6-~ 9Vz 3'%~ 3~ ,42 29% 327/. 53 22 2 28-1% 5~/, 14 157/, 23% 29 42 29% 32% 53 22 2 28-1V4 5~/*14 11~=h~18% 25Ve 48 34%~ 37% 5g;/~ 24 2 32-1V4 57V=16 16=/~ 23=/~ 29 Notes: 1. Ail dimensions shown in Inches. ~lt ~les ~11 ~ ~' ta~er than dlameler of bolt 2. Operator mounted In ~sitlon as shown. 3. Exlension slem can ~ us~ with standard val~ ~xes or 5" ~il pi~. '4. These dimensions are for uni-dir~tional sewice ~ly. FLANGED x MECHANICAL JOINT 6" & 8" VALVE A . C CC O OD E EE F FF 6 OG X ,~,' 1. All dimensions sho~ In inches. ~ adapter se~ion ~en I FLANGED x ASBESTOS CEMENT 6", 8", 12" I VALVE A B C CC O DO [ F G K Q R X 6 6% 5% 9 ]1 7% 2~ I 8-% g~ 3:s/l~ 3Y~ 5~ lurnlshed by others: ASBESTOS CEMENT 6'~16'{ " VALVE A 9 C O K O R X 16 13% 14~/2 21% 14 55h6 5~he 9% 4% ~ I Nole: All dimensions sh~n in i~hes VICTAULIC 10"-20" ~,. 12 iO~> lib, {4% 8 WL,~ 4~/~ 4~i 6~ 18 14~ 1571 20W~ 8 IV, 6 6~i llg~ 20 16 11 22F{ 8 {)/1~ 6 6% I1% ViCTAULIC 24'~48" NOM. VALVE A B C 0 E F G ' H d Q SIZE 48 37~h 407/e 59'~/,~ 24 Ts/~ 3%~ 58"1. 60~6 ~6~I, 2331e 29 2. All dimensions shown in inches. 4. Extens~stemcan~us~w~hstandardvave~xesor5'~dP~. F (Flow tow~ds flatside of d[~.) CONCRETE PIPE ENDS 30"-48" VALVE A e C O E J Q S X 30 21Vt 24~ 36W,, 18 34%2 9"/,, 10%8 36 257/1~ 28~/4 43t~6 22 41t/32 1211/t6 18~ 25~/8 15t/4 42 297/. 32~/8 50~/~6 22 47W32 16% 23~ 29 14Vz 48 34Vte 37V~ ~ 24 51%~ 16% 23~e 29 16Y~ 1. Nldi~ns~ns shown in inches, 4. ExlenM~ stem can ~ used with stand~d valve ~xes or 5" EASY, ECONOMICAL INSTALLATION, NO MAINTENJ NCE GROUNDHOG rubber-seat butterfly valves have inherent advantages over gate valves for water distribution service. Here are a few direct comparisons for consideration, Ease of Operation Groundhogs are designed with minimal friction for easy one-man operation against full rated pressure and without requiring a power operator. Gate has inherent high friction loads requiring several times the input force, often requiring more than one man or a power operator. Shut Off Regardless of size end years without operation, shutolf of Groundhogs is quickly accomplished with minimum need for men and equipment. In severe cases, gate shut off may require many men, power operators, and trucks; even nearby valves may have to be operated to achieve shut off. Tlghtrtell ~ Groundhogs offer tight shut'off ~ear in and year out regarc~less of ' frequency of operation; however, tight shutoff of gates is not assured and leakage may increase with wear and corrosion of wedges and seats. Repairs Groundhogs have no metal-to-metal contact thereby reducing wear; disc edge will not freeze to rubber seat. Separate operator unit is kept free from galvanic corrosion. On the other hand, gate operating mechanism is submerged and moving parts are in metal-to-metal contact. Initial Installation Groundhog valves are completely suitable for direct burial and vaults may be eliminated where policy permits. Gate valves require larger, more costly vaults. Bulk and Weight Face-to-face and outside dimension savings of about one third and weight savings up to one half make Groundhogs easier to Install.,, underground at less cost. ,~, .~ Seating Discs of horizontal stem Groundhogs sweep the seat bottom clean of foreign matter with each closing. In a gate foreign matter deposits can prevent full stem travel and prematurely activate wedges. Periodic Maintenance Groundhogs are operable and leak free without maintenance. Gates require periodic cycling end sometimes gland repacking to assure operability, SUGGEST~ SPECIFICATIONS: RUBBER-SEAT Bu'rrERFLY VALVES FOR c.,-n~.r.l A~l butterfly valves shall be of the tight-closing, rubber*seat type with rub- bar seals Ihal are securely faslened to tho valve body. No metal-lo-metal seating surfaces will bo permitted. Valves shall be bubble-tighl al rated pressures with flow in either direction, and shall be sat- isfactory for applications involving throt- tling service and/or frequent operation and lot applications involving valve op- eralion after long periods .of Inactivity. Valve discs shall rotate 90° from the full open position to the tight shut position. Valves shall meal structural requ0re- merits of AWWA Standard C504, Class 150B. The manufacturer shall have manufactured tight-closing,' rubber-seat butterlly valves for buried service lot a period of at least 10 years. Ali valves shall be Henry Pratt Company "GROUNDHOG" valves or approved equal. 