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Lockseam Spiralweld Pipe

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Lockseam Spiralweld Pipe

Naylor Lockseam Spiralweld steel pipe is manufactured in strict accordance with ASTM A-211. The standards set forth in this specification are closely adhered to in every phase of production. Quality control is maintained by careful inspection throughout. This is your assurance that Naylor pipe equals or exceeds the ASTM specification in every respect.

You can view all standard sizes and wall thicknesses in our catalog.


Naylor Lockseam Spiralweld Pipe is formed from strip which is lockseamed over an internal mandrel. This process creates an accurate tubular structure before it is welded. Thus, the lockseam carries the load and relieves the weld of stresses encountered when the pipe is in service. After the lockseaming operation, the pipe is welded by completely automatic methods which insure a weld that is as strong as the parent metal. Every length of Naylor Lockseam Spiralweld Pipe is inspected and tested to the hydrostatic mill test pressures shown in the tables on the opposite page.


Naylor Lockseam Spiralweld Pipe provides greater overall strength than other steel pipe of the same wall thickness--under crushing loads, compression, collapse, and beam load at supports. This greater strength--combined with the ability of the lockseam spiralweld to absorb shock loads, stresses and strains--makes it possible for Naylor Lockseam Spiralweld Pipe to handle jobs normally requiring heavier wall pipe.


Naylor Lockseam Spiralweld Pipe incorporates a safety factor found in no other pipe. When strains are put on the line, the “heel” of the lockseam moves minutely, shortening or lengthening the pipe. Because the “heel” is in spiral form, it acts as a continuous expansion joint throughout the line. It absorbs shock loads and vibration, often destructive to a weld on a rigid structure. It cushions expansion and contraction under varying changes of pressure, temperature and ground stress. It protects both pipe and coupling medium. This factor of “give” is of major importance in pipe line construction because it assures closer conformity to topographical conditions without any sacrifice of strength.


Naylor Lockseam Spiralweld Pipe is formed under tension on a lathe-turned mandrel, which assures a perfectly-round pipe of accurate diameter. The lockseam structure provides reinforced strength to preserve the original true cylindrical form in transportation, installation and service. With ends that always match correctly and this adherence to accurate diameter, Naylor Lockseam Spiralweld Pipe reduces the time required to make connections, whether mechanically coupled or welded.


Naylor pipe is manufactured from strip or sheet steel which assures uniform wall thickness. Thickness tolerances are governed by the standards established by the American Iron and Steel Institute.


Naylor Lockseam Spiralweld Pipe can be furnished in any desired cut length up to and including 40’0”. While standard lengths are 20’0”, 30’0” or 40’0”, the piping can be cut to any required length, to tolerance of plus-or-minus 1/8”.


Naylor pioneered the development of lightweight pipe combined with standard weight ends. Thus, the advantage of light weight pipe is realized and combined with standard fittings and equipment common to industry.


Naylor Lockseam Spiralweld Pipe saves time, material and money for users. Its structure permits use on jobs normally requiring heavier-wall pipe. The relatively light weight reduces transportation, handling and installation costs as well as the initial investment. High salvage and re-use value are assured by the accurate diameter and true cylindrical form which results from the lockseam spiralweld structure.

Steel Analysis

Unless otherwise specified, Naylor Lockseam Spiralweld Pipe is furnished in basic carbon steel. For application where a high strength steel with superior abrasion and corrosion resistance is desirable, this pipe is available in stainless steel to meet specific requirements. The following are typical analyses of materials.

Basic Carbon Steel (ASTM A-570)

Carbon .08-.25
Manganese .30-.90
Phosporus .04 Max.
Sulpher .04 Max.
Silicon .10 Max.

Stainless Steel, Type 304:

Carbon .08 Max.
Manganese 2.00 Max.
Silicon 1.00 Max.
Chromium 18.00-20.00
Nickel 8.00-12.00

Stainless Steel, Type 316:

Carbon .08 Max.
Manganese 2.00 Max.
Silicon 1.00 Max.
Chromium 16.00-18.00
Nickel 10.00-14.00
Molybdenum 2.00-3.00

Extra Low Carbon (ELC) grades and other analyses are also available.