SAW pipes

The mill adopts continuous axis contorting J-C-O(J-ing, C-ing and O-ing)process with characteristics of high forming accuracy and efficiency as well as balanced distribution of forming stress.

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Category: Weld steel pipe Tag: Type of welded pipe

Description

SAW is normally operated in the automatic or mechanized mode, however, semi-automatic (hand-held) SAW guns with pressurized or gravity flux feed delivery are available.

Submerged arc welding (SAW) is a common arc welding process.

The process is normally limited to the flat or horizontal-fillet welding positions (although horizontal groove position welds have been done with a special arrangement to support the flux).

SAW pipe is made of hot rolled coiled steel by automatic submerged arc weld under normal atmospheric temperature. All the pipes are produced according to API Spec 5L, GB/T9711.1, GB/T9711.2, ASTM A252-89 standard. These pipes mainly used in petroleum and natural gas industry to transport flammable and non-flammable liquid and steel construction.

SAW means submerged arc weld ,it can be classified into LSAW and SSAW

Size range:

The pipes are supplied according to appropriate standards as well as customer specifications in a large variety of steel grades and dimensions.

O.D.:219-3200mm
W.T.:5-30mm
Lenght: 12000mm+500mm

Execute Standard:

Specific requirements on execution, tolerances, lengths, and mechanical & chemical properties are offered on request.

ASTM A252-89 WELDE AND SEAMLESS STEEL PIPE PILES
API SPEC 5L Specification for Line Pipe
GB/T9711.1 Petroleum and natural gas industries—Steel pipe for pipelines—Technical delivery conditions
SY/T5037 Spiral submerged arc welded pipe for low pressure liquid transportation

Material:

Q235-Q345,　L175-L485,　SS400,　16Mn,　L290-L360
or according to the customer’s requirements.

Pipe Coating: HDPE/ 3PE/ 3PP/ Pipe cement mortar lining

In addition to above specification, the pipes can be produced according to customer’s requirements.

Mill Test Certificate: EN 10204/3.1B
Third party inspection: SGS, BV, Lloyds etc.

Mainly 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.

SAW Welded Pipe Manufacturing Method

In single seam SAW pipe, wedding is done with the help of submerged arc welding process. In this method, a welding arc is submerged in welding flux. A Continues solid filler wire is fed from the outside. The pipe is welded first inside and then from the outside.

In the case of double seam saw pipe first two halves are joined by tack weld which is called fit-up. Double seam saw pipe is havening a two weld seam opposite to each other. Both the seams are welded from inside and outside of the pipe. In the case of high thickness pipe, multiple pass welding is done.

In a spiral saw pipe, steel plate from the de-coiler is formed in a spiral loop. This spiral loop is then welded from inside and outside of the pipe. Because of the method of manufacture, a wide variety of diameters can be produced. Spiral saw pipes are used for low-pressure services.

Whereas straight saw pipes are used for medium to high-pressure services. Spiral saw pipes are less costly compared to straight saw pipe.

Once the welding is completed heat treatment is carried out on the weld or on the full body of pipe, this depends on the thickness of pipes. Weld seams are also subjected to various non-destructive testing such as RT & UT to ensure the soundness of the weld material.

Once all NDT is completed pipes are hydro tested to ensure strength and ability to remain leak proof under pressure. In the last stage of inspection, the pipe is checked visually and dimensionally by competent inspection engineer. He will ensure that pipe is meeting the code, standard, and specification requirements. Once the Inspection engineer cleared the pipe, it will mark as per the standard requirements & send for the packaging.

Difference between ERW and SAW steel pipe

As ERW steel pipe and SAW steel pipe in the pipe during forming, welding and process is different, so that two kinds of steel pipe in the performance there are some differences.

ERW steel pipe surface quality is superior to spiral submerged arc welded pipe, ERW steel pipe surface is smooth, smooth, beautiful, SAW steel pipe internal and external weld reinforcement.

ERW steel pipe weld defect types is less than the saw steel pipe. Saw steel pipe with solvent deposited, more types of defects, in addition to volume defects, there are wire-line trap. ERW steel pipe weld defects only wire-line and straight welds, the inspection process easy to follow, and the defects in the maximum reflection at, once the lack of implicit, ultrasonic reflecting the strong, easy to detect.

ERW steel pipe related to saw steel pipe in residual stress ratio is low. Since ERW pipe deformation in the deformation process more fully, coupled subsequent sizing flat oval, elliptical vertical changes and necking, making ERW pipe residual stress becomes smaller. Physical testing showed that the same specifications, the same material ERW pipe after incision along the axis, the axial and transverse incisions smaller displacement than the spiral submerged arc welded pipe.

