Reliable Pipes & Tubes Ltd.

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Reliable Pipes & Tubes Ltd.
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Reliable Pipes & Tubes Ltd.
Reliable Pipes & Tubes Ltd.
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Reliable Pipes & Tubes Ltd.
Home » Manufacturing Process

Manufacturing Process

Reliable Pipes & Tubes Ltd. started its manufacturing unit a decade ago for STAINLESS STEEL ERW PIPES & TUBES with production ranging from 1/4" NB to 8"NB manufactured on fully automated tube mills of TIG welding without any addition of filler metal (A 312). Our products are in close contact with the manufacturer having the manufacturing facility from 10" NB to 24" NB with the addition of filler wire.(A 358).

We are doing export in U.A.E, Iran, Iraq, Kuwait, Saudi Arabia, Oman, Singapore, Malaysia, Vietnam, Indoanesia, Nigeria, Tanzania, Brazil, Columbia, Ecuador, Germany, France, Belgium, United Kingdom, Berlin, Qatar ,Netherlands , China, Japan, Korea, Dubai, Abudhabi, Jebelali.

Manufacturing Process

Material TP 304, 304H, 304L, 304LN, 316, 316H, 316L, 316LN, 316Ti, 309, 310, 317L, 321, 347, 409, 410, 420, 430, 446, 202 Etc.
Standard ASTM A - 270, 249, 312, 269, 213, 268, 358
Construction ERW - EFW - EFSW
Schedule S 5, S 10, S 20, S 40, S 60, S XS, S 80, S 100, S 120, S 140, S 160, S XXS
Pipe Type Beveled End (BW), Plain End Pipe (PE)


Technical Data

S.S Schedule Piping to ASTM A-312 (ERW)



Introduction & Scope
This covers straight seam welded (without the addition of filler metal) authentic stainless steel pipe intended for high temperature and general corrosive service.

Material
Material is ordered to comply with the requirement of ASTM A-240 in 304, 304L, 316 and 316L grades regularly. Special grades can be made as per Customer's requirements.

Size Range
OD : ½" NPS (21.3 mm) to 8" NPS (219.1 mm)
Thick : NB size in schedule 5 10 S & 40S
Length : As per Customers Requirement.

Process of Manufactures
The pipe is manufactured from annealed strips on modern continuous forming mills with TIG welding process under inert gas atmosphere. All pipes are annealed at a minimum temperature of 1040°C, straightened, pickled and passivated, end finished & 100% tested in accordance with ASTM A-530

Tolerances
OD Size Range Over mm Under mm
Upto 1" NB 0.40 0.79
Over 1" NB to 4" NB 0.79 0.79
Over 4" NB to 8" NB 1.57 0.79
Thickness : ± 12.5 of nominal wall thickness Length : 0/+ 6 mm

Test
Normal : Tensile strength / Yield strength / Elongation, Flattening, Hydrostatic Pressure
Optional : Pneumatic / Air leakage, Eddy current, IG Corrosion.

Standard Weight Chart

Outside Dia SCH 5 SCH 10 S SCH 40 S
NB Inch mm
Thick Kg/Mtr. Thick Kg/Mtr. Thick Kg/Mtr.
½" 21.3 1.65 0.81 2.11 1.01 2.77 1.29
¾" 26.7 1.65 1.03 2.11 1.30 2.87 1.71
1" 33.4 1.65 1.31 2.77 2.12 3.38 2.54
1 ¼" 42.2 1.65 1.93 2.77 3.15 3.68 4.11
1 ½" 48.3 1.65 1.93 2.77 3.15 3.68 4.11
2" 60.3 1.65 2.42 2.77 3.98 0.481 0.531
1" 25.40 2.11 3.74 3.05 5.34 5.16 8.76
3" 88.9 2.11 4.58 3.05 6.54 5.49 11.45
3 ½" 101.6 2.11 5.25 3.05 7.52 5.74 13.77
4" 114.3 2.11 5.25 3.05 7.52 5.74 13.77
5" 141.3 2.77 9.50 3.40 11.74 6.55 22.10
6" 168.3 2.77 11.47 3.40 14.04 7.11 28.68
8" 219.1 2.77 14.99 3.76 20.25 8.18 43.16

Technical Data

S.S Fusion Welded Pipe from Plates as per ASTM A -358

Introduction & Scope
This covers electric - fusion welded authentic Chromium-nickel stainless steel pipe suitable for corrosive or high temperature service, or both. Five classes of pipe are covered under this specification.

Introduction & Scope
Class 1 : Double side welded using filler Material and 100% radiography
Class 2: Double side welded using filler Material. No radiography required
Class 3 : Single side welded using filler Material and 100% radiographed.
Class 4: As class 3, Accept root pass may be made without filler
Class 5: Double welded using filler Material and spot radiographed

Material
This specification covers nineteen grades of Material steel. The plate material comply with there requirements of ASTM A-240. Most commonly manufactured grades are 304, 304L, 304H, 316L 310

Size Range
OD : 10" NPS (273.05 mm) to 24" NPS (609.6 mm)
Thick : NB Size in Schedule 5, 10S, 10 and 40 S
Length : As per customer specification

Process of Manufactures
The pipes are manufactured from leveled plates which are edge beveled and progressively "O" formed on hydraulic presses. The edges of he pipe are either manually TIG welded or continuously welded on Track and Boom. Weld portion is radiographed as per requirement. Annealing of pipe is carried our on continuous furnace. Pipe is further straightened, sized, end finished, pressure tested, pickled and passivated, marked and packed.

