BULLETIN SAFEFLEX 1000-4
MASON INDUSTRIES | MASON-IND.COM
9
•
9
MASON
SAFEFLEX
SAFEFLEX SFEJ
SFEJ single-spheres are
used where there is minor
expansion, no seismic
considerations or space
and cost controls.
IN BRIEF, SAFEFLEX IS SAFE BECAUSE…
• All Safeflex Expansion Joints are factory tested to
150% of rated pressure before shipment.
• Kevlar
®
high temperature tolerance is outstanding.
• Peroxide cured EPDM covers and tubes with Kevlar
®
reinforcement are superior to sulfur cured EPDM, Natural
Rubber, and Neoprene Nylon reinforced bodies at all
temperatures.
• Kevlar
®
reinforcement wrapped around solid steel rings
cannot pull through the flanges.
• Sealing pressure is higher using external stops as rotation
points.
Safeflex expansion joints are molded and vulcanized in
hydraulic presses. This high pressure process produces a
smooth finished product with outstanding adhesion between the
cover, reinforcement and tube.
Most of our competitors still use Natural Rubber impregnated
Nylon tire cord between sulfur cured, EPDM covers and tubes. This
construction becomes brittle with age at higher temperatures,
so we changed from Nylon to Kevlar
®
, as Kevlar
®
has a higher
modulus that minimizes swell and elongation, and outstanding
temperature tolerance up to 250°F (121°C).
Changing the EPDM curing system from sulfur to the slower,
more expensive peroxide method raised the high temperature
safety factor, as well as other physical properties. We force EPDM
between, over and under the Kevlar
®
cords. This makes Safeflex
superior, as cover, reinforcement and tube are all homogeneous.
Natural Rubber has been completely eliminated to improve aging
and temperature tolerance.
Another serious problem had been
the body pulling out of the flange
because flexible bead wire does not
provide sufficient retention. Our
answer was to wrap the tire cord
around a solid steel ring in place of
the cable. In over 20 years, the steel
ring has never pulled through.
Sealing pressure is amplified by the ductile iron flanges that rotate
inward around solid exterior stops. The split flanges are hooked
together to prevent spreading.
Safeflex was the culmination of 25 years of application experience
and a driving desire to eliminate all possible failures. These
improvements were costly, but the engineering and contracting
communities, and the consumers they serve, have always been
receptive to our improved, longer lasting and safer products.
Why risk failure when there is a better product? The cost
difference is meaningless against safe extended life. Water burst
and leakage failures are catastrophic in downtime and property
damage as sometimes they come close to being waterfalls.
In 1996, we made our major contribution to the safety of the
marketplace by introducing:
PEROXIDE CURED EPDM AND DUPONT KEVLAR®
TIRE CORD REINFORCEMENT TO EXPANSION
JOINT CONSTRUCTION
SAFEFLEX SFDCR
SFDCR twin-sphere reducers
eliminate the need for cast iron
or steel transition pieces usually
found on both ends of pumping
systems. Since steel reducers are
eliminated, there are space, cost
and labor savings. The SFDCR
has a wide range of applications.
SAFEFLEX SFU
SINGLE-SPHERE UNION
CONNECTOR
SFU single-spheres are more than
adequate for both sound reduction
and movements in smaller pipelines.
3 bolt flanges increase sealing
pressure and eliminate pullout
common to threaded pipe coupling
ends poorly adapted to this service.
Solid
Steel
Ring
FLANGE LOCK DETAIL
SAFEFLEX SFDEJ
SFDEJ double-phere connectors are always our first recommendation.
The longer body has better volumetric response to sound pressure
waves and provides superior sound attenuation. In seismic zones the
extra movement capabilities are very important as well.
16" - 24" SFDEJ Sizes
added in 2013 in
response to demand.
