Electric resistance welding (ERW) pipes are generally used in various businesses because of their expense adequacy, strength, and protection from erosion. Finding the sizes that are available is one of the most important aspects of selecting the appropriate ERW stirred pipe for a given application. Pipe sizes are consistently portrayed by three essential limits: the nominal pipe size (NPS), wall thickness, and length. This article will dive into these limits, researching the extent of sizes available for ERW mixed pipes and the standards that regulate them.
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Nominal Pipe Diameter NPS:
The Nominal Pipe Size, generally truncated as NPS, is a standard mathematical assignment framework used to indicate the size of lines. It's critical to take note of that NPS is definitely not an immediate estimation of the line's genuine aspects. All things considered, it addresses an estimated inward measurement of the line, communicated in inches. This framework was created to give a normalized strategy to indicating pipe sizes across various makers and applications.
The origins of NPS can be found in the early days of pipe manufacturing, when nominal inner diameter was commonly used. Notwithstanding, as assembling processes advanced and wall thicknesses changed, the genuine internal breadth started to veer off from the ostensible size. Despite this, the NPS designation was still used because it was consistent and made it easy to refer to.
For ERW electrifies pipes, NPS measures regularly range from NPS 1/8 (which is around 0.405 inches or 10.3 mm in external width) to NPS 24 (which has an external breadth of around 24 inches or 610 mm). It's vital to comprehend that the NPS number doesn't straightforwardly relate to the genuine estimations of the line. An NPS 2 pipe, for instance, doesn't exactly have a 2-inch inner or outer diameter. The actual dimensions are determined by the schedule of the pipe, which we will discuss in greater depth when we talk about wall thickness.
Various standards, such as ASME B36.10M for welded and seamless wrought steel pipe, define the relationship between NPS and actual pipe dimensions. These principles furnish tables that associate NPS with external measurement, wall thickness, and different aspects for various line plans.
At times, especially for bigger sizes, the NPS might adjust intimately with the external breadth of the line. For instance, the outer diameter of NPS 14 and larger sizes frequently approximates the NPS number in inches. However, this is not always the case, and accurate dimensions should always be determined by referring to standardized tables or manufacturer specifications.
Wall thickness:
The wall thickness of ERW galvanized pipes is a critical factor that affects the pipe's strength, weight, and pressure-bearing capacity. It's typically measured in inches or millimeters and is closely related to the concept of pipe schedule.
Pipe schedule is a standard set of numbers that defines the wall thickness for each NPS. The most common schedules for ERW galvanized pipes are Schedule 40 and Schedule 80, although other schedules exist for specific applications. The higher the schedule number, the thicker the pipe wall for a given NPS.
For example, an NPS 2 pipe in Schedule 40 has a wall thickness of 0.154 inches (3.91 mm), while the same NPS 2 pipe in Schedule 80 has a thicker wall at 0.218 inches (5.54 mm). This difference in wall thickness affects the pipe's pressure rating, weight, and internal diameter.
The relationship between NPS, schedule, and wall thickness is defined in standards such as ASME B36.10M for welded and seamless wrought steel pipe. These standards provide comprehensive tables that specify the exact wall thickness for each combination of NPS and schedule.
It's important to note that as the NPS increases, the wall thickness doesn't necessarily increase proportionally. The wall thickness is carefully calculated to provide the necessary strength and pressure resistance for each size while optimizing material usage.
For ERW galvanized pipes, the most commonly used wall thicknesses range from about 0.068 inches (1.73 mm) for smaller pipes to over 0.5 inches (12.7 mm) for larger sizes. However, the exact range can vary depending on the manufacturer and the specific standards they follow.
Size range:
The size range for ERW galvanized pipes is quite extensive, catering to a wide variety of applications across different industries. The available sizes can vary based on manufacturer capabilities and the specific standards they adhere to. However, there are general ranges that are commonly found in the market.
Typically, ERW galvanized pipes are available in NPS sizes ranging from NPS 1/8 to NPS 24. This translates to outer diameters from approximately 0.405 inches (10.3 mm) for NPS 1/8 to 24 inches (610 mm) for NPS 24. However, it's important to note that not all manufacturers produce the entire range of sizes, and availability can vary.
Here's a general overview of the common size ranges:
- Small diameter pipes: NPS 1/8 to NPS 2 (outer diameter approximately 0.405 inches to 2.375 inches)
- Medium diameter pipes: NPS 2-1/2 to NPS 8 (outer diameter approximately 2.875 inches to 8.625 inches)
- Large diameter pipes: NPS 10 to NPS 24 (outer diameter approximately 10.75 inches to 24 inches)
Each of these size ranges has its own common applications. For example, smaller diameter pipes are often used in residential plumbing and light industrial applications, while larger diameter pipes are more commonly found in industrial process lines, water mains, and structural applications.
The available lengths of ERW galvanized pipes can also vary. Standard lengths are typically 20 feet (6 meters) or 21 feet (6.4 meters), but other lengths may be available upon request. Some manufacturers offer double random lengths of approximately 40 feet (12 meters) for certain sizes.
It's important to note that the actual size range available can vary based on the specific standard being followed. For example:
- ASTM A53, which is widely used in North America, covers NPS 1/8 to NPS 26 for Type E (ERW) pipes.
- API 5L, commonly used in the oil and gas industry, covers sizes from NPS 1/8 to NPS 80 for ERW pipes, although sizes above NPS 24 are less common.
- EN 10255, a European standard, covers sizes from DN 8 (approximately NPS 1/4) to DN 150 (approximately NPS 6).
When selecting ERW galvanized pipes, it's crucial to consider not just the nominal size, but also the specific dimensions, including outer diameter, wall thickness, and length. These factors will determine the pipe's suitability for the intended application, its pressure rating, and its compatibility with fittings and other system components.
It's also worth noting that while ERW technology can theoretically produce pipes of even larger diameters, practical limitations in the galvanizing process often limit the maximum size of galvanized ERW pipes. For very large diameter applications, other pipe types or coating methods may be more suitable.
ERW galvanized steel pipe tube factories:
When it comes to sourcing ERW galvanized steel pipes, there are numerous manufacturers worldwide, with a significant concentration in countries with large steel industries. One such manufacturer is the Longma Group, which produces ERW galvanized pipes that comply with several international standards, including API 5L, ASTM A53, EN10210, and AS/NZS 1163.
The Longma Group's adherence to these diverse standards demonstrates their commitment to producing pipes that meet global quality requirements. API 5L is widely used in the oil and gas industry, ASTM A53 is a general specification for pipe used in mechanical and pressure applications, EN10210 is a European standard for hot finished structural hollow sections, and AS/NZS 1163 is an Australian and New Zealand standard for structural steel hollow sections.
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