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Julia Austin

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Everything posted by Julia Austin

  1. No, the winch needs to be stabilized by a vehicle so the cable can be level-wound properly. This prevents cable damage. However, the vehicle alone cannot hold the lifting loads. The base plate of the winch must be secured to the winch anchor to prevent the vehicle from moving.
  2. No, use of the five-part line requires 750 feet of cable. The five-part line ensures equal distribution of the tower lift load across the base plate.
  3. The NRG 60- and 80-meter towers employ the same diameter tubes and show equal performance from a flow field standpoint. We have not yet compared the stability of sensors placed on lattice towers vs. tubular towers.
  4. Please see page 89 of the 80m Installation Manual to obtain information about wind and ice load requirements. A thorough site assessment conducted by a professional civil engineer can help ensure compliance with local conditions.
  5. The lifter cables are transferred to the anchor after the front guy wires (those on the winch side of the tower) have been attached and the tower has been plumbed.
  6. Hi - to access SDR's data filtering, go to the Site menu, choose View Database, pick the site number and click OK. There is a filter button on the lower left side of the screen. Click the Filter button, and then Create New, and you can create whatever type of filter you want for individual channels or groups of channels. Let me know if I have misunderstood what you need.
  7. At this time, no. The lighting system must be monitored separately because the NRG data logger does not support communications to ArgusON National Operations Center.
  8. The complete obstruction lighting package, including the lights and integrated PV power supply) is provided by Flash Technology, using Dialight manufactured lights. Electricity loads AC DC Top beacon 12 watts in flashing mode 12 watts in flashing mode, 24 watts in steady mode Side markers 6.8 watts each 3.5 watts each Controller 4 watts 4 watts Monitoring unit 7 volt-amps 7 watts TOTAL 36.6 watts 30 watts
  9. The FAA has described specifications for photovoltaic (PV) systems used to power obstruction lighting systems in Engineering Brief No. 76. Specifically, it requires a minimum of 7 days operational autonomy with little to no recharge of batteries. Our systems were designed to comply with this standard. In cold weather, cloudy or snowy conditions, the batteries could drain more quickly. This is why we have included the battery monitoring service in our complete lighting system.
  10. The PV power supply is designed to be mounted to the weather-proof pallet used to ship the integrated lighting system. An analysis of soil stability is an essential part of the pre-installation site assessment. Please review Appendix B of the 80m XHD Manual for an explanation of anchor selection and soil assessment. If you are installing on solid ground, a concrete base for the power supply system is not necessary. If you are installing in muddy or damp conditions, it?s possible to pour a concrete pad, but keep in mind that these conditions may also pose a challenge in anchoring the tower.
  11. Yes, you can adjust guy lengths while lifting and adjust the tensioning as needed. The magnitude of the tension forces ? 375 lbs for the 3/8 inch cable and 255 lbs for the 5/16 in cable ? requires use of a mechanical assist. We used a technique described in the ANSI standard, the Tangent Intercept Method, which is a line-of-sight method. More information about this method for tensioning is described in the NRG 80m XHD TallTower Installation Manual and Specifications: http://www.nrgsystems.com/TechSupport/Documentation.aspx
  12. We provide an autonomous system of batteries and photovoltaic (PV) panels, along with an integrated controller and monitoring system. Our power supply was specifically designed to meet the needs of this fully integrated lighting system. We offer two power supply solutions ? one for customers in northern climates with lower sunlight levels and another for customers in locations with steadier, fuller sunlight. For more information, please contact our sales department.
  13. Yes, the lifter lengths put a slight curve in the tower, similar to the 60 m XHD but not as pronounced. Once the tower is vertical, it is plumbed.
  14. The 80 m ginpole was designed with two jumper struts to improve strength and durability. It is likely you?ll be able to use the ginpole many times and for many years, but it is dependent upon the complexity of each installation. After each tower raising and lowering, we suggest checking your gin pole for wear, including the proper alignment and functioning of each component.
  15. Raising and lowering the tower requires two pulley-block lines and an additional ?dead end? line affixed to the gin pole rocker plate. A five-part line is necessary to ensure equal distribution of the tower lift load across the base plate. Without the five-part line, the two-fifths (2/5), two-fifths (2/5), and one-fifth (1/5) load distribution from the top to the bottom of the rocker plate is disrupted and can result in gin pole failure.
  16. A recording of the 80 meter installation Webinar is available to download - if you are interested in receiving download credentials, please send an email to: webinar@nrgsystems.com
  17. A recording of the 80 meter installation Webinar is available to download - if you are interested in receiving download credentials, please send an email to: webinar@nrgsystems.com
  18. A comparison of the two towers can be found here: http://what.nrgsystems.com/downloads/webinar/80m_v_60m_tower_comparison.pdf
  19. The NRG 80m XHD TallTower Installation Manual and Specification - Rev 1.07 can be found here: http://www.nrgsystems.com/TechSupport/Documentation.aspx
  20. Anchor requirements are site specific ? soil types must be analyzed as part of your pre-installation planning process. Correct anchor selection is extremely important to the integrity of the tower structure. It must take into account soil type, maximum winds expected, icing and other weather conditions, plus include a suitable safety-factor. Please review Appendix B of the 80m XHD Manual and, if you aren?t sure what anchor-types are required, please speak with a civil engineer to ensure proper selection and installation. The 8-inch double-helix screw-in anchors are available to purchase from NRG Systems as an option. Screw-in anchors are commonly used for normal clay soils without rocks.
  21. The NRG Systems installation team used a Foster hydraulic power unit (HPU) to power the winch. A customer may use a different HPU provided that is supplies a minimum flow rate of 8 GPM and a minimum pressure of 2100 psi.
  22. This new winch is currently not approved by NRG for use in raising/lowering 60m XHD towers. With the 80m tower, a longer winch cable is needed to accommodate the five-part line configuration. Raising and lowering the 60m tower with this set-up would require using the outermost wraps of cable, thereby exerting more force on the winch. In addition, the three-part line configuration of the 60m tower would result in higher forces.
  23. The bolted joints add significant axial compression strength to the tower joint. Based on our experience, the most frequent cause of tower failure is due to excessive tower ice loading. In an icing event, the weight of accumulated ice on upper levels of the tower increases loads on lower level tubes. At a certain level of force, tubes will ?self flare,? meaning the tubes literally compress onto one another. This compression results in a shorter tower which lessens guy wire tension. The tower guy wires ?sag? and the structural strength of the tower is compromised from improperly tensioned guy wires. At this point tower failure becomes more probable. The bolted joints minimize the risk of this happening. They also make for a more rigid, easier-to-manage tower during installation.
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