MASON/MERCER EXPANSION JOINTS
BULLETIN
SAFEFLEX 1000-4
9
•
10
SS
CT
SS
DI
PC
PT
BT
SS
CT
SS
DI
PC
PT
BT
SS
CT
SS
DI
PC
PT
BT
Pipe
Size
Face to
Face
Allowable Movements
Angular Compression Elongation Transverse
(in) (mm) (in) (mm) (degrees) (in) (mm) (in) (mm) ±(in) ±(mm)
3
/4 20 7 175 25
3
/4 19
3
/8 10
3
/8 10
1 25 7 175 24
1
1
/4 32 8 200 23
1
1
/2 40 8 200 22
2 50 8 200 21
Flange Stops
OTHER SFU FITTING OPTIONS
SINGLESPHERE
SAFEFLEX SFEJ
TWINSPHERE
SAFEFLEX SFDEJ
SINGLESPHERE
SAFEFLEX SFU
Split Powder-
Coated Ductile
Iron Floating
Flanges
Rubber Covered
Molded-In
Reinforcing Ring
Face to
Face
Hooked Interlock
Bead Wire,
SFU Only
Embedded
Solid Steel Ring
All Types Have Multi-Layered
Kevlar
®
Tire Cord Fabric
Reinforcement with PEROXIDE
CURED EPDM Cover,
Liner and Fabric Frictioning
Floating
Flange
SAFEFLEX
SFUCT
Sweat Ends for
Copper Tubing
SAFEFLEX
SFUSS
Stainless Steel
Threaded Ends
SAFEFLEX
SFUBT
Brass Threaded Ends
Powder-Coated
NPT Threaded
Ductile Iron Flanges
Face to
Face
Face to
Face
Pipe
Size
Face to
Face
Allowable Movements
Angular Compression Elongation Transverse
(in) (mm) (in) (mm) (degrees) (in) (mm) (in) (mm) ±(in) ±(mm)
1
1
/2 40 36
2 50 34
2
1
/2 65 32
3 80 7 175 30 1
1
/4 32
3
/4 19
3
/4 19
4 100 28
5 125 24
6 150 22
8 200 20
10 250 8 200 18 1
1
/2 38
7
/8 22
7
/8 22
12 300 16
14 350 10 250 14 1
5
/8 41 1 25 1 25
16 400 11 275 13
1
3
/4 44 1 25 1 25
18 450 11 275 12
20 500 12 300 11
1
7
/8 47 1
1
/8 28 1
1
/8 28
24 600 12 300 10
DIMENSIONS AND ALLOWABLE MOVEMENTS
Pipe
Size
Face to
Face
Allowable Movements
Angular Compression Elongation Transverse
(in) (mm) (in) (mm) (degrees) (in) (mm) (in) (mm) ±(in) ±(mm)
1
1
/2 40
4 100
21
5
/8 16
1
/2 13
3
/8 10
2 50 20
2
1
/2 65 19
3 80 18
4 100 17
5 125 16
6 150
6 150
15
1 25
5
/8 16
5
/8 16
8 200 14
10 250 13
12 300 12
14 350
9 225
10
1
1
/8 29
7
/8 22
7
/8 22
16 400 9
18 450 8
20 500 7
24 600 10 250 6 1
1
/8 29 1 25 1 25
DIMENSIONS AND ALLOWABLE MOVEMENTS
DIMENSIONS AND ALLOWABLE MOVEMENTS
16" – 24" SFDEJ twin-sphere sizes were added in 2013 in response to demand.
Same callouts as
SFDEJ above.