Tolerances
OD : + ± 0.5% of specified diameter based on circumferential measurement.
Thick : Minimum thickness at any point not more than 0.3 mm under nominal thi
Out of Roundness : difference between maximum and minimum OD 1%
Straightness : 3 mm in 3 mtrs
Length : As per customer specification

Test
Transverse bend weld tests
Transverse tension test to ASME code IX para QW 150.
Hydrostatic Test ASTM A-530
Radiographic classed 1,3 to ASMIE Code VII para UW 51, Class 5 to ASME Sec. VII para UW 52

Outside Dia SCH 5 SCH 10 S SCH 40
NB Inch mm
Thick Kg/Mtr. Thick Kg/Mtr. Thick Kg/Mtr.
8" 219.08 277 14.99 3.76 20.250 8.18 43.16
10" 273.05 3.40 22.97 4.19 28.200 9.27 61.20
12" 323.85 3.96 31.72 4.57 36.530 9.53 74.92
14" 355.60 3.96 34.87 4.78 41.973 9.53 82.55
16" 406.40 4.19 42.18 4.78 48.051 9.53 94.66
18" 457.20 4.19 47.15 4.78 54.129 9.53 106.78
20" 508.00 4.77 60.13 5.54 69.674 9.53 118.90

Stainless Steel Pipes Mechanical Properties

Grade Tensile Strength min. Ks(Mpa) Yield Point Ksi (Mpa) Elongation % (G.L.: 2 in ro 50 mm Hardness Text Max
Full Section specimen Strip Specimen t<6/16in
t<5/16in
Round Specimen Brinell Rockwell
304 75(515) 30(205) 35 35 56t+17.50 28 192 B 90
304L 70(485) 25(170) 35 35 56t+17.50 28 192 B 90
304 H 75(515) 30(205) 35 35 56t+17.50 28 192 B 90
316 75(515) 30(305) 35 35 56t+17.50 28 192 B 90
316L 70(485) 25(170) 35 35 56t+17.50 28 192 B 90
316H 75(515) 30(205) 35 35 56t+17.50 28 192 B 90
316 Ti 75(515) 30(205) 35 35 56t+17.50 28 192 B 90
317 75(515) 30(205) 35 35 56t+17.50 28 192 B 90
309 75(515) 30(205) 35 35 56t+17.50 28 192 B 90
310S 75(515) 30(205) 35 35 56t+17.50 28 192 B 90
310H 75(515) 30(205) 35 35 56t+17.50 28 192 B 90
321 75(515) 30(205) 35 35 56t+17.50 28 192 B 90
321 H 75(205) 30(205) 35 35 56t+17.50 28 192 B 90
347 75(515) 30(205) 35 35 56t+17.50 28 192 B 90
347H 75(515) 30(205) 35 35 56t+17.50 28 192 B 90


Quality

Quality Assurance Plan

Sr.No. Process Operation Quality Characteristics Method Of Control
1 Raw Material (Strip) 1> Dimensions
2> Chemical analysis
3> Control of Slit which within specified limits 
4> Surface
Actual measurement as per Std. 
Analysis of all elements as per Std
Testing as per various Std.
Measurement of width, thickness & recording visual inspection.
2 Tube Mill (GTAW Type) 1> Weld Test, Flare Flanges, Flattering Reverse bend & Reverse Flattening.
2> Inspection of weld, seam
3> Dimensions
4> Surface
Testing as per ASTM specification & recording the result. One test for every 30 to 35 Mtrs. Visual inspection weld zone. O.D. , Thickness & Length.
Check roller surface profile& finish.
3 Solutions Annealing (At Min. 1040  C)
With continuous water quenching.
1> Temperature
2> Hardness
3> Micrometer
Automatic Relay Temp / Controller Adjusted to present level. Measurement of hardness as per Std. one Test / Lot / Heat
4 Straightening Straightness OD Surface Finish Adjust roller setting measure visual
5 Cutting Square cut Length Right angle to length, visual
6 Deburing Burs removel On OD and ID Edges Visual
7 Chemical Treatment
a) Pickling
b) Passivation
c) Bath
Concentration
Concentration
Temperature
One Test / Bath Day
One Test / Bath Day
Temperature
8 Hydrostatic Pressure Test Test Pressure 100 % Inspection at test pressure specified as per ASTM  Std.
9 Final Inspection IGC Test Dimensions Surface Physical Testing
Grade Check
Product Analysis
As per standard 100 % inspection of Dimensions as specified.
Visual Inspection for surface defects, Physical Testing and Chemical analysis as per ASTM standards.
10 Marketing Marking as per Std. Check for proper marking
11 Packing Seaworphy Packing / Wooden Cart Check for packing, Quantity, shipping mark,





PRODUCT RANGE
Carbon Steel Pipes & Tubes Alloy Steel Pipes & Tubes Stainless Steel Pipes & Tubes
Nickel Alloys Pipes & Tubes Pipe Fittings Flanges
Fastners / Olets Angle / Channel / Bar Coil / Sheet / Plates
API Pipes Cladded Pipes and Fittings Nickel Alloy Plates & Sheets
Plates
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