- Doppler for pipes - 2 Updates
- Nokia 1100 flashing of languages file - 1 Update
| Jeff Liebermann <jeffl@cruzio.com>: Sep 07 10:44AM -0700 On Tue, 5 Sep 2023 05:26:59 -0700 (PDT), Tim R >> inserted inside the pipe, where they also partly obstruct the fluid >> flow. However, they are cheaper than ultrasonic. >It's been a while since I was hands on in any mechanical rooms. But I vaguely recall we measured flow by pressure differential across an orifice. A flow meter was used for something like make-up water to a boiler, where accuracy wasn't critical and flow volume small. But for a boiler or cooling loop the pressure differential was reliable and cheap. And with 400 or so boiler rooms cost was important. Welcome to fluid dynamics and Bernoulli's equation: <https://en.wikipedia.org/wiki/Bernoulli%27s_principle> Works for any kind of fluid flow (air, gasses, water, sewage, etc). However, there's a problem with using pressure difference to measure fluid flow rate. The plumbing and sensors needed to measure the changes in pressure caused by changes in fluid flow must be designed and built into the machinery in advance. In other words, one must plan and design ahead. That's where ultrasonic flow meters are best. They can be retrofitted into almost any machine by attaching the transducers to the outside of the plumbing. No need to drill holes, insert obstructions, pitot tubes or deal with internal mechanisms (paddle wheels and turbines). Ultrasonic sensors can be temporary or permanent as needed. If you're measuring flow rate in an open channel, adding additional hardware is not a major problem. However, inside a sealed pipe, ultrasonic is best. 400 boiler rooms in one location or scattered across the planet? Drivel: I hate plumbing. -- Jeff Liebermann jeffl@cruzio.com PO Box 272 http://www.LearnByDestroying.com Ben Lomond CA 95005-0272 Skype: JeffLiebermann AE6KS 831-336-2558 |
| Tim R <timothy42bach@gmail.com>: Sep 08 05:13AM -0700 On Thursday, September 7, 2023 at 1:44:55 PM UTC-4, Jeff Liebermann wrote: > Drivel: I hate plumbing. > -- > Jeff Liebermann je...@cruzio.com Military base. Not that much different from a college campus - barracks instead of dormitories, DFACs instead of cafeterias, lots of admin buildings and classrooms, maintenance shops, etc. Most of it was ancient when I started, about half rebuilt or new by the time my 30 years was up. Interesting job as standards and technology changed through the years. |
| Wu Ming <wu.ming2@icloud.com >: Sep 08 02:01AM Bought this old phone for my parents. Unfortunately the language needed is missing. After extensive research found what I believe are the post programming files to be installed as language pack. It requires special hardware though. Walked all over the city but no phones repair booth has the necessary equipment anymore. As far as I understand phone is still popular around the world. How do they keep it up to date? Where to find a service to do so? Thanks for sharing. WM2 |
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