I am going to build and submerge test hardware in a swimming pool. What type of stainless and what type of coating for alumium is recommended for long-term submersion?
Should sacrificial anodes be considered?
I'm a test engineer and am seeking advice on how effectively an infant could shake a crib to failure. Shaking loosens hardware like screws (over time) while impact can cause outright failure. It is known (and quite intuitive) that infants don't have alot of strength. Still, hardware loosens on...
I am testing products in a swimming pool-type test facility in which self-priming pool pumps pull water from a bottom drain and discharge to a submerged level in an open tank. There are no other sources/discharges. The test is to suddenly block the bottom drain. The tested products are designed...
I test swimming pool drains-- sort of. I block the drain with a foam pad after establishing constant flow gpm. I take data and the pressure/time trace shows an initial sharp drop and then an oscillatory form on top of a decay back towards the pressure of the water head of the tank. Longer...
I test swimming pool drains-- sort of. I block the drain with a foam pad after establishing constant flow gpm. I take data and the pressure/time trace shows an initial sharp drop and then an oscillatory form on top of a decay back towards the pressure of the water head of the tank. Longer...
I am looking to estimate the vibration frequency of an unforced spring-mass-damper system. Does anyone know a source for spring constants and damping factors for foam rubber? Preferrable EVA foams?
I am running tests that measure the pressure response beneath a pool drain after the drain is blocked suddenly and then the pump is turned off 1/2 to 1 second later. I am finding that a limit is reached in the effect of increasing pump size and flow rate on the time (dT) for pressure to...
When was the last time a Hurricane hit Washington, D.C? That is, the sustained winds were still at Hurricane force in the metro area of Washington. What was the name?
I have a PacFab Challenger CHII-NI-3FE high head pool pump that has a "impellar screw that prevents reverse spinning of impellar in back-flow applications". I'm running tests that require the drain to be blocked with a pad and the pump to be turned off-- the pad should then be freed. Curious...
Does anyone know how to find who won awards at the SPO in 1905? That has to go down as some of the most dispiriting awards ever given.
In the year that Albert Einstein published his seminal work, he worked at the Swiss Patent Office. There with him were some bright people, searching patents...
Anyone have a source for design info for reinforcment of concrete piers with horizontal soil loads? I'm building a cantilever retaining wall and want to use concrete rather than wood posts sunk into the hill.
Anyone know of a source for these or where they might be described? I'm seeking a continously revolving motor that is powered by the temp. difference between ice water and room ambient. The torque can be quite meager, say 0.5 oz-in.
My problem is to calculate the final velocity of a small mass, m, tied to the end of an elastic band that is pulled and released. I know how to do this in the simple case: potential energy of the elastic (spring)equals kinetic energy of the mass. The challenge is that the mass of the elastic...
I am building a roof over a deck to screen-in. Due to the form of the deck, supports are to be 19'6" apart and a beam is required for that span. The beam will carry a distributed load and a point load from two different roofs. [Point load is from the support of another beam] At 30psf load...
We have a pneumatic testing station for cyclic tests on consumer goods of various ilk. Positioning and alignment has been a cumbersom task. I'd like to attach the air cylinder at each end to struts. The front would have two struts, the rear three struts. Problem is: three ball joints can't...
