x

Blog

Precision Gages

An Overview of NPTF L-1 Ring Gages

Introduction:NPTF L1 ring gages inspect the hand-tight engagement or the functional size of a part in question. This includes the male threads or the nipple that must conform to specific calculations before being deemed usable. NPTF L-1 RIngs are designed to conform to the ANSI/ASME B1.20.5 standards. Gaging the NPTF external threads requires using more equipment so it confirms the standards stated. Screw thread pipe ring gages have two basic classes which includes plain and threaded. NPTF Rings L-1 belongs to the latter. The gage is threaded onto the pipe or equipment to be measured via hand. More About NPTF Rings L-1:NPTF is also called “Dryseal” because the thread tolerance is controlled very strictly. Still, the gages are used in a similar manner to plug gages except for the difference in the thread, which is internal in the case of pipe plugs and external in the case of rings. NPTF Rings L-1 is also called “thin” gage and parts that are measured on it are considered tolerable when they come flush to the ring’s end to a positive or negative one turn of the unmarked side, effective measuring the first 4 or 5 threads. For the further threads, NPTF L-2 ring gage is used which measures from the fifth to seventh threads. About NPTF Threads:NPTF threads are measured in the same fashion as ANTP threads both internally and externally (we use the NPTF L-1 ring for external measurement). But the gages are still dimensionally different which is why they cannot be used interchangeably. From the basic number of turns specified for the NPTF L-1 Ring, a turn of 1 ½ from the basic turn is still acceptable for the L2 ring gage. Both NPT and NPTF have the same taper per inch, as well as threads per inch, the real difference lies in diameters (major and minor) along with the crest and the root of the threads. The threads of both, NPT and NPTF are designed differently, with the NPTF threads being designed to have a smaller range than NPT threads and interfere with the mating thread. This in turn creates a dry mechanical seal that prevents leakage without the use of a sealant. This happens because the NPTF threads are designed to have interference at the root and crest of the threads not just minor, but also on the major diameter. This results in a leak-proof connection.Conclusion:NPTF L-1 Ring Gages from WESTport Corporation are ideal for measuring the external threads of pipes and/or other equipment and ensuring the said equipment or part in question falls within the said parameters. Using state-of-the-art technology and excellent customer service, we are thoroughly committed to ensuring we retain our status as one of the major quality assurance products and services. WESTport has been servicing industry worldwide since 1989 and is an ISO 9001 and ISO 17025 accredited manufacturer of quality assurance products. Written by WESTport Corporation. All rights reserved. Any reproduction is strictly prohibited.

Here's an Overview of Our NPTF L-2 Ring Gages

Introduction:NPTF L-2 Ring Rages are used in conjunction with NPTF L-1 Rings, where it is used to inspect the wrench engagement threads of a coupling and the taper of the external threads. They are manufactured as per the ANSI/ASME B1.20.5 standard. WESTport provides a free certfificate traceable to NIST with each ring gage. L2 rings are also called the thick ring and that is used to check the thread element of those threads that have been engaged when tightened with a wrench. They are used in conjunction with the NPFT L1 gages and ensure dimensional compliance of the rings of the equipment or part in question. How They Are Used:The NPTF L-2 Rings are used as a check on taper where its engagement in the L-1 and L-2 dryseal must be within “One and a half” turn of the difference between the basic turn engagement of the ring gages. Basically, you are using the NPTF external ring gages in a similar fashion to pipe plug gages. The only difference is the measurement of the external gage instead of the internal. NPTF L-2 Rings are not just for the second half, but also the required half for the measurement of the fifth, sixth, and seventh threads. The L2 in the name is a representation of the dimension in the thread specification that coincides with the “Wrench Tight Engagement Length”.After the use of NPTF L-2 Ring Gage, a final check involves the use of a plain tapered ring gage, which is also called the NPTF 6 Step which helps in the measurement of the major diameter of the external thread of the part in question. More on NPTF 6 Step Rings:NPTF, along with ANPT (Aeronautical National Pipe Taper) external threads are first graded with NPTF L-1 Ring Gage for the measurement of the first five rings. The gage is hand tightened and the parts being checked are considered acceptable when they come flush to the end of the ring to plus or minus one turn of the unmarked side. The L-1 ring is also called the thin ring which is followed by the thick or the L-2 ring for checking the approximation of the rings or threads from fifth to seventh. With special emphasis on thread tolerance, the 6-step ring is used in the end.Similar to the L1 ring, the L2 ring is also used as per the count of the number of turns that determine the distance traveled by the ring over the object in question. L-1 and NPTF L-2 Rings together inspect the lead, taper, pitch and minor diameter. The face of the rings should not vary more than ½ turn to the relative position of the small end of the pipe and the basic gaging with the use of both L-1 and NPTF L-2. Conclusion:At WESTport Corporation, we have been providing industry world-wide with precision measuring instruments and calibration services since 1989. WESTport employs state-of-the-art measures to ensure all our products comply with the ISO 9001, and ISO/IEC 17025 standards. Moreover, our expanded product line includes (but is not limited to): Thread and Plain Gages API Plug and Ring Gages Taps and Dies Medical Gages Spline Gages Full-service Metrology Laboratories for tool calibration, repair, and onsite services Written by WESTport Corporation. All rights reserved. Any reproduction is strictly prohibited.

3 Ways Your Thread Gages Can Sustain Damage

Threaded fasteners play a vital role in the construction of a wide range of products. Without accurate thread sizing, a fastener's ability to provide a secure connection is compromised. Manufacturers rely on thread gages to check fastener specifications and ensure the integrity of all threaded fasteners leaving their facility. Your thread gages are designed to be durable, but they may sustain some damage over time. If you know how thread gages can sustain damage, you will be equipped to identify faulty thread gages before they create serious problems in the future. 1. Abrasions One of the most common ways that a thread gage can sustain damage is through contact with the fasteners it is measuring. A fastener is either threaded through or into the thread gage. The threading process can create friction that causes abrasions to form on the interior surface of the thread gage. Abrasions have the potential to alter the profile of the thread gage, making it impossible to produce an accurate reading when using the damaged thread gage to take measurements. Be sure that you inspect your thread gages often for evidence of abrasions and replace damaged gages quickly to preserve the integrity of your fasteners. 2. Expansion Many of the thread gages used in modern manufacturing facilities are made from steel. Steel is a metal alloy that offers great strength and durability, but it does have a tendency to expand over time. The molecules within a steel product can start to relax once the steel is put into use. Environmental factors like temperature and humidity can influence the rate at which steel expands. You want to ensure that you are using your thread gages in a controlled environment. Fasteners should only be tested in temperature-controlled settings, and thread gages must be stored in a temperature-controlled space to prevent any damage caused by expansion. 3. Burrs The dimensions of a thread gage must be exact if you want to ensure that your fasteners meet strict design specifications. Anytime one metal product comes into contact with another, it's possible for burrs to form. Burrs are the result of contaminants that have cut their way into the surface of your thread gages. A burr can make it impossible to obtain an accurate measurement using your thread gage, and this could result in a decline in fastener quality. Inspect all thread gages used in your facility often to ensure burrs don't cause threaded fastener problems in the future. To learn more about thread gages or to replace your worn-out ones, contact a supplier.

Blog