Schedule 80 galvanized steel pipe

Schedule 80 galvanized steel pipe is a heavy-duty pipe product that combines the advantages of Schedule 80's thick-walled design and galvanized anti-corrosion coating. The thicker wall enables it to withstand higher internal pressure, and the galvanized layer can effectively prevent rust and corrosion. This combination makes it very popular in industries that require high mechanical strength and long service life, such as water supply and drainage systems, chemical pipe networks, and Marine engineering, etc.

What is Schedule 80 galvanized steel pipe

Schedule 80: It refers to the wall thickness grade stipulated in the ASME B36.10/B36.19 standard. Compared with Schedule 40, Schedule 80 has a thicker wall and a higher pressure resistance capacity.

Galvanized (galvanizing) : Through hot-dip galvanizing or electro-galvanizing processes, a zinc protective layer is formed on the surface of steel pipes to prevent direct contact between the steel and air and moisture, thereby delaying corrosion.

The combination of the two: The thick-walled structure provides high strength, and the galvanized coating offers corrosion resistance, making it suitable for high-pressure, humid or corrosive environments.

Specifications and technical parameters

Schedule 80 Galvanized steel pipes are usually produced in accordance with standards such as ASTM A53, ASTM A106, and API 5L.

Common specifications

Size range: 1/2" - 24" (DN15 - DN600)
Wall thickness: Conforms to Schedule 80 Wall thickness table
Length: 6 meters (20 feet) or fixed length

Zinc coating thickness: 40-85 μm (hot-dip galvanized)

Nominal diameter NPS	Outer diameter OD	Wall thickness	Unit weight (kg/m)
1"	33.4 mm	4.55 mm	2.27
2"	60.3 mm	5.54 mm	6.18
4"	114.3 mm	8.56 mm	19.06
6"	168.3 mm	10.97 mm	36.51

Quality advantage

1. Excellent anti-corrosion ability: The zinc coating can effectively resist the erosion of moisture, oxygen, chemicals and seawater.
2. High pressure resistance: Schedule 80 galvanized steel pipes have a relatively high wall thickness and can withstand high pressure, making them suitable for transporting high-pressure fluids.
3. Long service life: Schedule 80 galvanized steel pipes have a relatively long service life, are suitable for long-term installation, and have low maintenance costs.
4. High structural strength: Schedule 80 galvanized steel pipes have a tensile strength of 60,000 psi. Besides transporting media, they can also be used as structural components.

The main application fields

Municipal water supply and drainage network: Urban water supply and drainage projects
Marine and offshore engineering: Shipbuilding, docks, offshore platforms
Chemical plant pipeline network: Resistant to corrosion by weak acid and alkali media
Agricultural irrigation: Suitable for outdoor and humid environments
Industrial structural components: support frames, frameworks, scaffolding

Schedule 80 vs Schedule 40 galvanized steel pipe

Wall thickness: Schedule 80 is thicker and has higher pressure resistance
Working pressure: Schedule 80 is suitable for high-pressure conveying
Cost: Schedule 80 is more expensive but has a longer lifespan
Application differences: Schedule 40 is suitable for low and medium pressure, while Schedule 80 is used for high pressure or heavy load conditions.

Installation precautions and maintenance suggestions

When cutting steel, it is necessary to avoid damaging the zinc coating to prevent corrosion of the steel pipe due to the damage of the zinc coating.
2. Before welding, the galvanized layer in the welding area should be ground to ensure the strength of the welding. After welding, zinc-based anti-corrosion paint should be applied to protect the welding area from corrosion.
3. Regular inspections, especially in corrosive environments such as the ocean.
4. Avoid long-term contact with strong acids.

Summary

Schedule 80 galvanized steel pipes feature both high strength and corrosion resistance, making them highly suitable for Marine engineering, chemical, industrial and municipal projects. When making a purchase, reasonably matching the specifications with the application requirements can significantly extend the service life of the pipeline and enhance its safety.

Read more : Schedule 10 vs schedule 40 steel pipe