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  1. controlnovice

    NEC Code requirements: Are all really necessary?

    I've used the NEC for a good 20 years of my career, but the last 10-12 years or so, I really haven't had the need. My use of it was for industry, not residential, so I really don't know everything that's required for residential. A few months ago, I wanted to help my father replace his...
  2. controlnovice

    Water Meter Billing

    I volunteer for a water utility system in the mountains of Colombia, S America. All of us are volunteers. It's community of about 190 houses/farms that gets water from a mountain stream. The government has asked us to install water meters on each house, which we are doing now. But, they don't...
  3. controlnovice

    Another water pressure problem in Colombia

    Another water pressure problem in Colombia. The lines in the picture represent 1/2 inch PVC pipe. Point B to C is about 50 meters. Point C is one user. The 4 branches leading 'down' are 4 other users along the line. We don't know what the distance between A and B is. A is connected to a...
  4. controlnovice

    Loss of Pressure - Water heater turns off

    I'm a Electrical/Instrument/Controls Engineer in Colombia, S. America. I volunteer for our local water system, up in the mountains helping with design and changes to the system. We get our water from a creek, that then flows through a settling tank to knock out any heavy sediments, then the...
  5. controlnovice

    Chlorine Tank/Distribution in Water service in Colombia, S. America

    I live in Colombia, South America. I was an EE and Controls Engineer in the US for 30 years. I volunteered for our local water system where we live. We're at 1700m altitude outside a small village. I've been able to fix several problems in our water system, but I'm not sure about this design...
  6. controlnovice

    Business Class Tray Hinges

    Ok...I know not really aeronautical...but I've been trying google searches and probably not using correct terms to find what I'm looking for. I'm building some cabinets and on one side, I want to build a tray that, when stowed, fits up against the side of the cabinet. To use it, it would...
  7. controlnovice

    Auto shutoff Valve on Loss of Pressure

    I have some property in South America and we loose water at least once a week. Once the water returns, we need to flush the system for at least 10-15 minutes to clear all the dirt/mud out (as they do repairs, it get's filled with earth). We don't drink from this source.... I'd like to not have...
  8. controlnovice

    ISA100 Wireless vs WirelessHART

    Anyone have experience with the two wireless network systems for instrumentation? Our company is investigating the two. Seems like I've heard batteries dying fast on the ISA100 devices, but I don't recall where. I've read the comparison documents while searching Google, but was hoping for...
  9. controlnovice

    Gravel Driveway Grading

    I have some retirement property in the foothills of the Andes in S. America. The driveway from the main road to the house is about 70-80 meters at about a 25-30 deg slope (straight up!). It is dirt and gravel and we are starting to get wheel ruts in it. It did have some grading to it, such...
  10. controlnovice

    Residential: 3ft in front of panel

    This is an issue we have in our home. We have a condo in a 6 unit building. Condo was built in 1910 and it looks like the units were rebuilt in late 1970s, possibly early 80s. The electrical panel was placed in the same space as the laundry closet, so the panel is above one side of the...
  11. controlnovice

    Vacuum Ramp: OP vs SP

    Just about every where I worked (on batch reactors) where there is a vacuum to be pulled on the vessel, it is usually done by slowly pulling vacuum so the product doesn't foam or be brought over into the vacuum system. More often than not, this is done by ramping the output of the vacuum...
  12. controlnovice

    NFPA 70 (NEC): Safet Work Distances Prior to 1970

    Our plant was installed in 1966, with startup in 1967. We are making changes to our process which requires several changes to pumps/agitators, etc....which in turn affect the Motor starters. We found several issues with the buckets themselves, and are planning on replacing these (most starters...
  13. controlnovice

    NFPA 70 (NEC): Safe Work Distances earlier than 1967

    Our plant was installed in 1966, with startup in 1967. We are making changes to our process which requires several changes to pumps/agitators, etc....which in turn affect the Motor starters. We found several issues with the buckets themselves, and are planning on replacing these (most starters...
  14. controlnovice

    Bonding of pipe sections and bond/ground testing Frequency

    Two Questions in one post: 1) Is there any regulation/code/standard on the need for star washers (to make a 'better' bond) between two pipe flanges....in pipe carrying liquid hydrocarbons (monomers, in particular)? I always thought that the flange bolts themselves were good enough to bond the...
  15. controlnovice

    Net Heating Value or High Heating Value

    I'm a bit (well, ok, a lot) confused on when to use NHV vs HHV. In particular: working on a Flare project where we have to keep a minimum of 300BTU/scf of vent gas to the flare. If we are sending N2 (no BTU content), we need to supplement with Natural Gas. The gas provider has indicated their...
  16. controlnovice

    Mass Flow Measurement of mixed vapor

    We have an application where we need the Mass Flow measurement of a mixed vapor. Unfortunately, we don't know the concentration of each of the gases but we know it will can range from 100% N2 to 80%Butadiene, 15%Pentene, and 5% N2. Looked at Ultrasonic flow (Panametric), but were told the N2...
  17. controlnovice

    Bridge Failure

    Interesting News: China Daily via Reuters People inspect the scene where a bus dropped at the collapsed Wuyishan Gongguan Bridge in Fujian province, China, on Thursday, July 14.One person died and 22 were injured after the bridge collapsed Thursday morning in east China's Fujian Province. No...
  18. controlnovice

    Bridge surface repair

    Not sure if these question belongs here or in the concrete forum. I have to cross a bridge everyday going to/from work. A few months ago, the signs went up indicating bridge surface work was going to be done soon. Sure enough a week later, there were crews out there with some kind of manual...
  19. controlnovice

    VFD High DC Bus Voltage

    Have a 480Vac, 200HP well pump (motor and pump in well) driven by VFD. Distance between VFD and motor is 1300 ft using buried armoured cable. Sorry, don't have cable size yet. We have a bypass contactor around the drive, and the motor/pump starts and runs without problem using it. Original...
  20. controlnovice

    Redundant Instrumentation

    Is there any standard/code which indicates that redundant instrumentation needs to be different technology? For example: redundant level would need to have radar as one, and DP as the other? ______________________________________________________________________________ This is normally the...

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