Carbon Steel SAW Seam Welded Pipe with A53GR.B /API 5L GR.B X42 X52

Carbon Steel SAW Welded Seam Pipes

SAW pipe is one type of seam/ welded pipe. 

SAW steel pipes is short for submerged arc welding steel pipe, it can be classified into longitudinal submerged arc welding steel pipe(LSAW steel pipe) and spiral submerged arc welding steel pipe(SSAW steel pipe).SAW is a manufacturing process using submerged arc welding of steel, this process produces high current density, which prevents the flux layer from losing heat quickly and concentrates in the welding region. Commonly used standard is API 5L.

Submerged arc weld of high quality, high production efficiency, arc and smoke a few characteristics of submerged arc welded pipe is widely used in pressure vessels, pipe manufacturing, beams, low pressure fluid, steel works.

Product Information/Product Description/Basis Information/Specification

Technology/ Technical Data Sheetsof the normal material grade

Dimension Design

OD … Outside Diameter

ID … Inside Diameter

WT … Wall Thickness

L … Length

If minimum wall thickness is required variations are allowed on the plus side only

Butt Welding Ends

ANSI / ASME B16.25-2007

Fig. 4 Weld Bevel Details for GTAW Root Pass [WT > 3mm (0,12 in.) to 10mm (0,38 in.), Inclusive]

GENERAL NOTES:

a) This detail applies for gas tungsten arc welding (GTAW) of the root pass where nominal thickness is over 3mm

b) Linear dimensions are in millimeters with inch values in parentheses.

Straightness Requirement 

tandard pipes and tubes are supplied straightened to the eye: for special applications the

permissible deviation from the straight line may be agreed between purchaser and pipe

manufacturer; the maximum permissible deviation from the straight line related

to the length of measurement L is to be indicated, e.g. 1mm/1000mm.

Eccentricity

E is half of the difference between biggest and smallest

wall thickness (WT) values in one cross section.  

In terms of mm:

However, eccentricity is expressed as a percentage of the mean wall thickness of this cross section

Mean Diameter inside and outside 

D0 is the arithmetic mean between the smallest and biggest tube diameter on any one pipes or tube

circumference. If minimum wall thickness is required variations are allowed on the plus side only

Ovality

O is the difference between biggest and smallest diameter on any one tube circumference

As a percentage of the mean diameter this is:

Ovality must not be confused with eccentricity.

SAW PIPE MANUFACTURING PROCESS

The full name of SAW steel pipe is Submerged Arc Welding Steel Pipe. It is a steel pipe manufactured by submerged arc welding process in the welding area. Submerged arc welding has the characteristics of high weld quality, high production efficiency, no arc light and little smoke and dust. Submerged arc welded steel pipes are widely used in pressure vessels, pipe fittings manufacturing, beams and columns, low pressure fluids, and steel structure engineering.

Application/Usage

Spiral welded steel pipes are widely used in Oil, Natural Gas, Water and other flammable & nonflammable liquid conveyance and distribution pipelines, steel structures for construction and other general purposes by means of their wide size range.

FAQ: Question and Answers 

Q: What is the different between ERW pipes and SAW pipes?

ERW Pipes

ERW pipes, also known as Electric Resistance Welding pipes, are made by rolling a flat sheet of steel into a tube shape. The edges are then heated and pressured together to create a weld. The resulting weld is almost seamless, making ERW pipes ideal for applications that require high precision and seamless finishes. ERW pipes are commonly used in building structures, machinery, and automotive industries.

Advantages of ERW Pipes

ERW pipes are less expensive than SAW pipes.

They are easier to fabricate and have a smoother surface finish.

ERW pipes can be used for a wide range of applications.

Disadvantages of ERW Pipes

ERW pipes have a lower capacity to withstand pressure compared to SAW pipes.

They tend to have weaker welds than SAW pipes.

ERW pipes are more susceptible to rust.

SAW Pipes

SAW pipes, also known as Submerged Arc Welding pipes, are made by heating the edges of steel plates or coils under pressure to create a weld. SAW pipes are commonly used in the oil and gas industry for transporting oil and gas from onshore and offshore drilling sites.

Advantages of SAW Pipes

SAW pipes have a higher capacity to withstand pressure compared to ERW pipes.

They have stronger welds than ERW pipes.

SAW pipes are less likely to rust.

Disadvantages of SAW Pipes

SAW pipes are more expensive than ERW pipes.

They are harder to fabricate and have a rougher surface finish.

SAW pipes are mainly used in oil and gas and could be better for other industries.

Use ERW Pipes

ERW pipes are ideal for applications that require a smooth surface finish and precise dimensions. They are also suitable for projects requiring a lower pressure capacity and budget. ERW pipes are commonly used in building structures, machinery, and automotive industries.

Use SAW Pipes

SAW pipes are ideal for projects that require a higher pressure capacity and a stronger weld. They are commonly used in oil and gas as pipelines for transporting oil and gas. If you’re working on an oil and gas project and want to protect your pipes from corrosion, consider getting a fusion-bonded epoxy coating on your SAW pipes

Q: What is the tolerance of the seamless pipes

A: Dimensions tolerance for API 5L /A106GR.B seamless pipe.

1. For outer diameters less than 2 3/8 in (60.3 mm), pipe body diameter tolerance +/-0.5 mm. Pipe end +/- 0.5 mm; Out of Roundness tolerance for pipe body is 0.9 mm (0.036 in), pipe end 0.6 mm (0.024 mm).

2. For OD equal or above 2 3/8 in (60.3) to 24 in (610 mm), (diameter tolerance) for pipe body is +/- 0.0075D,pipe end +/- 0.005D but max to +/-1.6 mm (0.063mm);

Roundness tolerance for pipe body≤0.015D, pipe end≤0.01D.

(In case agreed with manufacturer and client, more strictly tolerances could be applied)

3. For wall thickness

Below than 4 mm (0 0157 in), tolerance +0.6 (0.024 mm), -0.5 mm (0.020 in);

For API 5L seamless steel pipe thickness in 4 mm to 10 mm (0.394 in), +0. 150t, -0.125t;

For API seamless pipe thickness 10 mm to 25mm (0.984 in), +/-0.125t;

Wall thickness≥25 mm, +3.7mm or +0.1t (if larger) and -3.0 mm (0.120 in) or -0.1t (if larger).

t for thickness,

4. For straightness, max for full length, tolerance maximum 0.15% of length.

5. Straightness, max deviation for pipe end, shall be≤0.3 mm /m.

6. Length +/- 200 mm for general, +/- 25.4 mm for special.