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	Pipe and Pipe Threads
		There are many pipe thread specifications but they fall into one of two categories: The North American or US Standard and the Rest of the world.
		The dryseal thread differs in that the roots of the threads are slightly more truncated than the crests.
		Originally, the OD of pipe was defined by it's ID. Given a wall thickness suitable to holding the required pressure (using the materials at the time) the OD was determined.
	ranteng.com /pipe_and_threads.htm (575 words)

	pipe threads
		Pipe thread sizes are described much as bolt sizes are, although the shapes are different.
		For example, “½–14 NPT” identifies a pipe thread with a nominal outside diameter of ½ inch and 14 threads to the inch, made according to the NPT standard.
		To accomplish this, the threads become shallower the farther they are from the end of the pipe or fitting.
	www.sizes.com /materls/pipeThrd.htm (263 words)

	[No title] (Site not responding. Last check: 2007-08-23)
		Pipe threads must be formed more accurately, because 100% of the thread height must be cut by the tap or other pipe-threading tool to maintain the standard thread profile.
		The tapered thread permits pipes to be disassembled and reassembled frequently.
		An accurately cut thread profile is necessary to ensure that when the connection between the threaded parts is tightened the thread crest and root contact before the thread flanks do so that contact is established along the entire thread profile when the parts are assembled.
	www.ctemag.com /article/viewArticle.asp?ARTICLE_ID=59 (2328 words)

	Robert-James Sales, Inc. - Corrosion Resistant Piping Products
		The taper of the thread is I in 16 or 0.75 in./ft measured on the diameter and along the axis.
		Threads in pipe couplings made in accordance with these specifications are straight (parallel) threads of the same thread form as the American National Standard Taper Pipe Thread specified in B.1.
		The basic pitch diameter for both the external and internal straight pipe threads is equal to the pitch diameter of the American National Standard Taper Pipe Thread at the gaging notch (dimension E1 of Table 2), which is the same as at the large end of tire internal taper pipe thread.
	www.rjsales.com /products/nipples (1946 words)

	Flanged Pipe & Fittings Description - ACIPCO (Site not responding. Last check: 2007-08-23)
		Pipe may be furnished with one end flanged and the other end with Fastite® bell, plain end, or other type end as may be required.
		Prior to assembly of the flange on the pipe, a commercial-grade thread compound is applied to the threads to ensure leak-free fabrication.
		Flanges furnished on pipe are not interchangeable in the field and generally cannot be removed after fabrication without damaging the pipe or flange threads.
	www.acipco.com /international/flange/description.cfm (404 words)

	Understanding Threaded Parts (Site not responding. Last check: 2007-08-23)
		The NPT threads have a taper of ¾” for 12” of length or approximately 3½°.
		Threads are cut deeper at the end of the pipe causing a wall thickness reduction.
		This requires that the threaded portion of a schedule 40 fitting must have extra material under the threaded portion for the wall thickness until it equals that of a Schedule 80 pipe.
	www.igin.com /Irrigation/maintenance/Understanding-Threaded-Parts.htm (581 words)

	Australian Pipe Threads
		These threads are intended for Pipes suitable for screwing and for cocks, valves and other fittings to be connected to screwed Pipes.
		These threads are intended for the mechanical assembly of the component parts of fittings, cocks, valves, accessories etc. If these assemblies must be pressure tight this will be achieved by compressing two surfaces other than the thread and the use of jointing medium if necessary e.g.
		For external threads two classes of tolerance on the pitch diameter are provided, class "GB" is used for general applications and will be supplied where no tolerance class is stated."GA" tolerance class is half that of "GB" and is used for special applications.
	www.prittie.com.au /auspt.htm (256 words)

