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SECTION 4 - MAINTENANCE, ADJUSTMENT, & CALIBRATION
4-1. Tools Required for Maintenance and Calibration
A calibration tool kit (P/N 0202-1005B) containing the necessary tools is avail-
able from the factory. The following tools are required for maintenance and
calibration of the DPU:
Table 4-1. Tools
Description
Purpose
Screwdriver
Bracket screws
7/16" Hex wrench
Housing bolts
5/8" Hex wrench
Housing bolts
3/4" Hex wrench
Housing bolt/stud nut (6,000 PSI units)
1/8" Allen wrench
Dampener Adjustment
1/2" Open end wrench
Pushrod - bellows cup connection
1/2" 12-point socket
Housing bolt (6,000 PSI units)
Modified Box/Open-ended Wrench
Kickoff spring lock nut
(7/16")
100 ft.-lb. Torque wrench
Housing bolts
4-2. DPU Inspection and Cleaning
WARNING
(High-pressure Gas Installations
with pressures greater than 200 psig)
HIGH-PRESSURE GAS HAZARD ON DISASSEMBLY OF THE DPU.
TO PREVENT POSSIBLE SEVERE PERSONAL INJURY, DEATH,
OR SUBSTANTIAL PROPERTY DAMAGE DUE TO THE RELEASE
OF INTERNAL PRESSURE,
PERFORM THE PRESSURE CHECK
PROCEDURE THAT FOLLOWS (Step A)
BEFORE REMOVING THE
DPU HOUSING BOLTS
.
NOTICE
If accumulation of solids or semi-solids is extensive, remove the housings
carefully to prevent damaging the bellows.
WARNING
(Housing Bolts)
DO NOT REUSE HOUSING BOLTS.
IF BOLTS ARE
DISTURBED, REPLACE WITH NEW BOLTS, PER TABLE 4-2
(STANDARD) or TABLES 4-3/4-4 (NACE).
REUSE OF HOUSING BOLTS
, ESPECIALLY IN CRITICAL
APPLICATIONS LIKE HYDROGEN SULFIDE AND SALT WATER
EXPOSURES,
CAN RESULT IN SEVERE INJURY, DEATH
OR SUBSTANTIAL PROPERTY DAMAGE DUE TO BOLT
FAILURE.
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