ERW Pipe overall performance of the same, when the pipe becomes defective, steel scrap judgment, allow welding. SAW steel pipe allowed, and pipe welding performance and overall performance is inconsistent, welding place prone to stress corrosion cracking. Experiments show that stress corrosion fatigue test ERW pipe spiral submerged arc welded pipe length than life.

Standard

Welded pipes specification and size

Product Name	Executive Standard	Dimension (mm)	Steel Code / Steel Grade
Electric-Resistance-Welded Steel Pipes	ASTM A135	42.2-114.3 x 2.11-2.63	A
Electric-Resistance-Welded Carbon Steel and Carbon-Manganese Steel Boiler and Superheater Tubes	ASTM A178	42.2-114.3 x 2.11-2.63	A, C,D
ERW and Hot-dip Galvanized Steel Pipes	ASTM A53	21.3-273 x 2.11-12.7	A, B
Pipes for Piling Usage	ASTM A252	219.1-508 x 3.6-12.7	Gr2, Gr3
Tubes for General Structural Purpose	ASTM A500	21.3-273 x 2.11-12.7	Carbon Steel
Square Pipes for General Structural Purpose	ASTM A500	25 x 25-160 x 160 x 1.2-8.0	Carbon Steel
Mechanical tubing	ASTM A513	21.3-273 x 2.11-12.7	carbon and alloy steel
Screwed and Socketed Steel Tubes	BS 1387	21.4-113.9 x 2-3.6	Carbon Steel
Scaffolding Pipes	EN 39	48.3 x 3.2-4	Carbon Steel
Carbon Steel Tubes for General Structure Purpose	JIS G3444	21.7-216.3 x 2.0-6.0	Carbon Steel
Carbon Steel Tubes for Machine Structure Purpose	JIS G3445	15-76 x 0.7-3.0	STKM11A, STKM13A
Carbon Steel Pipes for Ordinary Piping	JIS G3452	21.9-216.3 x 2.8-5.8	Carbon Steel
Carbon Steel Pipes for Pressure Service	JIS G3454	21.7-216.3 x 2.8-7.1	Carbon Steel
Carbon Steel Rigid Steel Conduits	JIS G8305	21-113.4 x 1.2-3.5	G16-G104, C19-C75, E19-E75
Carbon Steel Rectangular Pipes for General Structure	JIS G3466	16 x 16-150 x 150 x 0.7-6	Carbon Steel

Coating

Pipeline coating is the most consistent and successful solution for protecting ERW pipes from corrosion, from moisture, other harmful chemicals.

Anti-corrosion steel pipe is processed through the preservation process, which can effectively prevent or slow down the process in the transport and use of chemical or electrochemical corrosion reaction of steel pipe.

Therefore pipe anti-corrosion layer is an important barrier to prevent soil erosion. A well-known foreign scholar put forward” 3PE france protective layer”, so far, anti-corrosion methods is widely used.

Coated pipes offer high resistance to corrosion on pipes and provide many benefits such as:

1. Increased Flow Capacity – A coating on pipes helps provide a smoother surface thus improving gas and liquid flow within pipes.

2. Reduced Cost – The pipeline coating increases the pipes durability so they can be deployed with minimum maintenance cost even in the harshest environments.

3. Lower energy usage – Various studies have shown that pipelines that are internally coated use less energy for pumping and compression of products through pipes. This helps in increased saving over time.

4. Clean delivery of products – The inhibitors used for the protection products can also be minimized by the use of coated pipes for delivery of products.

Thus, coating of pipelines can help you in reducing your maintenance cost and at the same time providing a corrosion free reliable protection.

Basic functions of erw pipe coating

making the surface of ERW steel pipes free from electrochemical corrosion of the soil medium, the basic physics of bacterial corrosion protection.
resisting the move of the soil medium creep stress, static stress and abrasion force method and structure of the basic machinery protection.

The basic principles of urban gas pipeline coating selection:

good insulating and mechanical properties;
good resistance to cathodic disbondment performance;
good resistance to water, gas permeability;
good chemical resistance soaking performance and anti-aging properties;
resistance to low temperature and high temperature performance;
easy mending and mending;
at reasonable prices.

