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FAQ ON DUCTILE IRON PIPE
1.	How do I know if I have a corrosive soil environment?
2.	What is a safe pH range?
3.	Which should I specify - polyethylene field applied wrap or bonded coatings?
4.	What about salt water installations?
5.	Should polyethylene be wrapped around valves, fittings and fire hydrant buries?
6.	Should I worry about stray current in the vicinity of Ductile Iron pipe installations?
7.	How can I check possible corrosive soil conditions? How do I get ELECTROSTEEL soil survey?
8.	What Indian Standard cover Polyethylene External Protection? How is the corrosivity of soil evaluated?
9.	I am designing a new pipeline that is going to be buried in soil with a pH range of 6.4 to 7.4. What will be needed for corrosion protection of Ductile Iron pipe?
10.	Over what temperature range is polyethylene encasement effective for corrosion protection of Ductile Iron Pipe?
11.	Why is there a peen pattern on Ductile Iron Pipe?
12.	Can the Ductile Iron Pipe of K9 class be direct-tapped for service connections or do I need to use tapping saddles?
13.	Is lateral support required for bridged crossings using restrained joint pipe?
14.	How good are DI pipes in marine soils?
15.	Is it difficult to lay/ cut and take branching from DI pipe?
16.	What about salt water installations?
17.	Should I worry about stray current in the vicinity of Ductile Iron pipe installations?
18.	How can I check possible corrosive soil conditions? How do I get a DIPRA soil survey?
19.	What ANSI/AWWA Standards cover Polyethylene External Protection? How is the corrosivity of soil evaluated?
20.	Can GRP be used in overground installation?
21.	In LCA what are the appropriate deviations to be assumed by designer for various required variables inputs?
22.	Will it still be possible to make direct taps on pressure class Ductile Iron Pipe?
23.	How will pressure class Ductile Iron Pipe be affected by traffic loads in shallow cover installations?
24.	DIPRA Recommends polyethylene encasement as the most cost effective, easy-to-install, and maintenance-free method of corrosion protection for Ductile Iron Pipe in the vast majority of water works pipeline installations?
25.	For very wide trenches, can Ductile Iron Pipe experience higher loading than the prism load?
26.	Is there any difference in Calculating the required thrust restraint length for horizontal, parallel DI Pipelines utilizing the same trench as compared to a single pipeline?
27.	Over what temperature range is polyethylene encasement effective for corrosion protection of Ductile Iron Pipe?
28.	What wording can I incorporate into my specifications to ensure a qualified welder is used for field welding and filed cutting restrained joints for Ductile Iron Pipe?
29.	Pipe on supports design recommends a saddle support; however, I have seen many installations with pipe resting on rollers or even on flat surfaces (usually structural members) running perpendicular to the pipe, especially for small diameter pipelines. Is this OK?
30.	Should I be concerned with thrust restraint of valves, and if so, why?
31.	What precaution should I take when installing Ductile Iron Pipe in an area that is or might be contaminated with hydrocarbons?
32.	What is the external coating for corrosive soil?
33.	What is the external coating for the above ground pipeline?
34.	Is cathodic protection required for the Ductile Iron pipeline?
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MYTHS & FACTS
1.	Cement mortar lining of DI pipe is very thin and does not last long.
2.	Because of unequal coefficient of linear expansion of metal and cement, the bonding of the mortar lining to the pipe wall will get affected.
3.	DI K9/K7 pipes are very thin compared to CI pipes and hence will lose its strength much faster due to corrosion.
4.	Zinc coating of DI pipe does not last for very long time (just like GI pipes).
5.	The rate of corrosion is faster in case of DI pipes is higher than that of CI pipes.
6.	Providing ferrule connection on 150 / 200 mm. Diameter DI (K7 or K9) pipes is very difficult and leakages are likely to occur at the ferrule connection.
7.	DI pipes are difficult to cut.
8.	DI fittings are not widely available.
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