ASME B16.5 Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard covers pressure-temperature ratings, materials, dimensions, tolerances, marking, testing, and methods of designating openings for pipe flanges and flanged fittings. Included are: (1) flanges with rating class designations 150, 300, 400, 600, 900, and 1500 in sizes NPS 1/2 through NPS 24 and flanges with rating class designation 2500 in sizes NPS 1/2 through NPS 12, with requirements given in both metric and U.S. Customary units with diameter of bolts and flange bolt holes expressed in inch units; (2) flanged fittings with rating class designation 150 and 300 in sizes NPS 1/2 through NPS 24, with requirements given in both metric and U.S. Customary units with diameter of bolts and flange bolt holes expressed in inch units; (3) flanged fittings with rating class designation 400, 600, 900, and 1500 in sizes NPS 1/2 through NPS 24 and flanged fittings with rating class designation 2500 in sizes NPS 1/2 through NPS 12 that are acknowledged in Non-Mandatory Appendix E in which only U.S. Customary units are provided.

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PDF Pages	PDF Title
4	CONTENTS
9	FOREWORD
11	ASME B16 COMMITTEE ROSTER
12	CORRESPONDENCE WITH THE B16 COMMITTEE
14	SUMMARY OF CHANGES
16	LIST OF CHANGES IN RECORD NUMBER ORDER
18	1 SCOPE 1.1 General 1.2 References 1.3 Time of Purchase, Manufacture, or Installation 1.4 User Accountability 1.5 Quality Systems 1.6 Relevant Units 1.7 Selection of Materials 1.8 Convention
19	1.9 Denotation 2 PRESSURE–TEMPERATURE RATINGS 2.1 General 2.2 Flanged Joints 2.3 Ratings of Flanged Joints 2.4 Rating Temperature 2.5 Temperature Considerations
20	2.6 System Hydrostatic Testing 2.7 Welding Neck Flanges 2.8 Straight Hub Welding Flanges 2.8.1 Hub Dimensions. 2.8.2 Length Through Hub. 2.8.3 Bore. 2.8.4 Hub End. 2.9 Multiple Material Grades 3 COMPONENT SIZE 3.1 Nominal Pipe Size 3.2 Reducing Fittings 3.3 Reducing Flanges 4 MARKING 4.1 General
21	4.2 Identification Markings 5 MATERIALS 5.1 General
22	Tables Table 1A List of Material Specifications
25	5.2 Mechanical Properties 5.3 Bolting 5.4 Gaskets 6 DIMENSIONS 6.1 Flanged Fittings Wall Thickness
26	Table 1B List of Bolting Specifications: Applicable ASTM Specifications
27	6.2 Fitting Center-to-Contact Surface and Center-to-End 6.3 Flat Face Flanges 6.4 Flange Facings
28	6.5 Flange Bolt Holes 6.6 Bolting Bearing Surfaces 6.7 Welding End Preparation for Welding Neck Flanges
29	6.8 Reducing Flanges 6.9 Threaded Flanges 6.10 Flange Bolting Dimensions 6.11 Gaskets for Line Flanges
30	6.12 Auxiliary Connections 7 TOLERANCES 7.1 General 7.2 Center-to-Contact Surfaces and Center-to-End Tolerances Table 1C Flange Bolting Dimensional Recommendations
31	7.3 Facings 7.4 Flange Thickness 7.5 Welding End Flange Ends and Hubs 7.6 Length Through Hub on Welding Neck Flanges 7.7 Flange Bore Diameter
