American Flanged Pipe - ejprescott.com

1 SECTION 8 AMERICANF langed Pipe8-1 American Flanged PipeThe principal standards covering Flanged pipe are ANSI/AWWA C115 ANSI/AWWA C110 These and other standards are referencedthroughout this Section either by the full ANSI/AWWA designation or by onlythe AWWA numbering, such as AWWA produces 4 - 64 ductileiron Flanged pipe with threaded flangesfor water or other liquids in accordancewith AWWA C115. Maximum length offlanged pipe is 17 6 , 19 0 , 19 6 , or20 0 , depending on size; any length lessthan maximum can be furnished down tominimum practical lengths, varying alsowith pipe size. Flanges generally arethreaded on all Flanged pipe , except forshort lengths of pipe which may be pro-duced statically with integrally cast flangesas shown in Table Nos.

2 8-9 and 8-10; staticcastings are manufactured in accordancewith applicable requirements of pipe is generally specified foraboveground service for air, water,sewage, oil and other liquids where rigid,restrained joints are needed. It is widelyused in industrial piping systems, watertreatment plants and sewage treatmentplants, and for other interior runs of Flanged pipe should nor-mally include design provisions for thermalexpansion and contraction, such as flexiblejoints or couplings at strategic may be furnished with one endflanged and the other end with Fastite bell,mechanical joint bell, restrained joint bell,plain end, grooved or shouldered end, orwith other type end as may be underground use of the flangedjoint is generally not recommended due tothe rigidity of the joint as noted in appen-dices of appropriate ANSI/AWWA pipe is rated for a maximumworking pressure of at least 250 psi asspecified in the tables in this Section.

3 TheAWWA C110 and C115 flanges (as well asthe flanges faced and drilled per Class 250) are also rated for maxi-mum water working pressure of at least250 psi. The flanges faced and drilled perANSI Class 250 are special; they donot match other flanges and are infre-quently furnished. American furnishesthese only as a transition from equipmentwith these flanges to regular AWWAC110 or C115 flanges. These flangesfaced and drilled per ANSI Class250 are shown in Table Nos. 8-11, 8-12and 8-13 which are shaded to signify theirspecial Flanged pipe insizes 24"and smaller is rated for 350 psiworking pressure only when AMERICANT oruseal gaskets are used. In some casesother sizes of Flanged pipe have been sup-plied for working pressures greater than250 psi, again when joined withAMERICAN Toruseal gaskets.

4 CheckAMERICAN for and LiningsThe standard outside coating forflanged pipe is a one-mil-thick asphaltic paint, but other outside coatings perSection 11 can be furnished when specified. 8-2 While other linings are available as describedin Section 11, cement lining, per AWWAC104, is usually furnished in Flanged American is given the option, Flanged pipe is normally furnished cementlined depending on rust preventive coating is applied tothe machined faces of the flanges; this coat-ing may be removed prior to Barrel and FlangesDuctile iron pipe barrels conform tothe requirements of AWWA C151. Allflanges furnished by American forthreading on ductile iron pipe are ductileiron in accordance with AWWA C115.( American recommends only ductileiron flanges for strength and safety,though AWWA C115 currently allowsboth ductile iron and gray iron flanges.)

5 Flanges conform to the chemical andphysical properties specified for ductileiron fittings in AWWA minus thickness tolerances of thepipe barrels are shown barrels and flanges have taperedpipe threads (NPT) in accordance withANSI adapted to the ductile iron pipeoutside diameters. The flange is threadedonto the pipe and machine tightened untilthe pipe end projects beyond the face ofthe flange; it is then machined to give aflush finish of the pipe end and flange andto ensure that the flange face is perpen-dicular to the axis of the pipe . The flangeis designed so that a shroud substantiallycovers the working threads of the pipe forthread protection. Prior to assembly of theflange on the pipe , a commercial-gradethread compound is applied to the threadsto ensure leak-free Flanged pipe is shop fab-ricated in accordance with AWWA C115and threading at the job site is not recom-mended.

