Search results for query: *

The Detroit Wastewater Plant used plane steel piping on its air system. The blower was rated at about 105,000 scfm at 7 psi. I am not aware of any problems with the piping, and it was used for years.

Just like everything else in life there are pros and cons to incineration. It is the best way to sterilize. It can break down some toxic waste compounds. It has a good waste reduction ratio. It may be possible for the combustion to produce enough heat so as not to require fuel. The ash may...

If you play around with the air volume you better check the delta T of the water through the coil. Although that would be one way to increase the cooling from the coil. Increase the air and water flow. Only with increased water flow you will probably still need to increase the transfer rate...

I concur with Operahouse. A bubbler would be the simplest method that you can use. If you take the time you could make a new face for the pressure guage to read in feet of water. Or even purchase a guage that is calibrated in feet of water. The second simplest method would be to use...

Can someone tell me? Any design that I have seen using a silicone junction for temperature sensing always uses a transistor with the base tied to the collector. My question is why not just use a 1N914 diode?

Both of our units were lithium bromide. The steam fired unit was 118 ton and I had no experience with it at all. The other units were direct fired units that could produce hot and chilled water in the summer, and hot in the winter. I had good luck with the direct fired ones, but I knew them...

If moisture carry over is the problem then it seems to me that the duct would have the same exposure with the same results.

We had a York ER (steam fired) at work. About 30 years old. Had been rebuilt once after about 20 years. Needed to be retubed. Also had a pair of York direct fired units. York told me normal expected life was about 20 years. That is with proper maintenance.

I would start with trying to get the make and model for the hydraulic parts, and do an internet search to find out what you have. Some of the manufacturers are pretty good about giving information for designing with their products. You can use a gear pump for a motor. If it is in good...

Lets start with the gas engine. Most of the utility motors that go on lawn mowers, snow blowers, roto tillers etc, are governed at 3600 RPM. So you have a starting point. Since this is a (I just wana play) venture do you have any idea how much you would want to spend? A starting place for...

Back in the 70s there was a little Italian furniture manufacture. His dream was to make a competitive motorcycle for road racing. He made two sizes, 50cc and 125cc. If memory serves me the 125 put out 47 hp at 8,000 RPM. A sample bike made it to the states for an evaluation by one of the...

Since the power is supplied by a hand crank then you will probably want a piston pump. I don't think that gear pumps would be efficient enough. I think that I would down grade the pump RPM to no more than 120, unless you are going to have a gear increase from crank to pump. What kind of a...

If you are feeding back all the displaced oil from the front end of the cylinder it seems simple to me. Subtract the area of the front end from the area of the back of the cylinder. That gives you how much oil is needed to move the cylinder forward for each unit of stroke after taking into...

Why can't you just use the volumn regulators to modulate the VFD?

I'm sorry I didn't mention that the MAU had a duct pressure controller on it. The air flow is controlled by a pneumatic controller that operates an inlet damper on the fan. The fan is a backward inclined double inlet type fan. The inlet damper was modulated to satisfy the amount of air that...

Don't the rules also cover using CO2 detectors to set the level of ventilation air? I'm sorry I don't know the specifics.

ChasBean1 said something about the water that was bothering me too. How can you have water at 138C? If it is that hot shouldn't it be steam? I wonder if the coil supplier looked at the installation site before he sold the coil? The pin hole failure sure sounds like a weld defect to me...

That is a beautiful discription of the equipment. The original plant was put in service in about 1940. Still has some of the original HVAC equipment. As the plant expanded the design philosophy changed. Most of the expansion was added on as individual pieces rather than any grand scheme...

Most combined sewer systems has someone that can give you, or point you to the information you need for the design flows. As Dicksewerat said you can use weirs for the overflow. You can use some type of an inflatable dam, or a fancy lift gate. The simplest solution is usually the best.

Is there a fire hydrant in the area that could be a source of water to flush the system every few days? That would wash the solids out of the sewer to the main. The flushing should, at least, minimize the production of H2S. Unless the sewage plant can't handle the lower solids that would...