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Changing Oil Pressure Gauge

Kinda whatever you want to do. On my kitchen water pressure gauge you want air in that water line to the gauge. From the basement to the gauge is a good 14 feet. Water will not measure true pressure as compared to an air column. On a tractor I would think the air would read faster????? I do know that for the longest time race cars preferred mechanical to electric gauges. If you look at the back of the fitting on your gauge there should be a VERY tiny hole going into the gauge. If it is so, that hole makes it so the gauge is not shocked by the input. I would let the air stay in the line myself.
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liquids are non compressible, so the gauge will change instantly, air is compressible but will catch up, thus delaying response,

I never worry to bleed.
 
Yes, but what I was thinking that really cold oil in a very tiny capillary tube takes a few seconds. That is why I like air. The line on my water pressure gauge from the pump head that column of water actually alters the readings.
 
Yes the dinky 40-60 psi pump on a 60 year old tractor, sure but I deal with all kinds of stuff. We just changed out a heater water booster three days ago and you ALWAYS just crack the water line valve. Water going into an air filled booster till it is purged. You can really get hammer in water systems. The hydraulics on some of the large cooking systems they blew a hose awhile back. Solenoid slammed shut at full speed and just couldn't take it. Also another thing about gauges. You should have a gauge with the scale about 2/3 of your desired pressure. In the boiler rooms of heat plants, ships, steam locomotives, they are always somewhere in the mid range. Also many of those gauges have restricted flow so the gauge doesn't get damaged. That is why both of my gasoline powered portable air compressor units have oil filled gauges on them. Plain gauges just get shaken apart. I just over build stuff a little. Not a big deal but when I make modifications I just do it.
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Pump station in Colorado (south end of Horsetooth reservoir) had 2-14 inch pipes running raw sewage up a 175 foot ridge. A flange gasket on one of the pumps was leaking about a gallon a minute. An alarm went off, and the first person on the scene was a supervisor type. With no consultation at all he decided the pumps needed to be shut down. Instead of valving the flow, and reducing the motor speed with the controller, he pulled the lever on the supply circuits. The sewage continued up the hill for about 100 feet. then came back down against the foot valves at the pump output fittings (where the leak was) both lines flange joints failed as the "hammer" came down. and pushed the flanges about 6 inches apart. The building was filled in about 30 seconds. He survived, but was blown out the closed door. pretty nasty over pressure. Jim
 
I am west down US 12 from you, just east of Quincy, Michigan. John Sanderson, you say? I am descended from a John Sanderson, but it's back a ways. He was a veteran of the war of 1812. His grandfather, Benjamin Sanderson, fought in the Revolution. I'll say my ancestry off the top of my head; see if any sound familiar: I am Joel, son of Marion, son of Leo, son of Marion, son of George, son of Joel, son of James, son of John, son of Johnathan, son of Benjamin. Any patterns in your family? (Gosh, I hope I have all that right; I mix them up past James some times.) My brother and I are the last of this line of Sandersons though.
 
Jim I really had to laugh at this one. I could just picture that magnificent mess in my mind. People hear a tiny hammer on their home system and it is with 40-60 pounds of pressure. Try taking a balpeen hammer to some of your water system parts. Better yet. 500- 700 psi in a naval engine room. Heck..look what that little pistol shrimp can do. That is why I have air in the line going to my kitchen gauge. That roughly 12 feet can drop the reading by several pounds because of gravity pulling on that column of water. I want the true pressure down at the pump going into the tank. Tried it many years ago. Screw a garden hose onto the bottom of your water heater and screw on a good gauge at the other end. Leave air in the hose. Now walk up you cellar steps and then climb up a 10 foot step ladder. You would never beleave how much that gauge drops. Then try it with water in the hose. Big surprise. Here is the shrimp.
Pistol shrimp.
 
(quoted from post at 18:20:28 02/01/20) Jim I really had to laugh at this one. I could just picture that magnificent mess in my mind. People hear a tiny hammer on their home system and it is with 40-60 pounds of pressure. Try taking a balpeen hammer to some of your water system parts. Better yet. 500- 700 psi in a naval engine room. Heck..look what that little pistol shrimp can do. That is why I have air in the line going to my kitchen gauge. That roughly 12 feet can drop the reading by several pounds because of gravity pulling on that column of water. I want the true pressure down at the pump going into the tank. Tried it many years ago. Screw a garden hose onto the bottom of your water heater and screw on a good gauge at the other end. Leave air in the hose. Now walk up you cellar steps and then climb up a 10 foot step ladder. You would never beleave how much that gauge drops. Then try it with water in the hose. Big surprise. Here is the shrimp.
Pistol shrimp.
Click to expand...