Types of coating:

Coating Specifications

2.1.External Coating

2.1.1 External Epoxy Coating

API RP 5L2 Recommended Practice for Internal Coating of Line Pipe for Non-Corrosive Gas Transmission Service.
CAN/CSA-Z245.20 Standard for External Fusion Bond Epoxy Coating for Steel Pipe
AS 3862 Standard Specification for External Fusion-Bonded Epoxy Coating for Steel Pipes
AWWA C210 Standard for Liquid-Epoxy Coating Systems for the Interior and Exterior of Steel Water Pipelines
AWWA C213 Standard for Fusion Bonded Epoxy Coating for the Interior and Exterior of Steel Water Pipelines.
DEP 31.40.30.32-Gen TECHNICAL SPECIFICATION FOR EXTERNAL FUSION-BONDED EPOXY POWDER COATINGFOR LINE PIPE
NFA 49-710 Standard Specification for External FBE layered Coating
ISO 21809-2:2007, Petroleum and natural gas industries-External coatings for buried or submerged pipelines used in pipeline transportation systems-Part 2:
Fusion-bonded epoxy coatings
NACE RP0394 – National Association of Corrosion Engineers Standard Recommended Practice, Application, Performance, and Quality Control of Plant Applied, Fusion Bonded Epoxy External Pipe Coating.
NACPA 12-78 – National Association of Pipe Coating Applicators External Application Procedure for Plant Applied fusion Bonded Epoxy (FBE) to Steel Pipe.
SAES-H-002 Internal and External Coatings for Steel Pipelines and Piping
09-SAMSS-089 Shop-Applied External FBE Coating
09-SAMSS-091 Shop-Applied Internal FBE Coatings

2.1.2 Polyethylene Coating

CAN/CSA Z245.21 External Polyethylene Coating for Pipe
DIN 30670 Polyethylene Sheathing of Steel Tubes and of Steel Shaped Fittings
NFA 49-710 External Three-Layer Polyethylene Based Coating, Application by Extrusion
DNV-RP-F106 Factory Applied External Pipeline Coatings For Corrosion Control
AS/NZS 1518 External Extruded High-Density Polyethylene Coating System for Pipes
ISO 21809-1 Petroleum and natural gas industries — External coatings for buried or submerged pipelines used in pipeline transportation systems – Part 1: Polyolefin coatings (3- layer PE and 3- layer PP)
ISO 21809-4:2009, Petroleum and natural gas industries -External coatings for buried or submerged pipelines used in pipeline transportation systems-Part 4: Polyethylene Coatings (2-layer PE)
DEP 31.40.30.31-Gen. TECHNICAL SPECIFICATION FOR EXTERNAL POLYETHYLENE AND POLYPROPYLENE COATING FOR LINE PIPE
IPS-G-TP-335 Material and Construction Standard for Three Layer Polyethylene Coating System
NFA 49-710 External 3 layer Polyethylene Coating
PETROBRAS’ ET-200.03 Engineering Specification (“Piping Materials for Production and Process Facilities”) for using low density linear polyethylene in carbon steel piping, as to appendix 13 of such specification.
09-SAMSS-113 External Renovation Coating for Buried Pipelines and Piping (APCS-113)
UNI 9099-DIN 30670 Polyethylene Coating Applied by Extrusion

2.1.3 Polypropylene Coating

DIN30678 Polypropylene Sheathing of Steel Tubes and of Steel Shaped Fittings
EN 10286 Steel tubes and fittings for onshore and offshore pipelines –External three layer extruded polypropylene based coatings.
NFA 49-711 External Three-Layer Polypropylene Based Coating, Application by Extrusion
09-SAMSS-114 Shop-Applied Extruded, Three-Layer Polypropylene External Coatings for Line Pipe

2.1.4 Polyurethane Coating

AWWA C222-99: Polyurethane Coatings for the Interior and Exterior of Steel Water Pipe and Fittings
BS 5493- Polyurethane Coating
DIN 30677.2 polyurethane Insulation of the fittings
EN 10290- External Liquid Applied Polyurethane Coatings

2.1.5 Polyolefin Coating

AWWA C225-03: Fused Polyolefin Coating Systems for the Exterior of Steel Water Pipelines
AWWA C215-99: Extruded Polyolefin Coatings for the Exterior of Steel Water Pipelines
AWWA C216-00 Standard for Heat-Shrinkable Cross-Linked Polyolefin Coatings for the Exterior of Special Sections, Connections, and Fitting for the Steel Water Pipelines
AWWA C224 – 01: Two-layer Nylon-11 Based Polyamide Coating System for Interior and Exterior of Steel Water Pipe and Fittings
AWWA C225 – 03: Fused Polyolefin Coating Systems for the Exterior of Steel Water Pipelines

