loam - LS
- loamy sand
- loamy soil
- local area network
- local bus slot
- local control network
- local control room
- local lockout
- lock-nut
- lockout
- logic calculation block
- logic manager
- logic product block
- logic sum block
- long-welding-neck nozzle
- loop in
- loop line
- loop out
- loop testing
- loose
- low density polyethylene
- low pour point
- low pressure condensate
- low pressure flare
- low pressure heater
- low pressure steam
- low-input cutoff value
- low-limit alarm setpoint
- low-pass filter
- lower circulation reflux
- lower explosive limit
- LP steam jacketed line
- LPA
- LPCKIT
- LPG
- LPG forwarding pump
- LPG storage with r/w & track loading facilities
- LPG surge drum
- LPG vaporizer
- LRSW
- lrsw