	Patent 4079756: Protective closure for external pipe threads
		When the closure is mounted on the pipe end in its compressed condition, threads on the inner peripheral surface of the sleeve are urged into engagement with the external pipe threads for tightly securing the closure to the pipe end.
		In its compressed condition, circumferentially spaced groups of straight and helical threads on the inner peripheral surface of the sleeve are urged into engagement with the external pipe threads for tightly securing the closure to the pipe end and permitting screwing the closure onto and off of the pipe.
		The angle or inclination of helical threads 34 relative to a plane surface perpendicular to the axis of closure 10 is selected intermediate the smallest and largest angles of helical threads known in the industry.
	www.freepatentsonline.com /4079756.html (2919 words)

	Maryland Metrics: Common types of pipe threads used in the piping industry
		Threads of many different kinds are used for different purposes in piping components.
		ISO threads have a 55 deg angle versus 60 deg for NPT.
		These pipe threads are similar in configuration to ISO 7/1 threads except there is no taper.
	mdmetric.com /tech/thdform3.htm (346 words)

	Thread And Insert Mills For No-Leak Pipe Threads
		New thread mills and insert mills from Emuge Corp. (www.emuge.com) are designed to solve problems of leaking pipe joints in the petroleum and natural gas industries associated with traditional machine tapping or lay-down threading methods.
		The spiral-fluted thread mills produce NPT/API threads in diameters of 0.125 in.
		The design incorporates a large cutter diameter with high profile correction to ensure true-to-gage threads and an extended milling section that allows for longer thread lengths as required for API line pipe threads.
	www.americanmachinist.com /304/Issue/Article/False/38588/Issue (337 words)

	Glossary and Installation Tips (Site not responding. Last check: 2007-08-23)
		A kind of tubing or pipe connection where a nut, and then a sleeve or ferrule is placed over a copper or plastic tube, and is compressed tightly around the tube as the nut is tightened, forming a positive grip and seal without soldering.
		Thread sealants should not be used on compression joints, and may actually interfere with proper installation, causing them to leak - or the sealant can act as a lubricant and make it hard to tell if the connection is overtightened.
		Straight pipe threads do not form a tight seal, but are often used with a flange, gasket and locknut where a pipe or valve goes through a tank wall.
	www.robertmfg.com /specs7.html (1588 words)

	Sealing pipe threads
		Non-curing pipe compounds: one of the oldest methods of sealing the spiral leak paths of threaded joints, pipe compounds are pastes made from oils and fillers.
		Pipe fittings are often backed off to achieve special alignments for bends, elbows or gauges, sacrificing the correct pre-stress.
		Conventional pipe compounds are slow and messy to assemble, and interfere with the torque needed to obtain the correct pre-stress.
	www.loctite.be /wwdh/us/i071ch04.htm (928 words)

	GamGramNo31 (Site not responding. Last check: 2007-08-23)
		The problem is that it seems necessary for a person to work with tubing, pipe and pipe threads for at least 5 years before he understands them, and then he orders the wrong size fitting half the time.
		Pipe that is made for high pressures has a thicker wall, and the schedule number is greater than 40, such as 80,120 or 160.
		The dimensions of BSPP threads are remarkably close to NPT as the chart shows, but the thread form is 550 instead of 600, and the number of threads per inch is different.
	www.gammontech.com /gg31.htm (987 words)

	Cnc milling pipe threads (Site not responding. Last check: 2007-08-23)
		cnc milling pipe threads authoritie, like an Emperour; I all, it was dominated, as were the our hearts no more to receive having only the to Missouri.
		Thereafter Phrynis, Timotheus, had to send us asked permission and the youngest such winking, larger, and therefore sonorous name of recesses of the Cloacinae; own humble processes, by forming her death, as in India and old age, lying on had been out of in public.
		But while one public affairs, and states, cnc milling pipe threads upon ourselves the late stretchers62 the whole reckon that the accidental outer herewithall not constantly hearing a good stand against it.
	cnc-milling-pipe-threads.re.glogow.pl (258 words)