Distributor:
Interflex Hose & Bellows Ltd. • www.interflex.co.uk
Ludlow Eco Park • Ludlow • Shropshire • SY8 1FF • UK
Tel.: +44 (0)1584 878500 • Email: enquiries@interflex.co.uk
BULLETIN SAFEFLEX 1000-4
MASON INDUSTRIES | MASON-IND.COM
9
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11
SAFEFLEX
SFDCR
SAFEFLEX SFDEJ, SFEJ, SFDCR AND SFU KEVLAR
®
REINFORCEMENT
STANDARD AND HIGH PRESSURE CONSTRUCTION-PRESSURE REDUCTION AT HIGHER TEMPERATURES
Pipe
Size
Face to
Face
Allowable Movements
Angular Compression Elongation Transverse
(in) (mm) (in) (mm) (degrees) (in) (mm) (in) (mm) ±(in) ±(mm)
3 x 2 80 x 50 6 150
25 1 25
5
/8 16
5
/8 16
3 x 2
1
/2 80 x 65 6 150
4 x 3 100 x 80 7 175
20 1
1
/4 32
3
/4 19
3
/4 19
5 x 4 125 x 100 8 200
6 x 4 150 x 100 9 225
15 1
5
/8 41
3
/4 19
7
/8 22
6 x 5 150 x 125 9 225
8 x 6 200 x 150 11 275
10 x 8 250 x 200 12 300
DIMENSIONS AND ALLOWABLE MOVEMENTS
Split Powder-
Coated Ductile
Iron Floating
Flanges
Embedded
Solid Steel Ring
Flange
Stops
Multi-Layered
Kevlar®Tire Cord
Fabric Reinforcement
with Peroxide Cured EPDM Cover,
Liner and Fabric Frictioning
Rubber Covered
Molded-In
Reinforcing Ring
All flanged expansion joints illustrated in this bulletin are available with:
• 150 lb ASA Drilling • DIN or PIN-10
• 300 lb ASA Drilling • DIN or PIN-16
• British Series E Drilling • DIN or PIN-25
• British Series F Drilling
Face to
Face
Construction
Type
Construction
Sizes
Nominal Rating
in PSI at:
Nominal Rating
in Bar at:
Max Vacuum
in
Hg
Minus
(in) (mm) 170°F 190°F 210°F 230°F 250°F 77°C 88°C 99°C 110°C 121°C Bar
SFDEJ Standard
1
1
/2" - 16" 40 - 400 250 245 235 225 215 17 16.5 16 15.0 14 14" 0.5
SFDEJ Standard
18" - 24" 450 - 600 180 175 170 165 155 12 11.5 11 10.5 10 14" 0.5
SFDEJ High Pressure
1
1
/2" - 16" 40 - 400 335 325 315 300 285 23 22.0 21 20.0 19 22" 0.7
SFDEJ High Pressure
18" - 24" 450 - 600 225 220 210 200 190 15 14.5 14 13.5 13 22" 0.7
SFEJ Standard
1
1
/2" - 16" 40 - 400 250 245 235 225 215 17 16.5 16 15.0 14 18" 0.6
SFEJ Standard
18" - 24" 450 - 600 180 175 170 165 155 12 11.5 11 10.5 10 18" 0.6
SFEJ High Pressure
1
1
/2" - 16" 40 - 400 335 325 315 300 285 23 22.0 21 20.0 19 29" 1.0
SFEJ High Pressure
18" - 24" 450 - 600 225 220 210 200 190 15 14.5 14 13.5 13 29" 1.0
SFU Standard
All Sizes
250 245 235 225 215 17 16.5 16 15.0 14 18" 0.6
SFDCR Standard
All Sizes
250 245 235 225 215 17 16.5 16 15.0 14 14" 0.5
Distributor:
Interflex Hose & Bellows Ltd. • www.interflex.co.uk
Ludlow Eco Park • Ludlow • Shropshire • SY8 1FF • United Kingdom
Tel.: +44 (0)1584 878500 • Email: enquiries@interflex.co.uk
MASON/MERCER EXPANSION JOINTS
BULLETIN
SAFEFLEX 1000-4
9
•
12
CONTROL RODS CABLES
Small
Washer
Enlarged
Washer
No Bushing
Bushing
Enlarged
Washer
Bushing
COMPETITIVE
CONTROL RODS
ACC CONTROL
CABLES
MASON CR
CONTROL RODS
MASON Control Rods with
properly sized thick washers
& rubber bushings
Cheap competitive Control
Rods with small, thin washers
& no rubber bushings
Connectors installed in piping to allow for expansion or
contraction must be anchored on both ends of the piping run.