2.1.6 Tape Coating

ISO 21809-3:2008, Petroleum and natural gas industries-External coatings for buried or submerged pipelines used in pipeline transportation systems-Part 3: Field joint coatings
AWWA C209-00: Standard for Cold-Applied Tape Coatings for the Exterior of Special Sections, Connections, and Fittings for Steel Water Pipelines
AWWA C214-00 Standard for Tape Coating Systems for the Exterior of the Steel Water Pipelines
AWWA C217-99 Standard for Cold-Applied Petrolatum Tape and Petroleum Wax Tape Coatings for the Exterior for Special Sections, Connections, and Fittings for Buried/Submerged Steel Water Pipelines
AWWA C218-02 Standard for Coating the Exterior of Aboveground Steel Water Pipelines and Fittings
AWWA C224-01: Two-layer Nylon-11 Based Polyamide Coating System for Interior and Exterior of Steel Water Pipe and Fittings
EN 12068 – DIN 30672 STANDARD-POLYETHYLENE SELF ADHESIVE TAPES

2.1.7 Bitumen Coating

DIN 30673 Bitumen coatings and linings for steel pipes, fittings and vessels.
BS 534

2.1.8 Coal-Tar Enamel Coating

AWWA C-203 Coal-Tar Protective Coatings and Linings for Steel Water Pipelines-Enamel and Tape-Hot-Applied
AWWA C205 Cement Mortar Protective Lining and Coating for Steel Water Pipe – 4 inch (100 mm) and Larger- Shop Applied
BS 534

2.1.9 Concrete Weighted Coating

DNV-OS-F101 Submarine Pipeline System
ASTM C171 Specification for Sheet Material for Coating Concrete
BS EN 12620 Aggregates for Concrete
ISO 21809-5:2009, Petroleum and natural gas industries -External coatings for buried or submerged pipelines used in pipeline transportation systems – Part

5:External concrete coating.

ASTM C42 Standard Test Method for Obtaining and Testing Drilled Cores and Sawed Beams of Concrete
ASTM C642 Standard Test Method for Specific Gravity, Absorption and Voids in Hardened Concrete
ASTM C87 Standard Test Method for Effect of Impurities in Fine Aggregate on Strength of Mortar BS 1881 Methods of Testing Concrete
BS 3148 Methods of Test for Water for Making Concrete
BS 4482 Hard Drawn Mild Steel Wire for the Reinforcement of Concrete
BS 4483 Specification for Steel Fabric for the Reinforcement of Concrete
BS 4449 Specification for Carbon Steel Bars for Reinforcement of Concrete
ISO 4012 Determination of Compressive Strength of Test Specimen

2.1.10 Marine Coating

EN ISO 12944:1998 – Paints & Varnishes – Corrosion Protection of Steel Structures by protective paint system (parts 1 – 8)
ISO 20340:2009 Paints and varnishes – Performance requirements for protective paint systems for offshore and related structures
ISO 15741 Paints and varnishes-Friction-reduction coatings for the interior of on- and offshore pipelines for non-corrosive gases

2.1.11 Other specification

British Gas BGC/PS/CM1,
BGC/PWS/CM2
GAZ de France R 09
NACE RP 0181
NF A 49-706
TS 5140
TS 5139

2.2. Lining

2.2.1 Epoxy Lining

AWWA C210: Liquid-Epoxy Coating Systems for the Interior and Exterior of Steel Water Pipelines
API RP512 or NFA 49-709 Internal can be epoxy 80 microns
TS EN 10289
NFA 49708 Recommended Practice for Internal Coating of Line Pipe

2.2.2 Bitumen Lining

DIN 30673 Bitumen coatings and linings for steel pipes, fittings and vessels
UNI-ISO 5256/87 STANDARD-BITUMEN COATING
BS 534

2.2.3 Cement Mortar Lining

AS/NZS 1516 Cement Mortar Lining of Pipelines In Situ
AWWA C203-02: Coal-Tar Protective Coatings & Linings for Steel Water Pipelines, Enamel & Tape, Hot-pap. (Incl. add. C203a-99)
AWWA C205-00: Cement-Mortar Protective Lining and Coating for Steel Water Pipe- 4 In. (100 mm) and Larger-Shop application
AWWA C602 Standard for Cement-Mortar Lining of Water Pipelines – 4 inch (100 mm) and Larger – In Place
BS 534

2.2.4 Shop Cement Lined Piping

AWWA C205,C104,C602
DIN 2614
British Standard BS 534
British Petroleum GS 106-1
Shell DEP 30.48.30.31-Gen.
Saudi Aramco 01-SAMSS-005
KNPC ENG STD 87C1
API RP 10E