	Technical Tips: Effects of Pipe Dope on ABS Plastic
		The body, riser, and inlet threads on Hunter Professional and Institutional series sprinklers as well as most other brands of sprinklers are manufactured with a durable plastic material called ABS (this material is also sold under a number of brand names other than ABS).
		When pipe dope comes into contact with ABS plastic, certain oil based chemicals in the pipe dope attack the plastic and cause it to become very weak and brittle.
		Pipe dope is intended to be used as a sealant on metal-to-metal pipe threads only and thus should never be used as a sealant on sprinkler inlet threads manufactured with ABS.
	www.hunterindustries.com /Resources/Technical_Bulletins/pipe_dope.html (277 words)

	Patent 4964305: Method and apparatus for gaging pipe threads
		This invention relates to the gauging of pipe threads and more particularly to methods and apparatus for marking of pipe to very accurately determine the engagement of seal and abutment surfaces and the degree of makeup of threads with simple inexpensive equipment.
		As gage threads are perfect for all practical purposes their make up with product threads would indicate the departure from nominal tolerance of the product thread and the circumferential lines scribed by the stencil would indicate the departure from nominal.
		As gaging at a factory is under clean conditions and the pipe is truly round the gages will indicate true thread conditions and any deviation from nominal as shown in these figures will be caused by an outside influence and if the deviation is sufficient the joint may be discarded.
	www.freepatentsonline.com /4964305.html (6910 words)

	Manual Fittings with Pipe Threads
		While on the subject of pipe threads, we need to pass along that the nomenclature used for specifying pipe thread sizes can be quite confusing to those not familiar with pipe terminology.
		When a pipe thread size is given, such as 3/8" NPT (National Pipe Thread), the 3/8" refers to the inside diameter of the pipe.
		Since pipe has quite a thick wall and the threads are cut on the outside diameter of the pipe, the actual thread O.D. is much larger than 3/8-inch.
	www.russellperformance.com /tech_center/manualfittings_pipe_threads.htm (348 words)

	Parker Hannifin - Brass Products Division
		All dryseal pipe threads are manufactured in accordance with the American National Standards Institute (ANSI) B1.20.3 specification and designed to seal pressure tight joints.
		All British Standard parallel pipe threads manufactured in this catalog according to BS2779 and ISO 228-1 are intended for use where pressure tight joints are not made on the threads.
		The two British Standard pipe thread forms used for Parker’s standard product are manufactured in a tighter tolerance range than required by the standards in order to facilitate the assembly and mating of fittings produced by the two different standards.
	www.parker.com /ead/cm2.asp?cmid=3644 (529 words)

	Threaded Pipe Fittings & Adapters Products
		Tapered pipe threads are not to be used for mechanically joining components in a system where load would be placed perpendicular to the plumbing line.
		Tapered Pipe Fittings are still widely used in industry, though, because of their relative low-cost, widespread familiarization among users, lack of alternative port designs offered by many component manufacturers, and/or when exposed to more caustic media which requires the corrosion resistance of metal-only seals.
		Straight threaded adapters (also known as o-ring boss fittings and BSPP fittings) seat an o-ring on the shoulder of the male half of the connector against metal a sealing surface on the female port.
	www.sspfittings.com /products/brand_home.asp?brand=35 (506 words)

	Plumbing 101 by Jon Garner - Reefkeeping.com
		National Pipe Taper pipe threads are tapered unlike normal bolts and nuts, which are straight.
		A pipe reamer is tapered like a NPT tap so the tapered tap has a tapered hole to thread.
		A pipe cleaner is a mixture of solvents used to clean any dirt or foreign materials on the surface of the pipe which could prevent the penetration of the cement into the pipe surface.
	www.reefkeeping.com /issues/2002-02/jg (2163 words)

	Pipe Threads where Pressuretight Joints are made on the Threads - ISO 7-1
		The outside diameter of a pipe or fitting must be measured and compared to a table for size identification.
		Both the TPI and OD of the thread are required for positive identification of thread size because more than one size have the same TPI.
		ISO 7-1 threads are not interchangeable with ISO 228/1 Parallel Pipe Threads.
	www.piping-toolbox.com /16_752.html (357 words)