32	7.8 Drilling and Facing 8 PRESSURE TESTING 8.1 Flange Test 8.2 Flanged Fitting Test Figures Figure 1 Bevel for Outside Thickness
33	Figure 2 Bevel for Inside Thickness Figure 3 Bevel for Combined Thickness Figure 4 Straight Hub Welding Flanges
34	Figure 5 Method of Designating Outlets of Reducing Fittings in Specifications (Flanged Fittings)
35	Figure 6 End Flange Facings and Their Relationship to Flange Thickness and Center-to-End and End-to-End Dimensions
37	Figure 7 Bevel for Wall Thicknesses t From 5 mm to 22 mm Inclusive Figure 8 Bevel for Wall Thicknesses t Greater Than 22 mm
38	Figure 9 Inside Contour for Use With Rectangular Backing Ring Figure 10 Inside Contour for Use With Taper Backing Ring
39	Figure 11 Thread Length for Connection Tapping Figure 12 Socket Welding for Connections Figure 13 Bosses for Connections Figure 14 Butt Welding for Connections
40	Figure 15 Method of Designating Location of Auxiliary Connections When Specified (Flanged Fittings)
41	Table 2-1.1 Pressure–Temperature Ratings for Group 1.1 Materials
42	Table 2-1.2 Pressure–Temperature Ratings for Group 1.2 Materials
43	Table 2-1.3 Pressure–Temperature Ratings for Group 1.3 Materials
44	Table 2-1.4 Pressure–Temperature Ratings for Group 1.4 Materials
45	Table 2-1.5 Pressure–Temperature Ratings for Group 1.5 Materials
46	Table 2-1.7 Pressure–Temperature Ratings for Group 1.7 Materials
47	Table 2-1.9 Pressure–Temperature Ratings for Group 1.9 Materials
48	Table 2-1.10 Pressure–Temperature Ratings for Group 1.10 Materials
49	Table 2-1.11 Pressure–Temperature Ratings for Group 1.11 Materials
50	Table 2-1.13 Pressure–Temperature Ratings for Group 1.13 Materials
51	Table 2-1.14 Pressure–Temperature Ratings for Group 1.14 Materials
52	Table 2-1.15 Pressure–Temperature Ratings for Group 1.15 Materials
53	Table 2-1.17 Pressure–Temperature Ratings for Group 1.17 Materials
54	Table 2-1.18 Pressure–Temperature Ratings for Group 1.18 Materials
55	Table 2-2.1 Pressure–Temperature Ratings for Group 2.1 Materials
56	Table 2-2.2 Pressure–Temperature Ratings for Group 2.2 Materials
57	Table 2-2.3 Pressure–Temperature Ratings for Group 2.3 Materials
58	Table 2-2.4 Pressure–Temperature Ratings for Group 2.4 Materials
59	Table 2-2.5 Pressure–Temperature Ratings for Group 2.5 Materials
60	Table 2-2.6 Pressure–Temperature Ratings for Group 2.6 Materials
61	Table 2-2.7 Pressure–Temperature Ratings for Group 2.7 Materials
62	Table 2-2.8 Pressure–Temperature Ratings for Group 2.8 Materials
63	Table 2-2.9 Pressure–Temperature Ratings for Group 2.9 Materials
64	Table 2-2.10 Pressure–Temperature Ratings for Group 2.10 Materials
65	Table 2-2.11 Pressure–Temperature Ratings for Group 2.11 Materials
66	Table 2-2.12 Pressure–Temperature Ratings for Group 2.12 Materials
67	Table 2-3.1 Pressure–Temperature Ratings for Group 3.1 Materials Table 2-3.2 Pressure–Temperature Ratings for Group 3.2 Materials
68	Table 2-3.3 Pressure–Temperature Ratings for Group 3.3 Materials
