From a pump user's standpoint, which is preferred and why? Most chemical (read: ANSI, ISO) pumps are of centerline discharge design (the discharge flange center is in the same vertical plane as the pump's centerline). The theory, or at I've been told, is that it allows for:
(1) self-venting or...
Not every time, but consistently, I get a message from Outlook when I start SolidWorks 2004 SP1. The message indicates that a program is trying to access my e-mail list. It doesn't happen with any other program. Anybody else seeing this?
Can you get SolidWorks to display dimensions of all sketches while in the feature view? I've looked, but can't find an option to do that. As soon as you edit a sketch, the dimensions of that sketch can be viewed, but I'd like to see the dimensions of all my sketches at the same time. I...
Alright, I hope this is as much fun as 2/4 pole.
For general and chemical service:
Personally, I'm a fan of enclosed impellers and keyed to shaft drive. However, the majority of the pumps mfgs seem to prefer semi-open, threaded against rotation types.
I can appreciate the 5x wearing surface...
Do you remember the commercial where the owl tries to figure out how long it takes to get to the core of a lollipop? Well, how many identical guides does it take for SW to follow in a lofting feature?
Those that saw my post on variable fillet can see the shape I'm trying to make. I keep...
Hey, I'm semi-new at SW, but have done enough to know most of the basics. I want to apply a variable fillet to a curved (poly-arc) edge, but I don't want to have the fillet begin at zero radius. If you apply a radius on a given segment, the software program forces the fillet to continue, on...
3 years ago, I evaluated Inventor, Pro/E and SolidEdge. Although I made the choice to go with Inventor partially because of my familiarity with AutoCAD - that has since proven to be a fateful mistake. The other programs import/export and handle dwg files BETTER than Inventor. I did like SE...
Back when I was handling contract orders for IDP, a lot of the specifications called out for 1800 rpm (4 pole) maximum speed. Inevitably, sales and purchasing always worked around that spec. for the sake of savings, but I was wondering if that has changed at all. Although the pump size would...
I'm a pump guy, so "Centrifugal and Axial Flow Pumps" by Stepanoff is my "pump designer's bible". Is there an equivalent for electric motor design?
I've heard that for AC motors, P=(d^2)*L, where P is power, d is diameter of laminate stack and L is the stack length. True? If so, d is ID of stator, right? And P is watts?
OK, I know I can overspeed a motor using a VFD, it just changes the nature of the torque (constant/variable). However, I want to take a 400HZ motor (0.5HP, 22,800 rpm, 5.5A 3Phase) and spin it at 60HZ. No problem as stated, but I want to get the HP out of it at 60HZ ideally. What would happen...
Is there any special considerations to take into account for using a small transformer to step-up 208 3 phase to 230 3 phase in a very humid environment...as in 95% or so relative humidity? It would either be an 18 kVA for powering a group of pumps or 75 kVA for powering all of the pumps (21...
I'm looking to develop an axial flow pump (not fan) and much of the available information is based on fans (and airfoils). I'm hoping that I can follow the fan principles for pump design too (liquid -vs- gas).
I do have one specific van question: should vane width at the tip be shorter than...
I'm looking to develop an axial flow pump impeller and there seems to be much more data available for fans (and airfoils relative to air) than axial flow pumps. Other than compressibility, they should be very similar, right?
Can anyone point me in the direction of helpful sleeve bearing design guides for the poorest of all lubricators: water? Every damn bearing guide assumes that you're going to use grease of some variety, and with most chemical applications that isn't going to work?
In sealing two parts, say 8" in diameter and smaller, what are the pros and cons of o-rings versus the same for gaskets? I think for chemical compatibility, o-rings would have to win hands down thanks to the variety of materials all the way up to the perfluoro's (Kalrez). I've never seen...
Has anyone used or designed impellers above the classic limit of 18,000 ns? We've got an application that would require well above this limit (if at b.e.p. and 2 pumps). I realize I could fall into the norm and stick to the books, but I can't help wondering, what's a 40k impeller/propeller...
Does anyone know where to find some information regarding a really compact planetary gearset? I need to reduce the speed by 6.6 factor. The shaft is 0.322" with two flats and the ring gear will be molded in with my part (approx. 1.25" ID). I know it sounds extreme, but you never know...
I've got a potential design that requires a motor to have a "hollow" rotor design. I've seen rotors that have "spoked" lams that lead me to believe that the inner area is not necessary from an efficiency of the motor standpoint. I'd like to find an existing design that has...
