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  • Users: ARenko
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  1. 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...
  2. 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...
  3. 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...
  4. ARenko

    Threaded pipe min wall thickness

    API 570 defines required thickness as the lesser of pressure design thickness or structural design thickness. Pressure design thickness is defined as "minimum thickness without corrosion allowance based on design code calculations for pressure." Let's say pressure design governs our threaded...
  5. ARenko

    Using B31.3 Chapter IX for low pressure pipe

    We have a company standard that requires the use of B31.3 for wall thickness design. Some pipe manufactured before this standard does not meet the design criteria of Chapter 2 - it's 3000 psi pipe made from L80 tubing (API 5CT). It is a significant amount that management does not want to take...
  6. ARenko

    choked flow and positive displacment pump

    We are testing a positive displacement pump with water, applying pressure with a control valve. Pressure drop is very high - P1=1500 psig, P2=10 psig. By calculation of choked flow conditions, the max allowable pressure drop is around 1100 psi. Max flow is calcluated around 250 gpm. Actual...
  7. ARenko

    breaker sizing

    We have an electric motor driven pump controlled by a VFD. The pump's HP rating is about twice what the process requires. So, while we might normally install this pump on a 600 amp breaker, we don't expect to ever draw near that amount. The installation location cannot supply the 600 amp...
  8. ARenko

    pressure drop in cross/ tee

    I have cross that is blanked one end so there it is essentially a tee. Flow comes into the tee from the branch and either 1) all flow goes to one side (now it's an elbow) or 2) flow diverges to each side of the tee run. I'm trying to figure out how to calculate pressure drop for these two...
  9. ARenko

    specifying mill tolerance

    I've read a few posts in this forum that in the manufacturing of seamless pipe that one side of the pipe will be thin, while the opposite side will be thick (w/ respect to nominal wt). I understand that this thickness variation will happen, but is it true with respect to nominal? That implies...
  10. ARenko

    deflagration venting vs pressure containment (NFPA 68, 69)

    I posted this in the NFPA forum, but then found this forum and thought it may be more appropriate... I have a vessel that will be operating at typically 1-2 psig - it is connected to a flare line. The vessel will occasionally handle air and natural gas and will experience mixtures in the...
  11. ARenko

    NFPA 69 vs NFPA 68

    I have a vessel that will be operating at typically 1-2 psig - it is connected to a flare line. The vessel will occasionally handle air and natural gas and will experience mixtures in the explosible range. We intended that the vessel will operate at maximum 5 psi by using a relief device. In...
  12. ARenko

    NFPA 69 & LOC

    I'm confused by Section 7.2.3 in NFPA 69. Do the values in Table C1 not come from ASTM E2079 testing? Is the adjusted value to be used when there is no ASTM testing at test conditions or no ASTM testing at intended operating conditions? I'm not familiar with the ASTM spec.
  13. ARenko

    metric cables

    I've seen a number of metric cable constructions listed as 4x16/16, 4x50/25, or similar. I understand 4 is the number of cores and one of the two numbers represents mm^2, but which one, and what is the third number? I assume this identification comes from an industry standard - which one?
  14. ARenko

    ATEX Power Connectors

    Does anyone know any manufacturers that make 480V/ 125A ATEX rated connectors for Zone 2 (Cat 3G)? I have a piece of mobile equipment that we'd like to have a male plug at the unit and female end connector on the cable coming from the generator.
  15. ARenko

    extension cord with male plug on equipment end

    I'm not sure if this is the right forum for this, but here goes. I have a piece of oilfield equipment which runs on 480V supply. This equipment has a 125 amp socket w/ disconnect swtich (Stahl 8581/11-407). Normally this receptacle would be the source of power from which we plug our...
  16. ARenko

    Cooler specs f/ offshore

    Can anyone advise typical specs for radiators and coolers in offshore environments. We typically have three types of coolers on our equipment - engine radiators, Alum bar & plate heat exchangers, finned tube heat exchangers. These are on mobile equipment, so they will often come back to shore...
  17. ARenko

    API 16C Control system gauges

    In API 16C section 10.9.1 it states that drill pipe and casing pressure gauges must be scaled from 0 psi to full rated working pressure of the choke. It also says bourdon tube gauges are required, but can be supplemented with other types of gauges. It goes on to say gauges of any type may be...
  18. ARenko

    penetration in Nema 7 enclosure

    We have a Nema 7x enclosure that will house an electropneumatic proportional valve. The valve runs on 24 vdc, consumes about .3 amps, and receives and sends a 4-20 mA signal. What requirements are there for passing through hose or using bulkhead fittings through the walls to bring in/ out the...
  19. ARenko

    european salaries

    Anyone know a website with engineering salaries in Europe? Something like salary.com? I can't seem to find anything. I've got an offer in Paris, which is low per my manager friend at the company (and per me for that matter) and I need some backup, without using him. Or, any Europeans or...
  20. ARenko

    sprocket dwgs

    Anyone have, or know where to get, 2D cad drawings of standard sprockets? Specifically I am looking for ANSI No. 35, 10 tooth sprocket. TIA, djv

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