Compressed Air Tubing

Most of the time designing this system i prefer to provide a seperate console for each control function/Valve rather providing a Centralized Panel .Still Long pu tubes comes into the scene . So problem remains the same ,yes a little less.

By the way how old the system-set-up is ?

It has been setup 13 years back. And this problem unsolved for years.

In that case contact the supplier as per your process requirement coz even i have to ask my vendor for the same.

Well if there is a requirement and your budget allows , go ahead with the idea of shifting Solonoid valves near to them , coz in the meantime your whole system will get renewed as well,(its been 13 years). Involved cost implication will be a big issue , equivalent to a new system .

Otherwise , Change all tubings only along with their connectors and accesories ,with precise supervision keeping this prob in mind . Being in Operation & Manitenence dept. it is not easy to change the system-type, your vendor may help in this .

Check page 13. The RCS-90 local control module can be installed at the point of use and be controlled remotely. It is the square box at the bottom of the page.

Hi all,

One of the option is to shift the solenoid valves near to the point of use, but as you said there is cost implication. Thanks for the advise.

To Mr. Jaguar, the RCS-90 local control module looks interesting. Basically how it works? It needs to be installed with PMC-1. Is it something like a signal receiver where parameters i.e. pressure, temperature and flow rate will be measured being installed upstream of any valve panels. Is it can be installed numbers of tubes in series for each box or only for single unit. Thanks for the info

Thanks

The PMC-1 is a complete unit with solenoid valves installed. The RCS90 is just the solenoid valves, 12 volt as I recall but verify with the manufacture. They can operate with as little as a single 12v, 20 milisecond pulse or progressivley longer pulses up to constant 12 volts. The PMC-1 output signal to the solenoid valve set, either the self contained or the remote, is designed to operate within those parameters, either as a fixed setpoint with adjustable hysteresis (speed to setpoint and error correction) or, with the ramp option, capability of adjustment of "speed to setpoint" of between immediatley and 7 days. In case you require intrinsically safe operation, there are PMC models, PMC-IS and remote control valve sets, RCS90-IS, available for those applications.

When I was still with Leslie Controls, over 10 years ago, we relied on urethane tubing from these guys. I as development technician, put it through a multitude of temperature, pressure and expected chemical tests (including sour gas, as some of our IS units were umployed by Con Edison in New York to control their natural gas valves under their streets using gas tapped from the pipeline to provide the pneumatic source to the solenoid valves) I even installed it on an air suspenssion kit for my car and it has indured about 15 years of road use both hot climates and ice/snow/salt.

there are compressed air tubing in the market today which are of rigid construction, such as the fire resistant tubing,of SMC brand (not of PU type). these can sustain high pressure (150psig) high temperature and design for aggressive environment. i've been using these kinf of tubing in our sugar mill plant and reduce the downtime and maintenance work. PU tubing are once used, and good only for clean and controlled environment. after replacing the PU tubing with fire resistant one, problem solved.

hope i have contributed one way or the other.

Use Nylon Tubing instead of PU for all the long lines that you need to bundle together.

Hello,

The main advantage of siting the valves near to the actuators, is the air saved by not filling and emptying the tubes. On long tube runs this can be significant. It could be, you could carry out this modification to your plant a valve at a time thereby spreading the cost. The air savings, will help to offset the cost of the valve move and be ongoing for the life of the plant.

There is a tube that is used in Chemical Plants, Steel Mills etc. and is a plastic covered aluminium that is bonded into one piece and can be used with Compression and Push Fit fittings. It is also available with a copper tube inside but is higher in price.

Best of luck with resolving your problem

John

I think you would have longer life and higher flow (larger inside diameter) with Nylon tubing. Black is the best color if the tubing is exposed to ultraviolet light. Some mines use polyethylene lines for long runs on dust supression controls. It does not bend as well as Nylon but is durable and inexpensive.

Thanks for all the comments. Really appreciate it. They are helpful.

Dear

As you said that the panel is used for the knockers it happens most of the times that the connections get loosed after many shocks of the knocker cylinder. So the best solution is to use the nylone tubing with the proper connectors which are usualy the main cause of leakage. We have the same system installed at our plant at cyclones. we have distributed our 16 knockers in chucks of 4 sets each being operated from a single panel very near to the knockers. It is working well at our plant.