Screw/Worm Hose Clamp on Pneumatic Lines 1

[WinnB]

thread190-378290
1910.243(b)(2): Airhose. Hose and hose connections used for conducting compressed air to utilization equipment shall be designed for the pressure and service to which they are subjected.

 

[BrianPetersen]

That's too vague to resolve anything.

 

[WinnB]

(

http://www.oshatraining.com/compressed-air-hose-water-hose-clamp-pvc-pipe-OSHA-violations.php)

Water Hose Clamps Used For Compressed Air Hose Connections
Another very common hazard that I run across during inspections at both manufacturing and construction work-sites is the use of water hose clamps (aka worm-driven hose clamps)to splice compressed air hoses, as well as to connect compressed air hoses to quick couplers and other hose fittings.
      
OSHA Construction standard 1926.302(b)(5) states that “The manufacturer's safe operating pressure for hoses, pipes, valves, filters, and other fittings shall not be exceeded”.  There is a similar standard in Subpart P of the OSHA General Industry standards at 1910.243(b)(2), which states that “Hose and hose connections used for conducting compressed air to utilization equipment shall be designed for the pressure and service to which they are subjected”.
Most compressed air hose manufacturers utilize a crimped fitting to make their connections to fittings (see photo on the right above). But water hose clamps are not made to withstand the same pressure as the clamps and other devices used by manufacturers to make connections when they fabricate compressed air hoses. A water hose clamp can also cut into compressed air hose material easily and cause it to break. Water hose clamps also loosen relatively easy when they are pulled across the ground or floor. So improper types of clamps and connectors must be avoided because they could fail and allow the end of a pressurized hose to whip around violently and strike someone. In fact, I will admit that as a teenager (many, many moons ago), I personally felt the wrath of such an angry air hose while working as a helper in a fabrication shop.
One quick side note; in some cases, I have seen where the proper type of compressed air connectors are used, but they are not the right size for the hose (fitting is usually too large). And even though the fittings are crimped into place, they too can come loose and cause the hoses to come loose and whip around.

Screw Type or Worm Driven clamps are not rated or give pressure ratings.