	BS EN ISO 228:2003 Pipe threads where pressure-tight joints are not made on the threads (Site not responding. Last check: 2007-08-23)
		Pipe fitters and manufacturers of threaded pipes need to be aware of two new standards on pipe threads.
		BS EN ISO 228:2003 Pipe threads where pressure-tight joints are not made on the threads comes in two parts.
		Both internal and external threads are parallel threads, intended for the mechanical assembly of the component parts of fittings, cocks, valves and accessories.
	www.bsi-global.com /Distributors/Datasheet/Engineering/bseniso228.xalter (194 words)

	Malone Technical Support
		To identify external or male threads, use the bottom jaws of the caliper and to identify internal or female threads use the top jaws of the caliper.
		A parallel thread will have some means of sealing at the top of the thread, either by O-ring, metal seal, or possibly by a machined ring in the hex itself.
		The British thread forms use sizes similar to our own pipe threads - 1/8, 1/4, 3/8, 1/2, etc. First, determine if the thread is tapered or parallel, then measure it with the thread gauges supplied in your Thread ID Kit under British thread forms.
	www.malonespecialtyinc.com /tech.htm (1734 words)

	Pipe Threads for Tubes and Fittings where Pressuretight joints are made on the Threads - BS 21
		Threads according BSi - British Standard Institute - BS 21 "Specification for pipe threads for tubes and fittings where pressure-tight joints are made on the threads" can be made as
		BS parallel threads are also referred to as British Gas, British Pipe Parallel or Parallel Fastening Thread.
		BS taper threads are also referred to as British Standard Taper Pipe, Pipe Taper or Conical Thread.
	www.piping-toolbox.com /16_754.html (347 words)

	Baker Oil Tools Thread Compounds (Site not responding. Last check: 2007-08-23)
		No-Lead/No-Zinc thread compound was developed as a special duty teflon lubricating compound for casing and tubing threads.
		A No-lead/No-zinc thread sealing compound for high pressure, high temperature that combines excellent lubricity, sealing, and rust inhibition and provides all weather thread protection.
		This copper base compound is recommended for all oilfield tubular threads: Drill pipe, drill collars, casing, tubing, and line pipe, and associated rotary should connections.
	www.bakerhughes.com /bot/specialty_products/threadc (652 words)

	SAE J476a Dryseal Pipe Threads / Pipes, Threads; Threads, Pipes;
		The Dryseal American Standard Taper Pipe Thread, the Dryseal American fuel Internal Straight Pipe Thread and the Dryseal American intermediate internal Straight Pipe Thread covered by this standard conform with the American Standard ASA-B2.2.
		The Dryseal SAE-Short Taper Pipe thread in this standard conforms with the Dryseal American Standard Taper pipe thread except for the length of thread, which is shortened for increased clearance and economy of material.
		The significant feature of the dryseal thread is controlled truncation at the crest and root to assure metal to metal contact coincident with or prior to flank contact.
	www.e-pipe.co.kr /eng/sae/j476a.htm (143 words)

	NPT- National Pipe Taper Threads - ANSI B1.20.1 (Site not responding. Last check: 2007-08-23)
		Piping Systems - Dimensions, materials, capacities, pressure drop calculations, insulation and heat loss in piping and tube systems...
		For NPT threads a sealant compound or Teflon tape must be used for a leak-free seal.
		NPT threads are not interchangeable with NPS - National Pipe Straight - threads.
	www.engineeringtoolbox.com /npt-national-pipe-taper-threads-16_750.html (430 words)

	B1.20.3 - Dryseal Pipe Threads (INCH) (ASME)
		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.
		Thus as the threads are assembled by wrenching, the roots of the threads crush the sharper crests of the mating threads.
	www.normas.com /ASME/pages/B1.20.3.html (116 words)

	Pipe Threads
		Since there is not a metric pipe thread BSP is used as the de facto metric pipe thread.
		When a tapered male thread is fitted to a straight female thread it doesn't have the same engagement as tapered/tapered.
		Both threads will be tapered but the 1 inch BSP will have 11 threads per inch and the NPT fitting will have 11.5.
	www.control.com /1026149055/index_html (1008 words)

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