SEO Version
Installation Instructions for Series 440 PTFE Expansion Joints
ENGINEERING DESIGN NOTES:
1.
It is essential that piping system thrusts be calculated to ensure cor-
rect sizing of anchors and pipe supports, plus ensure that allowable thrust
forces on adjacent mechanical and rotating equipment are not exceeded.
Please use the following formulas:
T
p
= P • T
f
T
p
is the pressure thrust (lb
f
),
P
is the system operating pressure (Psig)
and
T
1
is the thrust factor (or bellows effective area [in
2
]). The pressure
thrust,
T
p
, will act in the axial direction and must be added to the axial
spring force
(Fx•
∆
x)
to give the total axial reaction force,
Rx
.
Rx = T
p
+ (Fx •
∆
x)
Rx
is the pipe support reaction force (lb
f
),
T
p
is the pressure thrust (lb
f
),
Fx
is the axial spring force of the unit and
∆
x
is the expected or designed
axial movement of the unit (See Tables 1-6).
2.
It should be noted that axial spring rate values found in Tables 1
through 6 are based on an ambient temperature (70
°
F) and will decrease
as the system temperature rises. In addition, spring rates decrease over
time due to thermoplastic creep if units are operated under pressure.
1. Service Conditions:
Make sure the expansion joint ratings for tempera-
ture, vacuum, spring rates and movements match the system requirements.
Contact PROCO if the system requirements exceed those of the expansion
joint selected.
2. Alignment:
PROCO Series 440 PTFE expansion joints are not designed
to make up for piping misalignment error. Pipe misalignment should be no
more than 1/8" in any direction. Misalignment of an expansion joint will
reduce the rated movements and can cause stress of material properties,
thus causing reduced service life.
3. Limit Bolt/Cable:
Limit bolts and cables are factory set at the maximum
allowable travel position to prevent over extension. Do not remove or alter
nuts at any time. Damage or personal injury can result due to changes in
limit bolt/cable settings.
4. Anchoring:
Solid anchoring is required whenever the pipeline changes
direction. PROCO Series 440 PTFE expansion joints should be located as
close as possible to these anchor points. If an anchoring system is not
used, any associated pressure thrust can cause excessive movement, ulti-
mately damaging the expansion joint.
(It should be noted that the attached
limit bolts/cables are designed to limit movement and are not designed
to handle pressure thrust.)
5. Pipe Support:
Piping must be supported by hangers or anchors so
expansion joints do not carry any pipe weight.
6. Personnel Protection:
It is strongly recommended that spray shields
be used for all hazardous service to protect against serious personal
injury in the event of expansion joint failure. (Contact PROCO for spray
shield information.)
7. Installation:
a.
Store expansion joints with wood covers in-place to protect PTFE flange
surfaces from damage until ready to install.
b.
Check to make sure PTFE surfaces are clean and free of foreign sedi-
ment. Remove nicks, burrs and deep scratches with a fine emery cloth.
If surface irregularities cannot be completely removed, install a PTFE
envelope-type gasket to obtain an adequate seal.
c.
Install the PROCO Series 440 PTFE expansion joints to the prescribed
neutral lengths. If expansion joints are used in high temperature pro-
cesses, it is recommended that units be installed at/near the extended
values. For cold process installations, expansion joints should be in-
stalled in a nearly compressed length. These settings will enable the
expansion joint to realize full travel capabilities. (See appropriate Tables
for Neutral Lengths.)
d.
Thread installation bolts from mating flange side to prevent possible
damage to PTFE elements. Extend bolts beyond the expansion joint flange
by no more than 1-2 threads. Nuts are not necessary due to threaded
flange holes.
e.
Tighten flange bolts with a torque wrench. Tighten in an alternate
crossing pattern in 20% increments until 80% of final bolt torques have
been achieved. Tighten to final torque values (listed in Torque Table List-
ing) in a clockwise fashion around the flange to ensure bolts carry equal
stress burdens.
f.
Re-tighten bolts after first cycle of operation. Re-tighten as necessary
after every planned maintenance shutdown. All bolts should be re-torqued
to the above listed values.
8. Operations:
After expansion joints are installed, it may be necessary to
air blast the exterior to remove foreign debris, such as metal chips, from
between the convolutions. The expansion joint should then be covered
with a shield to protect from damage and foreign debris during operation.
(Note: Do not weld in immediate vicinity of expansion joint unless it is
properly protected.)
Pump
Foundation
Anchor
Expansion
Joints
Guide
Expansion
Joint
TYPICAL PUMP AND PIPING LAYOUT USING
EXPANSION JOINTS WHEN EQUIPMENT AND
PIPING ARE PROPERLY ANCHORED.
SIZE I.D. (IN)
1.0
1.25
1.5
2.0
2.5
3.0
4.0
5.0
6.0
8.0
10.0 12.0
TORQUE (FT/LBS)
10
16
25
52
47
82
54
80
100
135
125
155
TOLERANCE (+/-)(FT/LBS)
2
3
6
13
11
20
13
20
24
32
31
38
TORQUE TABLE LISTING
Notes:
1. Bolt Torque requirements may vary depending on mating flange material and installation.
2. “Over-Torque” may cause the PTFE material to creep.
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