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Threading pipe

Pipe Type:carbon steel,welded, erw
Application: Construction / building materials steel pipe
Low pressure liquid, water, gas, oil, line pipe
Specification: Out Diameter: 21.3mmOD~762mm OD
Wall Thickness: 0.049” – 2.5” (1.24- 63.5mm)
Length: 5.8m, 6 m , 12 m or according to customer’s request
Standard: DIN 2440, ISO 65, BS 1387, BS 1139, BS 4568, EN 10255, EN 39 GB/T 3091, GB/T 13793
JIS 3444 ASTM A53, A500, A36, A252, A795, API 5L
Ends:Threaded ends : with or without coupling / socket
Surface:Lightly oiled, Hot dip galvanized, Electro galvanized, Black, Bare, Varnish coating/Anti rust oil, Protective Coatings
Packing: 1. in bundle with steel strips;
2. in bundle with steel strips and plastic waterproof wrapped

1


NPT Pipe Thread Sizes

Nominal NPT Size

Outer Diameter inch (mm)

Threads per inch

Pitch of Thread inch (mm)

1/16"

0.3125 in (7.94 mm)

27

0.03704 in (0.94082 mm)

⅛"

0.405 in (10.29 mm)

27

0.03704 in (0.94082 mm)

¼"

0.540 in (13.72 mm)

18

0.05556 in (1.41122 mm)

⅜"

0.675 in (17.15 mm)

18

0.05556 in (1.41122 mm)

½"

0.840 in (21.34 mm)

14

0.07143 in (1.81432 mm)

¾"

1.050 in (26.67 mm)

14

0.07143 in (1.81432 mm)

1"

1.315 in (33.40 mm)

11½

0.08696 in (2.20878 mm)

1¼"

1.660 in (42.16 mm)

11½

0.08696 in (2.20878 mm)

1½"

1.900 in (48.26 mm)

11½

0.08696 in (2.20878 mm)

2"

2.375 in (60.33 mm)

11½

0.08696 in (2.20878 mm)

2½"

2.875 in (73.02 mm)

8

0.12500 in (3.175 mm)

3"

3.500 in (88.90 mm)

8

0.12500 in (3.175 mm)

4"

4.500 in (114.30 mm)

8

0.12500 in (3.175 mm)

5"

5.563 in (141.30 mm)

8

0.12500 in (3.175 mm)

6"

6.625 in (168.27 mm)

8

0.12500 in (3.175 mm)

10"

10.750 in (273.05 mm)

8

0.12500 in (3.175 mm)

12"

12.750 in (323.85 mm)

8

0.12500 in (3.175 mm)

14" OD

14 in (355.60 mm)

8

0.12500 in (3.175 mm)

16" OD

16 in (406.40 mm)

8

0.12500 in (3.175 mm)

18" OD

18 in (457.20 mm)

8

0.12500 in (3.175 mm)

20" OD

20 in (508.00 mm)

8

0.12500 in (3.175 mm)

24" OD

24 in (609.60 mm)

8

0.12500 in (3.175 mm)


2

Pipe threads are used to make not only a mechanical joint but also a leakproof liquid seal. This is accomplished by machining the thread form on a taper andusing pipe sealant to fill any voids between the two threads which could causea spiral leak. In both thread standards

there are 2 different types of threads:

Parallel ('straight') threads, BSPP (British Standard Pipe ParallelThread), which have a constant diameter; denoted by the letter G.

Taper threads, BSPT (British Standard Pipe Taper Thread), whosediameter increases or decreases along the length of the thread; denotedby the letter R.A parallel pipe thread only forms a mechanical seal and is not used for liquidseal applications. While a tapered pipe thread that can make a close-fitting wet seal. Pipe threads used for liquid joints can be divided into two types:

Jointing threads: These are pipe threads where pressure-tightness ismade through the mating of two threads together. They always use ataper male thread, but can have either parallel or taper female threadsand the seal is usually secured with a sealant compound. (In Europe,taper female pipe threads are not commonly used.)

Fastening threads: These are parallel pipe threads used where a pressure-tight joint is achieved by the compression of a soft material(such as an o-ring seal, gasket or a washer) between the end face of the male thread and a socket or nipple face, with the tightening of a backnut. 


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