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Tanks @btrueblood. I did find fittings through FESTO that are polypropylene. I will probably go with that.

I work in industrial automation and we design and build machines for electrolytic tankhouse applications that tend to contain significant sulfuric acid mist in the air. We typically use a lot of pneumatics for pneumatic actuators on different parts of our machines and robot end of arm tooling...

Thanks, we will be measuring OD. Never thought of looking for markings on pipe. I'll see if our client can check the excavation.

We have just dug up a supply and return line feeding tailings from a mill to a hydraulic sandfill plant. Drawings indicated 20" steel rubber lined pipes, but after digging them up, we found they are actually HDPE. Of course, there is no documentation of the change from steel to HDPE. We need to...

we will be discharging into the fill pipe from flow control valves, so we have full control of flow. We won't be flooding the pipe. Regarding the Freud number, I'm not sure what it really tells me other than whether flow is turbulent or critical. I don't have a firm understanding on how it...

On a 2" sch. 40 pipe, I'm getting less than 20% fill based on area at 4 L/s (~63 gpm). However, this is based on the Manning equations and they're specific to water flows. They do not account for other fluids (ie. viscosity, density...)

Hi LittleInch, I believe you are correct in that the assumptions that the previous engineer used were wrong about the pressure parameter. I don't think it matters in the end. It's an interlock that isn't needed to prevent combustion. I found a parallel discussion on the same topic here...

I greatly appreciate everyone's input. My interpretation from your responses is that he previous engineer's safety design is extremely conservative. Even if the pressure climbed significantly above 80 psi, the temperature could not climb enough to reach auto ignition. Just to recap, the system...

Thanks LittleInch, I have lots to consider here.

Some clarifications: the original system was designed for open channel flow and the flow was limited to that which cannot fully develop in the pipe as long as the line never slopes upward or any obstructions are encountered. There was a failsafe PIT installed at the low point of the piping that...

Thanks SwinnyGG, These are some great insights. I finally found a reference buried into the project files on where this 80 psi figure came from. The previous engineer had found a reference somewhere that says diesel fuel can auto-ignite at 260 psi and he had picked 80 psi arbitrarily with a...

Thanks Brian, This is an interesting discussion. The design I'm working on is an extension to a previous project that was executed a few years ago, where the system was specifically designed to meter the diesel into the underground fuel tank from surface using flow control valves to keep open...

I should clarify that there will be air entrained in the pipe. Fundamentally, we are designing the system to provide open channel flow. So, air will certainly be an issue with this application. We have a pressure transmitter at the bottom of the pipe run that will signal the pump on the surface...

I'm designing a fuel distribution system for a mine with fuel piping going down a 600 m (~2000 ft) mine shaft and I'm trying to find some relevant literature on diesel auto ignition PRESSURES. I'm finding lots of information on diesel ignition pressures in internal combustion engines, but mainly...

@SwinnyGG, Thanks for the advice! You've pretty well summed up my concerns on the other connection methods. I've already accounted for the loading on the tubes. I'm good for strength on max cylinder exertion at the worst point of contact on the ram sleeve.

Hi everyone, I'm designing a type of ram for a high temperature furnace application requiring linear guidance. I have two linear guides on the top of the machine and a "push rod" at the bottom connected to a pneumatic cylinder (see attached image). I have guide tubes (grey) projecting out the...