Can you weld ductile iron water pipe?
Ductile Iron can be welded successfully to produce welds that have mechanical properties comparable to those of the base iron. As with any base material, the success of welding Ductile Iron depends on suitable equipment, correct procedures, qualified welders, and effective quality control procedures.
How do you weld ductile iron?
Gas welding can be used to join Ductile Iron components by the creation of either fusion or diffusion bonds. Gas fusion welding is a well established welding method for joining Ductile Iron. The process simply involves fusion of the base metal and filler rod by heat generated from an oxyacetylene flame.
How much deflection is ductile iron pipe?
Maximum deflection is 15° per joint in sizes up to and including 24-inch pipe; in sizes 30-inch and larger, maximum deflection varies from 12° to 15°.
Is cast iron and ductile iron the same?
The difference between traditional cast iron and modern-day ductile iron is the shape of the graphite. While cast iron has small flakes of graphite, ductile iron contains spherical graphite nodules. Because of the spherical shape of the graphite, ductile iron is often called spheroidal iron or nodular cast iron.
What is ductile iron made of?
Rather than being cast from iron or steel scrap, ductile iron is made primarily from the crude iron that’s produced by smelting ore in a blast furnace, commonly called ‘pig iron. ‘ Pig iron is about 90% iron with high carbon content, and its chemical properties are very stable.
Can cast iron be welded?
It is possible to weld cast iron, although it can be problematic due to the high carbon content. The welding process causes this carbon to migrate into the weld metal and/or the heat affected zone, leading to elevated brittleness/hardness. This, in turn, can lead to post weld cracking.
What is a pipe deflection?
The deflection of flexible pipe is the decrease of the vertical diameter of the pipe. (and corresponding increase in horizontal diameter) due to load on the pipe. The. deflection is expressed in terms of percentage as follows: change in diameter.
How do you calculate pipe deflection?
The equation predicts the horizontal diameter change in a flexible pipe. (2) Page 2 203 Page 2 of 5 01/92 DL = Deflection Lag Factor – Typical range 1.25 to 2.25, 1.5 is a commonly listed value (for wet conditions, these values should be doubled). WC = Vertical load per unit of pipe length (lb/Lin.in. of pipe).
When do you need ductile iron flange fittings?
When a ductile iron flanged fittings is wanted with a tapped connection, give the size of the tapping required, and designate its location by means of a letter selected from the correct view of the fittings in question.
What should I know about field welding ductile pipe?
However, unforeseen circum- stances might require field welding of retainer rings, thrust collars, etc., onto the barrels of Ductile Iron pipe. This manual is intended as a guide for field welding and cutting cement-mortar- lined and unlined Ductile Iron pipe. For welding or cutting special lined pipe, consult the pipe manufacturer.
Do you need a torch to field welding iron pipe?
Ductile Iron Pipe for many years and should be consulted on their recommendations for field welding and torch cutting their product. The Ductile Iron Pipe Research Association (DIPRA) does not support indiscriminate field welding of Ductile Iron Pipe. However, unforeseen circumstances might require field welding of retainer
When was the first ductile iron pipe made?
The first Ductile Iron pipe was cast exper- imentally in 1948. Years of metallurgical, casting, and quality control refinement followed, and in 1955 Ductile Iron pipe was introduced into the marketplace.
When a ductile iron flanged fittings is wanted with a tapped connection, give the size of the tapping required, and designate its location by means of a letter selected from the correct view of the fittings in question.
However, unforeseen circum- stances might require field welding of retainer rings, thrust collars, etc., onto the barrels of Ductile Iron pipe. This manual is intended as a guide for field welding and cutting cement-mortar- lined and unlined Ductile Iron pipe. For welding or cutting special lined pipe, consult the pipe manufacturer.
The first Ductile Iron pipe was cast exper- imentally in 1948. Years of metallurgical, casting, and quality control refinement followed, and in 1955 Ductile Iron pipe was introduced into the marketplace.
