AMERICAN furnishes 4" through 64" ductile iron flanged pipe with threaded or welded flanges in accordance with the guidance of AWWA C115. The maximum length of flanged pipe is up to 20&#;0", depending on diameter. Flanges generally are threaded or welded as per C115. Any configurations requiring static castings are in accordance with applicable requirements of AWWA C110.

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Flanged pipe is generally specified for aboveground service for water, wastewater, air, oil and other liquids where rigid, restrained joints are needed. It is widely used in water and wastewater treatment plants, in industrial piping systems, and for other interior piping as well as for exterior applications such as bridge and other elevated crossings.

Pipe may be furnished with one end flanged and the other with virtually any AMERICAN joint as may be required.

The underground use of the flanged joint is generally not recommended due to the rigidity of the joint and as noted in appendices of appropriate ANSI/AWWA standards.

Flanged pipe is rated for a maximum working pressure of at least 250 psi. If higher ratings are needed, consult AMERICAN and we will evaluate the application and use of Toruseal gaskets. AWWA C110 and C115 flanges are flat-faced. ANSI B16.1 Class 250 flanges are also rated for maximum water working pressure of at least 250 psi. The flanges faced and drilled per ANSI B16.1 Class 250 flanges are raised-face and have a different bolt circle. Be careful when specifying or ordering those. You are invited to consult AMERICAN.

Coatings and Linings

Since most flanged pipe is in an exposed environment, the usual outside shop coating is Wasser FerroClad primer. Most all AMERICAN linings, including cement per AWWA C104, are available for flanged pipe. A rust-preventive coating is applied to the machined faces of the flanges, and this coating may be removed prior to installation.

Pipe Barrel and Flanges

Ductile iron pipe barrels conform to the requirements of AWWA C151. All flanges furnished by AMERICAN are ductile iron and in accordance with AWWA C115. AMERICAN recommends only ductile iron flanges for strength and safety, although AWWA C115 currently allows both ductile iron and gray iron flanges.

Pipe barrels and flanges have tapered pipe threads (NPT) in accordance with ANSI B2.1 adapted to the ductile iron pipe outside diameters. The flange is threaded onto the pipe and machine-tightened until the pipe barrel extends through the face of the flange; it is then machined to give a flush finish of the barrel and flange and to ensure that the flange face is perpendicular to the axis of the pipe. The flange is designed so that a shroud substantially covers the working threads of the pipe for thread protection. Prior to assembly of the flange on the pipe, a commercial-grade thread compound is applied to the threads.

AMERICAN flanged pipe is shop-fabricated, and threading at the job site is not recommended. Flanges furnished on pipe are not interchangeable in the field and generally cannot be removed after fabrication without damage. If installation conditions require assembly of the flange, it may be factory-assembled to a &#;hand-tight&#; condition. This permits removal and re-assembly in the field, at which time suitable thread compound must be used. &#;Hand-tight&#; flanges should be limited to 16" and smaller sizes because of the difficulty in properly tightening larger flanges.

Joint Material

With the exception of AMERICAN Toruseal gaskets recommended for superior performance, flanged joint materials are not normally furnished. See AMERICAN Toruseal Gaskets.

AMERICAN Toruseal Flange Gasket

The AMERICAN Toruseal flange gasket is available for improved joint performance. It is vastly superior to conventional full-face or ring gaskets. Although recommended for all normal water and sewer service, it especially must be used in demanding services such as very large diameter flanged piping, specially designed long-span installations, or with any underground flanges that could be subjected to undesirable beam loading. Toruseal gaskets are normally furnished of high-quality molded black SBR rubber with required properties per ANSI/AWWA C111/A21.11. Standard Toruseal gaskets are ANSI/NSF Standard 61 certified for contact with potable water. Other type rubber is available on special order.

Since flanged bolts are not generally furnished by AMERICAN, the following is given for information only.

Bolts and Nuts

See Bolts, Nuts and Studs for size, length and number of bolts and nuts. Bolts are specified in ANSI B18.2.1, and nuts are specified in ANSI B18.2.2. Bolts and nuts of low-carbon steel conforming to ASTM A307 are specified in the Appendix of AWWA C110 and C115 for flanged pipe when rubber gaskets are used. Nuts of regular or heavy hex design are used according to customer specifications. Also, per the Appendix of AWWA C110 and C115, high-strength bolts should not be used when a gray iron flange is involved in the connection.

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Steel and Ductile iron Flanges !!

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Steel and Ductile iron Flanges !!

Steel and Ductile iron Flanges !!

sowhatso

(Mechanical)

(OP)

14 Apr 09 03:52

Can we weld a ductile iron flange or cast iron flange with steel pipe , and can we weld a steel flange with dutile iron pipe , to be more specifically :

Can we weld :

1. ANSI/AWWA C110/A21.10 Ductile iron flange with Steel pipe

2.  ANSI B16.1 Cast iron raised face Class 250 , Class A  Flange  with welded steel pipe .

3. ANSI B16.5 RF Steel Class 300 flange with ductle iron pipe.

Thanks in advance for your help.
 
