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Suggestions for Installation and Maintenance of Rubber Expansion Joints

Installation and Maintenance

rubber expansion joint


Pipelines containing standard expansion joints should be lined up accurately before installing the joints. If the joints are to be installed with appreciable initial misalignment, compression or elongation, the amount of these deflections should be deducted from the specified allowed movements of the joint. If the total joint deflection due to initial installation and movement of the pipeline during system operation exceeds the published maximum allowable movement, then the pipeline should be altered to reduce the initial installation deflections. Alternately, the pipe may be anchored in some approved manner to limit the pipe movements that the expansion joint must absorb.

Excess Temperatures and Pressures

Expansion joints should never be subjected to operating conditions beyond the pressure and temperature limits recommended by the manufacturer.

Care of Outside Cover

Any damage to the outside protective cover of an expansion joint should be repaired before placing the joint in service. This protective cover is designed to keep harmful materials from penetrating the carcass of the joint.  To further protect the exterior of the expansion joint and to help resist acid and ozone attack, a special coating of Hypalon paint is applied.  All joints should be painted with Hypalon paint yearly after installation to ensure continued protection.

Mating Flanges

Clean all foreign matter and remove burrs or sharp edges from flanges.

Flange Face Lubricant

Apply a thin film of graphite dispersed in glycerin or water to the face of the rubber flanges before installing the expansion joint. This is a type of lubricant that is safe to use on rubber flanges. Its purpose is to simplify installation and permit easy removal when necessary.


Tighten bolts by alternating around the flanges and tighten all bolts equally.  The bolts are not considered tight until the edge of the the flange of the expansion joint flange bulges slightly. Check bolt tightness at least one week after going on stream and periodically thereafter.  As any rubber-like material takes a set after a period of compression, the bolts may loosen and result in a break in the seal.  It is particularly important to check bolts in a hot and cold water system before changing from one medium to the other.


When insulation is used over the pipeline adjacent to a rubber expansion joint, the insulation of the expansion joint is not a recommended practice. However, if insulation is required, it should be made removable to permit ease of access to the flanges. This facilitates periodic inspection of the tightness of joint bolting.


Expansion joints purchased as spares should be stored in a dry, fairly cool, dark place in a flat position – not on the flange edges.  No weight should be placed on the flange edges.

Care When Welding

Welding operations should not be performed in the vicinity of a rubber expansion joint due to the possibility of damage to the joint.

Underground Installation

Unusual applications of rubber expansion joints may require the specification of a protective shield, protective cover, or fire cover.  These three types of cover have one end which is bolted or clamped to the mating pipe flange.  The other end is free, designed to handle the movements of the expansion joint. A protective shield of metal is required when an expansion joint is installed underground. Protective shields should also be used on expansion joints in lines that carry high temperature or corrosive media. This shield will protect personnel or adjacent equipment from injury or damage in the event of leakage or splash. Protective covers or expandable metal are also used to prevent exterior damage to the expansion joint.


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High Temperature Red Silicone Sheeting

red silicone sheet

Our solid silicone red sheet rubber is available with a 60 Shore A Durometer rating.  It is physically durable and is capable of withstanding high temperatures.  In fact, silicone is known to be one of the most heat-resistant elastomers available.  Red silicone offers excellent UV and ozone resistance, withstanding harsh environments and is ideal for indoor and outdoor applications.  This hard silicone rubber can be used for many types of seals and gaskets and can be custom cut to fit your application.

Sizes available: 1/16″, 1/8″ 1/4″
Color: Red/Brown
Temperature Rating: -40°to 356°F
Tensile Strength: 850psi

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New Coupling Options for 2019

AIC Hose Couplings and Fittings

UIP’s sister company, Atlantic International Coupling Company, has been listening to our customers!  In 3Q 2019, we are bringing to market the following highly demanded couplings & fittings:

  • Type B Suction & Discharge Couplings (Bauer style)
  • Universal Air Hose Fittings (Claw/Chicago type)
  • Ground Joint Couplings with 4-Bolt Clamps
  • Sandblast Fittings

All of these couplings, as well as our Combination Nipples and Cam & Groove Couplings, can be used on our premium quality UIP hose products.

