ge marking and marking sample
1, National Institute of Standards tags: flange should be nominal diameter, nominal pressure, the sealing surface forms of code, with steel used in series of code (with rice tube, code-named "Series 2", equipped with the British controls are not marked) and standard No. to tag.
Tag example: DN 80mm, nominal pressure 4.0MPa (25bar) of the convex welded steel pipe flange (with rice pipe)
Flange DN80-PN40 M (Series 2) GB/T9115.2-2000, nominal diameter 100mm, nominal pressure 5.0MPa (25bar) face of sudden neck flat welded steel pipe with a flange (equipped with the British tube) flange DN100-PN50 RF GB/T9116.1-2000.
2, Ministry of Machinery Standard Tag:
Tag example: nominal diameter 500mm, nominal pressure 1.6MPa, Series 2 of the sudden face flat welded steel pipe flange
Flange 500-16 JB/T81-94
Nominal diameter 300mm, nominal pressure 6.4MPa, Series 1 of the concave welded steel pipe flange
Flange 300-64B (Series 1) JB/T82.2-94
(Note: The Ministry of Machinery standard default pipe diameter series 2, welded flange Category: A-type convex, B-type concave, C-type tenon face, D-groove surface)
3, Ministry of Chemical Industry Standard Tag: flange should be marked the following provisions (recommended use of such marking method)
a, Standard No.: various types of pipe flanges are based on the criteria of this standard, United markup: HG20592.
b, flange type code according to the requirements in Table 5.0.1.
Threaded flange in accordance with the provisions of the tapered pipe thread GB/T7306 when marked as "Th (Rc)" or "Th (Rp)";
Threaded flange in accordance with the provisions of the tapered pipe thread GB/T12716 when marked as "Th (NPT)";
Threaded flange threaded code without markup, compared with Rp (GB/T7306.1).
c, flange nominal diameter DN (mm) diameter steel pipe with the application of series:
Overall flange, flange cover, lining flange cover, threaded flange, applicable tube outer diameter range of marks can be omitted;
Apply internationally accepted series of steel pipe (commonly known as British tube) of the flange, mark "DN (A)";
Applicable to domestic follow the series of pipe (commonly known as metric tube) of the flange, marked as "DN (B)".
d, flange nominal pressure PN, MPa.
e, sealing surface forms in Table 6.0.1, code-named according to the provisions of the Tunisian side flanges, such as car system, dense grain waterline, then marked as "RF (A)".
f, by the users of the steel pipe wall thickness.
Belt neck butt welding flange, butt welding flange ring-song set of pipe wall thickness should be marked.
g, material grades.
h, other. Uses inconsistent with the provisions of this standard series of requirements or additional requirements, such as the sealing surface of the surface roughness.
Tag example:
DN 1200mm, nominal pressure 0.6MPa, equipped with the metric-style flat panel sudden pipe welded steel pipe flange, material Q235A
HG20592 Flange PL1200 (B) -0.6 RF Q235A
Nominal diameter 300mm, nominal pressure 2.5MPa, equipped with British pipe convex neck flat welded steel pipe with a flange, material 20 steel
HG20592 Flange SO300 (A) -2.5 M 20
Nominal diameter 150mm, nominal pressure 16.0MPa, with ring of pipes connected with the British side with a neck welded steel pipe flange, material 16Mn, pipe wall thickness of 10mm
HG20592 Flange WN150 (A) -16.0 RJ S = 10mm 16Mn
Nominal diameter 200mm, nominal pressure of 1.0MPa, with suddenly faced with the metric pipe welded steel pipe flange ring-song set of material as follows: flange 20, welded rings 316, pipe wall thickness of 4mm
HG20592 Flange PJ/SE200 (B) -1.0 RF S = 4mm 20/316