Its .433 psi per foot at the bottom of the column static
 
In the attached article please find the description of Glen Canyon dam near failure.
Here are the details. Glen Canyon dam was constructed using 4 bag concrete, against the engineering recommendation of 5 bag. As the flood described in the document was happening, the flow rate was actually filling the spillway passages. The design never accounted for a situation like that. The bottom of the spillways (inside the dam) were curved where they bent at the bottom where they turned to exit the bottom of the dam about 40 feet above the base river level. As the vertical (unlined) filled ever higher as the flow increased, the portion of the passage at the corner began to cavitate. the engineers felt the structure begin to shake. They were so concerned that they applied the Band-aid fixes discussed. The text is accurate. I was privileged to be in a conference with the engineers (after the event was over) at Northern Arizona University. A real close call. Jim
The story basics.
 
A similar thing happened when I was working for Reserve mining at Silver Bay MN. One of the tailings pipeline pumps kicked out, and a dump valve failed to open, The slurry came back down the pipeline so fast it screwed the impeller off the pump, pushed the shaft out of its housing, and pushed the armature out of the 900 hp electric motor!
 
A lot of times industrial gauges have a loop of tubing below them, to prevent the liquid from getting to the gauge, or in the case of steam, the heat. There is no reason to bleed the air out of a gauge line.
 
Hi Joel
You have a better grasp of your family tree. My great, great grandfather, John, is buried south of Hillsdale in a plot of his wife's family. Born circa 1796, died 1862. His one son (may have been others), Frederick, had 2 sons. Albert and William, I believe. They lived just sw of Mount Pleasant. Albert is my grandfather and he had 6 children, my father, James was the youngest.
My parents moved from the family farm south of Winn to Ypsilanti in 1942. I was born in 1943. I have 3 sisters, no brothers.
My wife and I have 2 sons and a daughter. Our oldest son (has 2 sons) lives near Manchester, our daughter is in DC (no children) and our youngest son (has 2 daughters) lives in Milan.
Is it possible John, buried near Hillsdale, is a common ancestor?
I have a cousin in Seattle who did a lot of research of the family. I share some of the names that you list and see if she has anything.
John
John
 
Years ago I had a vehicle that I had put an oil pressure gauge in using 1/4" tubing to connect it up and over the years I had to drain the oil back out of the tube a couple of times to prevent the gauge from pulseing. It needed an air "spring" to dampen the oil pump pulses. Air will not hurt a thing if you have it in t he line and may help prolong the life of the gauge.
 
Difference in pressure reading is completely negligible. Perfect gas law approximately applies to air, so PV is a constant. If the gage increases in pressure reading from atmospheric [14.7 psia] up to 70 psig [84.7 psia], or a factor of 84.7 / 14.7 = about 6, then if the height of oil in the gage is 3 feet up, the reading will reduce by 3 feet oil pressure divided by 6, meaning a pressure reading reduction of 3 feet x ~ 0.4 psi/foot / 6 = pressure reduction of about 0.2 psi reduced reading. Completely negligible. Gaga is not that accurate anyway.
 
In 1964 I was on the school bus (the bus and driver, Klem, lived 2 miles away) in the seat behind Klem. We were in a snow drift about 14 inches deep and getting stuck. It was a 1948 Diamond T, and we were trying to back out of the drift, I heard a bit of added noise from the engine. As I watched the gauges, I noted a wiggle in the oil pressure that was in sync with the RPM. We struggled in the drift for about 5 minutes, going forward and back maybe 50 feet each time. The engine noise turned into a knock, and the needle on the gauge dropped to 20 PSI each revolution, from the 40 psi that was normal. I asked Klem if we were going to loose the engine. He said we already did, but he was going to keep it alive so we stayed warm. Andy (a school mate and friend of mine) had just been picked up about 300 yards prior, and he had a dad at home, and a Farmall M with plow, heat Houser, and chains. Klem asked andy to trudge back and ask for help. We were pulled backwards to Andy's house, where we stayed until a different bus came and took us all home.
I do not care if the gauge wears out, I remember that indication of pressure variation to this day, and find that the engine is more valuable than the gauge. Jim
 
guess I will add a bit too. I don't really go out and actually bleed the guage. plus gauges nowadays will have a small orfice in the inlet to prevent shock loading the guage. applies more to high pressure gauges.
 
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