How are the bearings failing? Ball, roller, needle, or what?
"You see, wire telegraph is like a very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? Radio operates the same way: You send signals here, they receive them there. The only...
What kind and temp. of the water? Cl- level? Continuous or intermittent flow?
"You see, wire telegraph is like a very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? Radio operates the same way: You send signals here, they receive them...
That looks like a somewhat unusual fatigue fracture. You need to find out how hard the shaft was supposed to be and how hard it is--from surface to core. You have a pretty "lean" heat of steel compared with real 4140, and it probably wouldn't harden if quenched in the usual oil/polymer.
It...
Can you post good pictures of the fracture surfaces? What diameter is the shaft? Required and actual hardness?
"You see, wire telegraph is like a very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? Radio operates the same way: You send...
Where's the photo?
Monel resists reducing conditions, while the stainless steels resist oxidizing.
"You see, wire telegraph is like a very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? Radio operates the same way: You send signals...
The core hardness isn't the problem. You could try raising the tempering temp. a bit to get a slight reduction in surface hardness. If that doesn't help. I'd be tempted to look into a "micro" shot peening effort. The idea would be to use fine shot size, and only peen in the minor dia. areas...
Is it possible to straighten after tempering? I think straightening before is asking for cracks.
How much movement are you correcting? A Rc61 surface won't take much movement at all. Have you correlated the cracking vs amount of straightening needed?
"You see, wire telegraph is like a very...
Cardboard honeycomb.
"You see, wire telegraph is like a very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? Radio operates the same way: You send signals here, they receive them there. The only difference is there is no cat." A. Einstein
How is the pipe itself protected?
"You see, wire telegraph is like a very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? Radio operates the same way: You send signals here, they receive them there. The only difference is there is no cat."...
Try Nitronic 60 or equiv., depending on your cl- level, etc.
"You see, wire telegraph is like a very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? Radio operates the same way: You send signals here, they receive them there. The only...
No on the first question. If you mean the likelihood of HAZ cracking w/o pre or post weld HT, then yes.
"You see, wire telegraph is like a very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? Radio operates the same way: You send signals...
CE isn't used to determine the max. hardness a steel can reach. It is a measure of hardenability, which means how deep/thick that steel is capable of being hardened. It is related to the time a steel takes for austenite to transform by diffusion to pearlite. The higher the CE, the less time...
"Carbon steel" has a wide range of compositions that apply to your questions. There's low, med and high C, along with lots of small amounts of elements that can affect hardenability. Even the allowable variations of some elements in low alloy steels can make a big difference.
So yes, a PWHT...
You have to get a lot of info about the water and flow conditions. Is the water in a closed loop? Is it treated? With what?
Wet lagging with a lot of cl- will probably ruin that pipe at that temp. Hopefully whoever designed it knew what they were doing.
"You see, wire telegraph is like a...
Too many unknowns. What is flowing? Chloride content? Constant flow? Temp? Cl- of lagging?
For now, do not let the initial fill water to stay stagnant in the pipe w/o lots of high-flowrate flushing.
"You see, wire telegraph is like a very long cat. You pull his tail in New York and his...
