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Tapered threaded fittings are sometimes used on plastic piping. Due to the wedging effect of the tapered thread, extreme care must be used to avoid overtightening the joint. The overstressed female fitting may split days, weeks, or even years after initial installation. Therefore many municipal
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Especially precise threads are known as "dry fit" or "dry seal" and require no sealant for a gas-tight seal. Such threads are needed where the sealant would contaminate or react with the media inside the piping, e.g., oxygen service.
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standards specify a thread taper of 1:16; the change in diameter is one sixteenth the distance travelled along the thread. The nominal diameter is achieved some small distance (the "gauge length") from the end of the pipe.
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effect, which may not be enough to satisfy either functional or code requirements. Instead, an O-ring seated between the shoulder of the male pipe section and an interior surface on the female, provides the seal.
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created by the threads; a positive seal between the threads created by thread deformation when they are tightened to the proper torque; and sometimes on the presence of a sealing
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Pipes may also be threaded with cylindrical threaded sections, in which case the threads do not themselves provide any sealing function other than some
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The threaded pipes used in some plumbing installations for the delivery of gases or liquids under pressure have a tapered thread that is slightly
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8:
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A threaded pipe plug; note that the threaded portion is tapered and so touches the
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66:). The seal provided by a threaded pipe joint depends upon multiple factors: the
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58:(in contrast to the parallel sided cylindrical section commonly found on
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plumbing codes restrict the use of threaded plastic pipe fittings.
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21:
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82:. Tapered thread joints typically do not include a
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78:or a liquid or paste pipe sealant such as
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244:
172:Panzergewinde (steel conduit thread)
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13:
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14:
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215:NPT Vs. NPTF Taper Pipe Threads
1:
202:United States Standard thread
7:
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10:
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25:
135:British Standard Pipe
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156:National pipe thread
103:National pipe thread
40:ends for assembly.
24:at only two points.
151:Garden hose thread
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220:Newman Tools Inc.
162:Nipple (plumbing)
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224:J.W. WINCO, INC.
167:O-ring boss seal
146:Fire hose thread
110:Straight threads
99:British standard
76:thread seal tape
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141:Buttress thread
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44:Tapered threads
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11:
5:
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209:External links
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116:labyrinth seal
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68:labyrinth seal
50:Tapered thread
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38:screw-threaded
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30:threaded pipe
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18:
238:pipe thread.
197:Thread angle
187:Screw thread
137:thread (BSP)
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29:
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192:Tap and die
246:Categories
74:, such as
64:leadscrews
48:See also:
228:Whitworth
226:show the
130:AN thread
80:pipe dope
257:Plumbing
182:Plumbing
123:See also
22:calipers
72:coating
56:conical
252:Piping
177:Piping
84:gasket
230:form
158:(NPT)
97:Both
60:bolts
36:with
32:is a
222:and
101:and
62:and
34:pipe
236:ISO
234:or
232:BSP
248::
86:.
28:A
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