One-stop fire protection supply · Tianjin, China · est. 2018
FM / UL / CE / LPCB / VDS
FM/UL Fire Protection Seamless Steel Pipe Manufacturer
FM Approved & UL Listed fire seamless steel pipe
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FM/UL Fire Protection Seamless Steel Pipe Manufacturer

As a factory-direct seamless steel pipe manufacturer, we supply wholesale FM/UL fire protection seamless pipe, made by heating solid steel billets and perforating them into hollow tubes, then rolled or stretched with no weld seam. It withstands high pressure and temperature, and custom lengths and project branding are confirmed on the quotation.

StandardFM Approved / UL Listed
ASTMASTM A106 / A53 / A795
BS ENEN10255 / EN10216-1
EndPlain / Beveled / Grooved / Threaded
SurfaceOriginal / Black paint / Galvanized / Red paint
Length5.8m / 6m / Customized
End: Plain / Beveled / Grooved / ThreadedSurface: Original / Black paint / Galvanized / Red paintLength: 5.8m / 6m / Customized
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ERW Steel PipeASTM A53 / A795Malleable Iron FittingsBS EN 10242Pipe HangersFM / UL

Seamless fire protection steel pipe

What changes when you move from ERW to seamless on a fire line.

How seamless pipe is made

Seamless pipe starts as a solid steel billet that is heated and perforated into a hollow tube, then rolled or drawn to size. Because there is no weld seam, the wall is uniform all the way around, which is what gives it the higher pressure and temperature capability.

When to choose seamless over ERW

ERW is the default for most sprinkler mains and branch lines. Seamless is specified where the design calls for higher working pressure, higher temperature, or a service that simply will not accept a welded seam. For many fire water systems the two are interchangeable within the rated range; for the rest, seamless is the safer call.

Standards and finishes

Produced to ASTM A106 / A53 / A795 and EN 10216-1, with the same end and surface options as our ERW range: plain, beveled, grooved or threaded ends, in original, black, red or galvanized finish.

FAQ

Is seamless pipe required for all fire systems?

No. NFPA 13 allows both welded and seamless steel pipe within the rated range. Seamless is chosen for higher pressure, temperature or where a weld-free seam is specified.

What standards does it meet?

ASTM A106 / A53 / A795 and EN 10216-1, FM Approved and UL Listed for fire protection service.

What finishes are available?

Original, black paint, red paint and galvanized, with plain, beveled, grooved or threaded ends.

What are the wholesale and MOQ terms?

Wholesale orders start from 1 ton per size, and a mixed-size order toward a full container gets the better per-ton price. Seamless is priced higher than ERW for the same nominal duty, so the wholesale price list separates the two lines clearly. Samples are available on request, freight collect.

Can the pipe carry our own brand or project marking?

Yes. On a bulk order the seamless pipe can ship under your brand or a project brand, with OEM marking on the banding and the mill certificate in your name. The marking is confirmed on the quotation before production.

Spec guide: buying FM/UL seamless fire protection pipe

Seamless is specified for a reason. Compare when it earns the price over ERW, find your buying situation, and check the order before it goes to production.

OptionGood forWhere it fails
Seamless (FM / UL)High pressure or temperature; weld-free seam is a hard requirementMore expensive than ERW for identical nominal duty
ERW (FM / UL)Mains, risers and most branch lines within the rated rangeNot for designs that explicitly exclude a welded seam

Which buyer are you?

Three common ways people buy this line. Pick your lane and the quote comes back with the right questions already answered.

Distributor

Stocking seamless where the spec demands it

You carry seamless for the projects that call it out and want the mill cert and the FM/UL marks with every lot. Ask about the size-to-lot map and mixed ends.

Contractor / installer

Ordering against a weld-free spec

You buy seamless because the drawing or the client demands no weld seam. Send the standard, size, end and surface, and the quote comes back matched.

Importer / brand

Premium line under a project brand

You import seamless for high-spec projects and need the document package to prove the rating. Ask about marking and per-container cert copies.

Before you approve production

Six things to check on the quotation, the sample or the pre-shipment report. Hand this list to whoever approves the order.

  • StandardASTM A106 / A53 / A795, EN 10216-1 — stated per line.
  • Size & wallNominal size and schedule, confirmed against OD and wall.
  • EndPlain, beveled, grooved or threaded, matched to the joint type.
  • SurfaceOriginal, black, red or galvanized.
  • MarksFM / UL on the pipe and the cert copy in the shipping set.
  • InspectionMill cert included; SGS third-party inspection available per batch.
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Seamless steel pipe manufacturer — no weld seam, factory direct

01
When a seamless steel pipe manufacturer is the right call

Buyers searching for a seamless steel pipe manufacturer are usually after one thing: a weld-free seam that takes higher pressure and temperature. This pipe is drawn from a solid billet to ASTM A106 / A53 / A795 and EN 10216-1, with the FM and UL marks for fire protection service.

02
Factory line, fire rated

It comes off the same factory line as our ERW range, so a mixed order keeps the chemistry and the end preparation consistent. The fire rating is the point: where the design calls for a seamless, weld-free line, this is the part that carries it.

03
Wholesale seamless, ordered against the spec

State the standard, the size, the end and the surface and the order is set. Seamless is specified where the pressure, the temperature or the weld-free requirement says so; elsewhere the ERW line covers the system. Wholesale and mixed orders ship from the same factory line with the mill cert in the package.

Product
FMULCELPCBVDS
Factory
ISOSGSTUV

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Spec the system. We ship it together.

Send your bill of materials or drawing — we confirm spec, cert and lead time, then ship the full package.

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