Inspecting Flexible Hosing And Tubing

Hoses can connect from one object to another in the transfer of chemicals and liquids such as petrol, chlorine, carbon dioxide and kerosene. Industrial plants use chemicals during manufacturing phases, to fuel equipment or even within dry powder fire extinguishers to put out dangerous blazes.

To ensure the safety of workers and the proper operation of equipment, all equipment that transfers chemicals through hoses must be tested for kinks, leakage and signs of wear and tear. Workers must personally visually inspect hoses and couplings.

They must extend the hose and use maximum operating pressures to test the assembly of the materials. While doing this, they must maintain a safe distance and note any abnormalities to the exterior of the casing.

Discoloration can indicate material deterioration and bent hose lines can add to the further weakness of the hose’s structure. They need to be able to detect wet spots on the ground that can indicate a slow leak or the strong smell of chemicals along hose lines and around couplings.

To help them perform these inspections, they operate a video scope to allow for visual internal inspection of the hose. They then drain the hose and bleed lines using de-mineralized water.

They then insert a flexible line with a video camera attachment into the opening. Workers must study the video monitors as you check the interior hose for signs of corrosion or pitting of the hose lining.

They then pressure test smaller containers and cylinder hoses, such as on fire extinguishers, by using a hydrostatic test pump. Hydrostatic testing allows for pressure tests to find leaks by pressurizing the hoses with a liquid.

Workers can attach the pump’s flexible connection onto the nozzle or hose outlet and send de-mineralized water into the line at maximum operating pressure inside a test chamber. They then evaluate the gauge readings to see if there are any fluctuations of pressure from the liquid fed into the line.

Chemical hoses can undergo tests from 1 year to 12 year periods depending upon the type of chemical used within the hose line. Carbon dioxide hose assemblies can be tested every 5 years while dry chemical hoses can have testing every 12 years.

Flexible hosing is an ideal alternative to hard installations in many industrial applications. Stainless-steel fittings at each end make installation quick and easier.

Since the tube is flexible, there should be no need to do any complicated bending and math calculation to make sure the line extends the proper route from end to end. Instead, workers can just install it and work the flexible tubing through the available space.

As with any industrial application, however, regular inspection of the flexible tubing ensures proper performance and avoids costly downtime from unexpected failures. There are three kinds used for caustic, high-pressure, and low-pressure lines.

These types consist of plastic, reinforced rubber or neoprene, and stainless-steel weave reinforced. All three have practical uses and are installed based on considerations of cost and what media is being transported.

It would be easy to install all stainless-steel mesh reinforced, but it will also be pretty expensive. Plastic could be installed to carry high-pressure feed lines but has the tendency to burst very quickly.

The black rubber or neoprene reinforced with steel or fiberglass mesh is ideal for many high-pressure hydraulic installations. Whatever hosing is used there are three criteria to inspect; namely the fittings connection, chafing, and internal wear.

Flexible tubing fittings can be attached with either a strong clamp around the diameter or compression swage fittings. This is meant to squeeze a collar around the flexible tubing with a nipple on the fitting inserted.

After installing, workers should inspect around the fitting for bulging or imperfect fit at the fitting connection. Bulging could be from the fitting occluding the free flow of media through the hosing.

Wrinkles or crimps result from a poorly fitted fastener. Flexible tubing of all types installed on moving machinery may chafe against other surfaces.

This constant wear can weaken the tubing. Any shiny spots on rubber flexible hosing or brushed or rough patches on plastic and flexible stainless-steel can indicate chafing. BOLA TANGKAS