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Any spot facing or back facing shall not reduce the flange thickness to less than the flange thickness specified. When spot facing is used, the diameter shall be large enough to accommodate the outside diameter of the equivalent normal series of washers in accordance with EN ISO 887 for the bolt size being fitted. The bearing surfaces for the bolting shall be parallel to the flange face within the limits given in Table 22. When a flange is back faced a minimum fillet radius, R2 (see Figure 17) in accordance with Table 23 shall be maintained. 5.9 Tolerances Tolerances on dimensions of flanges and collars shall be as given in Table 22. General tolerances for dimensions without given tolerance: According to ISO 2768-1 — c. 5.10 Marking 5.10.1 General marking requirements All flanges, lapped ends and collars, other than type 21 flanges, should be marked as follows: a) flange/collar manufacturer’s name or trade mark, e.g. XXX; b) number of this European Standard, i.e. EN 1092-1; c) flange/collar type number; d) DN, e.g. DN 150;
The marking EN 1092-1, together with the flange manufacturer's name or trademark on or in relation to a product, represents the flange manufacturer's declaration of compliance to this European Standard, i.e. a claim by or on behalf of the flange manufacturer that the product meets the requirements of this European Standard. 5.11 Welding When producing flanges or collars by fusion welding or flanges or collars formed by bending from sections, bar steel or flat products and flash-butt welded the following criteria are valid: welding process/procedures shall be qualified and certified in accordance with EN ISO 15614-1 and EN ISO 15614-13; NOTE Existing valid welding procedures for arc welding of steels i.e. in accordance with EN 288-3 may be used (see introduction to EN ISO 15614-1:2004). welders and/or welding operators shall be qualified in accordance with EN 287-1 and/or EN 1418. All welds shall have full penetration. Local repair of weld seam with filler metal is permitted, provided that the repair procedure/welders are qualified in accordance with the relevant part of the above mentioned standards. If heat treatment is required, the repair welding shall be carried out prior to that.
5.12.1 Inspection and testing of fusion welded joints a) Welded joints shall be visually examined in accordance with !EN ISO 17637" before any other NDT is performed. b) The area to be examined shall include the weld metal and the heat affected zones. c) The required surface examination shall be performed on all the surfaces. d) Any type of NDT shall be performed after any forming or heat treatment operation. Where a material is not sensitive to PWHT cracking (e.g. material groups 1.1 and 8.1 (see CEN ISO/TR 15608)), NDT may be performed before PWHT. e) In case of austenitic base or filler material, the method for surface testing shall be PT. f) Welded pipe as base material shall conform to the relevant product (pipe) standard (see Table 9). g) All other longitudinal welds of necks shall have 100 % volumetric (RT/UT) testing. h) For type 35 only: Every 10th radial weld of rings shall have 100 % volumetric testing. Every 10th ring weld shall have surface crack detection (MT or PT) except in material groups 1.1, 1.2 or 8.1. i) For type 35 only: Welding of neck to ring, every 10th flange shall have surface crack detection of welds (MT or PT).