API STD 677:2006 pdf download

API STD 677:2006 pdf download.General-Purpose Gear Units for Petroleum, Chemical and Gas
Industry Services.
2.6.2 Lube-oil Connections
• 2.6.2.1 Lube-oil inlet and drain connections, oriented as specified, shall be at least DN 20 (314-in. NPS) and shall be flanged or machined and studded. Where flanged or machined and studded openings are impractical, threaded openings in sizes DN 20 (NPS 3/4) through DN 40 (NPS 1 1/2) are permissible. These threaded openings shall be installed as specified as follows:
a. A pipe nipple, preferably not more than 150mm (6 in.) long, shall be screwed into the threaded opening.
b. Pipe nipples shall be a minimum of Schedule 160 seamless for DN 25 (NPS 1) and smaller and a minimum of Schedule 80 for
DN4O(NPS 1/2).
c. The pipe nipple shall be provided with a welding-neck or socket-weld flange.
d. The threaded connection shall be seal welded; however, seal welding is not permitted on cast iron equipment, for instrument
connections, or where disassembly is required for maintenance. Seal-welded joints shall he in accordance with ASME B3l.3.
e. Tapped openings and bosses for pipe threads shall conform to ISO 7-1 (ASME B 16.5).
f. Pipe threads shall be taper threads conforming to ASME B 1 .20. 1.
2.6.2.2 Tapped openings not connected to piping shall he plugged with solid plugs furnished in accordance with ASME B 16.11. Plugs that may later require removal shall be of corrosion-resistant material. Threads shall be lubricated. Tape shall not be applied to threads of plugs inserted into oil passages. Plastic plugs are not permitted.
• 2.6.2.3 Flanges shall conform to ISO 7005-I, Series 1, including Annex D & E or ISO 7005-2, Series I or ASME B 16.1, B 16.5, and B 16.42 as specified, except as specified in 2.6.2.3.2 and 2.6.2.3.3.
Note 1: ISO 7005-1 (steel flanges) PN 20, 50, 110. 150. 260.420 are designed to be interchangeable with ASME B 16.5 and MSS SP-44 flanges, ISO 7005-1 flanges are not identical to ASME B 16.5 and MSS SP 44 but are deemed to comply with the dimensions specified in ASME B 16.5 and MSS SP44.
Note: ISO 7005-2 (cast iron) flanges PN 20.50 are designed to be interchangeable with ANSI/ASME B 16.1 (gray cast iron) and B 16.42 (ductile cast iron) hut they are not identical. They are deemed to comply with dimensions specified in ASME B 16.1 (gray cast iron) and B 16.42 (ductile cast iron).
Note 2: ISO PN 2.5, 6 do not have a corresponding ASME class and ASME Class 75, 400 & 800 do not have corresponding ISO PN designation. The usc of these PN and Class flange ratings therefore not recommended.
2.6.2.3.1 When ISO 7005-1 has been specified materials shall he in accordance with Annex D-l (DIN) or Annex D-2 (ASTM), as specified. The pressure temperature ratings in Appendix E shall correspond to the materials specified.
Note: 150 7005-1 Annex F Table 1-4 covers D- I materials and Table 5-21 covers D-2 materials.
• 2.6.2.3.2 Gray, malleable, ductile, and cast iron flanges shall be flat faced and conform to the dimensional requirements of ISO 7005-2, ASME B 16.1 or 16.42, as specified. PN 20 (Class 125) flanges shall have a minimum thickness equal to PN 50 (Class
250) for sizes DN 200 (8 NPS) and smaller.
Flanges other than those covered in 7005-2. shall conform to the dimensional requirements of the flanges specified in 2.6.2.3.
• 2.6.2.3.3 Purchaser connections other than those covered by ISO 7(X)5-1, ISO 7005-2, ASME B 16.1 or ASME B 16.5 require purchaser’s approval. When specified, mating parts shall be furnished by the vendor.
• 2.6.2.4 Machined and studded connections shall conform to the facing and drilling requirements of ISO 7005-1, ISO 7005-2, ASME B 16.1, B 16.5 or B 16.42, as specified. Studs and nuts shall be provided installed. The first 11/2 threads at both ends of each stud shall be removed.
Machined and studded connections and flanges not in accordance with ISO 7005-1, 7005-2, ASME B 16.1, B 16.5, B 16.42 require purchaser’s approval. Unless otherwise specified, the vendor shall supply mating flanges, studs and nuts for these nonstandard connections.
2.6.2.5 Flanges shall he full faced or spot faced on the back and shall he designed for through bolting.
2.6.2.6 The flange gasket contact surface shall not have mechanical damage which penetrates the root of the grooves for a radial length of more than 30% of the gasket contact width.
For all steel flanges, imperfections in the flange face finish shall not exceed that permitted in ASME 16.5.
2.6.2.7 Alternative flange connections (e.g.. those of SAE) are permitted for nonpurchaser connections unless otherwise specified.