Large diameter pipes are cylindrical conduits with a significant diameter, designed for transporting fluids, gases, or solids in various industries. These pipes, typically exceeding conventional sizes, are crucial for applications such as oil and gas transportation, water distribution, and sewage systems. They are manufactured from durable materials like steel or concrete, which provide strength and reliability to withstand the pressures and demands of heavy-duty industrial processes.
There are two prominent types of large diameter pipes – SSAW pipes and LSAW pipes, both playing vital roles in diverse industries. They exemplify advanced welding techniques, ensuring durability and efficiency in the conveyance of fluids and materials across a range of industrial settings.
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SSAW pipes, or Spiral Submerged Arc Welded pipes, are large-diameter steel pipes formed by welding a spiral seam along a steel coil, creating a strong and reliable structure. Designed for infrastructure-scale projects, they handle large flows and heavy pressure in applications such as bridges, water systems, and drainage. Their durable construction ensures long-lasting performance for mega-projects and demanding environments.
LSAW pipes, or Longitudinal Submerged Arc Welded pipes, are large-diameter steel pipes formed by welding a straight seam along a molded steel plate or coil. Designed for infrastructure-scale projects, they handle large flows and heavy pressure in applications such as bridges, water systems, and drainage. Their high-strength construction ensures long-lasting durability for mega-projects and demanding industrial applications.
Large diameter pipes are available in SSAW and LSAW configurations — 24″ to 64″ OD, wall thicknesses 3/16″ to 1-13/32″ — to ASTM A-139, A-252, and AWWA C200. Download the 2026 Product Handbook for the full OD-wall thickness matrix.
Access OD, wall thickness, weight per metre, and applicable ASTM/AWWA standard data for all SSAW and LSAW large diameter pipe configurations — from 24" to 64" OD across multiple wall thicknesses.
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Common Questions
Large diameter pipes are typically those with a diameter of more than 16 inches (406 mm). These are commonly used for water, oil, gas, and industrial pipeline systems that require high flow capacity.
Large diameter pipes are commonly used for water supply and drainage systems, oil and gas transmission, sewer networks, and industrial pipelines, where high flow capacity and efficient transport over long distances are required.
Large diameter steel pipes are highly strong and durable, designed to handle heavy loads, high pressure, and harsh environments. Their robust structure ensures long service life, resistance to stress, and reliable performance in demanding industrial and infrastructure applications.
Specifying SSAW or LSAW pipes for water mains, piling, drainage, or marine infrastructure? Our Sales Team can confirm OD, wall thickness, ASTM/AWWA standard, pricing, and delivery across the Philippines — fast and with no runaround.
