Pre-bending quality control of ssaw steel pipe for piling is on both sides of the steel sheet bending quality, including: after pre-bending bending radius edge of the plate reaches a radius of piling pipe; both sides of the curved equal to the width consistent degree of bending, symmetrical parallel, parallelism specified the range; within the scope of pre-bending radius of curvature of each point in a predetermined, and everywhere along the board edge in the same direction; pre-bent plate edge does not exist after the chicane, there was no wave shape, straightness within a predetermined range. Preflex piling pipe production line is one of the primary process, the purpose is to complete both sides of the plate pre-bending, bending radius on both sides of the steel sheet at or near the radius of the steel pipe production specifications, thus ensuring the geometry and dimensions of spiral steel pipe weld area accuracy. If there is no pre-bending in the UOE molding, O-molding press, even when the compression ratio has been about 1% of the steel edges will still be straight section, resulting tube was formed after the beak Peach, subsequent to the pre-weld seam trouble, can lead to the wrong side or welding burn, even after expanding, it can not be eliminated, and also damage the enlarged diameter head.

According spiral pipe corrosion mechanism, and it has so far proposed a variety of protective measures, such protective measures basically be divided into the following types: 1, For the environment among the harmful substances from outside to inside gradually invasive characteristics, including permeability to adopt a series of technical control template, water spray material, impermeable layers, polymer modified mortar and the like. 2, For the nature of the electrochemical corrosion of steel, steel to eliminate the use of chemical principles of fundamental electrochemical corrosion. This type of measure such as cathodic protection, electrochemical desalination (again simplified) and technology can improve the rust inhibitor of steel corrosion resistance. 3, The use of hard or corrosion resistant material wrapped or coated on the surface of steel, such as layers of reinforced epoxy, steel and other stainless steel cladding. 4, The use of low water conservation fully wet glue double-doped high-performance concrete, can significantly improve the permeability of salt. In this concrete layer having an appropriate thickness of the protective layer is to improve the durability of the basic measures.