69	Table 2-3.4 Pressure–Temperature Ratings for Group 3.4 Materials
70	Table 2-3.5 Pressure–Temperature Ratings for Group 3.5 Materials
71	Table 2-3.6 Pressure–Temperature Ratings for Group 3.6 Materials
72	Table 2-3.7 Pressure–Temperature Ratings for Group 3.7 Materials
73	Table 2-3.8 Pressure–Temperature Ratings for Group 3.8 Materials
74	Table 2-3.9 Pressure–Temperature Ratings for Group 3.9 Materials
75	Table 2-3.10 Pressure–Temperature Ratings for Group 3.10 Materials Table 2-3.11 Pressure–Temperature Ratings for Group 3.11 Materials
76	Table 2-3.12 Pressure–Temperature Ratings for Group 3.12 Materials Table 2-3.13 Pressure–Temperature Ratings for Group 3.13 Materials
77	Table 2-3.14 Pressure–Temperature Ratings for Group 3.14 Materials
78	Table 2-3.15 Pressure–Temperature Ratings for Group 3.15 Materials
79	Table 2-3.16 Pressure–Temperature Ratings for Group 3.16 Materials
80	Table 2-3.17 Pressure–Temperature Ratings for Group 3.17 Materials
81	Table 2-3.19 Pressure–Temperature Ratings for Group 3.19 Materials
82	Table 3 Permissible Imperfections in Flange FacingFinish for Raised Face and Large Male and FemaleFlanges
83	Table 4 Dimensions of Facings (Other Than Ring Joints, All Pressure Rating Classes)
85	Table 5 Dimensions of Ring Joint Facings (All Pressure Rating Classes)
92	Table 6 Reducing Threaded and Slip-On Pipe Flanges for Classes 150 Through 2500 Pipe Flanges
93	Table 7 Templates for Drilling Class 150 Pipe Flanges and Flanged Fittings
94	Table 8 Dimensions of Class 150 Flanges
97	Table 9 Dimensions of Class 150 Flanged Fittings
102	Table 10 Templates for Drilling Class 300 Pipe Flanges and Flanged Fittings
103	Table 11 Dimensions of Class 300 Flanges
107	Table 12 Dimensions of Class 300 Flanged Fittings
110	Table 13 Templates for Drilling Class 400 Pipe Flanges
111	Table 14 Dimensions of Class 400 Flanges
113	Table 15 Templates for Drilling Class 600 Pipe Flanges and Flanged Fittings
114	Table 16 Dimensions of Class 600 Flanges
116	Table 17 Templates for Drilling Class 900 Pipe Flanges and Flanged Fittings
117	Table 18 Dimensions of Class 900 Flanges
119	Table 19 Templates for Drilling Class 1500 Pipe Flanges
120	Table 20 Dimensions of Class 1500 Flanges
122	Table 21 Templates for Drilling Class 2500 Pipe Flanges
123	Table 22 Dimensions of Class 2500 Flanges
125	MANDATORY APPENDICES MANDATORY APPENDIX I THREADING OF PIPE FOR AMERICAN NATIONAL STANDARD THREADED FLANGES
126	Table I-1 Projection of Threaded Pipe End Through a Ring Gage
127	MANDATORY APPENDIX II PRESSURE–TEMPERATURE RATINGS AND DIMENSIONAL DATA FOR CLASSES 150, 300, 400, 600, 900, 1500, AND 2500 FLANGES AND CLASSES 150 AND 300 FLANGED FITTINGS IN U.S. CUSTOMARY UNITS
128	Figure II-6 End Flange Facings and Their Relationship to Flange Thickness and Center-to-End and End-to-End Dimensions
130	Figure II-7 Bevel for Wall Thicknesses t From 0.19 in. to 0.88 in. Inclusive Figure II-8 Bevel for Wall Thicknesses t Greater Than 0.88 in.
