Metal Bellows Correctedn 7/11/00 6:40 PM Page 75
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[
IN-LINE PRESSURE BALANCED
X-PRESS II EXPANSION JOINTS]
–-–
Features
• Eliminates main anchors
• Eliminates pressure thrust
• Long axial movement
• Self draining convolutions
• Integral cover and liner
• Leak proof – packless
• Maintenance free
• Integral guide ring
• 5 Year Warranty with alloy 625 bellows
The X-Press II is an inline externally pressurized, pressure balanced expansion joint. The built in pressure
eompensating bellows eliminates all pressure thrust traditionally created from using unrestrained bellows.
The X-Press II is capable of long axial movements while eliminating pressure thrust on the system. Main
anchors are no longer required!
The unique design also incorporates internal guide rings to minimize external guiding requirements, a full
thickness cover that is easy to insulate, self draining convolutions to minimize corrosion and an integral liner
that insensitive to flow direction. The X-Press can be supplied in single or double ended design. Either type
can be supplied with a support that acts as an intermediate anchor.
Pipe Guide Spacing
Senior Flexonics Pathway recommends the first guide for an X-Press or X-Press II should be located within 12
pipe diameters of the expansion joint. The remaining guides should be spaced in accordance with the
formula below.
L = 0.131*(Ep*Ip/(P*A+SR*AX))
.5
L = Maximum intermediate guide spacing (Feet)
Ep = pipe modulus of elasticity (lb/In
2
)
Ip = Pipe moment of inertia (Inches
4
)
P = Design pressure (lb/In
2
) Ep - 27,400,000 lb/In
2
for carbon steel pipe at 300F.
A = Bellows effective area (Inches
2
) Ip - See pages 87 through 89 for pipe moments of inertia
SR = Bellows spring rate A – See pages 78 and 81 for effective areas
AX = Axial movement SR – See pares 78 and 81 for expansion joint spring rates
75
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