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www.dklok.com
Instrumentation Pipe
&Weld Fittings
Instrumentation Pipe &Weld Fittings
6000psig, 10000psig and standard rating
DK-Lok Thread Fittings
Three different ratings are available to fit your specific application.
•
Standard rating : page 3
•
10,000 psig : page 12
•
6,000 psig : page 15
DK-Lok Thread Fittings - Standard Rating are designed to the requirements of ASME B31.3 process piping code.
The pipe thread sizes are available 1/8” to 1”
Table 1.
Pressure Ratings
DK-LokWeld Fittings
See page 16
•
Tube Socket Weld
•
Pipe Butt-weld
Features of DK-Lok Thread Fittings
•
Wrench flat body design allowing standard Hex. wrench assembly.
•
Attractive finishes to suit precision equipment.
•
Much less-weight design compared to Class 3000 pipe fittings.
•
Fine pipe thread construction equals or exceeds the requirement of ASME B1.20.1 to ensure maximum thread engagement.
•
Male pipe threads capped for protection from damages.
•
Fitting materials available in SS316, Brass and Carbon Steel.
Thread Fittings - Standard Rating
•
Pressure ratings listed are for temperature up to 37
℃
(100
℉
)
•
Pressure rating is calculated at -28 to 37
℃
(-20 to 100
℉
) using allowable stress value of 20,000psi for SS316, 10,000psi for Brass,
and 20,000psi for Carbon Steel as per ASME B31.3 Process Piping Code.
•
To determine the working pressure of ASME B31.1 Power Piping Code, multiply the ASME B31.3 rating by 0.94. Brass pressure
ratings remain the same.
•
The pressure ratings of reducing hex bushing (GHB), pipe plug (GP), and shaped fittings such as Elbow, Tee, Crosses are not
covered in this table. See the pressure rating in the dimensional table.
Size
Designator
NPT/ISO
Pipe Size
Stainless Steel 316
Brass
Carbon Steel
Male
Female
Male
Female
Male
Female
bar
psig bar
psig bar
psig bar
psig bar
psig bar
psig
2
1/8
689 10,000 420 6,100 337 4,900 207 3,000 689 10,000 420 6,100
4
1/4
558 8,100 434 6,300 275 4,000 214 3,200 558
8,100 434 6,300
6
3/8
524 7,600 345 5,000 262 3,800 172 2,500 524 7,600 345 5,000
8
1/2
517 7,500 324 4,700 255 3,700 158 2,300 517 7,500 324 4,700
12
3/4
496 7,200 303 4,400 248 3,600 152 2,200 496 7,200 303 4,400
16
1
365 5,300 296 4,300 172 2,500 145 2,100 365 5,300 296 4,300
Valves
3
All dimensions are in millimeters unless otherwise specified and only for reference subject to change.