131	Figure II-9 Inside Contour for Use With Rectangular Backing Ring Figure II-10 Inside Contour for Use With Taper Backing Ring
132	Figure II-11 Thread Length for Connection Tapping Figure II-12 Socket Welding for Connections Figure II-13 Bosses for Connections Figure II-14 Butt Welding for Connections
133	Table II-2-1.1 Pressure–Temperature Ratings for Group 1.1 Materials
134	Table II-2-1.2 Pressure–Temperature Ratings for Group 1.2 Materials
135	Table II-2-1.3 Pressure–Temperature Ratings for Group 1.3 Materials
136	Table II-2-1.4 Pressure–Temperature Ratings for Group 1.4 Materials
137	Table II-2-1.5 Pressure–Temperature Ratings for Group 1.5 Materials
138	Table II-2-1.7 Pressure–Temperature Ratings for Group 1.7 Materials
139	Table II-2-1.9 Pressure–Temperature Ratings for Group 1.9 Materials
140	Table II-2-1.10 Pressure–Temperature Ratings for Group 1.10 Materials
141	Table II-2-1.11 Pressure–Temperature Ratings for Group 1.11 Materials
142	Table II-2-1.13 Pressure–Temperature Ratings for Group 1.13 Materials
143	Table II-2-1.14 Pressure–Temperature Ratings for Group 1.14 Materials
144	Table II-2-1.15 Pressure–Temperature Ratings for Group 1.15 Materials
145	Table II-2-1.17 Pressure–Temperature Ratings for Group 1.17 Materials
146	Table II-2-1.18 Pressure–Temperature Ratings for Group 1.18 Materials
147	Table II-2-2.1 Pressure–Temperature Ratings for Group 2.1 Materials
148	Table II-2-2.2 Pressure–Temperature Ratings for Group 2.2 Materials
149	Table II-2-2.3 Pressure–Temperature Ratings for Group 2.3 Materials
150	Table II-2-2.4 Pressure–Temperature Ratings for Group 2.4 Materials
151	Table II-2-2.5 Pressure–Temperature Ratings for Group 2.5 Materials
152	Table II-2-2.6 Pressure–Temperature Ratings for Group 2.6 Materials
153	Table II-2-2.7 Pressure–Temperature Ratings for Group 2.7 Materials
154	Table II-2-2.8 Pressure–Temperature Ratings for Group 2.8 Materials
155	Table II-2-2.9 Pressure–Temperature Ratings for Group 2.9 Materials
156	Table II-2-2.10 Pressure–Temperature Ratings for Group 2.10 Materials
157	Table II-2-2.11 Pressure–Temperature Ratings for Group 2.11 Materials
158	Table II-2-2.12 Pressure–Temperature Ratings for Group 2.12 Materials
159	Table II-2-3.1 Pressure–Temperature Ratings for Group 3.1 Materials Table II-2-3.2 Pressure–Temperature Ratings for Group 3.2 Materials
160	Table II-2-3.3 Pressure–Temperature Ratings for Group 3.3 Materials Table II-2-3.4 Pressure–Temperature Ratings for Group 3.4 Materials
161	Table II-2-3.5 Pressure–Temperature Ratings for Group 3.5 Materials
162	Table II-2-3.6 Pressure–Temperature Ratings for Group 3.6 Materials
163	Table II-2-3.7 Pressure–Temperature Ratings for Group 3.7 Materials
164	Table II-2-3.8 Pressure–Temperature Ratings for Group 3.8 Materials
165	Table II-2-3.9 Pressure–Temperature Ratings for Group 3.9 Materials
166	Table II-2-3.10 Pressure–Temperature Ratings for Group 3.10 Materials Table II-2-3.11 Pressure–Temperature Ratings for Group 3.11 Materials
167	Table II-2-3.12 Pressure–Temperature Ratings for Group 3.12 Materials Table II-2-3.13 Pressure–Temperature Ratings for Group 3.13 Materials
168	Table II-2-3.14 Pressure–Temperature Ratings for Group 3.14 Materials
169	Table II-2-3.15 Pressure–Temperature Ratings for Group 3.15 Materials
170	Table II-2-3.16 Pressure–Temperature Ratings for Group 3.16 Materials Table II-2-3.17 Pressure–Temperature Ratings for Group 3.17 Materials
