Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations cowski on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  1. CostasV

    Battery monitoring system with ATEX certified sensors ?

    Thanks Gr8blu, all my searches seems were unsuccessful.
  2. CostasV

    Battery monitoring system with ATEX certified sensors ?

    Hello, We have a separate battery room for our [6 x 45 kW] UPS systems, housing around 250 VRLA lead-acid and NiCd batteries, with ATEX-certified lighting and ventilation. We want to install a battery monitoring system (BMS), with the main unit located in an adjacent, non-ATEX room. However...
  3. CostasV

    Screw terminal burnt

    Thank you all for your comments. Update: We have checked with a thermographic camera the wire connections inside all the rest marshalling cabinets and found no other issues. Is there anything else to prevent this from happening again?
  4. CostasV

    Screw terminal burnt

    Hi all, During an annually check we have found that inside an ESD marshalling cabinet, one of the two parallel PSU 230VAC/24VDC-40A was not working because the 230 VAC feeder screw terminals and cables (6 mm2) were burnt. The terminal plastic insulation melted, phase and neutral came to...
  5. CostasV

    Compressor vent gas injected to lower pressure network

    ...pressure regulator, I find it difficult because the regulator inlet pressure will vary from 44 to 16 barg. So, I am thinking of having a flow control valve which will be regulated to keep the rate of compressor loop pressure drop constant (at about 0,75 bar/min , equal to 0,75*23*60 = 1035...
  6. CostasV

    Compressor vent gas injected to lower pressure network

    1503-44 I use 0 degC and 1.013 bar as normal conditions. This makes our calculations be different by 5,6% which is ok for me. Case 1 is as you described. Case 2 is also as you described. The rest of gas is, as you said, 318 std m3. Case 3. Sorry, I should have mentioned that there are two...
  7. CostasV

    Compressor vent gas injected to lower pressure network

    A first cost estimation is 350 k euro. One significant cost is the 3.5 km (between compressor station and distribution network) pipeline of 4". I am not sure what you mean as restart gas. ESD, correct, will always go to vent. The requirement "must drop to 7 bar in 15 minutes" is the design...
  8. CostasV

    Compressor vent gas injected to lower pressure network

    Hi, thanks for your replies. LittleInch, correct, only 2/3 of gas is "saved". The rest 1/3 may be blown-down. The time needed to inject the gas into the city distribution network is not 15 minutes, it is 1 hour. So the flow rate is closely to 1000 Nm3/h. If the compressor needs to be blown...
  9. CostasV

    Compressor vent gas injected to lower pressure network

    Hi, We have a compressor station where the process vent gas is 1000 normal m3 for each stop. This gas quantity is now released into the atmosphere. The total number of venting actions is about 20-60 per year. If we inject this quantity into a lower pressure network (city distribution network)...
  10. CostasV

    Discrepancy in the pressure

    Thanks for all the replies. My guess is that instead of 264 psi it should be 1264, and instead of 285 psi it should be 1285. I did have the opportunity to look in the valve documentation, but I let you know if I find the answer.
  11. CostasV

    Discrepancy in the pressure

    Hi all, Could someone explain the discrepancy in the pressure, in the tag of photo? Is it possible to have a #600 valve, and the MOP to be 264 psi at 80 degC and 285 psi at -24 degC? https://res.cloudinary.com/engineering-com/image/upload/v1617037124/tips/valve_tag_pveaye.pdf...
  12. CostasV

    Pemex Reynosa September 2012 explosion

    Hi all, During a safety seminar the safety engineer presented the video of Pemex Reynosa September 2012 explosion. But without any further information. As I understand, in 0:32, the above ground pipe (or maybe a valve or metering unit ? ) is totally ruptured and then the pipe rotates, almost...
  13. CostasV

    Gas filter differential pressure

    Asking the vendor to test/examine it, is a good idea, thanks.
  14. CostasV

    Gas filter differential pressure

    LittleInch I don't have a design but here are 2 photos.
  15. CostasV

    Gas filter differential pressure

    Hi EngineerTex Thanks for your answer. No , I have not found any explanation to the problem yet. 1. Yes 2. The only path is the 20mm thickness steel plate that separates the "dirty" gas area from the "clean" gas area. Even if there was a leak by passing the filters, this leak would still had...
  16. CostasV

    Gas filter differential pressure

    Collapse dp is 2,2 bar according the data sheet. Based on this collapse pressure we set the max allowable dp at 500 mbar, (the 500 mbar dp switch did not activated). The data sheet has no information about max momentary pressure. Pressure relief devices are much higher, over 80 bar, while the...
  17. CostasV

    Gas filter differential pressure

    We had a natural gas filter differential pressure reading that we can not explain. Maybe someone could help. The equipment is a filter OD 1320mm horizontal pressure vessel, design pressure 80 bar. It contains 37 cartridges D192mm X d90mm X 878mm. Design flow 500.000 Nm3/h at line pressure 40...
  18. CostasV

    Pylos combat agate - Miniature drawing

    I was thinking of a lever based machine that could scale down a larger drawing, like a pantograph. Pantographs, invented in 17th century, are widely used to make miniature engravings. So, perhaps pantograph technology was invented 35 centuries earlier? Any other low technology (except hanging a...
  19. CostasV

    Pylos combat agate - Miniature drawing

    Without magnifying glass, what other way is there to scribe this drawing on a 36 mm sealstone?
  20. CostasV

    Battery poles connencting strip repair

    Thanks for the idea, itsmoked.

Part and Inventory Search

Back
Top