Thanks. The existing signs, were designed and the bases installed by the CCC work crews in the mid to late, 1930's. They are considered, historical, and a real pain to modify.
Plus, in the 80 or so years they have been there, none of them have been hit from the roadway. There have been a...
I'm kind of stuck between the rock and a hard place.
I'm trying to design to current standards, which require the breakaway bases. The Rangers want to keep the historic Forest Service Bases, which are raised pads made mortared rock. And admittedly they are attractive.
They are also...
I tried a google search for "fhwa vehicle attenuation", and didn't get anything that made sense.
I was hoping someone who does enough geometric design, or traffic engineering might know offhand which standards apply so I could narrow down the search.
I work for the Forest Service, and am working on developing plans to install new signage on approximately 45-miles of unpaved Forest road.
The speed limit is posted at 35-mph. There are about ten of the old style Forest Facility signs, that are installed in raised mortared rock platforms...
Here's my reasoning:
If I assume that the solar panels are 75% efficient, then it should take approximately 16-sf of solar panels to equal the solar gain of the 12-sf of black body absorber that the original pipe is.
Since, the solar panels are direct connected to the resistive heat...
What gases would be expected to off gas from a vault toilet.
For those who may not know: A vault toilet consists of a reinforced concrete vault, with an epoxy lining, with a toilet seat assembly bolted to the top slab of vault. Typically a precast concrete building is placed on top for...
The combustible gas is methane, which is lighter than air. And the vault is vented. Thus, the methane concentration can't get to the levels they are explosive or combustible.
However, I'm not sure how corrosive methane is. I do know that ammonia, and the hydrogen sulfide, are corrosive.
I...
There will be no thermostat. The Solar panel will be direct connected to the resistive element, and the element sized to limit the total heat gain, based on the maximum output of the solar panel.
We are trying to mimic the thermal cycle, which would occur with an exposed semi-gloss black...
I guess I should have given some more information on what Vault Toilets are:
Vault toilets are used in areas with out water/sewer and usually without power.
The vault is a waterproof concrete vault with an epoxy lining, which holds, the waste. The toilet is installed on the concrete top...
I'm working on developing an electric heater to be inserted into a 10-inch id polyethylene pipe, that is the vent for the vault on a vault toilet.
The vault is normally vented by the convection generated in the black pipe as it heats in the sun. Which warms the air and causes air to flow in...
I'm working with a Design Consultant, to solve a problem with a low head dam in a wilderness area.
He is proposing to reline a stilling basin, at the diversion to a micro-hydro power plant with welded mild steel. (Long ugly story of multiple, un-engineered band-aid fixes over the last hundred...
Not sure if this is the right group to ask, but I think you will know either the answer or who to ask:
One of the hydrologists working on a mine tailings environmental study just walked in and asked if I had a table that shows the solubility of various metals as a function of the pH.
I found...
Thanks, guys. I am pretty sure that the code has been 75-foot travel distance forever. But, I still don't know for sure. So, I will probably pay for the two new cabinets out of my budget, rather than argue with the Landlord.
We have had a few rough times this year, so I can do it as a good...
The current and last several versions of NFPA 10, require a maximum travel distance of 75-feet to fire extinguishers in commercial builings.
Does anyone have a copy of the code in force in 1992, that can tell me what it was then?
I have a leased building that has two hall ways with fire...
Big Inch, you seem to miss the point and have trivialized the whole thing.
The screen sizing is easy, and so for that matter is the diffuser manifold design. But, I work with and for biologists, for whom the math is intimidating, and who want to rebuild whatever they saw in a catalog. Not...
I am designing a fish screening system for a gravity irrigation deiversion from a natural stream.
It is basically a wedge wire drum, 6-ft long, 18-in diameter, with 0.0675 wires and gaps. It is similar to a well screen, with a pvc diffuser inside of it with a bunch of 7/8-inch diameter holes...
The pipe is a 15-inch dia PIP (plastic irrigation pipe, class 100. Essentially a plastic potable water line pipe with a less stringent spec on the allowable leakage at the gasketed joints, and lower surge pressure rating.
Back when I was building potable water systems, the District I worked...
Thanks for the response.
I got with the "Building Official" yesterday. He was surprised I even asked the question. Apparently they allow the power feeds for the irrigation systems to run in the same trench as the pipe all the time, and don't even requre hazard tape, under the theory that...
Does anyone know of a NEC requirement for horizontal seperation on direct bury conductor?
I am installing a 240V, 3-phase, 20-amp, direct buried feed from a pump to a subpanel at the pump inlet screen. The screen is a mesh drum that rotates, and has a pump to feed a spray bar, that rinses...
If possible, visit the campuses, and meet with your major professors and probable advisor before making the decision.
A bad department, doing research you find uninspiring, or even interesting can be a small version of hell.
