Three welded routes
The welded lines on this site are ERW, SSAW and LSAW. ERW pipe is formed from flat steel and welded along its length by electric resistance welding. SSAW pipe is formed in a spiral and welded by a submerged arc route. LSAW pipe is welded along its length by a submerged arc route. Those three sentences describe the routes, and no further technical description is added here. A buyer who needs more than the route difference to choose should name the further points in the enquiry, for the items named.
The size ranges listed on the company About page differ between the three welded lines, and they are given on the line pages as the About page lists them: ERW at OD 1/2 to 26 inch (21.3 to 660 mm), SSAW at OD 8 to 120 inch (219.1 to 3048 mm), and LSAW at OD 14 to 64 inch (219.1 to 1626 mm). Those ranges are starting points for an enquiry, not guarantees that every size inside any range is available for any particular order. A buyer who needs a particular size should name it in outside diameter terms, together with the application and the quantities, and ask for availability and timing to be confirmed for that size.
Applications for welded pipe
Welded pipe is discussed on this site through the five application directions named on the company About page: petroleum and gas pipelines, water pipelines, construction and building, dredging projects and piling projects. The application pages describe each direction and the lines discussed for it, and neither application page assigns one welded route to one direction as a matter of fact. A pipeline job, a water job, a piling job and a construction job can each be discussed through more than one welded route, and the choice between routes for a particular job is settled by the job detail carried in the enquiry, not by any assignment on this site.
Within those directions, the homepage column names under the welded lines include piling, structure, oil and gas line, water and casing directions, and those column names are discussed on the structure pipe guide, the casing guide and the application pages in the same terms as this guide. Neither the guides nor this page turns any column name into a separate product line, and neither page states a specification for any pipe under any column name. A buyer whose job depends on a particular column direction should name it in the enquiry, together with the line and the application.
Choosing among the three welded lines
Choosing among ERW, SSAW and LSAW for a particular job starts from the job, not from the route name alone. The questions that decide the choice are the size wanted, the quantities, the destination, any date by which the pipes are needed, and any site conditions that affect handling and jointing, together with any further point the job depends on, stated in plain terms for the items named. A buyer who answers those questions in the enquiry gives the supplier a job that can be answered, while a buyer who asks only which welded route is best, without describing a job, will receive only a general answer.
Those questions should be asked together, in the same message, for the same items, together with quantity terms, timing, trade terms, payment method and documents. This site uses only the general wording that certificates are available upon request, and any document question should name the items it concerns. Splitting the questions across separate messages produces fragmented answers that are hard to check against the order, while gathering them produces a single reply that can be checked as a whole. That discipline is the same for every guide on this site.
From this guide to an enquiry
A buyer who has read this guide should next read the line page for the line favoured, then the comparison page that covers the choice between that line and its nearest neighbour, and then the enquiry checklist page, which collects the questions in order. A buyer who already knows the line can skip directly to the enquiry page, naming line, application, size, quantities, destination and date in the first message. Either path ends at the same place: an enquiry that states the job in full and asks for quantity terms, timing, trade terms, payment method and documents to be confirmed together for the items named.
No guide on this site settles an order. The catalogue narrows the choice, and the enquiry settles the order, and that division is kept on every page. A buyer who treats a guide page as an order confirmation will be disappointed, because no catalogue wording can cover quantities, timing and terms for items that have not yet been named. The enquiry pages are therefore written as the working end of the catalogue, not as an afterthought, and the guide pages point to them at every step.
Certificates available upon request. Please confirm the minimum order quantity in your inquiry before placing an order. Please confirm the lead time with the supplier before placing an order. Please confirm the trade terms and payment method before confirming an order.