The chemical composition of steel shall be as given in Table 2. Tubes shall be supplied in anyone of the conditions specified in Table 3. 19.1 This section of the standard covers three grades of electric resistance welded/high frequency induction welded steel tubes, designated as ERW-1, ERW-2 and ERW-3. 19.1.
GI Pipe is “Galvanized Iron” Pipe. Material ms is mild steel and gi is galvanized steel that has been hot dipped . These days the pipe will likely be made from steel rather than iron. Mild steel pipe refers to the content of less than 0.25% carbon steel because of its low strength, low hardness and soft.
Seamless pipe is manufactured by extruding the metal to the desired length; therefore ERW pipe have a welded joint in its cross-section, while seamless pipe does not have any joint in its cross-section through-out its length.
ERW pipe manufacturing process includes HFW. ERW have low, medium, high frequency welding processes, and HFW is especially for high-frequency electric resistance welding. The differences between ERW and HFW steel pipe, is EFW is a type of ERW process for ordinary and thin-wall thickness steel pipes.
The easiest way to identify whether steel pipe you purchased is seamless or ERW has simply checked the stencil on the surface of the pipe. 1) Type S means seamless. 2) Type F is furnace but welded, 3) Type E is Electrical resist welded.
Performance and Usage. Seamless steel pipe has better pressure capacity, strength is higher than ERW welded steel pipe. So it is widely applied in high pressure equipment, and thermal, boiler industries. Generally the welding seam of the welded steel pipe is the weak point, the quality affect overall performance.
Main Plumbing Pipes
- Copper Pipes.
- Galvanized Steel Pipes.
- Polyvinyl Chloride Pipes.
- Chlorinated Polyvinyl Chloride.
- Cross-Linked Polyethylene Pipes.
IS : 3589 - 2001 : Steel pipes for water and sewage Gr: ERW - Fe 410 : 5.0 DIMENSIONS AND TOLERANCES : 5.1 Sizes: Pipes shall be supplied to the dimensions specified on BHEL order. BHEL order shall clearly state the outside diameter and well thickness of the pipe.
Black steel pipe is not galvanized, so it is safe to weld.
Working Differences. Construction is the main difference between the two products. Black iron pipes will have seams that allow the user to connect them easily to other pieces of pipe using connector valves. Steel pipe is more often used in industrial applications and it needs to be welded.
These welded steel, schedule 40 pipes feature NPT threads at both ends. Black steel pipe is interchangeable with black cast-iron or black malleable iron pipe. Galvanized pipe is zinc-coated to resist rust and corrosion. Use in low-pressure plumbing applications including air, water, oil, natural gas, and steam.
Black iron pipe used to be found in water lines, but has been much more popular for gas since the advent of copper, CPVC, and PEX. Despite its name, black iron pipe is actually made of a low-grade "mild steel" compound. This gives it much better corrosion resistance than traditional cast iron piping.
According to pvcfittingonline.com, schedule 40 1.5 inch diameter PVC
pipe can take 954 pounds of tensile strength, and schedule 80 1.5 inch diameter PVC
pipe can take 1225 pounds of tensile strength.
How much weight can a pipe support?
| Horizontal Span Length (ft.) | 1/2" Size | 1-1/4" Size |
|---|
| 1' | 18 lb. | 50 lb. |
| 2' | 5 lb. | 35 lb. |
| 3' | 3 lb. | 20 lb. |
| 4' | 2 lb. | 11 lb. |
Black iron pipe is used to transport natural and propane gas in residential applications. Black steel pipe is manufactured as seamless which makes it a better type for gas transportation and fire sprinkler systems since it can prevent fire better than galvanized pipe.
Piping materialsSteel, copper, brass: The most common gas piping is black steel. Galvanized steel, copper, brass or CSST (Corrugated Stainless Steel Tubing) also can be used in some areas, but some utilities specifically prohibit the use of copper. In other areas, the use of copper is widespread.
Black steel is made of steel that has not been galvanized. Its name comes from the scaly, dark-colored iron oxide coating on its surface. It's used in applications that don't require galvanized steel. The oil and petroleum industries use black steel pipe for moving large quantities of oil through remote areas.
If you have black gas or water pipes, or black piping in your bathroom, it's easy to paint it with another color that blends in with the surroundings or matches your décor. There's even a special paint called Stove Paint you can use safely for pipes that carry heat, such as hot water pipes or pipes from your oven.
Acrylonitrile butadiene styrene (ABS) — Drainage, waste and vent pipes are the usual application for this black pipe material. It's impact- and heat-resistant, making it ideal for outdoor use. Because many building codes prohibit its use, however, PVC or HDPE pipes are often used instead.
Simple answer, use PVC pipe cleaner and plenty of cloth rags. The pipe cleaner is basically acetone (don't use the purple primer!) but comes with the convenient applicator. Dissolves the black coating gunk instantly and you can wipe it away quickly with a rag, but act fast.
Black-iron pipe is OK for gas lines and for closed-loop hydronic- and steam-heat systems because oxygen isn't regularly introduced into the loop. The oxygen in water is what actually rusts the pipe. Stick to copper pipe or PEX tubing for use in your home's potable-water lines.
It is very common to see black pipe used for your natural gas line and sprinkler system lines. Since black pipe has no protective coating, it may rust easily in wet or humid environments. To stop the pipe from rusting or corroding on the outside, you should provide a layer of protection on the outside of the pipe.
There have been "black iron" pipes (actually steel pipes with the black oxide from the mill) in service underground for close to 100 years with little or no failure. Certainly there have been steel pipes with no protective coatings that have failed in one way or another with less than ten years in the ground.
Often mistaken for cast iron because of its heft and dark appearance, they make black steel pipe of mild steel. It's usually a low-grade and not galvanized. With good corrosion resistance and strength, they commonly use black pipe for natural gas and propane lines, steam lines, and fire sprinkler systems.
The metals then cool together. The alloyed combination makes the steel both more durable and more rust-resistant. Black steel is even less expensive than galvanized steel because it isn't coated or alloyed. Instead, it becomes covered in iron oxide (rust) during the manufacturing process.
Here's an overview of how to blacken steel with beeswax:
- Clean the metal thoroughly with a degreaser and remove any rust.
- Preheat an oven to 425 degrees Fahrenheit.
- Put the metal on to a metal baking sheet.
- Let the metal get hot in the oven.
- Remove the metal from the oven and take it to a ventilated area.
If you come across a black pipe in a sink, tub, or toilet drain, it's probably made from acrylonitrile butadiene styrene (ABS). “ABS is another material typically found in DWV systems, and it works in a similar fashion to PVC,” O'Brian says.
The key difference between carbon steel and black steel is that carbon steel requires galvanization because it is susceptible to corrosion whereas black steel is made from non-galvanized steel. Black steel gets its name due to the presence of a dark-coloured iron oxide coating on the surface of the steel.
Black steel pipe and galvanized pipe are made of steel, but galvanized pipe has a zinc coating while black pipe does not and therefore, galvanized pipe is more expensive and more durable. Since it has a dark color surface that is form by iron oxide during the manufacturing process, it is called black steel pipe.
