398 Glossary of Terms and Abbreviations
Grease Fitting: A small tting that connects a grease gun and the component to
be lubricated. The tting is installed by a threaded connection, leaving a
nipple to which the grease gun attaches.
Grease Gun: A tool (normally hand-powered) that is used for lubrication tasks. By
squeezing the trigger of the gun, grease is applied through an aperture to a
specic point.
GTL (Gas-to-Liquids Process): The Fischer–Tropsch process is a catalytic con-
version of synthesis gas (a mixture of carbon monoxide and hydrogen) to
straight-chain parafns that include diesel fractions and waxes. These high-
quality products contain no sulfur, nitrogen, or oxygen and practically no
aromatics or naphthenes, and can be used to ...