ASME B16.1-2005 pdf download
ASME B16.1-2005 pdf download.Gray lron Pipe Flanges and Flanged Fittings.
This Standard covers Classes 25, 125, and 250 Gray Iron Pipe Flanges and Flanged Fittings. It includes:
(a) pressure-temperature ratings;
(b) sizes and method of designating openings of reducing fittings;
(c) marking;
(d) materials;
(e) dimensions and tolerances;
(if) bolting and gaskets;
‘g) pressure testing.
1.2 References
Standards and specifications adopted by reference in this Standard are shown in Appendix II, which is part of this Standard. It is not considered practical to identify the specific edition of each referenced standard and specification in the text, when referenced. Instead, the specific editions of the referenced standards and specifications are listed in Appendix II.
1.3 Quality Systems
Requirements relating to the product manufacturer’s Quality System Programs are described in Appendix A.
1.4 Relevant Units
This Standard states values in both SI and U.S. Customary units. As an exception, diameter of bolts and flange bolt holes are expressed in inch units only. These systems of units are to be regarded separately. Within the text, the U.S. Customary units are shown in parenthesis or in separate tables. The values stated in each table are not exact equivalents; therefore it is required that each system of units be used independently of the other. Except for diameter of bolts and flange bolt holes, combining values from the two systems constitutes nonconformance with the standard.
1.5 Service Conditions
Criteria for selection of materials suitable for particular fluid service are not within the scope of this Standard.
1.6 Convention
For the purpose of determining conformance with this Standard, the convention for fixing significant digits where limits, maximum and minimum values are specified, shall be rounded as defined in ASTM E 29.
6.8 Crosses and Lateral Reinforcement
Crosses and laterals (Y-branches) both straight and reducing shall be reinforced where necessary to compensate for the inherent weakness in the shape of these fittings.
6.9.2 Location Designation. The method of designating the locations of the tapped holes for drains is shown in Fig. 11. Each location is designated by a letter so that desired locations for the various types of fittings may be definitely specified without the use of further sketches or description. For further tapping details, see
MSS SP-45.
7 BOLT, NUT, AND GASKET DIMENSIONS
7.1 Bolting
(a) It is recommended that carbon steel bolts smaller than 3/4 in. have (ASME B18.2.1) square heads or (ASME B18.2.1) heavy hex heads, and shall have (ASME B18.2.2) heavy hex nuts.
(b) Carbon steel bolts 34 in. and larger shall have (ASME B18.2.l) square heads or (ASME B18.2.1) hex heads and shall have (ASME B 18.2.2) hex nuts or (ASME B18.2.2) heavy hex nuts or (ASME B18.2.2) square nuts. For bolt sizes 11/2 in. and larger, stud bolts with a nut on each end are recommended.
(c) All bolts or (stud bolts) and all nuts shall be threaded in accordance with the Unified Screw Threads, standard coarse thread series (ASME B1.1) with Class 2A for bolts and Class 2B for nuts.
7.2 Gaskets
It is recommended that flat ring gaskets be in accordance with dimensions given in ASME B16.21 for nonmetallic gaskets for pipe flanges.
8 HYDROSTATIC TESTS
(a) Pressure testing is not required unless specified by the user.
(b) Fittings. Fittings shall be capable of withstanding, without showing leaks, the hydrostatic test pressures listed in Table I for the material and maximum allowable working pressure of the item tested. These test pressures are 1.5 times the cold working pressure rate rounded to the next higher 0.5 bar (12 psi) in Table 1.
(c) Flanges. Flanges integral with or attached to equipment may be hydrostatically tested by the purchaser at his responsibility at pressures higher than specified herein.
9 CERTIFICATIONS
The manufacturer shall be able to certify that products are in conformance with the requirements of this Standard when required by the purchase order.
