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Eyewashes must deliver 0.4 gpm for 15 minutes, Eye/Face washes must provide 3 gpm for 15 minutes. The top of the Eye or Eye/Face wash water flow must not fall below 33" (83.8 cm) and can be no higher than 53" (134.6 cm) from the floor surface floor the user is standing on (Section 5.4.4).
Boilers using the pressure jet type of burner, i.e. with a fan, (usually with 35 second oil) can achieve a turndown ratio of 2, while the rotary cup type burner can achieve 4. [3] Condensing oil boilers are fairly unusual; the condensate from the combustion of oil is far more aggressive than gas, mainly due to sulphur content.
A washer with a "wave" in the axial direction, which provides spring pressure when compressed. Wave washers, of comparable size, do not produce as much force as Belleville washers. In Germany, they are sometimes used as lock washers but they are less effective than other choices. [a] [8] Split washer or spring lock washer