Views: 0 Author: Site Editor Publish Time: 2025-07-15 Origin: Site
Threadolet are primarily used for connecting branch pipes of pipelines, which provide outlets from larger pipes to smaller pipes. The outlets are connected to the main pipe by welding, and for branch pipes, it has a female threaded connection to match. Mainly used for branch pipe connection of reinforcement type fittings, instead of using the reducer tee, reinforcement plate, strengthen the pipe section and other branch pipe connection type.
Threadolet has the advantages of safety and reliability, low cost, simple structure, fixed parameters, easy to design and use. It is more and more widely used in high-pressure, high-temperature, large-diameter, thick-walled pipelines, and its function is to lead out the branch pipe on the main pipe to realize the connection of branch pipelines.
Outlet is mainly used for branch pipe connection reinforcement type fittings, instead of using reducer tee, reinforcement plate, strengthen the pipe section and other branch pipe connection type, with safe and reliable, reduce costs, construction is simple, improve the media flow, series standardization, design and selection of convenient and other outstanding advantages, especially in the high-pressure, high-temperature, large-caliber, thick-walled pipeline is used more and more widely, replacing the traditional branch pipe connection method.
The body of the outlet adopts high-quality forgings, and the material used is the same as the pipeline material, carbon steel, alloy steel, stainless steel, etc. The outlet and the main pipe are welded. The outlet and the main pipe are welded, and the branch pipe or other pipe, instrumentation, valves, the connection has a butt-weld connection, socket weld connection, threaded connection of three types.
Applicable pipe materials: mainly suitable for metal pipes, and can also be used for some plastic pipes with certain strength and toughness.
Applicable working environment: suitable for working environments with medium and low pressure, normal temperature or little temperature change, and has advantages in occasions where frequent disassembly and installation are required.
Sealing principle: Sealing is achieved by relying on the tight bite of threads and sealing materials.
Sealing effect: Under normal use, the sealing performance is good, but under high temperature, high pressure or frequent vibration environment, the threaded connection may become loose, resulting in a decrease in sealing performance.
Size Range | 1/8" - 4" / DN6 - DN100 |
Pressure Rating | Class 3000lbs, 6000lbs |
Standard | MSS SP-97 |
Thread Type | NPT, PT, BSPP, BSPT, PF |
Threadolet are available in a variety of thread forms, such as NPT, NPSC, NPTR, NPSM, NPTF, BSPP, BSPT, etc. The most common thread forms are NPT and BSP.
NPT (National Pipe Thread) is the American standard 60° tapered pipe thread. It is standardized by the American National Standards Institute (ANSI). This thread is characterized by good sealing and is widely used in piping systems in North America.
NPT threads are tapered threads with a taper of 1:16. the amount of change in diameter per inch of thread length is fixed in the axial direction. The threads have a 60° tooth angle, which is designed to provide a good seal during tightening of threadolet.
BSP Threadolet
BSP (British Standard Pipe) threads are British Standard pipe threads. It consists of two types: BSPP (Parallel) cylindrical pipe threads and BSPT (Taper) tapered pipe threads.The BSP standard is widely used in the Commonwealth countries as well as some European countries.
BSPP cylindrical pipe threads have a 55° tooth angle and a cylindrical shape, and their mating method mainly relies on a tight fit between the threads and a sealing gasket to achieve the seal.BSPT tapered pipe threads have the same tooth angle of 55°, a taper of 1:16, and NPT threads are similar, and their sealing is achieved by tightening the tapered threads.