  

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RE: Steel and Ductile iron Flanges !!

MJCronin

(Mechanical)

15 Apr 09 13:47

-MJC

Who is going to take the first shot at this..???-MJC

   

RE: Steel and Ductile iron Flanges !!

metengr

(Materials)

15 Apr 09 15:14

Quote:

Can we weld :

1. ANSI/AWWA C110/A21.10 Ductile iron flange with Steel pipe

Yes

Quote:

2.  ANSI B16.1 Cast iron raised face Class 250 , Class A  Flange  with welded steel pipe .

I would not recommend it.

Quote:

3. ANSI B16.5 RF Steel Class 300 flange with ductle iron pipe.

Yes
 

YesI would not recommend it.Yes

RE: Steel and Ductile iron Flanges !!

ApC2Kp

(Mechanical)

15 Apr 09 17:57

There are fabricators that do welding of steel or ductile iron to the ductile iron pipe barrels for waterworks and gas piping applications,

  www.napf.org

The ASME B31.1 Power piping and B31.3 Process piping codes do not allow welding of ductile iron.   Their typical piping applications are higher temperature and pressures.  The ductile iron welding might be more like brazing with a result of a less corrosion resistant joint.  The mechanical strength of a welded ductile iron joint might also need to be evaluated.    

The welding procedure for steel + ductile iron would be much different than common pre-qualified carbon steel weld procedure.  There are a few cast iron weld procedures for repair of large cast iron machine components, but these usually require pre-heat of entire cast iron part to near red hot temperature to minimize cooling cracks of CI welds.  

sowhatso,There are fabricators that do welding of steel or ductile iron to the ductile iron pipe barrels for waterworks and gas piping applications,The ASME B31.1 Power piping and B31.3 Process piping codes do not allow welding of ductile iron. Their typical piping applications are higher temperature and pressures. The ductile iron welding might be more like brazing with a result of a less corrosion resistant joint. The mechanical strength of a welded ductile iron joint might also need to be evaluated.The welding procedure for steel + ductile iron would be much different than common pre-qualified carbon steel weld procedure. There are a few cast iron weld procedures for repair of large cast iron machine components, but these usually require pre-heat of entire cast iron part to near red hot temperature to minimize cooling cracks of CI welds.

RE: Steel and Ductile iron Flanges !!

JohnGP

(Mechanical)

15 Apr 09 20:20

I think I might lose sleep over a steel Class 300 flange welded to ductile iron pipe. But maybe I'm just a nervous person. Perhaps if I knew more about the actual application I could be reassured (but I don't need to know).

John

RE: Steel and Ductile iron Flanges !!

metengr

(Materials)

15 Apr 09 20:38

Quote:

The ASME B31.1 Power piping and B31.3 Process piping codes do not allow welding of ductile iron.   Their typical piping applications are higher temperature and pressures.

Not entirely correct as written. ASME B31.1 only excludes this for boiler external piping. Otherwise, for use in water and non-toxic systems, material and welding is permitted. See 124.5 for Ductile iron and 124.4 for Cast Gray Iron limits.

Not entirely correct as written. ASME B31.1 only excludes this for boiler external piping. Otherwise, for use in water and non-toxic systems, material and welding is permitted. See 124.5 for Ductile iron and 124.4 for Cast Gray Iron limits.

RE: Steel and Ductile iron Flanges !!

sowhatso

(Mechanical)

(OP)

16 Apr 09 05:23

Thanks for all your comments .

The actual application for the flanges is for a water transmission pipe line , the line is from ductile iron pipe. the line is reted for 350psi ,restrained push-on joints , for the connection between the ductile pipe and the piping inside the valves chambers we will use flange spigot spools, the standard flanges for the ductile pipe is ANSI/AWWA C110 / A21.10 whish is rated for 250 psi .The contrcator is proposing to use special type of ring gaskets to increase the presure rate for the flanged joints from 250 psi to 350 psi.we had a discussion to replace the type of flange to weld a flanges of higher pressure rate instead of using special type of gaskets .

This is why I asked this question !!!

I just need to know , if anyone of you has ever used special type of gaskets to increase the pressure rate of the flanged joints ???

RE: Steel and Ductile iron Flanges !!

MJCronin

(Mechanical)

16 Apr 09 11:25

Isn't it possible to configure the piping system so that the material changes (DI to CS)only at flanged joints ?

No dissimilar welding would be required ...

Wouldn't this be a better solution ??

so what...Isn't it possible to configure the piping system so that the material changes (DI to CS)only at flanged joints ?No dissimilar welding would be required ...Wouldn't this be a better solution ??

