TKL News

All about G.I. & B.I. Pipes

by TKL Steel February 8, 2022

Galvanized Iron (G.I.) and Black Iron Pipes (B.I.) are metal tubes known for their ability to withstand high heat and extreme temperatures. It is commonly used as a medium to transport liquids, gas, or fine solids for structural purposes.


G.I. Pipes are covered with zinc to make the pipe more resistant to rust. The main use of G.I. Pipes are to supply water to residential homes and buildings. The zinc material in galvanized pipes can block corrosion to avoid the build-up of mineral deposits.


B.I. Pipes are uncoated and the black color is from the iron-oxide made on its surface throughout the manufacturing process. It is commonly used to transport natural gas into homes and commercial buildings. The black iron pipe is made without a seam, making it durable and safer to carry gas. It  is also utilized for fire sprinkler systems as it is more fire-resistant than galvanized pipe.



TKL offers G.I. and B.I. Pipes in various kinds such as plain end, threaded, welded, and seamless pipe in different specifications:

Thickness: LS-II, Fence Tube, Standard 40 (welded), Standard 80 (seamless)

Diameter (in): 3/8, 1/2, 3/4, 1, 1 1/4, 1 1/2, 2, 2 1/2, 3, 4, 5, 6, 8, 10, 12

Benefits of using G.I. & B.I. Pipes


Pipes are commonly used in various construction projects due to the following benefits:

1. Durability

Steel pipes have a long life span and it only requires minimal maintenance. It has the ability to resist damage and it can withstand severe weather conditions.


2. Versatility

Steel pipes are versatile as aside from being utilized in construction as scaffolding, fencing and railings, it can also be used in modern decorations to add aesthetic appeal in the structure.


3. Recyclable

Steel pipes are recyclable with less environmental impact. When a pipe reaches its maximum use, it can be melted down and converted into other steel materials.

Uses of Pipes

Pipes are versatile and it has a lot of different uses in the construction sector.  Here are some of the common applications.


1. Structural support

Pipes are used in construction as structural support as it provides additional support in the strength of the structure.


2. Pipeline for oil and gas

Black iron pipes are utilized to transport oil, gas, and other extreme utilities as it has iron oxide coating to add strength and durability.


3. Fire sprinkler and heat exchanger system

BI Pipes are utilized as the main material in the fire sprinkler and heat exchanger system due its ability to withstand high temperatures and resistance to fire.


4. Scaffolding

Pipes are utilized as support and elevation in the construction of various structures.

Are you looking for a trusted steel supplier that provides good quality steel products at competitive prices? Contact TKL Steel Corporation, the trusted steel supplier in the industry with over 35 years of experience in valuing the trust of our customers and providing good quality steel products at competitive prices. For inquiries, you may reach us at 0917 569 2087, 0923 082 9160, (02) 8588 1155 to 99, email us at, or send us a message in our official Facebook page and our friendly sales associates will assist you with your steel requirements.



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