api 5l grade x42 x52 carbon steel pipe

Specifications 1.api 5l grade x42 x52 Carbon Steel Pipe

2. type of pipe: seamless,welded

3. OD: 20mm to 660m

  api 5l grade gr.b x42 x52 carbon steel pipe API 5L
Generally speaking, API 5L refers to API 5L line pipe,which is out of the ground the oil, gas, water, transported by pipeline to pipe oil and gas industry companies. according to the manufacture process and the tube bloom used different shapes, api 5l can be divided into api 5l seamless steel pipeand api Welded Steel Pipe, among the usage quantity of welded steel pipe is more than Seamless Steel Pipe.   Surface conditions, imperfections and defects    a) All pipes shall be free from defects in the finished condition. All pipes shall be free from cracks, sweats and   leaks.   b) Laminations or inclusions extending into the face or bevel of the pipe and having a visually determined length in the circumferential direction > 6.4 mm (0.250 in) shall be classified as defects. (Shall be rejected or cut off.)   c) For other than dents, geometric deviations (e.g. flat spots and peaks) that exceed 3,2 mm in depth shall be considered defects. (Be cut off or rejected.)   d) For dents, the length in any direction exceed 0,5 D or the depth exceed 3.2(for cold-formed dents with sharp-bottom gouges) or 6.4(for other dents) shall be considered defects. (Be cut off or rejected.)   e) Any hard spot larger than 50 mm, if its hardness exceeds35 HRC, 345 HV10 or 327 HBW, shall be classified as defects. (Be cut off or rejected.)   f) Imperfections that have a depth <0,125 t and do not encroach on the minimum permissible wall thickness shall be classified as acceptable imperfections. (May remain or be cosmetically dressed-out.)   g) Imperfections that have a depth > 0,125 t and do not encroach on the minimum permissible wall thickness shall be classified as defects. (Smoothly dress-out, or be rejected.)   h) Imperfections that encroach on the minimum permissible wall thickness shall be classified as defects. (Be rejected.)   Mass per unit length   Mass per unit length: p l = t(D - t)x0.02466 (kg/m)               Inspection Frequency of SMLS (API 5L - 2007)  

Type of inspection	PSL 1 pipe grade (SMLS)	PSL 2 pipe grade (SMLS)
Heat analysis	One analysis per heat of steel
Product analysis	Two analyses per heat of steel (taken from separate product items)
Tensile testing of the pipe body	Once per test unit of pipe with the same cold-expansion ratio
CVN impact testing		Once per test unit of pipe with the same cold-expansion ratio
Hydrostatic testing	Each pipe
Visual inspection	Each pipe, but may be replaced by other inspection methods that have a demonstrated capability of detecting surface defects.
Pipe diameter and out-of-roundness	At least once per 4 h per operating shift plus whenever any change of pipe size occurs during the operating shift
Wall thickness measurement	Each pipe
Other dimensional testing	Random testing, with the details left to the discretion of the manufacturer
Weighing of pipe with D < 141,3 mm (5.563 in)	Each pipe or each lot, with the choice being at the discretion of the manufacturer
Weighing of pipe with D>141,3 mm (5.563 in)	Each pipe
Non-destructive inspection	In accordance with Annex E. EMI/UT/MT or a combination is required just for L245 (B)(Q+T). For grades base on agreement.	In accordance with Annex E. EMI/UT/MT or a combination is required.

    Note: Test unit: with the same specified outside diameter and specified wall thickness, by the same pipe- manufacturing process, from the same heat and under the same pipe-manufacturing conditions     Number, orientation and location of test pieces per sample for mechanical tests  

Product specificatio n levels	Type of pipe
PSL1	SMLS, not colde xpanded
	SMLS, colde xpanded
PSL2	SMLS, not cold expanded
	SMLS, colde xpanded
Note: (a) L — longitudinal sample, T — transverse sample (b)  Full-section longitudinal test pieces may be used at the option of the manufacturer. (c)  If agreed, transverse test pieces may be used. (d)   If agreed, annular test pieces may be used for the determination of transverse yield strength by the hydraulic ring expansion test in accordance with ASTM A370.

  (Test pieces for the tensile test: Rectangular test pieces, representing the full wall thickness of the pipe, shall be taken ; Transverse test pieces shall be flattened; Alternatively, round test pieces obtained from non­flattened samples may be used.)        

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