ASME B16.14-2018 pdf – Ferrous Pipe Plugs,Bushings, and Locknuts With Pipe Threads.
Thts Standard covers the following:
(a) pressure-temperature ratings
(b) size
(C) marking
(d) materials
(eJ dimensions and tolerances
(0 threading
(g) pattern taper
2.1 References
Standards and specifications adopted by reference are shown in Mandatory Appendix Lit is not considered practical to identity 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 I.
2.2 QuaLity Systems
Requirements relating to the product manufacturer’s quality system program are described in Nonmandatory 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 siparately as standard, Within the text, the U.S. Customary units are shown in parentheses. The values stated in each system are not exact equivalents; therefore, it is required that each 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 particular 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 values) are specified shall be as defined In ASTM E29. This requires that an observed or calculated value be rounded off to the nearest unit in the last right-hand digit used for expressing the limit, Decimal
(a) These fittings are furnished in gray iron, malleable iron, ductile Iron. or steel as indicated In the individual tables.
jb) The chemical and mechanical properties of cast material shall equal or exceed those properties listed in ASTM A126, as applicable. Steel castings. forgings. or machined bar properties shall correspond to the comparable ASTM casting material specifications. The fittings manufacturer shall be prepared to certify conformance based on test data.
(a) Dimensions in metric units are given in Tables 7-1 through 7-5 for various types of fittings.
(b) At no point in the component wall shall the metal thickness be less than 90% of the values listed In the tables.
8.1 Thread Form
All threads shall be In accordance with ASM BL2O.1.
8.11 CountersInks and Chamfers. All internal taper pipe threads shall be countersunk or chamfered a distance of not less than one-halt the pitch of the thread at an angle of approximately 45 deg with the axis of the thread. External taper pipe threads shall be chamfered at an angle between 30 deg and 45 deg with the axis, for easier entrance in making a joint and protection of the thread. Countersinking and chamfering shall be concentric with the threads. The length of threads specified in all tables shall be measured to include the countersink or chamfer.
8.1.2 ALignment. The maximum allowable variation in the alignment of threads olall openings shall be 5.0 mm/rn (0.06 in./It).
8.1.3 InternaL Threading. All fittings with internal threads, except locknuts, shall be threaded with ASME 111.20.1 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 111.20.1 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. LocknLlts shall be threaded with ASME
111.20.1 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.
Plug squales or hexagons, raised or countersunk, may have opposite sides tapered a maximum of 4 deg total.