Combination Air Relief Valve Sizing

I am trying to size an air relief valve on a 12-inch water main. My specs have no explanation for sizing. I am having a hard time finding anything on google or other sites. Can anyone point me to an industry standard? I routinely design water mains from 8 to 48-inches and would like an industry

Bobber's 106-MPH DIY Motorcycle

We featured a few home-built bikes by 69-year old Bob Decker a few years ago that were built to look like a Simplex and an Indian Chief yet used a conventional V-twin lawn mower engine with a centrifugal clutch. Now 72-year old Bob Decker offers his latest creation from scratch, another throwb

Boring for Water

please tell can we select a point for boring by visual inspection. we know the approximate depth of groundwater found in that area but our four trials ended in failure. three of them due to mistake of labour and in the fourth bore we encountered big stones.

Cylindrical Concrete Tank Design

Hi,

Does anyone have a design example of a reinforced concrete tank done to the British Standards?

The Tanks can have a flexible base or a fixed base. The Dimensions are not critical at the minute.

I just need to know how to calculate hoop stress and then the reinfor

SpaceShipTwo Makes First Flight With Crew Aboard

From Wired:

SpaceShipTwo staged a dress rehearsal for its glide flight and flew with a crew for the first time. Anticipation mounted yesterday as word spread that SpaceShipTwo, attached to its mother ship Eve, departed the Mojave Air and Space Port. Many, including us, were anxi

Ring Main

Dear All

For 11KV feeders we have open ring main system and each feeder is provided with earthfault & overcurrent protection .In addition to this each section of the cable between ring main unit is provided with earth fault indicator(EFI). recently it is observed during fault at substation

WISE Discovers 95 New Near-Earth Asteroids

From Discovery News - Top Stories:

It's WISE to know your neighborhood, especially when countless pieces of rock are flying around. Millions of tiny meteors bombard the Earth every day, but burn up in the atmosphere long before they can cause anything other than a pretty light i

Gallery: People Survived These Dire Air Crashes

From Wired Top Stories:

Nobody likes to talk about airplane accidents, but it turns out most are survivable. We here at Autopia put together some examples of accidents where sometimes mistakes were made, other times amazing skills were displayed, but every time passengers survived

Model of Supersonic Car Unveiled

From BBC News - Science & Environment:

The British team hoping to drive a car faster than 1,000mph has unveiled a full-scale model of the vehicle. The 1:1 replica of the 12.8m-long (42ft) Bloodhound SuperSonic Car (SSC) is the result of three years of aerodynamic study. The m

Nations to Seek Clean Energy Cooperation

From Yahoo! News: Science News:

Energy ministers or senior officials from 21 nations are gathering in Washington, DC Monday for a two-day meeting aimed at finding ways to work together on clean energy amid an impasse in drafting a new climate change treaty. The US Energy Departm

The Minister's Treehouse

From Neatorama:

Photo: Chuck Sutherland [Flickr] Seven years ago, Horace Burgess prayed and received divine inspiration. God said unto him "If you build me a treehouse, I'll see you never run out of material." And so Horace built, and built, and built: The treehouse has 10 floo

COTS for Cyber Security

All kinds of off-the-shelf technology — both commercial and consumer — has already been adapted for military projects in the U.S., thereby saving untold dollars. If COTS technology is implemented to fight the cyber war, more savings will be realized. What's your vote: Yes or No?

The pre

On the Fence About Net Neutrality?

On June 17, 2010, the Federal Communications Commission voted to open a Notice of Inquiry that will solicit comments on what the commission should do with regard to "net neutrality." Proponents of net neutrality want all Net traffic to to be equal with regards to transmission and access. Opponents s

Solar Power

Generally what are output voltages of solar inverter for the grid connected system? Because we have to connect it to grid so for that we have to have some specific voltages! I want learn about Grid Connected solar Power please suggest me any site for this! Thanks a lot. .