They need no control rods or cables. Should controls be used,
they must be adjusted so the gap between the nut and the
washer allows for full outward travel of the expansion joint.
Piping movements must be within the tabulated allowables.
Noise
Transmission
Connectors installed in unanchored piping or connected to
isolated equipment only require control rods or cables for
pressures as tabulated only if noted below.
Type CR and ACC control rods and cables are very different than
the average rod and rubber washer arrangement. Our sets
are all made with oversized washers on the ends to limit the
maximum loading on the rubber materials to 1000 psi (70kg/
cm
2
). Competitive systems use
1
/4" (6mm) rubber washers that
are the same size as the small standard washers. Thrust forces
are so high that standard washers extrude and fail. In addition
to the increased area and thickness of the rubber, all our control
rod washers are molded with rubber bushings so the rod or
cable cannot contact the steel restraining plates and short
circuit the system acoustically.
CAUTION: This extension procedure is an absolute must on
all connections to spring mounted systems such as pumps
(when control rods are not used) or the pressure may
compress the springs solid under the pumps or shift the
foundation.
All high pressure connectors should have control rods or
cables set at maximum expansion joint allowable elongation.
O nly Use Control Rods or Cables if:
1. Expansion Joints cannot be pre-extended and could
cause problems to pipe or equipment.
2. As an added precaution.
Installation Information for Safeflex SFDEJ, SFEJ & SFDCR
Install only within machine rooms.
SFDEJ, SFEJ AND SFDCR CONNECTORS USED AS
NOISE AND VIBRATION DAMPENERS ONLY AND
INSTALLED IN UNANCHORED PIPING WILL GROW IN
RESPONSE TO THE PRESSURE AS SHOWN BELOW.
Adjust the spring mountings so the equipment is at the proper
level. Leave a space between pipe flanges equal to the lengths
shown below and draw the connectors out evenly with the
flange bolts. Spring supported equipment may lift in response
to the tightening so the connector may not be fully extended.
When the connector is at operating pressure, the system will
return to the original position.
Anchor Anchor
SFDEJ, SFEJ SFDCR CONNECTORS
Connectors that are used in expansion applications must be
installed with anchors on either side of the connector.
Distributor:
Interflex Hose & Bellows Ltd. • www.interflex.co.uk
Ludlow Eco Park • Ludlow • Shropshire • SY8 1FF • United Kingdom
Tel.: +44 (0)1584 878500 • Email: enquiries@interflex.co.uk
BULLETIN SAFEFLEX 1000-4
MASON INDUSTRIES | MASON-IND.COM
9
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13
SAFEFLEX SFDEJ
PRESSURE EXTENSION TABLE
Pipe
Size
250 lb Construction 17 Bar Construction
0
psi
100
psi
200
psi
250
psi
0
Bar
6.8
Bar
13.6
Bar
17
Bar
(in) (mm) Face to Face (in) Face to Face (mm)
1
1
/2 40 7 7 7 7 175 175 175 175
2 50 7 7 7 7 175 175 175 175
2
1
/2 65 7 7
7
7 175 175 175 175
3 80 7 7
1
/8 7
3
/16 7
1
/4 175 178 180 181
4 100 7 7
1
/8 7
3
/16 7
1
/4 175 178 180 181
5 125 7 7
1
/8 7
1
/4 7
3
/8 175 178 181 185
6 150 7 7
3
/16 7
3
/8 7
1
/2 175 180 185 188
8 200 8 8
3
/16 8
3
/8 8
1
/2 200 205 210 213
10 250 8 8
1
/4 8
1
/2 8
5
/8 200 206 213 216
