3D & Ed,
Testing was completed as described resulting in no appreciable difference in neodymium/plastic epoxy bond strength at north or south poles.
All that is coincidental may not be causal.
Thoughts from a Chemist;
I'm a bit confused by 3DDave's comment about silicon oil contamination...why would neodymium magnets have silicon oil only on one side? Why would silicon oil be there at all? I thought these magnets were just small, flat cylinders of a neodymium alloy. If these are...
3D and Ed,
You've convinced me to experiment. Please suggest any steps I have missed below.
1) purchase 10 neodymium magnets
2) clean both surfaces thoroughly with duct tape then acetone
3) line up magnets in a row on clean sheets of paper, facing 5 north and 5 south up,
4) mix J-B KWIKWELD...
3DDave,
The silicon contaminant would have been spread over both sides of the 16 magnets. They were handled excessively with bare fingers befoe being assigned to the current project. More 'controlled' testing is in order.
prex and Ed,
Would'nt steel reinforced resin be a good idea if it...
Ed,
By "filler" do you mean "resin", which is the component affected by magnetic flux?
Why would polarity affect this movement when the resin appeared to be attracted to both poles?
I made an intriguing discovery while epoxying plastic knobs to neodymium magnets.
I didn't pay attention to polarity when epoxying them but discovered that, thankfully, all but 3 out of 16 were configured so that they repelled each other.
This was fortuitous because they are prone to spalling...
Gerhardl,
Examination of another failure of the same type of valve revealed that the manganese bronze had been severely fretted by the cast iron gate causing separation.
This valve and the previous failed one were both located downstream and very close to a V-Ball Control Valve resulting in...
Latexman
I heard back from the manufacturer who advised that the product will only foam a minor amount due to the stabilization package keeping the polymer dispersed. However, if 0.5 - 1.0% ammonium lauryl sulfate (ALS) or sodium lauryl sulfate (SLS) type froth aids are added, the foaming...
I suppose only experimenting with aerating different concentrations of this emulsion can determine whether aeration can create a temporary density less than water. I was hoping someone in industry knows whether this has a chance of working. The literature on slurry operation advises an LDV of...
Thanks gerhardl,
This is an isolation valve in a Service Water System (fresh water at 98 psig and 33-73 degF), with silt possibly preventing the gate from seating, so 'extra' torque may have been used.
I found this advice online:
"The T-head/T-slot designs have a T-head on the end of the stem...
thread135-433434
At our plant we use a leak sealing agent comprising carbon fibers (.007 x .1) mm dia/length in DUR-O-SET A-802 emulsion for sealing minor leaks from pinholes (2 mm dia) in pipe. My question is: would aeration while diluting in water reduce the LDV (Lowest Deposition Velocity)...
thread408-405652
The damaged valve was disposed of before inspectors could characterize the failure mode.
Turning the handle raised the stem but UT indicated the gate did not move.
To fail the stem in torsion and compression, calculations indicate very low yoke sleeve/nut friction and very large...
A leaking control valve stem packing requires on-line sealant injection through the existing leak-off port at the lantern ring.
I calculated the maximum stuffing box pressure using thick shell formulae and area replacement methodology (for the injection hole) and got approx. 10,000 psig based on...
For the love of Pete!
Is there anyone who will comment on the propensity for a size-on-size branch connection to cause flow transients from condensate entrainment and vortex shedding?
Lets leave the bloody operators out of this !
I think the following might happen:
1) The leaky blow-off valve fills the branch with cool condensate
2) Initial blow-off is 100% saturated liquid due to the slave/master opening sequence 3"nps slaves on each boiler, 4"nps master on a group of boilers
3) As hotter blow-off enters the master...
Duwe6,
Please explain your advice...how could a 4"nps bucket of water downstream of the blow-off line look 'very good' to you? Is this advice supported by analysis or experience?
Here is a sketch of the proposed drain connection.http://files.engineering.com/getfile.aspx?folder=0923dd38-3a11-47cd-ac88-a0329fa3edb0&file=Blow-off_Drain_Proposal.doc
