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  • Users: jor1492
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  1. jor1492

    ECR vs ELR

    Hi, This is a little out of My area, but I have the question what are the difference between an earth continuity relay vs an earth leakage relay? At the end both of them look for an earth fault ? And in what application one is better than the other ? Thanks in advance
  2. jor1492

    dead head associted with low current?

    Good day everyone, Yesterday I was a issue with one pump operated by motor, where it wasnt deliver enougth flow rate and it was running with low current. at the end I discovered that the problem was a dead head operation So my question is, a symptom of a pump working in dead head is low...
  3. jor1492

    Static Head in Circuit

    What is the static head in a system were discharge vessel is not at the highest point in the circuit? Highest point in the circuit is at 11 m from pump discharge. Discharge vessel is at 0 m from pump discharge...
  4. jor1492

    Weld a support plate over the horizontal and vertical welding lines a tank.

    Hello all, I want to know if it is common to weld support pads on the tank shell , if the welding lines are over the welding lines of the tank. if it is not possible what is the reason? see attached picture...
  5. jor1492

    problem with installation of shell plates

    Hello all, I am working in the erection of the 4 courses of a API tank. In the second course I found that one shell plate is shorter as per design drawings. this generates a bigger gap for the welding ( 2mm in the bottom of the plate and 12mm in the top) see attached sketch. What could be a...
  6. jor1492

    some masters or post graduate degrees to be more successful in the EPC projects

    Hi all, I am a mechanical engineer trying to improve in my career. I want to know what kind of engineering master you could recommend me if I want to specialize in the EPIC projects. thanks in advance
  7. jor1492

    Hydrant, dry barrel modification

    Hello all, I am installing hydrants of dry barrel, but these was bad specified about the barrell length. So to suit we are thinking in modify the barrel (cut to be shorter) and valve stem. From a construction point of view is very easy the modification. But now I am thinking that maybe there is...
  8. jor1492

    specifying J anchorage bars grade 8.8

    Hi all, I want to sent to fabricate J anchorage bars for a tower crane foundation. As per the vendor of the crane the anchorage bars need to be grade 8.8, so my question is: to specify the material for the manufacture, it is enough information for the manufacturer, only specifing him " Carbon...
  9. jor1492

    Avoiding deflection in a rail when the bridge is already installed with a permissible deflection

    Hi all, Currently I have a Gantry (Bridge) already installed with a permissible deflections by the settlement of the structure . Above this structure I will install a shuttle conveyor, Therefore the rail of this machine will present unacceptable deflections that I will require to correct, in...
  10. jor1492

    Diesel pump place without sprinklers

    Hi all. I am aware about the rule, that if I have a diesel pump, I will need to install sprinklers above the storage fuel area as per NFPA 20. This is a common practice. But in the particular project that I am working ( A copper process plant in a copper mine) we have the fire pumps at outdoor...
  11. jor1492

    Re use pipe materials from new pre manufactured spool.

    Hi all, Normally We pre manufactured all our rubber lined spools with a supplier, but now is necessary the modification of one in field. Here we have all the tools and good personal to work in that. In this special case, I am requiring to trim a 1 meter nipple from one spool and this same...
  12. jor1492

    air conditioner unit branch circuit rules

    Hi all, For the design of a temporary camp, small rooms, it has been decided to power each room with a single circuit - 2 pole breaker for an 1100VA Air conditioner split (240V, 2 hot wires 120V each) and from there, one hot 120V phase will continue to power 3 outlets for small appliances and 2...
  13. jor1492

    heat treatment after bending pipes

    HEllo all, I want to know if you recommend to use some kind of heat treatment after the process of bending a pipe. For the bending I am using heat to put more ductile the material. The material is Carbon Steel (api 5l). thanks in advance.
  14. jor1492

    240V 1ph 2 hots wires VS 240V 1 hot wire-N

    Its known that 240V can be obtain typically (US) as 1ph, 2 hot wires (120v each) commonly used for domestic A/C units, for example. I have now seen a few equipments from different countries where 240V is obtained by having a 480 primary / secondary 415-240V 3phase transformer and connecting 1...
  15. jor1492

    Necessity of cathodic protection for an overland Pipeline of Diesel

    Hello All, In your experience do you recommend a system of cathodic protection (impressed or galvanized) for a Carbon steel Pipeline of Diesel running above the ground (not buried)? For information the life of the plant will be 50 years.
  16. jor1492

    Impressed current cathodic protection in tanks already constructed

    I am in a project where I am seeing tanks already constructed but without cathodic protection system. Is there a form of implement this system or something that give the cathodic protection to this tanks?
  17. jor1492

    passivation and pickling in SS storage tanks?

    Hi guys, I have two questions about the surface treatment in a SS tank 1)For the construction of a SS storage tank, is necessary passivation and pickling? or only passivation could be enough for the construction? 2)What is the difference between the ASTM A 380 and A 967? I have to use one of...
  18. jor1492

    min distance from the edge of a pedestal to the edge of the base plate.

    Hello all, My issue is: I have several square base plates bigger than the concrete pedestals. the base plates are for columns and these will be over the concrete pedestal (typical column with pedestal arrangement), so I have to cut the base plates to be smaller than the concrete pedestal. My...
  19. jor1492

    Nameplate relocation in a vessel?

    Hello all, I install a vessel, where the nameplate location is no visible. there is an obligation in the codes about put the nameplate in a visible part? How Can i achieve this without cut the existing nameplate?
  20. jor1492

    method to determine the fillet weld size

    Hello all, There is a guide, table or method to determine the fillet weld size in a structure subjected to cyclic stresses? Frequently for static structure I use the table for min and max size of the AISC. Is this a good method to determine this size? thanks in advance.

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