شرح و جزئیات استانداردها ( API5L )، استاندارد لوله





Specification

مشخصات

API 5L NPS 1/8 -- 26
Scope

دامنه

Covers WELDED and SEAMLESS pipe suitable for use in conveying gas, water, and oil in both the oil and natural gas industries.

 

 


Kinds of Steel Permitted For Pipe Material

انواع فولادهای مجاز جهت مواد اولیه

Open-hearth          Basic-oxygen Electric-furnace

 

 


Hot-Dipped Galvanizing

گالوانیزه گرم

May be ordered galvanized.

 

 


Permissible Variations in Wall Thickness

تغییرات مجاز در ضخامت


Grade A, B, A25
X42 through X80

NPS 2 1/2 and smaller -- Seamless and welded, %

+20 -- 12.5
+15 -- 12.5
NPS 3 -- Seamless and welded, %
+18 -- 12.5
+15 -- 12.5
NPS 4 through 18 -- Seamless and welded, %
+15 -- 12.5
+15 -- 12.5
NPS 20 and larger -- Welded, %
+17.5 -- 10.0
+19.5 --8.0
NPS 20 and larger -- Seamless, %
+15.0 -- 12.5
+17.5 -- 10.0

 

 


Chemical Requirements

مشخصات شیمیایی مورد نیاز


C max % Mn max % P max % S max %
Seamless or ERW




Grade A
0.25 0.95 0.05 0.06
Grade B
0.30 1.20 0.05 0.06
Continuous-weld
- - 0.08 0.06

 

 


Tensile Requirements

نیروی کشش موردنیاز

Lists minimum yield and tensile strength for all grads as well as a maximum tensile strength for X80.

Maximum yield-to-tensile ratios outlined for cold-expanded pipe--may be waived when a fracture toughness requirement is specified.

 

 


Hydrostatic Testing

تست هیدرواستاتیک

Lists hydrostatic inspection test pressures for all sizes and grades covered by the specification.

Test Pressures are held for not less than:

Seamless:

All sizes
5 seconds
Welded:
NPS 18 and smaller
NPS 20 and larger
5 seconds
10 seconds

 

 


Permissible Variations

in Weights per Foot

تغییرات مجاز وزن در فوت

For each length of Standard Weight, Regular Weight, Extra Strong, and Double Extra Strong -- Not more than plus 10% minus 3.5%.

For Special Plain End -- Not more than plus 10% minus 5%.

For Carload Lots -- Not more than minus 1.75%..

 

 


Permissible Variations

in Outside Diameter

تغییرات مجاز در قطر خارجی

Outside Diameter

at any point shall not vary from standard specified more than:

 

Sizes Over Under
NPS 1 1/2 and smaller
1/64" 1/32"
NPS 2 through 4
1% 1% (Buttweld Only)
NPS 2 through 18
0.75% 0.75%
NPS 20 through 26 non-expanded
1% 1%

 

 


Mechanical Tests Specified

تستهای مکانیکی تعریف شده

Tensile Test --

Seamless and Buttwelded -- All Sizes -- Longitudinal Specimens

Electric Weld --

NPS 6 and smaller NPS 8 and Larger
Longitudinal Transverse

 

Bending Test (Cold) -- 2" and smaller Buttweld.


Degree of Bend
Diameter of Mandrel
For Normal API Uses
90
12 x OD of pipe

 

 


Number of Tests Required

تستهای موردنیاز


NPS On One Length From Each Lot of
Tensile 5 and smaller 40 or less

6 through 12 200 or less

14 and larger 100 or less

2 and smaller (Buttweld) 25 tons or less
Bending 1 1/2 and smaller (Buttweld) 50 tons or less

 

Flattening Tensile

Non-Expanded Electric-Weld for single lengths crop ends from each length. For multiple lengths, crop ends from each length, plus 2 intermediate rings.

 

 


Lengths

طول ها


Threded and Coupled Pipe
Single Random
Double Random
Shortest Length in Entire Shipment
16' 0"
22' 0"
Shortest Lenght in 95% of Entire Shipment
18' 0"
--
Minimum Average Length of Entire Shipment
--
35' 0"

 

 


Required Markings on Each Length (On Tags attached to each Bundle in case of Bundled Pipe)

Paint Stenciled or Die Stamped (by agreement).

Manufacturer's name or mark. Spec 5L, size, weight per foot, grade, process of manufacture, type of steel, length (NPS 4 and larger only). Test pressure when higher than labulated (NPS 2 and larger only).

Heat treat symbols, as applicable -- HN, HS, HA or HQ.

 

 


General Information

Supplementary Requirements available when specified.

SR3 -- Color Identification.

SR4 -- Nondestructive Inspection of Seamless Pipe.

SR5 -- Charpy impact Testing -- Welded Pipe 20" & larger -- Grade X52 or higher.

SR6 -- Drop Weight Tear Testing -- Welded Pipe 20" & larger -- Grade X52 or higher.

SR8 -- Fracture Tough ness Testing of Line Pipe.

تماس با آیرون پایپ

تهران- جاده قدیم کرج بازار آهن غرب تهران مجتمع تجاری بهاران 2 بلوک 20 پلاک 255 و 256

66316999 – 66316888 – 66318747

66316551 – 66316212- 66318746

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