Pipe Coating Products

Fusion Bonded Epoxy – Fusion Bond Epoxy is a powder epoxy thermosetting coating applied for anticorrosion protection to steel pipelines. The pipe is first blast cleaned and heated. Then epoxy powder is spray applied by electrostatic guns to melt and form a uniform layer that hardens within a minute from application. Utilizing industry accepted materials supplied by manufacturers such as 3M, DuPont, and Valspar, the facility can apply FBE in a wide range of thickness to cost effectively meet any project specifications.
Fusion Bonded Epoxy with Abrasion Resistance Overcoating (FBE/ARO) – Utilizing two completely separate powder systems, the facility can produce FBE with an ARO at unprecedented processing speeds using industry accepted materials such as 3M 6352, DuPont 7-2610, and Lilly 2040.
Fusion Bonded Epoxy with High Temperature Resistant Overcoating – Utilizing two completely separate powder systems, the facility can produce FBE with a high operating temperature resistant overcoating such as DuPont’s Nap-Gard Gold and 3M’s 6258.
Fusion Bonded Epoxy with Zap-Wrap Overcoating – The facility is capable of processing line pipe with connections and of applying the Zap-Wrap abrasion resistance overcoating to the ends of each pipe.

Three Layer Polyethylene (3LPE)

To improve anticorrosion performance and adhesion, an additional layer of epoxy primer is sprayed onto pipe surfaces prior to the adhesive layer and Polyethylene top layer application. Three Layer Polyethylene is suitable for service temperatures from 60°C to 80°C (85°C peaks). Typical coating thickness is from 1-2 mm to 3-5 mm.

Three Layer Polypropylene (3LPP)

If a wider service temperature range and high stiffness is required, adhesive and top layers, applied over primer layer, are based on polypropylene instead of polyethylene. Three Layer Polypropylene is suitable for service temperatures up to 135 °C (140°C peaks). Typical coating thickness is from 1-2 mm to 3-5 mm.

Three Layer Polypropylene and Polyethylene

Three Layer applications involve a thermoplastic coating applied to steel pipelines as a form of anticorrosion protection. This mechanical resistance is appropriate when the risk of particularly severe coating damages exist. The Three Layer process involved several steps. First, the pipe surface is blast cleaned to remove any external residue from the mill or storage. It is then heated and sprayed with a Fusion Bond Epoxy (FBE) primer followed by the application of an adhesive copolymer and polyolefin polymers that are wrap extruded, one over the other.

Field applied products

3M: SK 134, SK6233, SK6352 Toughkote, SK 314, SK 323, SK 206N, SK 226N, SK 6251 DualKote SK-6171, SK 206P, SK226P,
3M Internal Coatings: Coupon EP2306HP
DuPont: 7-2500, 7-2501, 7-2502, 7-2508, 7-2514, 7-2803, 7-2504 Nap Gard Gold 7-2504, Nap Rock: 7-2610, 7-2617 FBE Powders
DuPont: Repair Kits; 7-1631, 7-1677, 7-1862, 7-1851
DuPont Internal Coatings: 7-0008, 7-0010, 7-0014, 7-0009SGR, 7-0009LGR, 7-2530, 7-2534, 7-2509
Akzo Nobel: FBE – Fusion Bond Epoxy
Internline 876 Seal Coat
Hampel: 85448,97840
Denso: 7200, 7900 High Service Temperature Coatings
Internal Liquid Epoxy: Powercrete Superflow

Delivery

FAQs

Advantage of ERW pipe

The alloy content of the coil is often lower than similar grades of steel plate, improving the weldability of the spiral welded pipe. Due to the rolling direction of spiral welded pipe coil is not perpendicular to the pipe axis direction, the crack resistance of the spiral welded pipe materials.

Inquiry

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FAQ

Q: How long is your delivery time?
A: The delivery time of customized products is generally 25 35 days, and non customized products are generally shipped within 24 hours after payment.

Q: Do you provide samples? Is it free?
A: If the value of the sample is low, we will provide it for free, but the freight needs to be paid by the customer. But for some high value samples, we need to charge a fee.

Q: What are your payment terms?
A: T/T 30% as the deposit,The balance payment is paid in full before shipment

Q: What is the packaging and transportation form?
A: Non steaming wooden box and iron frame packaging. Special packaging is available according to customer needs. The transportation is mainly by sea.

Q: What is your minimum order quantity?
A: There is no minimum order quantity requirement. Customized products are tailor made according to the drawings provided by the customer.