Limestone Quarry Plant

One of the Top 500 enterprises in China foreign trade

QCCO was approved as a member of “China Association for Contracting Projects Abroad “and granted a membership certificate on Sep 28,2005; “Credibility Rating AAA certificate in Foreign Trade” was granted to QCCO by China Shippers’ Association

 
 

API 5L line Pipe Specification,Covers WELDED and SEAMLESS pipe


Specification

API 5L NPS 1/8 -- 26

Scope

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

Open-hearth Basic-oxygen Electric-furnace

Hot-Dipped

Galvanizing

May be ordered galvanized.

Permissible Variations in Wall Thickness

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

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

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

Lists hydrostatic inspection test pressures Test Pressures are held for not less than: for all sizes and grades covered by the Seamless (all sizes) -- 5 seconds specification. Welded (NPS 18 and smaller) -- 5 seconds

(NPS 20 and larger) -- 10 seconds

Permissible Variations in Weights per Foot

For each length of Standard Weight, Regular Weight, For Special Plain End -- Not more than plus 10% minus 5%. Extra Strong, and Double Extra Strong -- Not more than

plus 10% minus 3.5%. For Carload Lots -- Not more than minus 1.75%.

Permissible Variations in Outside Diameter

Outside Diameter Sizes Over Under

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

NPS 1 1/2 and smaller 1/64" 1/32"

NPS 2 through 4 1% 1% (Buttweld Only) NPS 2 through 18 .75% .75%

NPS 20 through 26

Non-expanded 1% 1%

Mechanical Tests Specified

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

Seamless and Buttwelded -- All Sizes -- Longitudinal Specimens Degree of Bend Diameter of Mandrel Electric Weld -- NPS 6 and smaller -- Longitudinal For all API Uses 90 12 x OD of pipe NPS 8 and Larger -- Transverse

Number of Tests Required

On One Length

NPS From Each Lot of Flattening Tensile 5 and smaller 40 or less Non-Expanded Electric-Weld for single lengths crop ends from each 6 through 12 200 or less length. For multiple lengths, crop ends from each length, plus 2 14 and larger 100 or less intermediate rings.

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

Lengths

Minimum

Shortest Shortest Average Length Length in 95% Length Threaded & In Entire of Entire of Entire Coupled Pipe Shipment Shipment Shipment

Single Random 16' 0" 18' 0" -­Double Random 22' 0" -- 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. SR5--Charpy impact Testing--Welded Pipe 20" & larger--Grade X52 or higher. SR3 -- Color Identification. SR6 -- Drop Weight Tear Testing--Welded Pipe 20" & larger--Grade X52 or higher. SR4 -- Nondestructive Inspection of Seamless Pipe. SR8 -- Fracture Tough ness Testing of Line Pipe.

 

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