   

RE: Steel and Ductile iron Flanges !!

rconner

(Civil/Environmental)

20 Apr 09 12:52
International standards, e.g. ISO and EN 545, allow also other fabrication options, e.g. by welding or backing/slip-on configurations along with thread-fabrication etc.  While I suspect manufacturers can provide perhaps varied good-quality ductile iron fabrications capable of very high-pressure testing and service, the following is offered most in the context of AWWA thread-fabricated or integrally-cast ductile iron configurations with ductile iron flanges, of which I am most familiar.
I know at least some ductile iron manufacturers have considerable very high-pressure and other testing and experience, illustrating in general that good quality AWWA thread-fabricated pipes and joints have substantial capabilities beyond minimum standard ratings and requirements (and particularly when furnished with "specially designed gaskets" as now mentioned in the appendices of many ANSI/AWWA standards, including e.g. ANSI/AWWA C111/A21.11).  Some of this sort of non-advertised strength perhaps comes from the circumstance that AWWA ductile iron flange thicknesses in many cases were initially established with much weaker and lower moduli gray cast iron piping material, and they are now routinely furnished by many manufacturers with only the much stronger, higher moduli, and tougher ductile iron flanges but to the same dimensions.  
"Specially designed" gaskets are generally something quite beyond common highly-filled flat, sheet rubber gaskets.  An example of such a gasket is molded American "Toruseal" e.g., as depicted on page 8-3 at  
While I am aware that some pipelines e.g. of 12" (~300mm) or smaller ductile iron piping involving some ductile iron flanged joints have been field tested at even more than 850 psi (58+bars), and even in sizes up to say 48"  (~mm) at more than 435 psi (30+ bars), it may also be possible to join with or insert even higher-pressure rated welded or forged steel flanged piping items in otherwise ductile iron piping systems (though of course with other types of joints and components shown capable of handling such pressures).
  
In any case, with pressures higher than standard ratings I believe one should consult closely with the manufacturer(s) involved, as in some cases such applications might require special examination of all components involved in the pipeline, and also might be facilitated with special manufacturing, testing, or control etc. of some items.  A chain is of course only as strong as its weakest link.              
 

AWWA standards require ductile iron flanged piping to either be threaded onto pipe ends (as prescribed by ANSI/AWWA C115/A21.15 standard), or of course also allowable to be integrally cast (in the case of fittings e.g. per AWWA C110 or C153 standards etc).International standards, e.g. ISO and EN 545, allow also other fabrication options, e.g. by welding or backing/slip-on configurations along with thread-fabrication etc. While I suspect manufacturers can provide perhaps varied good-quality ductile iron fabrications capable of very high-pressure testing and service, the following is offered most in the context of AWWA thread-fabricated or integrally-cast ductile iron configurations with ductile iron flanges, of which I am most familiar.I know at least some ductile iron manufacturers have considerable very high-pressure and other testing and experience, illustrating in general that good quality AWWA thread-fabricated pipes and joints have substantial capabilities beyond minimum standard ratings and requirements (and particularly when furnished with "specially designed gaskets" as now mentioned in the appendices of many ANSI/AWWA standards, including e.g. ANSI/AWWA C111/A21.11). Some of this sort of non-advertised strength perhaps comes from the circumstance that AWWA ductile iron flange thicknesses in many cases were initially established with much weaker and lower moduli gray cast iron piping material, and they are now routinely furnished by many manufacturers with only the much stronger, higher moduli, and tougher ductile iron flanges but to the same dimensions."Specially designed" gaskets are generally something quite beyond common highly-filled flat, sheet rubber gaskets. An example of such a gasket is molded American "Toruseal" e.g., as depicted on page 8-3 at http://www.acipco.com/adip/products/Sect8.pdf . Such gaskets, along with reasonable cost and maybe some increased security vs some imperfect support or cleaning/boilting etc. of piping, also are known to tolerate some more slight cupping or deformation of flanges and piping systems (that arguably might be more pronounced in some cases with e.g. "long-span" or very high-pressure application.)While I am aware that some pipelines e.g. of 12" (~300mm) or smaller ductile iron piping involving some ductile iron flanged joints have been field tested at even more than 850 psi (58+bars), and even in sizes up to say 48" (~mm) at more than 435 psi (30+ bars), it may also be possible to join with or insert even higher-pressure rated welded or forged steel flanged piping items in otherwise ductile iron piping systems (though of course with other types of joints and components shown capable of handling such pressures).In any case, with pressures higher than standard ratings I believe one should consult closely with the manufacturer(s) involved, as in some cases such applications might require special examination of all components involved in the pipeline, and also might be facilitated with special manufacturing, testing, or control etc. of some items. A chain is of course only as strong as its weakest link.

RE: Steel and Ductile iron Flanges !!

sowhatso

(Mechanical)

(OP)

21 Apr 09 03:08

rconer ,

Thanks alot.

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