1. V.Iv(, Bodies and Flanges Valve bod- ies shall be constructed of cast iron ASTM A-126 Class B and shall~have either integrally cast mechanical joint ends, ends Ior asbestos-cement p~pe, v~ctaulic couplings or shall be Ilanged. Flange drilling shall be in accordance with ANSI B16.1 Standard for cast ~ron Ilanges. Two Irunnions lot shaft bearings shall be integral wdh each valve body, Body Ihickness shall be in stricl accord- ance wHh AWWA Slandard C504, Class 150B. ? v,~h~e Discs Valve discs shall be con- 51ructed el al~oy cast iron ASTM A-436 Type 1 (valves 6" through 20"). Larger sizes: Ductile iron with stainless steel seating edge (30" through 48" size) or cast iron wdh stainless steel sealing edge (24" s~ze only). '3. Valve Shafts Shafts of all valves shall be turned, ground and polished. Valve shalls shall be constructed el 18-8 Type 304 stainless steel. Shall di- amelers must meet minimum require- ments established by AVVVVA Standard C504 for Class 150B. 4. Valve Seats Valve seats shall be a synthetic rubber compound. Valves 20' and smaller shall have bonded seats. Bonded seats must be simullaneously molded in, vulcanized and bonded ~o the body. Seat bond must withstand 75 lbs. pull under lest procedure ASTM D429. Melhod B. Valve seals on 24-inch diameter valves and larger shall be field adjustable and replaceable wilhout dismantling opera- tor, disc or shall. Seats shall be retained in the valve body by mechanical means without use of metal refainers or other devices Iocaled in the flow stream. 5. Valve Rearings Valves shall be fitted with sleeve-type bearings. Rearings shall be corrosion resistant and self-lubrica- ling. Bearing load shall not exceed 1/5 of the compressive strength of the bearing or shaft malarial. 6. Valve Operators Valve operators shall conlorm to AWWA C504. Manual operators shall be of Ihe traveling nut, self-locking type and shall be de- signed to hold the valve in any Intermedi- a~e position belween full open and fully closed without creeping or fluttering. Operators shall be equipped with me- chanical stop-limiting devices to prevent overlravel of the disc in the open and closed positions. Operator housings, sup- ports and connections to 1he valve shall BURIED SERVICE have provisions for four-bolt mounting. Operators shall be equipped with a 2" square operating nut and shall be fully gasketed and grease packed for buried service. Valves shall close with a (clock- wise) (counter-ciockwise) relation of the nut. On 6-inch through 30-inch diameter valves, operalor components shall wilh- stand an input torque of 450 ft. lbs. at the exlreme operator posilions without dam- age. On 36-inch diameter valves and larger, operator components shall with- stand an input torque of 300 ft. lbs. at ex- frame operator positions without damage. ?. Painting All surfaces of the valve shall be clean, dry and free from grease before painting. The valve inlerior and exlerior surfaces except for seating shall be evenly coaled wilh asphalt varnish in ac- cordance with Federal Speciflcallon TT-V-51 and AWWA Slandard C504. 8. Testing Hydroslatic and leakage tests shall be conducted in strict accordance with AWWA Sld. C504. 9. Valve Position Indicator A valve posi- tion indicator shall be furnished for all valves tar installation in a valve box. The valve indicator shall be hermetically sealed for tnslallation inside a cast iron valve box and shall show valve-disc post- lion, direction of rotation and number of lurns from full open to full close. This in- dicator shall be provided by the valve manufacturer. 10. Proof of Design The manufacturer (supplier) furnishing valves under the specification shall be prepared to show proof that the vaives proposed meet the design requirements of AWWA C504.