ASI discrepancy Aspen vs. steam backup

[DonMuncy]

2 hours ago, Bob_Belville said:

Don, I understand re excess pressure. So you move the metal scale, with the magnets holding it in position, to set zero on the lower fluid level and read the delta. Easy enough.

My BP arm band bleeds air, as it has to, and does not hold a pressure. I guess I don't know where the bleed air escapes I don't think it is at the bulb or the relief valve.   

The bulbs are designed to be able to hold in your hand and turn the valve without shifting your grip. They are too cheap to worry much about. Just get another one.

[Marauder]

Don, I understand re excess pressure. So you move the metal scale, with the magnets holding it in position, to set zero on the lower fluid level and read the delta. Easy enough.
My BP arm band bleeds air, as it has to, and does not hold a pressure. I guess I don't know where the bleed air escapes I don't think it is at the bulb or the relief valve.   

Jeepers Bob! Doesn’t everyone have a spare blood pressure cuff bulb?






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[EricJ]

Some ways to cheat on the manometer:

https://www.amazon.com/dp/B07F6662W4/ref=sspa_dk_detail_4   - dial gauge with "H20 and oz/sq in scales.

https://www.amazon.com/Kodiak-Controls-KC25-30-H2O-Pressure/dp/B00H9ZWGCY - just "H20 for a little less $.

https://www.amazon.com/Manometer-RISEPRO-Digital-Pressure-Differential/dp/B01680C4C2   - electronic manometer.

 

[Bob_Belville]

On 11/20/2019 at 5:47 PM, M20Doc said:

Here’s another chart for water to ASI.  And a way to make a chart.

http://www.iflyez.com/Manometer.pdf

@M20Doc... Those two tables are (slightly) different. Perhaps the second column in Table 1 is rounded off. 70 mph is actually 60.87 k which might be the reason the top chart has 60 k = 2.35" and the bottom has 2.47".

we're going to scribe a 3' scale for use with tubing loop and bp bulb per @DonMuncy's. We'll use the data above to scribe the scale from 50 k to 220 k. From the c/l of the scale each "speed" will be marked by lines 1/2 the inches of water about and below the c/l. E.g. a pair of lines, one 4.74" above and one 4.74" below the c/l will be labeled 120 k. 

To use we'll adjust fluid so that the columns line up with the c/l. As pressure is applied the speed can be read directly as the fluid levels move up on one side and down on the other.   

I am no doubt reinventing the wheel... whatcha think?

(My browser won't open the link...)