Cashco DAP - Manual (Page 3)

IOM-DAP 3
9. Develop system fl ow to a level near its expected
normal rate, and reset the regulator set point by
adjusting the loading system pressure control
setpoint to the desired outlet pressure level.
SECTION VI
VI. SHUTDOWN
1. Shutoff process loading pressure if other than
main valve process fl uid source.
2. Shutoff inlet block valve.
3. Allow suffi cient time for the line pressure down-
stream of the inlet block valve to bleed down.
4. Shutoff the outlet block valve.
5. Relieve the trapped upstream and downstream
pressure and loading pres sure.
6. The regulator may now be removed from the
pipe line or disassembled for inspection and pre-
ven ta tive main te nance while in-line.
VII. MAINTENANCE
A. General:
1. The regulator may be serviced without re mov-
ing the regulator from pipeline. The regulator
is designed with quick-change trim to simplify
maintenance.
2. Record the nameplate information to req-
ui si tion spare parts for the regulator. The
in for ma tion should include: size, KM Product
Code, Serial Number, and internal or ex ter nal
sens ing. (NOTE: Never both types of sensing.)
If external sensing is used, be sure that the
external sensing line is connected.
3. Refer to Section VIII for recommended spare
parts. Only use original equipment parts sup-
plied by Cashco/KM for re build ing or re pair ing
regulators.
4. Owner should refer to owner's procedures for
removal, handling, cleaning and disposal of
nonreuseable parts, i.e. gaskets, etc.
NOTE: Regulators originally supplied as
“special clean” – Opt-56, maintenance must
include a level of cleanliness equal to Cashco
cleaning standard #S-1542.
B. Main Regulator Disassembly:
1. Shut down the system in accordance with
Section VI.
2. Disconnect the external sensing line, if in-
stalled.
3. Though it is possible to disassemble the regu-
lator while installed in a pipeline, it is rec om-
mend ed that maintenance be done in a shop
when possible. The description hereafter will
assume shop disassembly. Remove regulator
from pipeline.
4. Place the body in a vise with the cover dome
(25) upwards.
5. Place matchmarks on body (23) and cov er
dome (25) fl ange.
6. Loosen body/cover dome fl ange bolts (11)
and nuts (12) uniformly and remove bolting.
7. Remove the cover dome (25) by lifting ver ti-
cal ly. Set cover dome aside.
8. Place a deep, offset, box end wrench over
the piston lock nut (7). Place another box
end wrench over the upper end of plug (20).
Loosen lock nut by rotating CCW (viewed from
above). Remove lock nut (7).
9. Lift piston (77) vertically up to remove. Set
piston aside on a fl at work area.
10. Remove lower, dynamic, u-cup balancing, side
seal (27). Inspect for wear, leakage, damage,
etc.; discard when inspection is completed.
NOTE: Seal may be found around the piston
(77) when it is withdrawn, or it may be nested
within the cage (19).
SECTION VII
10. Reduce system fl ow to a minimum level and
observe pressure set point. The maximum rise
in outlet pressure on decreasing fl ow should not
exceed 10%. If it does, consult factory.
WARNING
SYSTEM UNDER PRESSURE. Prior to per form ing any
maintenance, isolate the regulator from the system and
relieve all pressure. Failure to do so could result in per-
sonal injury.