Page 419 - 4300 Catalog Cover.pdf

4300 Catalog Assembly / Installation
Parker Hannifin Corporation
Tube Fittings Division
Columbus, Ohio
http://www.parker.com/tfd
T9
60° Cone (Metric, BSPP and NPSM)
CONDITION
End of swivel nut contacts hex
shoulder of adapter before
cone and ball nose tightens
Thread engagement seems
adequate and swivel nut is
tight but leakage still occurs
There is leakage from the joint
and the swivel nut is loose
Swivel nut tightens, cone is
tight but connection still leaks
PROBABLE CAUSE(S)
• Wrong combination of swivel
nut and adapter
• Scratches or nicks on sealing
surface
• Chatter marks on sealing
surface
• Inadequate make-up torque
• Inadequate or no chamfer in
adapter
RECOMMENDATION
• Ensure that components are to the
same specification (even with the same
type, there are different designs for
60° cone fittings)
• Replace components. These fittings
depend on metal-to-metal seal and
require smooth mating surfaces
to seal
• Use proper torque to create a seal as
well as prevent vibration loosening
• Use components with proper chamfer
(very common occurrence with NPTF/
NPSM 60° cone fittings). Male pipe end
must have chamfer for proper
sealing. Not all male pipe ends have
chamfer as standard
Troubleshooting Port End Connections
Tapered Thread (including BSPT, NPT and metric taper)
CONDITION
Thread galling
Fitting leaks, even after
proper tightening
Insufficient thread
engagement (3 to 6 threads
of engagement required)
Too much thread engagement
(more than recommended 3 to
6 threads)
Poor-quality threads or
damaged/nicked threads
PROBABLE CAUSE(S)
• Most common in stainless
steel, caused by friction and
lack of lubricant
• Sealant omitted or
inadequately applied
• Damaged or cracked threads
• Cracked port
• Thread mixing of BSPT and
NPT threads
• Quality problem with port or
adapter
• Too much thread sealant (tape)
• Typically port or adapter
machining or wear problem,
or port could be cracked due
to excessive torque
• Larger sizes are more prone to
having nicked threads due to
handling damage
RECOMMENDATION
• Replace fitting and apply proper thread
sealant/lubricant to replacement fitting
and tighten to appropriate TFFT
• Re-apply sealant to appropriate TFFT
and re-tighten
• Replace fitting
• Replace component
• Determine port thread type and replace
fitting with matching thread type
• Have port and adapter thread
inspected; replace faulty parts
• Remove all thread sealant and
re-apply 1 to 2 layers of tape
• Inspect port and adapter for proper
tolerance or wear, replace faulty parts,
retighten to appropriate TFFT
• Replace fitting with threads that
are free of scratches and nicks
Dimensions and pressures for reference only, subject to change.
Port End Assembly