Check out this link:
http://web.princeton.edu/sites/ehs/labsafetymanual/cheminfo/oxygen.htm
and also:
http://eweb.processplants.boc.com/msds/msds.htm
for some good data/advise on oxygen handling..
If u require oxygen compression, then consider Vertical Labyrinth Piston Designs from Sulzer...
Strictly speaking inorder to qualify as a "Metering" pump, the pump is expected to deliver an accuracy level of +/-1%. It should also demonstrate this accuracy over a reasonable turndown range (usually 10:1) and must also demonstrate a reasonable degree of repeatability in delivering the same...
Every pump design has a minimum continuous flow(MCF) on thermal considerations which is called as the thermal MCF. This information should be obtained from the pump vendor.
While low energy pumps can even run almost continuosly at shutoff, this is generally not possible for high energy pumps...