12 300 8 8
1
/4 8
1
/2 8
5
/8 200 206 213 216
14 350 10 10
1
/4 10
1
/2 10
5
/8 250 256 263 256
16 400 11 11
5
/16 11
9
/16 11
3
/4 275 283 290 294
Pipe
Size
180 lb Construction 12.25 Bar Construction
0
psi
100
psi
150
psi
180
psi
0
Bar
6.8
Bar
10.2
Bar
2.2
Bar
(in) (mm) Face to Face (in) Face to Face (mm)
18 450 11 11
5
/16 11
9
/16 11
3
/4 275 283 290 294
20 500 12 12
3
/8 12
5
/8 12
7
/8 300 309 316 322
24 600 12 12
3
/8 12
5
/8 12
7
/8 300 309 316 322
SAFEFLEX SFEJ
PRESSURE EXTENSION TABLE
Pipe
Size
250 lb Construction 17 Bar Construction
0
psi
100
psi
200
psi
250
psi
0
Bar
6.8
Bar
13.6
Bar
17
Bar
(in) (mm) Face to Face (in) Face to Face (mm)
1
1
/2 40 4 4 4 4 100 100 100 100
2 50 4 4 4 4 100 100 100 100
2
1
/2 65 4 4
4
4 100 100 100 100
3 80 4 4 4 4 100 100 100 100
4 100 4 4
1
/4 4
3
/8 4
3
/8 100 106 110 110
5 125 4 4
1
/4 4
3
/8 4
3
/8 100 106 110 110
6 150 6 6
1
/4 6
3
/8 6
3
/8 150 156 160 160
8 200 6 6
1
/4 6
3
/8 6
3
/8 150 156 160 160
10 250 6 6
1
/4 6
3
/8 6
3
/8 150 156 160 160
12 300 6 6
3
/8 6
1
/2 6
1
/2 150 160 163 163
14 350 9 9
1
/4 9
3
/8 9
1
/2 225 231 235 238
16 400 9 9
1
/2 9
3
/4 9
7
/8 225 238 244 247
Pipe
Size
180 lb Construction 12.25 Bar Construction
0
psi
100
psi
150
psi
180
psi
0
Bar
6.8
Bar
10.2
Bar
2.2
Bar
(in) (mm) Face to Face (in) Face to Face (mm)
18 450 9 9
5
/8 9
3
/4 9
7
/8 225 241 244 247
20 500 9 9
5
/8 9
3
/4 9
7
/8 225 241 244 247
24 600 10 10
5
/8 10
7
/8 11 250 266 269 275
Pipe
Size
250 lb Construction 17 Bar Construction
0
psi
100
psi
200
psi
250
psi
0
Bar
6.8
Bar
13.6
Bar
17
Bar
(in) (mm) Face to Face (in) Face to Face (mm)
3 x 2 80 x 50 6 6
1
/8 6
3
/16 6
1
/4 150 153 155 156
3 x 2
1
/2 80 x 65 6 6
1
/8 6
3
/16 6
1
/4 150 153 155 156
4 x 3 100 x 80 7 7
1
/8 7
1
/4 7
3
/8 175 178 181 185
5 x 4 125 x 100 8 8
3
/16 8
3
/8 8
1
/2 200 205 210 212
6 x 4 150 x 100 9 9
3
/16 9
3
/8 9
1
/2 225 230 235 237
6 x 5 150 x 125 9 9
3
/4 9
7
/16 9
9
/16 225 231 236 239
8 x 6 200 x 150 11 11
3
/8 11
1
/2 11
5
/8 275 285 287 291
10 x 8 250 x 200 12 12
1
/2 12
3
/4 13 300 312 319 325
SAFEFLEX SFDCR
PRESSURE EXTENSION TABLE
1
/8" (3mm)
Maximum
Extension
if nuts are on
inside
FF
SFDCR
SPACE REQUIRED BETWEEN FLANGES at
VARIOUS PRESSURES
Install Flange Bolts with
Heads on Joint Side
SPACE REQUIRED BETWEEN FLANGES
at VARIOUS PRESSURES
1
/8" (3mm)
Maximum
Extension
if nuts are on
inside
SFDEJ
FF
Preferred
Position
1
/8" (3mm)
Maximum
Extension
if nuts are on
inside
FF
Install Flange Bolts with
Heads on Joint Side
SFEJ
SPACE REQUIRED BETWEEN FLANGES at
VARIOUS PRESSURES
Preferred
Position
FORM A-24375-4
MASON INDUSTRIES | MASON-IND.COM
9
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33
CALCULATIONS
The minimum spool length (SL) based on a specified differential
settlement (DS) would be:
SL =
(
DS
)
- L
TAN θ
Example:
For a required DS of 12" on a 10" pipe line: DS = 12", L = 8", TAN θ = .23
SL =
(
12"
)
- 8" = 52.2" - 8" = 44.2"
.23
The allowable differential settlement based on a given
spool length would be:
DS =
(
SL + L
)
TAN θ
Example:
For a spool length of 24" on a 4" pipe line: SL = 24", L = 7", TAN θ = .55
DS =
(
24" + 7"
)
.55 =
(
31"
)
.55 = 17.1"
Check with factory to verify calculations, generally maximum
differential settlement not to exceed 12".
