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Minimum Access Provisions-Process Unit and Offsites

Posted by Antony Thomas at Wednesday, November 16, 2011








Minimum Access Provisions-Process Unit and Offsites Layout
Guide




Minimum
Access

Type of
Item to be Accessed

Platform
- Items Located
Over Platform

Elevated
heat exchangers
Elevated
control valves (all sizes)
Manholes
(higher than 3658 mm (12 ft.) above grade)
Relief
valves (NPS 102 mm (4”) inlet and larger on vertical vessel)
Process
blinds (higher than 3658 mm (12 ft.) above grade)
Furnace
soot blowers
Furnace
burners (when not accessible from grade)
Furnace
observation doors and sample ports (higher than 3658 mm
(12
ft.) above grade)
Elevated cleanouts

Platform
- Items Located
at Edge of Platform

NPS
102 mm (4”) and larger gate and globe valves at vessels
Battery
limit valves in elevated pipe racks
Elevated
motor operated valves
Relief
valves - NPS 77 mm (3”) inlet and smaller on vertical vessels
Relief
valves - All sizes on horizontal vessels
Level
controllers (higher than 3658 mm (12 ft.) above grade)
Sampling
devices on vessels (higher than 3658 mm (12 ft.) above
grade)

Permanent Ladder

All
sizes of check valves at vessels
NPS
77 mm (3”) and smaller gate and globe valves at vessels
Level
controllers between 2134-3658 mm (7-12 ft.) above grade
Level
gauges and valves
Furnace
observation ports between 2134-3658 mm (7-12 ft.) above grade
Instruments
requiring routine access
Handholes
Elevated electrical
substations and equipment

Mobile Stair

All
servicing between 2134-3658 mm (7-12 ft.) above grade except as
noted in this Table

No Permanent Access

Block
valves in pipe racks (except at battery limit)
Elevated
orifices or meter runs
Nozzles
on vessels (without process blinds or valves)
Check
valves not at vessels
Temperature
connections in piping
Pressure
connections in piping
Silencers
or exhaust heads
Metal
temperature measuring points on vessels
Instrument
connections on furnaces







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