ERW pipe is formed from strip or plate and joined with a longitudinal electric-resistance weld. The process name alone does not define suitability: the governing standard, grade, dimensions, service conditions, testing, documentation and delivery requirements still need to be specified for the order.
Specify the governing product standard
ERW pipe is produced under multiple product standards for different services. Start with the project specification or engineering requirement, then state the required grade, size range, wall thickness, supply condition and testing rather than asking for “ERW” as a complete specification.
Define dimensions and end condition
- OD or NB and wall thickness or schedule.
- Required length and dimensional tolerances.
- Plain, threaded, beveled, grooved, or other end preparation where applicable.
- Coating, galvanizing, surface condition, or marking requirements where applicable.
Keep application approval separate from availability
A product being commercially available does not mean it is technically suitable for every pressure, structural, water, fire-protection, or fabrication service. Confirm the applicable design code and project requirements before accepting an alternative standard or grade.
Put documents and inspection into the RFQ
- Required material certificate or inspection-document type.
- Hydrostatic, NDT, dimensional, marking, or supplementary test requirements.
- Buyer or third-party inspection requirements and document-release hold points.
- Delivery city, quantity, and required delivery date.