Type B Suction & Discharge Couplings are made from galvanized steel and are used for applications containing non-hazardous liquids or water for suction and discharge.  Primary uses include irrigation or de-watering applications.  Compatible with UIP hose Styles 618 and 622.

Universal Air Fittings are plated steel fittings used for air service up to 150 PSI Working Pressure.  Common hose sizes from ¼” to 1” ID.  Compatible with UIP hose Style 112.

Ground Joint Couplings and 4-Bolt Clamps are made from plated steel or iron and are used for air, water and steam service.  Sizes range from ½” to 4” ID.  Compatible with UIP hose Styles 111, 114 and 536.

Sandblast Fittings are made from aluminum and are used with Sand Blast/Recovery hose sizes ¾” to 1-1/2”ID.  Compatible with UIP Hose Styles 334 and 335.

Contact us today so we can fulfill your hose & coupling needs!

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Industrial Hose Price Reduction Announcement

industrial rubber hose

At UIP International, we are constantly looking for new ways to improve our customer value and satisfaction. This includes periodically reviewing our expenses and price lists.

We are pleased to share that we have decided to reduce our prices on our Industrial Rubber Hose products. We believe that these new prices not only give you great value, it also reflects our commitment to customer satisfaction.

As a part of our continued commitment, we have kept our freight allowed policy at $3500 for combination orders (Hose, Couplings, and/or Sheet Rubber Products).

If you would like to place an order or would like a copy of your new hose pricing, please do not hesitate to contact us at 954-785-3539 or email us at sales@uipintl.com. Our friendly staff is available Monday-Friday, from 8:00 A.M. to 5:00 P.M., to process your request.

Should you have any questions or concerns regarding this matter, please feel free to contact us. In the meantime, we thank you again for doing business with UIP International, Inc!

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In Stock and Ready for Same Day Shipment

UIP International offers two warehousing locations to meet our distributors’ needs.  Many of our products are readily available for same-day shipments from both of our Houston, TX and Pompano Beach, FL locations.  Both locations are now offering a cut and couple program with in-house crimping capabilities for our industrial and hydraulic hose lines.  Additionally, our Pompano Beach location utilizes a high-production, precision gasket cutting machine enabling quick production of non-metallic, semi-metallic and non-asbestos gaskets.

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Type 422 UHMW Chemical Suction and Discharge Hose

Type 422 UHMW Chemical Suction & Discharge Hose

UHMW Corrugated Chemical Hose

New corrugated design available.

Ultra High Molecular Weight Polyethylene-lined chemical hose
capable of handling 98% of all common industrial chemicals in pressure, gravity flow, and suction service.

  • Non-Staining UHMW
  • Tube: UHMW Polyethylene
  • Reinforcement: Multiple plies of polyester cord with helix wire
  • Cover: Green corrugated abrasion-resistant EPDM
  • Temperature: -20°F to 180°F
  • Sizes Available: 3/4″ – 4″ I.D., up to 100 Feet Lengths
  • Pressure: 150 psi

Designed for added flexibility

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300 psi Tank Truck Hose Now Available

Tank Truck Hose 300 psi
Introducing Our New Heavy Duty 300 psi Tank Truck Hose.

High pressure Suction and Discharge Hose for petroleum products.
Offers excellent flexibility and handling ease.
Designed for high-pressure applications.
Excellent for oil field applications.
Can handle up to 50% aromatics.
Available in 2″-4″, stocked in 100 foot lengths.
Additional sizes available.

