ASME B16.14-2013 pdf – Ferrous Pipe Plugs,Bushings, and Locknuts With Pipe Threads.
This Standard covem the following:
(a) pressure—temperature ratings
(b) size
c) marking
(d materials
(e) dimensions and tolerances
(I) threading
(g pattern taper
2 GENERAL
2.1 References
Standards and specIfications adopted by relerence are shown in Mandator)r Appendix 11 It is not considered practical to identify the edition of each referenced standard and specification in the text. Instead, the editions of the referenced standards and specifications are listed in Mandatory Appendix II.
2.2 Quality Systems
Requirements relating to the product manufacturer’s quality system programs are described in Nonniandatory Appendix A.
2.3 ReLevant Units
This Standard states values in both SI (Metric) units and U.S. Customary units. These systems of units are to be regarded separately as standard. Within the text. the US. Customary units are shown in parentheses or in separate tables that appear in Mandatory Appendix I. The values stated in each system are not exact equiva. lents; therefore, it is required that e’ach system of units be used independently of the other. Combining values from the two systems constitutes nonconformance with the Standard.
2.4 Service Conditions
Criteria for selection of materials suitable for particubr fluid service are not within the scope of this Standard.
2.5 Convention
For determining conformance with this Standard, the convention for fixing significant digits where limits (maximum and minimum sralues) are specified shall be as defined in ASTM E29. This requires that an observed or calculated value be munded off to the nearest unit in the last right-hand digit Lised for expressing the limit. Decimal values and tolerances do not imply a particular method of measurement.
2.6 Denotation
2.6.1 Pressure Rating Designation. Class followed by a dimensionless number is the designation for pressure—temperature ratings.
2.6.2 Size. Nominal pipe size (NI’S) followed by a dimensionless number is the designation for nominal flange or flange fitting size. NI’S Lx related to the reference nominal diameter. DN, used in international standards. The relationship is, typically. as follows:
for easier entrance In making a joint and pmtection of the thread. Countersrnking and chamfering shall be concentric with the threads. The length of threads specified in all table,, shall be measured to include the countersrnk or chamfer.
8.1.2 AlIgnment. The maximum allowable variation in the alignment of threads of all openings shall be 5.0 mm/ni (0.06 In/It).
8.1.3 Internal Threading. All fittings with internal threads, except locknuts, shall be threaded with ASME B1.20.1 NPT threads. The reference point for gaging is the starting end of the fitting. provided the chamfer does not exceed the major diameter of the internal thread. When a chamfer on the internal thread exceeds this limit, the reference point becomes the last thread scratch on the chamfer cone.
8.1.4 External Threading. All externally threaded fittings shall be threaded with ASME 131.201 NPT threads. The reference point for gaging is the end of the thread, provided the chamfer is not smaller than the minor diameter of the external thread. When a chamfer on the external thread exceeds this limit, the reference point becomes the last thread scratch on the chamfer cone.
8.1.5 Locknuts. Loknuts shall be threaded with ASME 81.20.1 NPSL threads.
8.2 GagIng Tolerances
For taper pipe threads, the variation in threading shall be limited to one turn large or small from the gaging notch on the plug or the gaging face of the ring when using working gages,
9 PATTERN TAPER
Plug squares or hexagons. raised or countersunk, may have opposite sides tapered a maximum of 4 deg total.