1、JIS G3469 Polyethylene coated Steel Pipes (JIS G 3469 / JISG3469) 1. Scope This Japanese Industrial Standard specifies the external polyehylene coated steel pipes, hereinafter referred to as the coated steel pipes, mainly used for underground(1) services transporting gas, oil, water, etc. Note(1) Th
2、e underground referred to herein includes the bottoms of river, sea, etc. Remarks The standards cited in this Standard are as follows. 2. Classification The coated steel pipes shall be classified into 3 classes, and their symbols shall be as given in Table 1. Table 1 Classification Symbol of class P
3、olyethylene Undercoat Application P1H First layer Adhesive Straight pipe P2S Second layer Gluing agent Straight pipe P1F First layer - Deformed pipe Remarks 1. Subject to the agreement between parties concerned with delivery, gluing agent on the first layer and adhesive on the second layer can be ap
4、plied respectively. The symbols of calss thereof shall be P1S and P2H respectively. 2. The outer layer of polythylene used for P2S shall be for the purpose of packaging. * World Standard Comferens Table KS JIS ASTM DIN BS Grade number Polyethylene Undercoat Application GRADE Grade number GRADE - - -
5、 First layer Adhesive Straight pipe P1H P1H - - - Second layer Gluing agent Straight pipe P2S P2S - - - D 3589 First layer - Deformed pipe P1F G-3469 P1F - - - 3.1 Appearance The coating shall stick wall to the steel surface and be free from harmful flaws, unevenness, mingling of foreign subatances,
6、 etc. 3.2 Shape and dimension The shape and dimensions shall be as follows (1) The nominal dimeters shall be expressed by the nominal diameters of the original pipes(2). (2) The position and shape of coating at both pipe ends, shall be, unless otherwise specified, as shown in Table 2. In case of pla
7、in ends, however, it shall be agreed between the parties concerned with delivery. (3) The maximum outside diameter of coated steel pipes using mechanical couplings may be specified by the purchaser upon agreement with the manufacturer. Note(2) The original pipes signify both straight and deformed pi
8、pes before coating. Table 2 Position and shape of coating at pipe end Unit :mm Shape of pipe end Position and shape of coating at pipe end Threaded Bevel Flanged(3) Note(3) In the case of mounting flanges to the pipes after coating, it shall be agreed upon between the parties concerned with delivery
9、. 3.3 Thickness of coating The coating thickness and its tolerances for each nominal diameter of the coated steel pipes shall be subjected to the test specified in 6.1 and shall conform to Table 3. The thickness of coating of P1H to be used with threaded couplings, however, may be specified upon agr
10、ement between the parties concerned with delivery. The Standard is downloaded from Standard Sharing3.4 Pinholes The coated steel pipe shall be free from defects which generate sparks, when pinhole-tested as specified in 6.2. 3.5 Peeling strength The coated steel pipes P1H and P1F shall be subjected
11、 to the test specified in 6.3 and shall show the strength of 35 N/10 mm width and over. Table 3 Thickness of polyethylene coating and its tolerance Unit mm P1H(4) and P1F P2S Coating Coating Packing jacket (Informative reference) Nominal diameter A Thickness Tolerance Nominal diameter A Thickness To
12、lerance Thickness Tolerance 15 1.5 15 0.6 1.0 20 1.5 20 0.6 1.0 25 1.5 25 0.6 1.0 32 1.5 32 0.6 1.0 40 1.5 40 0.6 1.0 50 1.5 50 0.6 1.0 65 1.5 65 0.6 1.0 80 1.5 80 0.6 1.0 90 1.5 +Not specified -0.3 90 0.6 1.0 100 2.0 100 0.8 1.1 125 2.0 125 0.8 +Not specified -0.2 1.1 150 2.0 +Not specified -0.4 15
13、0 0.9 1.2 +Not specified -0.3 200 2.5 200 1.1 1.5 250 2.5 250 1.2 1.6 300 2.5 300 1.2 1.7 +Not specified -0.4 350 2.5 350 1.2 2.0 400 2.5 400 1.2 +Not specified -0.3 2.0 450 2.5 450 1.3 2.0 500 2.5 +Not specified -0.5 500 1.3 +Not specified 2.0 +Not specified -0.5 550 2.5 550 1.3 2.0 600 2.5 600 1.3
14、 2.0 650 2.5 650 1.3 2.0 700 2.5 700 1.3 2.0 750 2.5 750 1.3 2.0 800 2.5 800 1.3 -0.4 2.0 850 2.5 900 2.5 1000 2.5 1100 3.0 1200 3.0 1350 3.0 1500 3.0 1600 3.0 1800 3.0 2000 3.0 4.1 original pipes 4.1.1 The original pipes to be used for the coated steel pipes shall be in accordance with either Table
15、 4 or 5. If original pipes other than those given in Tables 4 and 5 are required, it shall be as agreed upon between the parties concerned with delivery. Table 4 Straight pipes Nominal diameter A Straight pipes 152000 JIS G 3452 JIS G 3454 JIS G 3457 Table 5 Deformed pipes The Standard is downloaded
16、 from Standard SharingNominal diameter A Deformed pipes 152000 JIS B 2311 JIS B 2312 JIS B 2313 JIS B 3451 4.1.2 Shape of both ends of original pipes The shape of both ends of original pipes shall conform to either of the shapes given in Table 6. If pipe-end shpae other than those given in Table 6