CARBON STEEL SEAMLESS PIPE; SPEC API 5L Gr. B /ASTM A106 /A53 GR.B; /BUTTWELD END ASME B16.25 (NACE MR-01-75) Item Code DESCRIPTION Carbon steel pipes Q'ty       Mtrs Q'ty Pcs Unit Weight kg/m  Unit Price USD/TON Stock in SGP (Ton) Stock in CHN(Ton) Stock in Total (Ton) 01 PCSA-0001 1/2" SCH 80/XS 12000 2000 1.62 760.00 19.44   19.440 02 PCSA-0002 3/4" SCH 80/XS 4200 700 2.20 705.00 9.24   9.240 03 PCSA-0003 1" SCH 40/STD 600 100 2.50 655.00 1.50 1.56 3.060 04 PCSA-0004 1" SCH 80/XS 24000 4000 3.24 665.00 77.76   77.760 05 PCSA-0005 1-1/4" SCH 80/XS 3000 500 4.47 630.00 13.41   13.410 06 PCSA-0006 1-1/4" SCH 160 600 100 5.61 630.00 3.37   3.366 07 PCSA-0007 1-1/2" SCH 80/XS 19800 3300 5.41 630.00 107.12   107.118 08 PCSA-0008 1-1/2" SCH 160 3900 650 7.25 670.00 28.28   28.275 09 PCSA-0009 2" SCH STD 9000 1500 5.44 630.00 48.96   48.960 10 PCSA-0010 2" SCH 80/XS 24000 4000 7.48 630.00 179.52   179.520 11 PCSA-0011 2" SCH 160 1920 320 11.11 705.00 21.33 5.67 26.997 12 PCSA-0012 2-1/2" SCH STD 3000 500 8.63 595.00 25.89   25.890 13 PCSA-0013 2-1/2" SCH 80/XS 5640 940 11.41 595.00 64.35   64.352 14 PCSA-0014 3" SCH STD 13800 2300 11.29 590.00 155.80 13.55 169.350 15 PCSA-0015 3" SCH 80/XS 16800 2800 15.27 590.00 256.54 27.58 284.114 16 PCSA-0016 4" SCH STD 11400 1900 16.07 565.00 183.20 115.80 298.998 17 PCSA-0017 4" SCH 80/XS 30000 5000 22.32 565.00 669.60 521.08 1,190.683 18 PCSA-0018 5" SCH STD 6000 1000 21.77 565.00 130.62 72.62 203.245 19 PCSA-0019 5" SCH 80/XS 5400 900 30.97 565.00 167.24 94.58 261.820 20 PCSA-0020 6" SCH STD 7200 1200 28.26 550.00 203.47 42.56 246.032 21 PCSA-0021 6" SCH 80/XS 30000 5000 42.56 550.00 1276.80 529.11 1,805.906 22 PCSA-0022 8" SCH STD 4500 750 42.55 540.00 191.48 145.01 336.485 23 PCSA-0023 8" SCH 80/XS 6600 1100 64.64 540.00 426.62 387.45 814.076 24 PCSA-0024 10" SCH 40/STD 1800 300 60.31 540.00 108.56 46.32 154.876 25 PCSA-0025 10" SCH XS 1800 300 81.55 540.00 146.79 102.75 249.543 26 PCSA-0026 12" SCH STD 1500 250 73.88 540.00 110.82 64.28 175.096 27 PCSA-0027 12" SCH 40 180 30 79.73 540.00 14.35 8.13 22.484 28 PCSA-0028 12" SCH XS 1800 300 97.46 540.00 175.43 89.47 264.896

CARBON STEEL SEAMLESS PIPE SPEC API 5L Gr. B /ASTM A106 /A53 GR.B /BUTTWELD END ASME B16.25 / NACE MR-01-75 HOT DIPPED GALVANIZED Item Code DESCRIPTION Carbon steel pipes Q'ty       Mtrs Q'ty       Pcs Unit Weight kg/m  Unit Price USD/TON Stock in SGP (Ton) Stock in CHN(Ton)  Stock in Total (Ton) 01 PCSB-0001 1/2" SCH 80/XS 2760 460 1.62 965.00 4.47   4.471 02 PCSB-0002 3/4" SCH 80/XS 1200 200 2.20 910.00 2.64 1.00 3.643 03 PCSB-0003 1" SCH 80/XS 4560 760 3.24 860.00 14.77 3.54 18.312 04 PCSB-0004 1-1/4" SCH 80/XS 600 100 4.47 820.00 2.68   2.682 05 PCSB-0005 1-1/2" SCH 80/XS 3000 500 5.41 820.00 16.23 3.96 20.190 06 PCSB-0006 2" SCH 40 1320 220 5.44 810.00 7.18   7.181 07 PCSB-0007 2" SCH 80/XS 4020 670 7.48 810.00 30.07 3.32 33.391 08 PCSB-0008 3" SCH STD 1320 220 11.29 770.00 14.90   14.903