6 Flanges furnished on pipe arenot interchangeable in the field and gen-erally cannot be removed after fabricationwithout damaging the pipe and/or flangethreads. If installation conditions requireassembly of the flange on the job, theflange may be factory assembled to a hand-tight condition. This permitsremoval and re-assembly at the job site atwhich time suitable thread compoundmust be used. Hand-tight flangesshould be limited to 16 and smaller sizesbecause of the difficulty in tighteninglarger flanges at the job MATERIALSJ oint materials are normally furnishedfor all mechanical joint bell openings onpipe or fittings. With the exception ofAMERICAN Toruseal gaskets specificallyrecommended for superior performance, Flanged joint materials are not normallyfurnished by American , although theyare generally available from stock.

7 SeeTable Nos. 8-2 in this section and 8-3 inDetails and Flanged bolts are not generallyfurnished by American , the following isgiven for information : An additional minus tolerance of " is permittedalong the barrel of the pipe for a distance not to exceed 12".Table No. 8-14"-8" "-12" "-42" " "-64" ToleranceAWWA Ductile iron flange; 2 Ductile ironpipe barrel; 3 American StandardPipe Threads, ANSI , adapted toductile iron outside diameters; 4 Pipeend and barrel machined simultaneouslyto a flush finish; and 5 Shroud. 8-3 Notes:* pressure rating designated is maximum water working pressure and is based on the 350 psi allowable rating of 24" and smaller flanges in C111 and the250 psi maximum rating of other sizes of C110 or C115 flanges. Contact American on higher pressure or temperature requirements.

8 **Bolt torque applicable only to Flanged joints with Toruseal gaskets. The 64" Toruseal gasket contains an additional torus or bead to accommodate bolting a 64" C115 or C153 flange to a standard 66" steel flange faces and faced pipe ends thoroughly prior to installation. Do not use joint or gasket compounds withToruseal gas-kets (assemble joints dry).For use with standard flange bolts. Holes match AWWA C110, C111, and C115 flange drilling. They also match certain flange drilling classes of AWWAC207 and ANSI and gaskets may be used with steel pipe flanges in the 14"-54" sizes in some cases. Check American for details, or when connecting to any flangeconfigured differently than flanges per AWWA C110 or and NutsSize, length and number of bolts andnuts are shown in Table Nos.

9 8-3 (Details andAccessories-AWWA C110 or C115 flange)and 8-11 (Details and Accessories-flangefaced and drilled per ANSI Class 250).Bolts are specified in ANSI and nutsare specified in ANSI Bolts and nutsof low-carbon steel conforming to ASTMA307 are specified in the Appendix ofAWWA C110 and C115 for Flanged pipewhen rubber gaskets are used. Nuts of regu-lar or heavy hex design are used according tocustomer specifications. Also, per theAppendix of AWWA C110 and C115, high-strength bolts should not be used when agray iron flange is involved in the FlangeGasketThe American Toruseal flange gasketis available forimproved joint perfor-mance. It is vastly supe-rior to conventionalfull-face or ring recommended for all normal waterand sewer service, it especially must be used indemanding services such as very large diame-ter Flanged piping, specially designed long-span installations ( spans involving 2 or 3 lengths of pipe ) or with any undergroundflanges* that could be subjected to undesirablebeam loading.

10 Toruseal gaskets are normallyfurnished of high-quality black, molded SBRrubber with required properties perANSI/AWWA C111 StandardToruseal SBR rubber gaskets are ANSI/NSFS tandard 61 certified for contact with type rubber is available on specialorder. American Toruseal gaskets meet thedescription of specially designed gaskets shown in the appendices of AWWA C110,C111, and C115, and special gaskets shownin the body of AWWA Toruseal gaskets are rec-ommended for AWWA standard flangedjoints in normal water and sewage ANSI standard specifies theinside of 3 -12 non-metallic full-face andring gaskets to be greater (the same asstandard steel pipe outside diameters) thannominal. Any flat gaskets used for ductileiron Flanged pipe must have nominal inside diameters as shown in the appendixof ANSI/AWWA C115 , not thelarger inside diameters per ANSI larger gaskets per ANSI not recommended by No.