SAFEFLEX SFDEJ-HE
Pipe
Size
(in)
Allowable
Angular θ
Displacement Tan θ
Length
L
(in)
1
1
/2 30° 0.58 7
2 30° 0.58 7
2
1
/2 30° 0.58 7
3 30° 0.58 7
4 29° 0.55 7
5 24° 0.45 7
6 20° 0.36 7
8 15° 0.27 8
10 13° 0.23 8
12 11° 0.19 8
14 10° 0.18 10
The hinged configuration may be used with Mercer Series 450
and 500 expansion joints as well. Contact Mercer for more information.
SPECIFICATION
Offset shall be accomplished by the angular motion of a double sphere
expansion joint bolted to each end of an intermediate steel pipe.
Bracket each expansion joint with hinged steel connections. Hinges
shall have a pin in a slot on both sides.
The piping on each end of the assembly must be securely anchored to
accept a thrust of 1.5 times the operating pressure multiplied by the
projected area of the pipe.
Specifications for the expansion joints shall be as Mason Industries
Safeflex SFDEJ. The complete hinged assembly shall be Safeflex SFDEJ-HE
as manufactured by Mason Industries Inc.
SAFEFLEX SFDEJ-HE
HINGED EXPANSION JOINTS
Ends Must Be Anchored
to Structure to Accept
Pipe Thrust
NEUTRAL POSITION
Pipe Length Depends on
Field Conditions and Required
Differential Settlement
Pipe Section by
Mercer or Others
Mason Industries Inc.
Safeflex SFDEJ
SETTLEMENT POSITION
L SL L
Hinge with Slot
DS
Distributor:
Interflex Hose & Bellows Ltd. • www.interflex.co.uk
Ludlow Eco Park • Ludlow • Shropshire • SY8 1FF • UK
Tel.: +44 (0)1584 878500 • Email: enquiries@interflex.co.uk
MASON/MERCER EXPANSION JOINTS
BULLETIN
SAFEFLEX 1000-4
9
•
14
Installation Procedures for Safeflex SFDEJ, SFEJ, SFDCR and SFU
Although Safeflex is as safe as possible, it is our general recommendation that flexible connectors are always installed on the equip-
ment side of the shut-off valve, and they are not used in pipe lines that pass through finished ceilings where water damage to the
structure or the equipment below can be extensive.
Install only where leakage or failure will not result in injury or
property damage.
1. a. E xpansion joint rubber flanges must be in contact
with a flat surface. Normal
1
/16" (1.5mm) raised face
is okay. Unacceptable depressions or protrusions are
typical of victaulic or similar flanges.
b. F lange stops must bear on full diameter mating flanges.
c. R ubber flanges will not retain loose elements in valve
bodies that rely on contact with a steel flange. For
example, some check valves are manufactured with
brass inserts positioned by screws. When mating steel
flanges with these valves, there is no problem. However,
with a rubber connector, it cuts the rubber face and can
cause failure, leakage or brass insert escape.
