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Campbell Coupling Selection Guide
From the Selection Guide below, choose an appropriate coupling based on the hose type and application working pressure. Click here for the Coupling Selection Guide PDF .
NOTE: The data below is based on years of hydrostatic testing. All tests are performed to the ASTM D380 standard. We employ a safety factor based on the Rubber Manufacturers Association (RMA) recommendations of 4x working pressure (WP) for most hoses with the exception of 3x for water up to 150 psi., 5x for LP gas and 10x for steam. This means that any hose with a 4x safety factor is tested to 4000 psi., or beyond, in order to establish a 1000 psi. rating.
Temperature De-Rating Chart
When should 500 psi. be 320 psi.? When it’s hot!
The effect of elevated temperature on any hose system is significant and often overlooked. Since the lay line of most hoses indicates the maximum WP and the maximum temperature, it can be assumed the hose assembly will achieve both at the same time. Hot hoses get soft and are more pliable, hampering the ability of the attachment to hold the couplings securely on the hose. Since Campbell’s pressure ratings are established by testing at 70F, we established a separate pressure de-rating chart for elevated temperatures.
De-rating factor applies to hose system pressure ratings
How the De-rating chart works:
The chart lists temperatures across the top and hose type down the left column. Based on your hose system application, locate the appropriate de-rating factor and multiply it by the hose system pressure rating in the pressure chart above.
Steam hose example:
Rubber hose example:
* After the de-rating is calculated for the fitting and attachment, check maximum working pressure of the hose. The hose system should never operate at a higher pressure than the lowest rated component. (Example: 150 psi rated hose with 500 psi rated coupling and attachment at 90°(F). The de-rating factor is .90. So, the newly calculated pressure rating is 500 x .90 = 450 psi.. Since the hose is rated to 150 psi., then the maximum working pressure of the system is still 150 psi.
On a typical summer day at any construction site, compressors crank out high pressure air to operate tools and equipment. Between the weather and the compressor motors, the compressed air gets dangerously hot. So hot, that those hoses can no longer safely operate at the intended pressure rating. Our de-rating chart shows that at 150°(F) the hose system should operate at 64% of the pressure rating given for 70°(F). That’s when 500 psi,. should be 320 psi.
Know the safety limits of hoses. Use the Campbell de-rating chart when specifying hoses at elevated temperatures.
Dynamic Force Chart
Dynamic force is the energy created by the pressure relative to the diameter of the hose.
Did you know that a 3" air hose at 500 psi generates over 3500 pounds of end force? Yes, my friend, that’s some serious tonnage.
Don’t blow an end off. Use the pressure rating chart and coupling selection guide to choose the appropriate fitting for the job.
Dynamic Force Chart – measured in pounds per square inch (lbs.)
Spill Rate / Water Discharge Table
Why should you be concerned that it only takes 10 minutes to fill a backyard swimming pool?
1600 gallons per minute flow thru a 3" hose at 200 psi. That’s 16,000 gallons in 10 minutes – enough to fill a standard size backyard swimming pool. Unless your job is filling swimming pools, then you should be concerned because 10 minutes is how fast a fitting ejection becomes an EPA nightmare. What’s in your hose?
Avoid the nightmare. Use the pressure rating chart and coupling selection guide to choose the appropriate fitting for the job.
Spill Rate / Water Discharge Table – measured in gallons per minute (gpm)*
*The above values are for the flow through a 100 foot length of hose with a straight smooth bore rubber hose. This table is a calculated estimation. Differences in actual flow rates may be affected by hose and environmental conditions.
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