INVINCIBLE

Teflon® Lined Expansion Joints

Series 700 & HT700

Construction Features

• Choice of eight cover elastomers.
• Sized up to 96 inch diameter.
• Baked Enamel. Ductile Iron, Carbon or Stainless Steel Split Back-up Rings.
• Corrosion resistant, chemically inert and nonaging Teflon® liner.
• Control rods to restrict excessive elongation or compression.
• High temperature resistant fabric reinforcement for operating temperatures up to 400 degrees F.
  

Performance Features

• Working pressures up to 165 psi at temperatures up to 400 degrees F in standard models. Higher pressure ratings available.
• Minimum 4 to 1 safety factor, rated to burst pressure.
• Teflon® liner is etched and permanently bonded to expansion joint body and flange faces.
• Components are pressure cured resulting in structurally sound, long service life.
• Optional exterior coat of Hypalon® paint provides additional protection against ozone weathering and chemical exposure.
• Handbuilt to your exact specifications.
  

Also Available in Multiple Arch Construction

Series 700

Mercer Invincible Series 700 Teflon® lined expansion joints combine the advantages of Teflon®:

• Anti-stick properties
• Superior Strength
• Excellent chemical resistance
• Non-aging
  

with the advantages of Mercer's elastomeric expansion joints:

• Isolate mechanical vibration
• Long life expectancy
• Absorb pressure surges
• Eliminate electrolysis
• Small space requirements
• Allow fourway movements (Axial, lateral, torsional, angular), eliminating problems of pipes buckling or pulling apart.

The result is an expansion joint that offers unmatched protection against highly corrosive fluids and extreme temperatures.

The Series 700 features either a TFE* or FED** seamless liner that extends through the body of the expansion joint to the outer edge of raided flange faces. The liner is fused to the body when the joint is cured. This type of construction provides ultimate protection against chemicals seeping or leaking. An optional coat of Hypalon® paint is recommended to protect the exterior against weather, ozone and chemicals.

The INVINCIBLE 700 is specifically designed for the severe service conditions found in:

• Power generating plants
• Wastewater treatment and pollution control systems
• Chemical plants
• Petrochemical and process piping systems
• Pulp and paper mills

Where expansion joints must be able to withstand high temperatures and corrosive materials on a daily basis.

The performance of the INVINCIBLE 700 in these applications is unequaled by plastic, metallic or other elastomeric expansion joints.

Series HT700

Invincible Series HT700 combines all the construction and performance advantages of the 700, with high temperature resistance. Reinforced with high temperature resistant fabric, and with the cover of either EPDM or Viton®, the HT700 can provide full pressure service at operating temperatures up to 350 degrees F and 400 degrees F respectively.

Viton® is a registered trademark of DuPont Performance Elastomers

Series HT700

Invincible Series HT700 combines all the construction and performance advantages of the 700, with high temperature resistance.  Reinforced with high temperature resistant fabric, and with the cover of either EPDM or Viton®, the HT700 can provide full pressure service at operating temperatures up to 350 degrees F and 400 degrees F respectively.

Caution:

1.  Do not install any of the products in this bulletin at pressures or temperatures higher than the published ratings.

2.   Series 700 and HT700 must be installed against standard raised faced or flat faced flanges.  Do not install them against recessed flanges such as Victaulic without calling the factory for proper steel filler flanges.  If our rubber flanges do not have full bearing the expansion joint will be damaged and leak or fail.

3.  Pipe system flanges must be smooth and flat.  Screw in brass inserts such as those used in check valves can damage the rubber faces if they project above the cast flange face.

4.  Wafer type check valves must exactly center on the rubber flanges.  Valve O.D. and I.D. must conform to raised face dimensions.

5.  Use control rods as indicated above.

6.  Check Chemical Resistance Guise CRG-MR1 for service
     elastomer compatibility.

7.  Follow installation instructions.

Back-up Rings
Standard expansion joints are furnished with ASA-150 back-up rings.  Series 300 ASA, Din, Pn, Jin and British Standards are also
available, but sometimes at higher cost.  heck factory for pricing.

