Ratermann Manufacturing, Inc. Customer Service 1-800-264-7793 y Fax 1-800-264-7797 y Order Online at Web Store www.rmiorder.com 21E-4 DK-LOK INSTRUMENTATION PIPE & WELD FITTINGS N: 12/20/24 Technical Information Instrumentation Pipe & Weld Fittings 6000psig, 10000psig and standard rating DK-Lok Thread Fittings t ratings are available to t your s tion. • Standard rating : page 21E-4 • 10,000 psig : page 21E 13-15 • 6,000 psig : page 21E-16 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-Lok Weld Fittings See page 21E 17-19 • 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°C (100°F) • Pressure rating is calculated at -28 to 37°C (-20 to 100°F) 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 le e t S n o b r a C s s a r B 6 1 3 le e t S s s elnia t S 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 All dimensions are in millimeters unless specified and only for reference subject to change. Instrumentation Pipe & Weld Fittings