Please contact us for more information


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Unalok Material Handling Hose – Product Highlight


UIP International is proud to offer a flexible solution for all your material handling needs.  Save time and money with our most versatile material handling hose, available in sizes up to 14″ and in a variety of compounds.unalok material handling hose

The Unalok hose offers a multitude of benefits including:


  • high abrasion resistant tubes
  • full flow of product through the hose
  • no built-in nipples to wear out 
  • easily adaptable to existing systems 
  • streamlined design allows for custom length assemblies which can be fabricated on-site in minutes


This industrial engineered hose is as easy to assemble as a band-on coupling.  It is perfect for field repairs, minimizing downtime.  It can be used for vibration absorption, field transfer, cargo loading, tank transfer and slurry transport.  Ideally, this product can be kept on-hand in frequently used sizes, allowing for immediate on-the-job repair and installation.


Unalok elastomer options


Unalok Hose is available in many different tube elastomers including Red Natural Rubber, Black Natural Rubber and Tan Pure Gum Rubber – ready to handle your most demanding applications.  

We stock sizes 2″ – 12″ and can fabricate 14″ upon request.  Other options include duck and rubber flanges, built-in nipples, rubber-lined nipples and beaded ends. 


Call now for more information on our Unalok Material Handling Hose



UNALOK Installation Instructions

Items you will need:
Measuring tape, chalk, knife, hacksaw, clamps, wrenches

  1. Measure and mark the required length of hose.  Add a little extra length for trimming and lateral overlap.
  2. Cut off the marked length of hose plus the extra length, using a sharp wet cutting tool, such as a knife.
  3. Pull the cut surfaces apart so that the steel helix can be pulled out of the rubber. Cut off the steel helix.
  4. Place the two halves of UNALOK coupling parts 1 and 2 at the position marked and clamp together.
  5. Bolt the two halves of the coupling through the joining flanges, inspect the lining of the hose at frequent intervals while tightening bolts. The end of the hose should extend about 1/8” beyond the coupling flange.  Installation is complete when corrugated deformations become clearly visible in the bore of the hose.
  6. Place a sealing gasket between the two couplings and bolt the coupling flanges together. The hose should be attached to a supporting structure over its entire length, but particularly in the area of bends. Conventional hose clamps can be used to prevent undesirable movement of the hose.


Item No.





Wt./Ft. (lbs.) Lining/Tube Thickness (in.) W.P.


Vacuum Hg Min. Bend Ra (in.) Max Prod. Length/Ft.

Stock Item or Min. Order


2″ 3.11 1.92 1/4 150 25″ 11 7/8 100′



3″ 4.65 4.80 1/4 150 25″ 13 3/4 100′



4″ 5.38 5 1/4 150 25″ 19 5/8 100′



5″ 6.58 7.4 5/16 150 25″ 25 5/8 100′



6″ 7.73 9.2 3/8 150 25″ 29 9/16 100′



8″ 10.02 16.06 3/8 150 25″ 68 7/8 40′



10″ 11.89 16.96 3/8 150 25″ 78 3/4 40′



12″ 13.74 18.65 5/16 150 25″ 98 7/16 40′



14″ 16.36 30.35 3/8 150 25″ 111 1/8 40′ CUSTOM


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ISO 9001:2015 Compliance Announcement

In adherence to our dedication of exceptional customer service, we are thrilled to announce that UIP International is now
ISO 9001:2015 Certified.

This achievement is an international recognition given to organizations who implement a rigorous and effective Quality Management System that ensures we are able to meet the needs of not only our existing customers but all new & future prospective customers by delivering an excellent level of customer service and an exceptional standard of goods and services.

We employ a highly experienced team that is focused on making our customers’ experiences easy and enjoyable.  We strive to build relationships with our customers and aim to become an integral solution to our customer’s needs.

In addition to our standard offering of stocked components, which many are available for same-day-shipping; we also provide special order and custom solutions for unique applications.

Our ISO 9001 Certification is in respect to the following scope:
Distribution of Rubber Marine, Industrial, Hydraulic and Metal Hose; Rubber Gaskets and Sheets; Hose Couplings and Accessories; Rubber, Metal, Fabric and Teflon Expansion Joints.

View our certificate here:

UIP International Inc Certificate ISO


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