Understanding the Importance of Proper Pipe Welding Procedures for Spiral Steel Pipe Used in Groundwater Lines

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When installing underground water lines, using high-quality pipe is critical to ensuring long-term durability and resistance to environmental factors. One type of pipe commonly used for underground water lines is spiral steel pipe. However, simply using high-quality pipes is not enough to ensure the longevity of your water pipes. Proper pipe welding procedures are critical to ensuring that spiral steel pipes can withstand harsh underground conditions and provide reliable water delivery.

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Spiral steel pipes are widely used in groundwater pipelines due to their high strength and ability to withstand external pressure. The pipes are manufactured from hot-rolled steel coil strips that form a spiral shape. The spiral welding process used to manufacture these pipes provides excellent structural integrity, making them ideal for underground applications.

Nominal Outer Diameter		Nominal Wall Thickness (mm)
mm In		6.0	7.0	8.0	9.0	10.0	11.0	12.0	13.0	14.0	15.0	16.0	18.0	20.0	22.0
mm In		Weight Per Unit Length （kg/m）
219.1	8-5/8	31.53	36.61	41.65
273.1	10-3/4	39.52	45.94	52.30
323.9	12-3/4	47.04	54.71	62.32	69.89	77.41
（325）		47.20	54.90	62.54	70.14	77.68
355.6	14	51.73	60.18	68.58	76.93	85.23
（377.0）		54.89	63.87	72.80	81.67	90.50
406.4	16	59.25	68.95	78.60	88.20	97.76	107.26	116.72
（426.0）		62.14	72.33	82.46	92.55	102.59	112.58	122.51
457	18	66.73	77.68	88.58	99.44	110.24	120.99	131.69
（478.0）		69.84	81.30	92.72	104.09	115.41	126.69	137.90
508.0	20	74.28	86.49	98.65	110.75	122.81	134.82	146.79	158.69	170.56
（529.0）		77.38	90.11	102.78	115.40	127.99	140.52	152.99	165.43	177.80
559.0	22	81.82	95.29	108.70	122.07	135.38	148.65	161.88	175.04	188.17
610.0	24	89.37	104.10	118.77	133.39	147.97	162.48	176.97	191.40	205.78
（630.0）		92.33	107.54	122.71	137.83	152.90	167.92	182.89	197.81	212.68
660.0	26	96.77	112.73	128.63	144.48	160.30	176.05	191.77	207.43	223.04
711.0	28	104.32	121.53	138.70	155.81	172.88	189.89	206.86	223.78	240.65	257.47	274.24
（720.0）		105.65	123.09	140.47	157.81	175.10	192.34	209.52	226.66	243.75	260.80	277.79
762.0	30	111.86	130.34	148.76	167.13	185.45	203.73	211.95	240.13	258.26	276.33	294.36
813.0	32	119.41	139.14	158.82	178.45	198.03	217.56	237.05	256.48	275.86	295.20	314.48
（820.0）		120.45	140.35	160.20	180.00	199.76	219.46	239.12	258.72	278.28	297.79	317.25
864.0	34		147.94	168.88	189.77	210.61	231.40	252.14	272.83	293.47	314.06	334.61
914.0	36			178.75	200.87	222.94	244.96	266.94	288.86	310.73	332.56	354.34
（920.0）				179.93	202.20	224.42	246.59	286.70	290.78	312.79	334.78	356.68
965.0	38			188.81	212.19	235.52	258.80	282.03	305.21	328.34	351.43	374.46
1016.0	40			198.87	223.51	248.09	272.63	297.12	321.56	345.95	370.29	394.58	443.02
（1020.0）				199.66	224.39	249.08	273.72	298.31	322.84	347.33	371.77	396.16	444.77
1067.0	42			208.93	234.83	260.67	286.47	312.21	337.91	363.56	389.16	414.71	465.66
118.0	44			218.99	246.15	273.25	300.30	327.31	354.26	381.17	408.02	343.83	488.30
1168.0	46			228.86	257.24	285.58	313.87	342.10	370.29	398.43	426.52	454.56	510.49
1219.0	48			238.92	268.56	298.16	327.70	357.20	386.64	416.04	445.39	474.68	553.13
（1220.0）				239.12	268.78	198.40	327.97	357.49	386.96	146.38	445.76	475.08	533.58
1321.0	52				291.20	323.31	327.97	387.38	449.34	451.26	483.12	514.93	578.41
（1420.0）						347.72	355.37	416.66	451.08	485.41	519.74	553.96	622.32	690.52
1422.0	56					348.22	382.23	417.27	451.72	486.13	520.48	554.97	623.25	691.51	759.58
1524.0	60					373.38	410.44	447.46	484.43	521.34	558.21	595.03	688.52	741.82	814.91
（1620.0）						397.03	436.48	457.84	515.20	554.46	593.73	623.87	711.11	789.12	867.00
1626.0	64					398.53	438.11	477.64	517.13	556.56	595.95	635.28	713.80	792.13	870.26
1727.0	68					423.44	465.51	507.53	549.51	591.43	633.31	675.13	758.64	841.94	925.05
（1820.0）						446.37	492.74	535.06	579.32	623.50	667.71	711.79	799.92	887.81	975.51
1829.0	72						493.18			626.65	671.04	714.20	803.92	890.77	980.39
1930.0	76									661.52	708.40	755.23	848.75	942.07	1035.19
（2020.0）										692.60	741.69	790.75	888.70	986.41	1084.02
2032.0	80									696.74	746.13	795.48	894.03	992.38	1090.53
（2220.0）										761.65	815.68	869.66	977.50	1085.80	1192.53
（2420.0）												948.58	1066.26	1183.75	1301.04
（2540.0）	100											995.93	1119.53	1242.94	1366.15
（2845.0）	112											1116.28	1254.93	1393.37	1531.63

Note:

1.Also available are steel pipes in nominal outer diameter and nominal wall thickness between their adjacent sizes listed in the table, but a contractshall be signed.

2. The nominal outer diameters in brackets in the table are reserved diameters.

One of the most important aspects of using spiral steel pipe for underground water lines is proper welding procedures. Welding is the process of joining two metal parts by applying heat and pressure. For underground water pipelines, welding quality directly affects the overall integrity and reliability of the pipeline.

Proper pipe welding procedures for spiral steel pipe involve several critical steps. First, the surface of the pipe to be welded must be clean and free of any contaminants such as dirt, oil, or paint. This ensures that the weld is strong and free of impurities that could compromise its strength.

Next, welding parameters such as heat input, welding speed, and technique must be carefully controlled to achieve high-quality welds. Using proper welding materials and techniques is critical to preventing defects such as porosity, cracks, or lack of fusion, which can compromise the integrity of the weld.

Additionally, proper preheating and post-weld heat treatment procedures are critical for spiral steel pipe used in groundwater lines. Preheating helps reduce the risk of cracking and improves overall weld quality, while post-weld heat treatment relieves residual stresses and ensures a uniform microstructure across the entire weld area.

In addition, the use of advanced welding technologies such as automated welding processes and non-destructive testing can further improve the quality and reliability of welding. These technologies help ensure that welded joints meet the necessary strength and quality standards to provide peace of mind about the long-term performance of groundwater lines.

In summary, proper pipe welding procedures are critical to ensuring the integrity and longevity of spiral steel pipe used in groundwater lines. By following the necessary welding parameters, techniques and quality control measures, the risk of welding defects and failures can be significantly reduced. The result is a reliable and durable groundwater line that can withstand the test of time and provide safe and efficient water delivery services. For underground water lines, investing in a proper welding program is a critical step in ensuring the overall reliability and longevity of the pipeline.

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