Maintenance
October 2014
5-12
06-236115-001
5-5.3
Retest
DOT 4BA and 4BW cylinders used exclusively in HFC-227ea services that are commercially free
from corroding components are required to be hydrostatically retested and restamped every
five years, in accordance with the
DOT Regulatory Compliance Guide, 49 CFR 180.209
, prior to
recharge and shipment. An alternate option is an external visual inspection performed in lieu
of the hydrostatic test at the time the periodic retest becomes due (this option is in accordance
with CFR 49, Paragraph 180.209). Table 5-2 highlights the two options for retesting HFC-
227ea cylinders.
5-5.4
Flexible Hoses
In accordance with NFPA 2001 Edition 2012 (Clause 7.3), all system hoses shall be examined
annually for damage. If visual examination shows any deficiency, the hose shall be replaced or
tested.
5-6
SERVICE
5-6.1
Cleaning
Remove dirt from metallic parts using a lint-free cloth moistened with dry cleaning solvent. Dry
parts with a clean, dry, lint-free cloth, or air blow dry. Wipe non-metallic parts with a clean,
dry lint-free cloth. Remove corrosion with a crocus cloth.
5-6.2
Nozzle Service
Service nozzles after use as follows:
1. Clean the outside of the nozzles with a rag or soft brush.
2. Examine the discharge orifices for damage or blockage. If the nozzles appear to be ob-
structed, unscrew the nozzles and clean by immersing them in cleaning solvent. Dry thor-
oughly with lint-free cloth. Replace damaged nozzles. Nozzles must be replaced with the
same part number in the same location. See Paragraph 4-2.3.5 for the correct nozzle place-
ment and orientation.
Table 5-2. Retest Schedule
Retest Method
First Retest Due
Subsequent Retest Due
Special Marketing
Full hydrostatic test including
determination of cylinder
expansion
5 Years
5 Years
Retest Date Month/Year
External visual inspection per DOT
Regulatory Compliance Guide, 49
CFR 180.209 and CGA Pamphlet
C-6, Section 3
5 Years
5 Years
Retest Date Followed by
“E”
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