The German and English words both refer to the distance between a component or assembly (such as a circuit board, mechanical assy or whatever) above/away from the surface on which it is mounted.

I would strongly advise rewording the translation, e.g. 'The threaded rods/studs used to mount the xxx enable continuous adjustment of the standoff distance.' (That's off the top of my head; you could certainly pretty it up a bit.)

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Note added at 59 mins (2005-10-20 22:07:40 GMT)
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Hmmm, my explanation suffers from revisionitis, but you probably get the idea: the separation between the item and the surface it is mounted on.

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Note added at 2 days 22 hrs 53 mins (2005-10-23 20:01:33 GMT)
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Given the additional context, I still suggest 'standoff' as a noun or adjective (and rewording if necessary to allow it to be used that way).
It's clear that your context is pipe installation and not mechanical assembly, but the principle is the same: in an engineering context, 'standoff' is the distance from a support structure to some other item mounted at some defined distance away that structure. Although you could also 'elevated' or 'suspended' (as suggested by John) in the right context, IMHO 'standoff' is more general (for one thing, which word would you use with a vertical pipe run?).

In the second context example, I would render 'Die Aufständerung auf das gewünschte Rohrachsmass...' along the lines of 'Achieving the desired pipe axis standoff...'.

refs:

IIX STANDOFF BRACKETS
... single arm bracket, 39 inches long with a 1 1/8" od pipe that is 5 1/2 ... SO-1-S STANDOFF BRACKET Same as SO-1 but mounts on a flat surface with 2 ...
http://w9iix.com/ii00025.htm

Accessories for connecting to EZ Dock
Pipe Stand-off Bracket View Image
www.ezdockontario.com/accessories.htm

Web Exclusive—TOLCO "Stand-Off" Hanger and Restrainer
TOLCO™, a brand of NIBCO INC., offers a "stand-off" hanger and restrainer for CPVC plastic pipe that has a new one-piece design for fast and easy installation. TOLCO’s Figure 28 has a "stand-off" design that reduces installation time by eliminating the need for wood blocking extensions. In addition to its "snap-in" design, other advantages include flared edges to protect plastic pipe from scratches and abrasions. The product meets NFPA 13 requirements, and is UL listed as a Hanger and Restrainer. It is also UL listed for installation into 3/8" thick composite wood.
http://www.pmengineer.com/CDA/ArticleInformation/features/BN...