Spirally welded steel tubes for pipe lines

Execution standards

 

1. Dimensions and linear weights

Outside diameter mm	Wall thickness , mm
	4,80	5,20	5,60	6,40	7,10	7,90	8,70	9,50	10,30	11,10	11,90	12,50	14,20
	Linear weight (Kg/ml)
219	25,37	27,43	29,48	33,57	37,12	41,14	-	-	-	-	-	-
273	31,76	34,35	36,94	42,09	46,57	51,67	-	-	-	-	-	-	-
323	-	40,87	43,96	50,11	55,47	61,56	67,62	-	-	-	-	-	-
355	-	44,93	48,33	55,11	61,02	67,74	74,42	-	-	-	-	-	-
406	-	51,45	55,35	63,13	69,91	77,63	85,32	92,98	100,61	108,20	115,77	121,42	-
457	-	-	62,34	71,12	78,77	87,49	96,18	104,84	113,46	122,05	130,62	137,02	-
508	-	-	69,38	79,16	87,70	97,43	107,12	116,78	126,41	136,01	145,58	152,74	-
610	-	-	-	95,26	105,56	117,30	129,00	140,68	152,32	163,93	175,51	184,19	-
711	-	-	-	111,20	123,24	136,97	150,67	164,34	177,98	191,58	205,15	215,32	244,01
813	-	-	-	-	141,10	156,84	172,56	188,24	203,88	219,50	235,09	246,76	279,73
914	-	-	-	-	158,79	176,52	194,22	211,90	229,54	247,15	264,72	277,90	315,10
1016	-	-	-	-	-	196,39	216,11	235,79	255,45	275,07	294,66	309,34	350,82
1118	-	-	-	-	-	-	-	259,69	281,35	302,99	324,59	340,79	386,54
1219	-	-	-	-	-	-	-	283,35	307,01	330,63	354,23	371,92	421,91
1321	-	-	-	-	-	-	-	307,26	332.93	358,57	384,18	403,36	457,63
1422	-	-	-	-	-	-	-	330,91	358,57	386,20	413,80	434,50	493,00
1524	-	-	-	-	-	-	-	354,82	384,50	414,14	443,75	465,94	528,72
1626	-	-	-	-	-	-	-	-	410,38	442,04	473,66	497,39	565,44

 

2. Lenghts

- manufacture lenghts	6 - 12,5 m
- fixed lenghts within manufacture lenghts range

3.Chemical requirements for liquid steel - %

Steel grade		C	Si max.	Mn	P max.	S max.
Alphanumeric symbols	Numeric symbols
P 235 GH	1.0345	≤0,16	0,35	≤1,20	0,025	0,020
P 265 GH	1.0425	≤0,20	0,40	≤1,40	0,025	0,020

4.Mechanical characteristics at normal temperature for wal thickness up to 40 mm, including

Steel grade		Tensile strenght caracteristics at a normal temperature					Impact bend caracteristics
Alphanumeric symbols	Numeric symbols	Superior yield limit  or conventional yield limit ReH or Rp0,2 for T(mm) min		Tensile strenght Rm	Elongation A min.   %		Medium absorbed energy KV J At a temperature of de °C                                 l                                              t
		T≤16	16<T≤40				20	0	-10	20	0
		MPa	MPa	MPa	l	t
P235GH	1.0345	235	225	360...500	25	23	-	40	28	-	27
P265GH	1.0425	265	255	410...570	23	21	-	40	28	-	27

5. The values of minimum conventional yield limit, Rp0,2 at a rise temperature for wall thickness T up to 40mm, inclusive

Steel grade		Conventional yield limit, Rp0,2 Mpa At a temperature of °C
Alphanumeric symbol	Numeric symbol	100	150	200	250	300	350	400
P235GH	1.0345	198	187	170	150	132	120	112
P265GH	1.0425	226	213	192	171	154	141	134

 

6. Hydrostatic test pressure (bar)

   The maximum hydrostatic test pressure value is of maximum 70 bari, depending on the type of steel,  wall thickness and the diameter of the pipe.The time of maintaining the hydrostatic test pressure is of minimum 5 seconds for pipes with external diameter ≤ 457mm and minimum 10 seconds for greater diameters.

 

Protection, marking, documents, delivery

- The pipes are delivered unprotected or coated with extruded polyethylene for temperatures up to 70°C.
- the pipes are delivered with bevelled ends to an angle of 30 degrees +/- 5 degrees, keeping a front ring of 1.60 +/- 0,80 mm;
- each pipe will be marked - stencilled and painted at about 300 mm from one of the ends;
- each lot of pipes will be accompanied by the mill test certificate according to EN 10204/DIN 50049;
- the delivery will be made by railway, truck or ship.

Top