Metal hose applications can get tricky. Sometimes you can have problems or failures due to the surrounding piping system or because of the way the hose is installed.
Today we are going to discuss Part 2 of the do’s and don’ts when it comes to installing metal hose assemblies in a metal piping system.
Hoses can take a great deal of damage when they are torqued. Twisting it stretches the corrugations and the fitting wells and can cause it to fail. To prevent torque, don’t install the hose off-center.
When it tries to flex, the assembly will be torqued. Do install the hose in-line with itself; called in-plain. This prevents it from torquing when it flexes, and you should stick to one plain of movement. A quick test for in-plain could be done with either a sheet of paper or a flat surface like a table.
When handling long lengths or coils of hose, it’s important to make sure the hose doesn’t get twisted. Don’t grab one end of the coiled hose and walk away or pull on one end with the other end fixed. This will torque the hose. Do coil and uncoil it properly. Roll it like a tire or pretend like it would be on a reel and try not to twist it.
When installing a hose, significant physical damage can be done to the fitting, the welds, and the braid with the various tools that may be used to install it. Don’t use a wrench or other tools on the hose anywhere but on a hexpad. Gripping the hose by the braid, the braid collar, or the threads will damage the assembly. Do use a second wrench or a swivel-capable fitting when applicable to prevent twisting during the assembly installation.
Torquing the hose during installation is common and can be an issue. If the existing piping does not have any kind of swivel or rotation, don’t use an assembly with fixed-ends fittings at both ends. Otherwise, installation could torque the assembly and strain into service.
Do use a swivel, floating flange, or union, or other fitting that allows the hose assembly to twist during installation.
Follow these tips can help maximize your hose safety and the safety of your plant personnel. If you missed it, make sure to check out Part 1 of the video series.