Page 321 - MidlandMetalsCatalog2010baNN

320
H
YDRAULIC
Steel PIPE ADAPTERS
Dash NPTF Torque
Size Thread Size Foot/LBS
-2 1/8-27 12
-4 1/4-18 25
-6 3/8-18 40
-8 1/2-14 54
-12 3/4-14 78
-16 1-11-1/2 112
-20 1-1/4-11-1/2 154
-24 1-1/2-11-1/2 211
-32 2-11-1/2 300
NPTF dry seal pipe
Assembly Instructions
Caution: Although most pipe fittings have suf-
ficient structural integrity to support theweight
of many components, consult our technical
support department for guidance in selection
of parts for this purpose
Working Pressures
The following table lists the recommended work-
ing pressures for steel NPTF hydraulic pipe fittings
manufactured in accordance with SAE standard J514.
Many factors such as number of threads engaged,
impulsing, vibration, mechanical shock, removal and
reassembly, thermal expansion and contraction may
affect the integrity of the fitting or fitting connection.
For these reasons, the recommendedworkingpressures
are actually lower than the capacity of the fittings. SAE
recommends sufficient testing tobe conducted toassure
that performance levels will be safe and satisfactory,
especially if installed in systems operating at elevated
pressures or in severe conditions.
Materials
• .Steel- SAE 12L14 carbon steel trivalent chrome plated
or bright silver finish.
Conformance
• SAE J514 for hex nipples, expanders, elbows, tees and
crosses.
• .SAE J514, J530 and J531 for bushings and plugs.
• Temperature Range: -650F to +4000F
STYLES
• Barstock
• Forged
• .Chamfered -maleendshavean internal 30-degreechamfer
to mate with NPSM female swivel union connections.
Many pipe fittings do not have this chamfer, as it is not
required per SAE J514 standard.
Step 1.Inspect port and fitting to ensure that both are free of
contaminants and excessive burrs and nicks.
Step2. Apply a stripe of an anaerobic liquid pipe sealant around
the male threads leaving the first two threads uncovered. If
no liquid sealant is available, wrap Teflon tape 1 1/2 to 2
turns in a clockwise direction, viewed from the pipe end,
leaving the first two threads uncovered. Caution: Teflon
tape and some pipe sealants are destructive to hydraulic
components. Always use extreme caution and follow
manufacturers recommendations for proper applica-
tion of any sealant in order to prevent contamination
Step 3. Screw finger tight into the port.
Step 4. Wrench tighten the fitting to the correct turns past
finger tight position. (See following table) When installing
elbows or tees, consider final orientation position as to not
exceed the recommended TPFT
Caution: Never back off an installed pipe fitting to
achieve proper alignment. Loosening installed pipe
fittings will corrupt the seal and contribute to leak-
age and failure.
Torque installation of pipe fittings is not a recommended
practice. Thread taper and quality, different port and fitting
materials, plating thickness and types, varying threads seal-
ants, orientation, and other factors reduce the reliability of a
torqued connection. If torque installation is required, refer to
the following table for suggested torque values.
Dash NPTF 4 TO 1 Minimum
Size Thread Size Burst PSI
-1 1/16-27 5000
-2 1/8-27 5000
-4 1/4-18 5000
-6 3/8-18 4000
-8 1/2-14 3000
-12 3/4-14 2500
-16 1-11 1/2 2000
-20 1-1/4-11-1/2 1150
-24 1-1/2-11-1/2 1000
-32 2-11-1/2 750
SAE J514 NPTF PIPE WORKING PRESSURES
Dash NPTF Turns Past
Size Thread Size Finger Tight
-1 1/16-27 2.0 - 3.0
-2 1/8-27 2.0 - 3.0
-4 1/4-18 2.0 - 3.0
-6 3/8-18 2.0 - 3.0
-8 1/2-14 2.0 - 3.0
-12 3/4-14 2.0 - 3.0
-16 1-11 1/2 1.5 - 2.5
-20 1-1/4-11-1/2 1.5 - 2.5
-24 1-1/2-11-1/2 1.5 - 2.5
-32 2-11-1/2 1.5 - 2.5
See STRAIGHT THREAD O-RING FITTING SEC-
TION for assembly instructions and torque values for
STEEL PIPE ADAPTERS HYDRAULIC ADAPTERS