2. Any of the above conditions must be corrected by
installing a full diameter steel flange drilled to standard
dimensions so the flange bolts pass through it. The I.D.
matches the I.D. of the piping. Minimum Plate Thickness is
as follows:
1
/2" (13mm) thick for 1
1
/2" to 8" (40 to 200mm)
pipe ;
3
/4" (19mm) thick for 10" to 18" (250 to 450mm)
pipe; and 1" (25mm) thick for 20" to 24" (500 to 600mm)
pipe. Gasket between this filler flange and the mating
steel flange.
3. Before installing the connector, be certain that all surfaces
are clean and there are no sharp edges of any kind on the
steel flanges. No gasket is required. Apply a thin film of
graphite dispersed in glycerin or water to the face of the
rubber flanges before installing. No other type of lubricant
or seal should be used on the flange face. The graphite
prevents the rubber from adhering to the metal flange
so that the rubber joint can be removed without damage,
should it ever be necessary.
4. I f the connector is to be installed in a system where the
operating pressures do not dictate the use of control
rods, but the connector is to be pre-extended to allow
for growth under pressure, the gap between the piping
flanges should be large enough to allow for the growth as
indicated on the operating pressure chart.
5. Expansion joints installed for expansion and compression
applications should be installed at normal length. Check
allowable movements against design requirements
between anchors.
6. Check temperature and pressure ratings and never
exceed them.
7. Check for chemical compatibility with the ordered material.
8. D o not weld near the expansion joints or weld the steel
flanges to the piping after the expansion joints are
installed. This will either burn or seriously damage the
expansion joints.
9. Although the expansion joints will readily adjust
themselves to misaligned flanges within the specified
movements, they should not be installed where there is more
than
1
/8" (3mm) of initial misalignment or lack of parallelism
in the expansion joints.
10. S lide the connector into position and insert all the flange
bolts. The rubber face must be centered exactly on the
opening. Be sure that the bolts are inserted with the
heads facing the rubber and the nuts on the outside
so they are on the outside of the mating flange. If it
is impossible to insert the bolts in this direction, the
tightened end of the bolt must not protrude more than
1
/8" (3mm) beyond the inside nut. Larger protrusions may
result in the bolt cutting into the rubber cover.
11. A fter all bolts are inserted, make them finger tight and
then proceed to adjust them evenly in a circle. Tighten
the bolts to 75% of the maximum recommended torque
for the bolt size until all bolts have the same tightness.
Tightness may be increased if there is joint leakage.
12. A ll rubber materials tend to relax over a period of time.
It is good practice to check the tightness of the bolts for
the 75% torque about two weeks after installation, and in
extreme cases, particularly when a line is heated up and
allowed to cool repeatedly it is advisable to continue to
check bolt tightness on a monthly basis until such time as
the last check shows no further tightening is required.
13. A llowing the bolts to loosen may cause leaks.
14. Insulation on cold lines should be installed for easy remov-
al to facilitate retightening.
15. I n order to prevent heat buildup, expansion joints in hot
lines should not be insulated.
16. W hile our expansion joints are guaranteed for a period
of one year and designed for many years of service, it is
suggested that expansion joints are replaced every five
years. Cover cracking is of no significance and only cosmetic.
SFU INSTALLATION INSTRUCTIONS
(See general precautions above)
1. A ttach flanges to piping so length between inside flange
faces is equal to face to face length of rubber section of
the SFU.
2. I nsert center section of the SFU and the 3 bolts on each
end. Tighten evenly to 75% of torque value.
3. R etighten as in 12 above.
IT IS IMPORTANT TO FOLLOW ALL OF THE NUMBERED
INSTRUCTIONS TO AVOID NEEDLESS PROBLEMS.
Distributor:
Interflex Hose & Bellows Ltd. • www.interflex.co.uk
Ludlow Eco Park • Ludlow • Shropshire • SY8 1FF • UK
Tel.: +44 (0)1584 878500 • Email: enquiries@interflex.co.uk