CARBON STEEL SEAMLESS PIPE SPEC ASTM A106 GR-B; DIMENSION ASME B36.10 STANDARD; BUTTWELD ENDS AS PER ASME B16.25 STANDARD Item Code DESCRIPTION Carbon steel pipes Q'ty Mtr Q'ty pcs Unit Weight kg/m Unit Cost USD/TON (EXW) Stock (Ton) 01 PCSC-0001 2"(5.8m) SCH XXS 1160 200 13.44 480.00 15.59 02 PCSC-0002 2-1/2" SCH XXS 1200 200 20.39 480.00 24.47 03 PCSC-0003 3" SCH 80 / XS 3600 600 15.29 460.00 55.04 04 PCSC-0004 3" SCH XXS 1200 200 27.68 490.00 33.22 05 PCSC-0005 3" SCH 160 1200 200 21.35 490.00 25.62 06 PCSC-0006 4" SCH 80 / XS 7200 1200 22.32 460.00 160.70 07 PCSC-0007 4" SCH 120 1200 200 16.07 480.00 19.28 08 PCSC-0008 4" SCH 160 1200 200 33.54 480.00 40.25 09 PCSC-0009 4" SCH XXS 1200 200 41.03 480.00 49.24 10 PCSC-0010 5" SCH 80 / XS 7200 1200 39.92 460.00 287.42 11 PCSC-0011 5"(5.8m) SCH 80 / XS 1160 200 39.92 420.00 46.31 12 PCSC-0012 5" SCH 120 1200 200 40.28 480.00 48.34 13 PCSC-0013 5" SCH 160 1200 200 49.11 480.00 58.93 14 PCSC-0014 5" SCH XXS 1200 200 30.97 480.00 37.16 15 PCSC-0015 6"(5.8m) SCH 40 / STD 1160 200 36.14 420.00 41.92 16 PCSC-0016 6" SCH 80 / XS 4800 800 42.56 460.00 204.29 17 PCSC-0017 6" SCH 120 1200 200 54.20 480.00 65.04 18 PCSC-0018 6" SCH 160 1800 300 67.56 480.00 121.61 19 PCSC-0019 6" SCH XXS 2400 400 79.22 480.00 190.13 20 PCSC-0020 8" SCH 20 600 100 33.31 480.00 19.99 21 PCSC-0021 8" SCH 80 / XS 3600 600 64.64 480.00 232.70 22 PCSC-0022 8" SCH XXS 600 100 107.90 480.00 64.74 23 PCSC-0023 8"(5.8m) SCH XXS 1160 200 107.90 480.00 125.16 24 PCSC-0024 10" SCH STD/S40 600 100 60.30 480.00 36.18 25 PCSC-0025 10" SCH XS 2400 400 81.55 480.00 195.72 26 PCSC-0026 10" SCH 100 600 100 114.70 480.00 68.82 27 PCSC-0027 10" SCH 140/XXS 600 100 155.10 480.00 93.06 28 PCSC-0028 10" SCH 160 600 100 172.30 480.00 103.38 29 PCSC-0029 12"Weld SCH 40 600 100 79.73 490.00 47.84 30 PCSC-0030 12" SCH XS 1200 200 97.46 490.00 116.95 31 PCSC-0031 12"(5.8m) SCH 120/XXS 1160 200 186.90 490.00 216.80 32 PCSC-0032 12" SCH 140 600 100 208.14 490.00 124.88 33 PCSC-0033 12" SCH 160 600 100 238.70 490.00 143.22 34 PCSC-0034 14" SCH XS 600 100 107.30 520.00 64.38 35 PCSC-0035 16"(5.8m) SCH 20 580 100 77.83 520.00 45.14 36 PCSC-0036 16" SCH 60 600 100 160.19 520.00 96.11 37 PCSC-0037 16" SCH 100 600 100 245.56 520.00 147.34 38 PCSC-0038 16" SCH 120 600 100 286.64 520.00 171.98 39 PCSC-0039 16" SCH 160 600 100 365.35 520.00 219.21 40 PCSC-0040 18" SCH 100 480 80 254.55 520.00 122.18 41 PCSC-0041 20" SCH STD 480 80 117.15 520.00 56.23 42 PCSC-0042 20" SCH XS 480 80 155.10 520.00 74.45 43 PCSC-0043 20"(5.8m) SCH 160 464 80 564.81 520.00 262.07 44 PCSC-0044 22" SCH STD 480 80 129.10 550.00 61.97 45 PCSC-0045 22" SCH 80 480 80 373.83 550.00 179.44 46 PCSC-0046 24" SCH 20/STD 480 80 141.12 550.00 67.74 47 PCSC-0047 26'' SCH XS 480 80 202.72 550.00 97.31 48 PCSC-0048 28" SCH XS 480 80 218.69 580.00 104.97 49 PCSC-0049 32" SCH STD 480 80 188.80 580.00 90.62 50 PCSC-0050 32" SCH XS 360 60 250.60 580.00 90.22 51 PCSC-0051 38" Weld SCH XS 360 60 298.24 580.00 107.37