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Steam Stationary Engines, Traction Engines Antique steam engines, their boilers, pumps, gauges, whistles and other related things that make them run.

Steam Stationary Engines, Traction Engines

Pressure Test the Boiler? Pressure Pump


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  #41  
Old 06-19-2019, 02:40:49 PM
Casemaker Casemaker is offline
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Default Re: Pressure Test the Boiler? Pressure Pump

Interesting because i asked for evidence of shifting or cracking caused by cold water tests of 350 pounds or less......that was in 2008.....no evidence yet.
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Old 06-19-2019, 04:52:49 PM
Odin Odin is offline
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Default Re: Pressure Test the Boiler? Pressure Pump

I think you'd be hard pressed to find anyone willing to share such evidence.

Firstoff, the people doing hydrotests far enough above MAWP to cause such damage probably would not recognize that kind of damage as having been caused by excessive hydro pressures. They would just see it as the boiler getting old and needing the more expensive repairs made.

Secondly, its rare for certain failures to be talked about on the Stak. People seem to get embarrassed by them and don't want to hear the commentary on how they could have prevented it. They just quietly repair it and move along, have to get it to pass inspection in time for that year's big show.

But metal fatigue is a very real issue with boilers, and I'd wager second only to corrosion for causes of boiler failure. Each time the steel stretches and relaxes again- one pressure cycle, that is a load cycle on the steel. Every cycle then in turn weakens the steel slightly, decreasing its tensile and yield strength until de-rating is necessary to maintain safety margins.
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  #43  
Old 06-19-2019, 08:22:59 PM
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K.O'Connell K.O'Connell is offline
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Default Re: Pressure Test the Boiler? Pressure Pump

Dave Richards picks up an 1897 Whitcomb planer at the West End Machine Shop where they specialize in making hydrostatic pumps for testing steam boilers. The pumps are at 05:20.

https://www.youtube.com/watch?v=zhWO6Zoz-EU
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  #44  
Old 06-20-2019, 10:59:26 AM
Casemaker Casemaker is offline
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Default Re: Pressure Test the Boiler? Pressure Pump

Like most hobbies....there are old wives and old wives tales......
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Old 06-21-2019, 04:25:57 PM
SteamLoco726 SteamLoco726 is offline
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Default Re: Pressure Test the Boiler? Pressure Pump

Here is an example of a cheap method of pressurizing your boiler. Any boiler hand feed pump must overcome the steam pressure in the boiler in order to deliver water. Any live steam pump, however slow depending on the size of the ram, will pump up the boiler.

https://www.ebay.com/i/382942687892?chn=ps
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