17、is required, it shall be as agreed upon between the parties concerned with delivery. Table 6 Pipe-end shapes Niminal diameter ! Pipe-end shapes 150 and under Plain, bevel, threaded or flanged end Over 150 Plain, bevel or flanged end 4.2 Coating materials Polyethylene shall be as specified in Appendi
18、x 1. Adhesives and gluing agents used as undercoat shall be as specified in Appendix 2 and Appendix 3. 5.1 Pretreatments Harmful oils, rusr, and other foreign substances adhering to the original pipes shall be removed by mechanical or chemical treatment. 5.2 Coating of straight pipes 5.2.1 P1H For P
19、1H, the outer surface of pretreated original pipes shall be preheated and, after being applied with adhesive 0.05 to 0.3mm thick by an appropriate method, shall be coated with polyethylene by extrusion method. Remarks In case of P1S, the outer surface of pretreated original pipes shall be applied wi
20、th glueing agent 0.1 to 0.5mm thick by an appropriate method and shall be coated with polyethylene by extrusion method. 5.2.2 P2S For P2S, the outer surface of pretreated original pipes shall be applied with glueing agent 0.1 to 0.5mm thick by an appropriate method and, after being coated with polye
21、thylene by extrusion method, shall be coated with packaging polyethylene layer by the same way. Inthis case, coating polyethylene and packaging polyethylene layer shall naver come to sticking to each other. When so designated by the purchaser, packaging polyethylene later shall be omitted. Remarks I
22、n case fo P2H, the outer surface of pretreated original pipes shall be preheated and applied with adhesive 0.05 to 0.3mm thick by an appropriate method and, after being coated with polyethylene by extrusion method, shall be coated with packaging polyethylene layer by the same way. In this case, coat
23、ing polyethylene and packaging polyethylene layer shall never come to sticking to each other. 5.3 Coating of deformed pipes For P I F, the outer surface or pretreated original pipes shall be heated to the temperature suitavle for ahdestion by heat of polyethylene and shall be coated by the methods s
24、uch as fluidizing immersion, spraying or spreading of polyethylene powder. 6. Tests 6.1 Coating thickness test The thickness of coating of the coated steel pipe shall be measured at four arbitrary points which lie diametrically at right angles at one end of the pipe. 6.2 Pinholes test The holiday de
25、tector shall be used in the pinhole testing of coated steel pipe. Existence of pinholes shall be examined applying 10000 to 12000 V for contact type detector and 20000 to 40000 V for noncontact type detector, respectively. 6.3 Peeling strength test In the peeling strength test, the coating shall be
26、given 2 parallel cut lines reaching the original pipe surface, 10mm apart and not less than 60mm long, and after one end of the coating between the cut lines has been raised by peeling a little, it shall be peeled at a rate of about 50mm/min in the direction of about 90? or about 180? at ordinary te
27、mperature, and the load during peeling shall be determined. 7. Inspection 7.1 Inspection in general The general requirements of the inspection for the coated steel pipes shall be in accordance with 2. in JIS G 0303. 7.2 Appearance inspection The appearance inspection of coated steel pipes shall be c
28、arried out by visual test on each length of the coated steel pipe. 7.3 Coating thickness inspection The thickness inspection on the polyethylene film for coated steel pipes shall be carried out by measuring one end of each pipe, taking twon lengths from a lot of pipes of the same dimension and manuf
29、acturing. 7.4 Pinhole inspection The pinhole inspection for the coated steel pipe shall be carried out on over-all coated face for each length. The Standard is downloaded from Standard Sharing7.5 Inspection of peeling strength The inspection of peeling strength shall be conducted at one end of 2 le
30、ngths of coated steel pipes taken fron a lot of the same dimension and manufacturing. 8. Marking The coated steel pipes which have passed inspection shall be clearly marked on each length of the pipe with the following information. However, a part of the following items may be omitted by the approva
31、l of the purchaser. (1) Symbol of class (2) Manufacturers name or its abbreviation (3) Symbol of original pipe (4) dimentions of original pipe (5) Year and month of manufacture 9. Packaging Deformed coated steel pipes shall have their outer surfaces protected by an appropriate method if necessary. 10. Report Upon request of the purchaser, the manufacturer shall submit the test results report of the specified items.
