20 Dec NHTSA’s proposal to amend FMVSS. No. to include the latest requirements in the SAE brake hose standards for hydraulic, vacuum, and. 10 Apr FMVSS specifies labeling and performance requirements for motor vehicle brake hose, brake hose assemblies, and brake hose end. With the launch of air brake hose and 25 series crimp fittings it is important to understand the Department of Transportation (DOT) regulation FMVSS
|Published (Last):||18 February 2011|
|PDF File Size:||9.29 Mb|
|ePub File Size:||12.74 Mb|
|Price:||Free* [*Free Regsitration Required]|
Parts 5 – Title 1 – General Provisions.
Requirements – Plastic air brake tubing, plastic air brake tubing assemblies, and plastic air brake tubing end fittings. Title 43 – Public Lands: Utilize a cylinder with a diameter eight times the nominal outside diameter of the brake hose excluding armor. Except for an end fitting that is attached by deformation of the fitting about the tubing by crimping or swaging, at least one component of each plastic air brake tubing end fitting shall be etched, embossed, or stamped in block capital letters and numerals at least one-sixteenth of an inch high with the following information:.
Hose assemblies with end fittings that do not permit entry of the gauge e.
Set the UV irradiance to 0. Within hours, subject the hose to the flexure test in S8. Small test cylinder, radius in inches millimeters 2. Rmvss pressure cycles on the brake hose assembly.
Plastic air brake tubing shall not rupture when subjected to 80 percent of the burst strength pressure in Table VIII for the size of tubing being tested, after fmvas tubing has been conditioned in boiling water for two hours, then conditioned in fmss at minus 40 degrees Fahrenheit minus 40 degrees Vmvss for 4 hours, and then impacted with a one pound weight dropped from a height of 12 inches.
Plastic air brake tubing shall not rupture or burst when subjected to 80 percent of the burst strength pressure in Table VIII for the size of tubing being tested, after the tubing has been conditioned in air at degrees Fahrenheit degrees Celsius for 24 hours, then conditioned in air at minus 40 degrees Fahrenheit minus 40 degrees Celsius for 4 hours and impacted with a one pound weight dropped from a height of 12 inches.
Cool the brake hose assembly at room temperature for 45 minutes. Except for that part of an end fitting which does not contain hose, every inside diameter of any section of a vacuum brake hose assembly shall not be less than 75 percent of the nominal inside diameter of the hose if for heavy duty, or 70 percent of the tmvss inside diameter of the hose if for light duty S Examine the exterior of the hose for cracks, charring, or disintegration visible without magnification.
Construct the salt spray chamber so that: A vibration testing machine that supports a brake tubing assembly by its end fittings in approximately a straight line and includes the following features:. Increase the oven temperature to degrees F fmcss Celsius and maintain this temperature throughout the pressure cycling test. A vacuum brake hose shall not 16 under hydrostatic pressure of psi S Remove the tubing and cylinder from the oven and cool at room temperature for two hours.
Title 40 – Protection of Environment. Utilize a compression device, equipped to measure force of at least pounds, and feeler gages of sufficient length to be passed completely through the test specimen.
Title 38 – Pensions, Bonuses, and Veterans’ Relief. Want to discuss your latest product or review an existing range for a new standard? Utilize an impact test apparatus as shown fvss Figure 8. Also utilize an impact test apparatus as shown in Figure 8. The machine shall be capable of increasing the pressure in the hose from zero psi to psi, and decreasing the pressure in the hose from psi to zero psi, within 2 seconds.
49 CFR 571.106 – Standard No. 106; Brake hoses.
Make the PH measurements at 77 degrees Fahrenheit 28 degrees Celsius. Title 37 – Patents, Trademarks, and Copyrights. A vacuum hose that is constructed of two or more layers shall withstand a force of 6 pounds per inch of length before separation of adjacent layers.
An elongation or contraction fmbss an increase or decrease, respectively, in the final free length from the original free length of the hose.
Install the tubing assembly on the tension testing machine and apply tension to the tubing assembly at a rate of one inch per minute travel of the moving head until either the conditioned tensile load in Table VIII for the size of tubing being tested is reached or the free length of 1066 tubing assembly reaches fmvsa inches, whichever occurs first.
Attach the other end of the hose to the fixed attachment point allowing the hose to follow its natural curvature.
Title 3 – The President. A flex testing machine with a fixed hose assembly attachment point and a movable hose assembly attachment point, which meets the dimensional requirements of Figure 5 for the size of hose being tested. The movable end has fmvsw linear travel of 6 inches and a cycle rate of cycles per minute.
Fill the container with distilled water such that the lower 4 inches of exposed tubing will be submerged when the brake tubing assembly is installed on the machine.
49 CFR – Standard No. ; Brake hoses.
This is an approximate average radius. Measure the tubing dimensions including wall thickness, inside diameter, and outside diameter, using appropriate metrology apparatus such as micrometers, dial indicators and gauges, or optical comparators. In the case of hose shorter than the circumference of the cylinder, bend the hose so that as much of its length as possible is in contact.
The weight shall be measured with a resolution of 0. The vacuum brake hose shall show no leakage in a vacuum test of 26 inches of Hg for 10 minutes.
With the movable hose attachment point at the mid point of its travel, attach one end of the hose to the movable attachment point with the marked line on the hose in the uppermost position. The ball shall fall under the force of gravity alone completely through all portions of the brake hose assembly containing hose, at an average rate of 1 inch per second.
Each air brake hose assembly shall be equipped with permanently attached brake hose end fittings or reusable brake hose end fittings. A hydraulic brake hose assemblyafter immersion in water for 70 hours S6. In addition, end fittings that use a threaded retention nut shall retain at least 20 percent of the original retention nut tightening torque upon completion of the vibration testing.
Examine without magnification for cracks.