Quantcast Pneumatic Controls

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4 SHIJTDOWN OF CONTROLS.  B e f o r e turnoff of a controller or control system for
repairs, inspect the installation, observe the operation, and list all
necessary repair work.  Transfer from automatic to manual control and remove
t h e controller from service.
5 EMERGENCY PROCEDURES.  R e p a i r all leaks as soon as possible. In case of a
c o n t r o l l e r failure, change from automatic to manual control.  Remove the
c o n t r o l l e r from service and make necessary repairs.
5 . 1 Pneumatic Controls.
I n case of defective or erratic operation of
p n e u m a t i c control systems caused by oil and/or water in the instrument air
s u p p l y , investigate the following conditions.
q Condition of Instrument Air Compressors.
Compressors should be
m a i n t a i n e d in good condition to minimize oil carryover with the air.
q Rate of Oil Feed to the Compressors.
O i l feed rate should be the
m i n i m u m required for adequate lubrication.  Use type and quantity of
oil recommended by the manufacturer.
q Carbon Rings.
I n v e s t i g a t e possible use of carbon ring or carbon
c y l i n d e r liner compressors which do not require cylinder lubrication.
q Aftercoolers, Separators, and Driers.
Check operation of the
I n v e s t i g a t e possible installation of additional equipment
f o r moisture removal.
5 . 2 E l e c t r o n i c C o n t r o l s .  Proceed as follows when erratic or erroneous
o p e r a t i o n is contributed to electronic control equipment.
q Inspect system by sections to isolate the faulty equipment.
q Inspect all wiring and connections for defects.
q Troubleshoot suspected equipment for malfunction.
q Repair or replace components according to manufacturer's manual.
6 CASUALTY PLANNING.  T h e operators should be familiar with the arrangement
a n d location of controllers, valves, and associated equipment.  P r o v i d e the
o p e r a t o r s with manufacturers' i n s t r u c t i o n manuals and diagrams. Schedule and
c a r r y on periodic drills to change rapidly and safely from automatic to manual
c o n t r o l , and from manual control to automatic.  The operators must be capable
o f heating the system safely and efficiently on either manual or automatic
c o n t r o l .  G i v e operators definite instructions on emergency procedures.
7 INSPECTION AND MAINTENANCE OF CONTROLS.  R e p o r t any malfunction in the
c o n t r o l systems.  O n l y authorized and trained personnel should repair,
c a l i b r a t e , o r a d j u s t c o n t r o l s .  L o o k for leaks.  R e t i g h t e n glands if
P e r f o r m the following procedure after every 8 hours of operation of
pneumatic control systems.


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