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Recent content by ARenko

  1. ARenko

    Resistance coefficient of tee with capped end

    LittleInch, "Well it seemed you were creating a problem where one shouldn't exist." It is not really a problem, I just wanted to make sure my calculations were accurate. And we have convinced some customers to go with lower pressure ratings, but if they want to pay for higher pressure ratings...
  2. ARenko

    Resistance coefficient of tee with capped end

    It's not uncommon in this type of equipment to orient the choke with flow coming in from bottom. These are drilling chokes that are much more robust than typical production chokes - they process drilling mud with cuttings and sometimes small amounts of gas. Cavitation is unavoidable due to the...
  3. ARenko

    Resistance coefficient of tee with capped end

    I agree, 5000 psi rating is not needed downstream of the choke. Heck, our system really doesn't need to be 5K in the first place, as upstream pressure limitation is 2K, but this is the way it is. The application is a choke manifold in managed pressure drilling. I've suggested we have a spec...
  4. ARenko

    Resistance coefficient of tee with capped end

    LittleInch, The tee turns the flow back in the direction it came from. Flow comes into the choke from below, turns 90 deg right (choke is 90 deg valve), then the tee turns the flow 90 deg down. There is pipe in between, but it's distance is set by a gate valve on a bypass line. For two pipe...
  5. ARenko

    Resistance coefficient of tee with capped end

    We have a "tee" (it's an API 6A block - see ling below) that we use as an elbow, by putting a flange on one outlet of the tee. Modeling this as a 90 degree miter bend results in significant reduction in the capacity of our control valve and I'm wondering if it's really appropriate to model it...
  6. ARenko

    50/ 60 Hz motor question

    Yes, I get the math. It was the nameplate (like in the example I linked) making no sense to me that made me ask my original question. To me that nameplate is wrong. I just wondered if there was something else I was unaware of. Thanks again for your help.
  7. ARenko

    50/ 60 Hz motor question

    Looks like I forgot to put the link, so not sure what you're looking at. Here's the link... http://www.mgmelectricalsurplus.com/Details/Motors/AC%20Induction%20-%20Squirrel%20Cage/219.php What I've seen on other motors is it might say 20 HP under the 60Hz section, but under the 50Hz section...
  8. ARenko

    50/ 60 Hz motor question

    Thanks Bill. Here's an example of a nameplate that suggests (to me at least) it's 20 HP at both 50/60 Hz. That just threw me for a loop as I've always thought of it the way you guys explained it. It's a hydraulic motor - I've sized it and the motor to accomodate the lower speed and HP at 50...
  9. ARenko

    50/ 60 Hz motor question

    Thanks waross and jraef. I plan to base speed on 50Hz because it affects my flow rate. jraef, when you say the HP is more than you need, this is what confuses me. I mean, that's the way I've understood it when moving equipment between US and Europe for example, but when I see motor...
  10. ARenko

    50/ 60 Hz motor question

    Thanks jraef. Let me say this motor will not be on a VFD, just a starter, or maybe a soft starter. This is a hydraulic pump application, which I usually size the motor by HP to meet my pressure/ flow demands. If the torque stays the same and speed changes, then the HP will change and my flow/...
  11. ARenko

    50/ 60 Hz motor question

    I know there are a lot of questions related to operating on different frequencies, but I haven't seen anything that answers my questions. I understand how operating on different frequencies than rated affects a motor's speed, power, etc..., but I'm wondering about motors that are dual rated for...
  12. ARenko

    Air flow required by a nitrogen generator

    Assuming you need 151 SCFM at 145 psig, and that you need 175 psig at the membrane inlet to get 145 psig out (is this from the manufacturer?)... Your pressure correction is 2.1, so nominal unit requirement is 151/ 2.1 = 72 SCFM. The main plus three sub units will handle this (delivering 2.1*80...
  13. ARenko

    Fastener material/ coating for application with KCL

    It's onshore and under the rig floor of a drilling rig, where occasionally some KCL mud can rain down on it. And like TugboatEng said, it's low stress - the cover weighs about 30 lbs - it's just to protect a part of the equipment during transport/ handling/ installation.
  14. ARenko

    Fastener material/ coating for application with KCL

    Thanks for the replies. I'll go with the Armorcoat so we don't have to worry about galling.
  15. ARenko

    Fastener material/ coating for application with KCL

    We have some equipment installed under the rig floor on a drilling rig where KCL mud is used. We are adding a carbon steel cover to add some protection from impact and this cover will have to be periodically removed for servicing the equipment. There's concern that corrosion of the fasteners...
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