ASME B1.20.3 1976 R2023

$98.04

ASME B1.20.3-1976-R2023 Dryseal Pipe Threads,Inch

Published By	Publication Date	Number of Pages
ASME	1976

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Description

Dryseal pipe threads are based on the USA (American) pipe thread, however, they differ from the USA (American) pipe thread in that they are designed to seal pressure-tight joints without the necessity of using sealing compounds. To accomplish this some modification of thread from and greater accuracy in manufacture is required. The roots of both the external and internal threads are truncated slightly more than the crests, i.e. roots have wider flats than crest, so that metal-to-metal contact occurs at the crests and roots coincident with or prior to flank contact, see Figure 1. Thus as the threads are assembled by wrenching, the roots of the threads crush the sharper crests of the mating threads. This sealing action at both the major and minor diameters tends to prevent spiral leakage and makes the joints pressure tight without the necessity of using sealing compounds, provided that the mating threads are in accordance with standard specifications and tolerances and are not damaged by galling in assembly. The control of crest and root truncation is simplified by the use of properly designed threading tools. Also, it is desirable that both external and internal threads have full thread height for the L1 length. However, where not functionally objectionable, the use of a compatible lubricant or sealant may be used to minimize the possibility of galling. This is desirable in assembling Dryseal Pipe Threads in refrigeration and other systems to effect a pressure tight seal.

PDF Catalog

PDF Pages	PDF Title
9	CONTENTS
11	Section 1 Product Threads 1.1 Introduction
12	1.2 Thread Types Figures 1 Extreme Mating Conditions for Dryseal Pipe Threads
13	1.3 Thread Designations and Notation 1.3.1 NPTF Thread Class 1.3.2 Designation of Plated Threads 1.4 Applications 1.4.1 Type 1.4.1.1 NPTF 1.4.1.2 PTF-SAE Short
14	1.4.1.3 NPSF 1.4.1.4 NPSI 1.4.2 Class 1.4.2.1 NPTF Class 1 1.4.2.2 NPTF Class 2 1.5 Assembly Limitations 1.6 Thread Form and Tolerance
15	Tables 1 Recommended Limitations of Assembly Among the Various Types of Dryseal Threads 2 Reference Dimensions for Assembled Engagement of Dryseal Pipe Threads
16	2 Thread Form and Limits on Root and Crest Tuncation of Product Threads
17	1.7 Basic Dimensions 1.7.1 NPTF Threads 3 Basic Dimensions for NPTF Threads
18	1.7.2 PTF-SAE SHORT, External Threads 4 Basic Dimensions for PTF-SAE SHORT, External Threads
19	1.7.3 PTF-SAE SHORT, Internal Threads 5 Basic Dimensions for PTF-SAE Short, Internal Threads
20	1.7.4 NPSF Threads 1.7.5 NPSl Threads 6 Dimensional Data for NPSF Threads 7 Dimensional Data for NPSI Threads
21	Appendix A Letter Symbols and Formulas A.1 Symbols Designating the Dimensions of Pipe Threads A.2 Formulas for Diameter and Length of Thread
22	A1 Pipe Thread Symbols
23	A1 Application of Pipe Thread Symbols
24	Appendix B Suggested Tap Drill Sizes for Internal Dryseal Pipe Threads B1 Suggested Tap Drill Sizes For Internal Dryseal Pipe Threads
25	Appendix C Special Short, Special Extra Short, Fine, and Special Diameter-Pitch Combination Dryseal Pipe Threads C.1 Dryseal Special Short Taper Pipe Thread, PTF-SPL SHORT C.2 Dryseal Special Extra Short Taper Pipe Thread, PTF-SPL EXTRA SHORT C.3 Limitations of Assembly
26	C.4 Dryreal Fine Taper Thread Series, F-PTF C.5 Dryseal Special Diameter-Pitch Combination Series, SPL-PTF C.6 Formulas for Diameter and Length of Thread C.7 Designations
27	C1 Comparison of Special Dryseal Threads with Standard Length Dryseal Threads
28	C1 Basic Dimensions of Dryseal Fine Taper Pipe Thread, F-PTF
29	C2 Basic Dimensions of Dryseal Special Taper Pipe Thread, SPL-PTF (For Thin Wall Nominal Size OD Tubing)