Unanchored Piping Applications
Series 700 & HT700 expansion joints used as noise & vibration dampeners installed in unanchored piping will overextend in re- spoons to system pressure & must be installed with control rods assemblies.

Adjust the spring mounting so the equipment is at proper elevation and level.  Leave a space between pipe flanges equal to the expan- sion joint's face to face length shown on page 3.  Install expansion joint and control rod assemblies.  Control rod stop nuts should be finger tight against gusset plate.  Lock on position with lock nut.  Control rod assemblies will prevent extension of expansion joint & will not allow transfer of thrust load to spring supports of equipment and/or piping.

Anchored Piping Applications
Series 700 & HT700 expansion joints used to compensate for thermal movement in properly anchored & guided piping systems generally do not require control rods, provided piping movements are within the allowables shown on page 3.

If, as an added precaution, designers elect to use control rods in anchored systems the expansion joint should be installed at its exact published face to face length.   When control rod assemblies are installed the stop nuts should be braced away from the gusset plate a distance equal to the allowable extension of the joint.  (See table, page 3)  This will prevent over extension of the joint.  Compression sleeves should also be employed.  The compression sleeves are cut, at the factory, to the proper length to prevent over compression.

Installation Instructions - 700 & HT700

IMPORTANT:                                                       

a.  Do not weld in vicinity of expansion joint 
b.  Do not lift expansion joint by bolt holes, use padded sling. 
c.  Never operate joint beyond its rated temperature, pressure or movements (see Mercer submittal).
d.  Mating flanges must be flat or raised face.  Do no mate with contoured flanges such as victaulic or similar configurations.
e.  Check for chemical compatibility with the ordered material. 

1.  All pipelines must be properly supported, anchored and guided so joints do not carry pipe or thrust loads.

2.  If piping is not anchored, control units must be used.

3.  Use of control units and thrust sleeves will not protect piping in anchored situations.  Expansion joints must be selected for adequate movement capability.

4.  Piping should be aligned.  Misalignment or improper face to face openings will reduce the allowable motion by the initial inaccuracy. Joints are often damaged if forced into position.

5.  Apply a thin film of graphite, dispersed in glycerin or water to the rubber flange face and between the back up rings and the back of the rubber flange to prevent rubber adhering to the mating metal flange for easy removal of the joint without damage.  No gaskets or gasket sealant should be used.

6.  Install bolts from the back up ring side to avoid    bolt projections cutting the cover.  If this is impossible, bolts should not project more than  1/8" past the nuts.  Use washers over split ring gaps.

7.  Unlike tightening hard flanges, tighten bolts in series making at least three complete circuits of each flange.  Flanges will accept full bolt torque.

8.   After system is in service at operating temperature, check the flange bolts and retighten as necessary.  Repeat in a few weeks or if leaks develop.  It is normal for rubber flanges to relax after initial installation.  Check periodically until bolts remain tight.

9.   Any gauges or cuts in the cover caused during installation should be inspected and sealed.

10.  If control rods are used, the clearance between the rubber washer and the gusset plate should be the allowable axial elongation, if the expansion joint is installed at the published face to  face.   We do not recommend precompression or extension as general practice but it the joint is compressed, the gap is increased by the decrease in length.  I installed elongated, the gap is decreased by the increase in length.Hold one end against the control rod plate and the washers against the nut on the other end when measuring the gap.

EXAMPLE: 6" - 700 - Allowable Extension 3/8"

1.  6" - 700 is installed at published 6" face to face dimension.   Set control rod gap to 3/8".
2.  6" - 700 is installed 5 3/4" long. Set control rod gap to 3/8" plus 1/4" = 5/8"
3.  6" - 700 is installed 6 1/4" long.Set control rod gap to 3/8" minus 1/4"=1/8"

11.   If compression sleeves are used, no setting is required as they are furnished to proper dimension.

12.   If these instructions are not strictly adhered to,the Mercer one year guarantee is void. Joints  should be checked at a maximum of one year intervals for signs of cracking and hardening. Expansion joints showing these symptoms must be replace regardless of age.