Double Bottom Hydro Cylnders : LUSENET : Elevator Problem Discussion : One Thread

Hi There Does anyone have a survey list of all hydro jack mfg. that have data on the hydro cylnders, everyones concerned about removing single bottom cylnders. It seems like someone has allready made a list of equipment to be concerned about.

-- Jim (, February 22, 2004


Basically the code changed in 1975, everything before this is single bottom

-- woodstock (, February 26, 2004.

Anything Pre-1970 has been considered by ANSI to be single bottom, although there jacks out there of this vintage that aren't... The Code requirements for anything Pre-1970 are Relief Valve and Pressure Tests every 6 months...

-- Bill (, February 29, 2004.

It is my opinion that a lot of the single / double bottom jack stuff is a ripoff. We replaced a number of jacks that were purported to be single bottom by the OEM, and they turned out to be double bottom. These jacks did not have one single pit in the cylinder.

Additionally, Esco had exclusively used double bottome jacks since 1960. Yes the code changed in 1970, and some big OEMs didnt keep good records, or choose to discard the records and push for jack replacements using the "safety issue" as the clencher.

The problem is that you cant advise an owner aganst replacement, unless you can prove that there's a double bottom down there.

-- Mike (, March 08, 2004.

I'm the owner of such a "single" bottom elevator. How can I prove if my US Elevator installed 1970 has one or 2 bottoms?

-- garnik derian (, May 18, 2004.

Moderation questions? read the FAQ