How do I select the proper hose?

Several things must be known before the proper hose can be selected for any hose application. The acronym STAMPED can be the key to having the required information in most cases.

SIZE - Inside Diameter, length, (and in some cases Outside Diameter).

TEMPERATURE - Internal and External; normal, minimum and maximum.

APPLICATION - What is the hose supposed to do on the equipment?

MATERIAL - The product to be conveyed.

PRESSURE - Normal working pressure, burst pressure.

ENDS - Are couplings needed, what type, size, thread?

DELIVERY - When and where is it needed?

How do I store hose properly?

Hose life can be affected seriously by the manner in which new hose is stored before being put into service, or used hose stored between jobs.

Hose should be stored in a flat coil. Be sure no kinks are left in the coil. Lay it on the floor, a shelf, or a table or long-length hose may be stored on a reel. If hose is non-reelable, store it in straight lengths.

Hose should be stored in a cool, dark, and clean environment protected from high temperatures.

You may also protect hose from ozone by storing it away from electrical or ozone-generating equipment, preferably in the dark.

Maintain good ventilation.

How many hose clamps do I need?

When connecting hose or ducting to an outlet, use this simple rule of thumb:

When the diameter is four (4) inches or less use one clamp.

When the diameter is four (4) to twelve (12) inches use two clamps spaced about an inch apart.

When the diameter is twelve (12) inches or greater use three clamps with a spacing of about one (1) inch apart.

Flexible Ducting Definitions

PITCH: Distance between the centerlines of adjacent wires when the hose is in a fully extended position.

MINIMUM BEND RADIUS: Minimum radius (at centerline of inside diameter) to which hose can be bent without kinking or flattening.

COMPRESSIBILITY: Minimum length to which one foot of hose can be compressed lengthwise.

CRUSH RESISTANCE: Pounds per foot required to deform hose to 50% of normal diameter.

ABRASION RESISTANCE: Characteristics of the material being handled---velocity, temperature, size and shape of conveyed particles, etc. in combination with hose characteristics and configuration, determine the degree of abrasive action.

How do I connect a duct of an outlet?

With most plastic hoses you can skive the wire out of the wall of the hose. This is easily done with the following three-step process: 1.) Fit hose over the outlet, 2.) With a sharp utility knife carefully cut a long side of the wire helix, 3.) With wire cutters cut the wire and remove it.

Tools needed: safety glasses, utility knife, wire cutter, pliers.

Do you have any safety recommendations?

Absolutely!

Hose assemblies must be inspected prior to each use. Worn out fittings, attachment devices, hose and accessory items must be replaced. Retaining devices (safety devices) such as clips, cables or chains must be used. Clamps must be checked regularly to the specified torque found in the product literature. Under no circumstance should any coupling be disconnected while under pressure unless the coupling is specifically designed to do so. Disconnecting couplings under pressure could result in serious injury or death, and destruction to property and equipment.

For ALL HOSE ASSEMBLIES IN USE adhere to B.E.S.A.F.E.:

Beware Hose assemblies when used improperly or in the wrong application can be dangerous. The maximum working pressure shown on the hose is not an indication of the working pressure of the assembly. Based on the hose, fittings and attachment method used all assemblies should be permanently marked with the designed working pressure and the intended media. The assembly working pressure should be permanently displayed. Hose assemblies must be used for the intended service only. Never alter manufactured product or substitute component parts.

Eliminate Hazardous conditions by inspecting, maintaining and testing hose assemblies. We recommend that all hose assemblies be tested in accordance with the hose manufacturer's specifications. The application determines the regularity of the re-testing schedule.

Secure and inspect hose, fittings, clamping devices and safety accessories before each use. Never take for granted that the coupling or attachment devices are properly installed.

Always inspect and re-tighten the bolts of any bolt style clamping device to the manufacturer's torque specifications.

Fittings, hose and clamping devices that are worn out or damaged must be removed from service.

Educate your employees about the proper use, care and potential hazards of hose assemblies. Set up an inspection program and assign responsibility for regular equipment inspections.

***Thread Charts: JIC - SAE, Metric/International***

Chemical resistance chart for rubber compounds used in hose and metals used in couplings.

Natural Rubber Latex Tubing Specification Sheet

Chemical Resistance:

• Strong Alkalies - Fair
• Weak Alkalies - Good
• Strong Acids - Poor
• Weak Acids - Good
• Petroleum - Poor
  
  Physical Properties:
• Tensile Strength (psi) - 3500 min.
• Ultimate Elongation - 750% min.
• Hardness (Shore A) - 35 +/- 5
• 100% Modulus (psi) - 125 max.
• Specific Gravity - 0.97 max.
  
  Ozone Resistance:
  Poor
  
  UV Resistance:
  Fair
  
  Low Temperature Flex:
• Brittle: -67 degrees F
• Flexible: 0 degrees F
  
  Recommended Sterilization:
• Steam Autoclave 30 minutes @ 15 psi
• Ethylene Oxide
  
  Protein in Natural Rubber:
  Less than 50 micrograms/gram. Fifty ug/g is detection limit of ASTM D5712-95.
  
  Maximum Recommended Operating Temperature:
• 212 degrees F intermittent
• 158 degrees F continuous
  
  Standard Tolerances:
• Inside diameter:
  • +/-0.015 inch on sizes up to 3/8 inch, proportionately greater on larger sizes.
• Wall Thickness:
  • 1/32 inch and 3/64 inch +/- 0.007 inch
  • 1/16 inch and 5/64 inch +/- 0.010 inch
  • 3/32 inch and 1/8 inch +/- 0.015 inch
  • Wall thickness greater than 1/8 inch are gauged on the outside diameter tolerance.
  
  
  Natural Rubber Latex Tubing meets or exceeds the physical properties of Commercial Item Description A-A-50247C Type I Class 1,2, and 3, Type III, Type IV, and Type V Class 1,2, and 3 which replaced Federal Specification ZZ-T-831D. Tubing is in compliance with USP Biological Classification IV.
  
  We support the world-wide goal to eliminate the use of ozone depleting chemicals. We do not knowingly use a Class I or class II ozone depleting chemical as identified in the U.S. Clean Air Amendments of 1990 in the manufacturing process of our natural rubber latex tubing.