Carbon Steel | ASTM A105 / A105N |
Low Temp Carbon Steel | ASTM A350 LF2 / LF3 |
Pipeline Steel | ASTM A694 F42 / 46 / 56 / 60 / 65 |
Alloy Steel | ASTM A182 F5 / F9 / F11 / F12 / F22 / F91 / F92 |
Stainless Steel | ASTM A182 F304/304L/304H - F316/316L - F317 - F310S - F321 - F347 - F904L |
Duplex Stainless Steel | ASTM A182 F51, F53, F44,F55, F60 |
DN | NPS | DN | NPS | A | D1 | D2 | L | d1 | ||||
3000 | 6000 | 3000 | 6000 | 3000 | 6000 | 3000 | 6000 | |||||
8~900 | 1/4~36 | 6 | 1/8 | 19 | - | 27 | - | 22 | - | 6.7 | 16 | - |
10~900 | 3/8~36 | 8 | 1/4 | 19 | - | 27 | - | 22 | - | 10.2 | 16 | - |
15~900 | 1/2~36 | 10 | 3/8 | 21 | - | 30 | - | 25 | - | 10.4 | 19 | - |
20~900 | 3/4~36 | 15 | 1/2 | 25 | 32 | 38 | 45 | 33 | 42 | 13.6 | 24 | 19 |
25~900 | 1~36 | 20 | 3/4 | 27 | 37 | 47 | 52 | 39 | 48 | 13.9 | 30 | 25 |
32~900 | 11/4~36 | 25 | 1 | 33 | 40 | 56 | 63 | 48 | 58 | 17.3 | 36 | 33 |
40~900 | 11/2~36 | 32 | 11/4 | 33 | 41 | 66 | 72 | 58 | 67 | 18.0 | 45 | 38 |
50~900 | 2~36 | 40 | 11/2 | 35 | 43 | 75 | 83 | 64 | 77 | 18.4 | 51 | 49 |
65~900 | 21/2~36 | 50 | 2 | 38 | 52 | 90 | 104 | 77 | 93 | 19.2 | 65 | 59 |
80~900 | 3~36 | 65 | 21/2 | 46 | - | 105 | - | 94 | - | 28.9 | 76 | - |
100~900 | 4~36 | 80 | 3 | 51 | - | 124 | - | 114 | - | 30.5 | 94 | - |
125~900 | 5~36 | 100 | 4 | 57 | - | 154 | - | 140 | - | 33.0 | 121 | - |
Branch Nominal Size | THRD Outler | ||
DN | NPS | 3000 | 6000 |
6 | 1/8 | 0.05 | - |
8 | 1/4 | 0.05 | - |
10 | 3/8 | 0.09 | - |
15 | 1/2 | 0.17 | 0.32 |
20 | 3/4 | 0.22 | 0.47 |
25 | 1 | 0.43 | 0.65 |
32 | 1¼ | 0.61 | 0.96 |
40 | 1½ | 0.69 | 1.28 |
50 | 2 | 1.10 | 2.15 |
65 | 2½ | 1.52 | - |
80 | 3 | 2.50 | - |
100 | 4 | 4.10 | - |
Surface Preparation: Prior to welding, the welded area of the main and branch seat must be thoroughly cleaned to remove oil, rust and impurities.
Positioning and beveling: According to the design requirements, accurately cut holes in the main pipe and grind the bevel to ensure that the outlet can fit well with the main pipe.
Welding process: The welding process should strictly follow the relevant welding standards and procedures (such as ASME B31.1, B31.3), choose the appropriate welding rod or wire, control the welding parameters to ensure the quality of the weld.
Pre-heating and post-heating: For carbon and alloy steel materials, depending on the wall thickness and material composition, pre-heating and post-weld heat treatment may be required to eliminate residual stress and prevent cracking.
Threaded Connection: When connecting threaded fittings, appropriate sealing materials should be used and appropriate tools should be used to tighten to the specified torque to avoid over tightening or over loosening.
Inspection: Upon completion of welding, non-destructive testing should be performed to verify the integrity of the weld. Pressure testing is also required after the system is installed to ensure overall tightness.
Corrosion protection: Welded areas and threaded connections should be properly treated to prevent corrosion.
Oil and gas industry: Used for connecting meters, sampling ports, drain ports, pressure relief valves, etc.
Chemical and petrochemical industry: a variety of process piping for the connection of small branch pipe, exhaust port, liquid discharge port.
Power industry: power plant boilers, steam pipes and other high-pressure, high-temperature systems, connecting instruments and auxiliary piping.
Water treatment and sewage treatment: connecting sampling port, sewage valve, pressure gauge.
General industrial piping system: Wherever a small diameter branch connection is required, the threaded branch seat is a common choice.