171	Table II-2-3.19 Pressure–Temperature Ratings for Group 3.19 Materials
172	Table II-3 Permissible Imperfections in Flange FacingFinish for Raised Face and Large Male and FemaleFlanges
173	Table II-4 Dimensions of Facings (Other Than Ring Joints, All Pressure Rating Classes)
175	Table II-5 Dimensions of Ring Joint Facings (All Pressure Rating Classes)
182	Table II-6 Reducing Threaded and Slip-On Flanges for Classes 150 Through 2500 Pipe Flanges
183	Table II-7 Templates for Drilling Class 150 Pipe Flanges and Flanged Fittings
184	Table II-8 Dimensions of Class 150 Flanges
187	Table II-9 Dimensions of Class 150 Flanged Fittings
190	Table II-10 Templates for Drilling Class 300 Pipe Flanges and Flanged Fittings
191	Table II-11 Dimensions of Class 300 Flanges
195	Table II-12 Dimensions of Class 300 Flanged Fittings
198	Table II-13 Templates for Drilling Class 400 Pipe Flanges
199	Table II-14 Dimensions of Class 400 Flanges
201	Table II-15 Templates for Drilling Class 600 Pipe Flanges and Flanged Fittings
202	Table II-16 Dimensions of Class 600 Flanges
204	Table II-17 Templates for Drilling Class 900 Pipe Flanges and Flanged Fittings
205	Table II-18 Dimensions of Class 900 Flanges
207	Table II-19 Templates for Drilling Class 1500 Pipe Flanges
208	Table II-20 Dimensions of Class 1500 Flanges
210	Table II-21 Templates for Drilling Class 2500 Pipe Flanges
211	Table II-22 Dimensions of Class 2500 Flanges
212	MANDATORY APPENDIX III REFERENCES
215	NONMANDATORY APPENDICES NONMANDATORY APPENDIX A METHOD USED FOR ESTABLISHING PRESSURE–TEMPERATURE RATINGS A-1 GENERAL CONSIDERATIONS
216	A-2 PRESSURE–TEMPERATURE RATING METHOD
217	A-3 MAXIMUM RATINGS
218	Table A-1 Rating Ceiling Pressure — pc, bar
219	Table A-2 Rating Ceiling Pressure — pc, psi
220	NONMANDATORY APPENDIX B LIMITING DIMENSIONS OF GASKETSOTHER THAN RING JOINT GASKETS B-1 GASKET MATERIALS AND CONSTRUCTION B-2 GASKET DIMENSIONS
221	Table B-1 Gasket Groups and Typical Materials
222	NONMANDATORY APPENDIX C METHOD FOR CALCULATING BOLT LENGTHS1The equations used in this Nonmandatory Appendix are for calculated bolt lengths established to ensure full thread engagement of heavy hexagon nuts when worst case tolerances occur on all relevant dimensions of the flanged joint. The use of shorter bolt lengths is acceptable provided that full thread engagement is obtained at assembly (see para. 6.10.2).
223	Figure C-1 Specified Machine Bolt Length Figure C-2 Specified Stud Bolt Length Table C-1 Thickness for Lapped Joints Table C-2 F Values Table C-3 n Values
224	NONMANDATORY APPENDIX D QUALITY SYSTEM PROGRAM
225	NONMANDATORY APPENDIX E DIMENSIONS OF CLASSES 400, 600, 900, 1500, AND 2500 FLANGED FITTINGS IN U.S. CUSTOMARY UNITS
227	Table E-1 Dimensions of Class 400 Flanged Fittings
233	Table E-2 Dimensions of Class 600 Flanged Fittings
239	Table E-3 Dimensions of Class 900 Flanged Fittings
245	Table E-4 Dimensions of Class 1500 Flanged Fittings
251	Table E-5 Dimensions of Class 2500 Flanged Fittings

Published By	Publication Date	Number of Pages
ASME	2017	254


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Standard Title	ASME B16.5 Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard
Published Code	ASME
Publication Date	2017
Pages Count	254

ASME B16.5 2017

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