For every task in CNG Maintenance, the following safety
requirement must be strictly enforced:
Comply with personal and environmental safety practices
associated with clothing; eye protection; hand tools; power equipment;
proper ventilation; and the handling, storage and disposal of chemicals
in accordance with local, state, and federal safety and environmental
regulations.
| VII. CNG MAINTENANCE |
|
| A. General |
|
| 1. Interpret and verify complaint;
determine needed repairs. |
P-2 |
| 2. Follow manufacturer's maintenance
schedule to ensure fluids and lubricants are at proper levels and
serviced with recommended products. |
P-2 |
| 3. Identify the process of recertification
or replacement of fuel supply container(s) according to most current
regulations (e.g., NGV-2, DOT); complete documentation; remove and
replace fuel supply container, if required. |
P-2 |
| 4. Inspect fuel supply container(s) and
brackets as it relates to certification: data plate, working pressures,
fuel supply container damage, valves, bolts, torque specifications, and
all sealing and venting equipment. |
P-1 |
| 5. Inspect air filters and fuel filter;
service or replace as needed. |
P-2 |
| 6. Inspect and ensure that all required
emission control devices are present and functional. |
P-1 |
| |
|
| VII. CNG MAINTENANCE |
|
| B. CNG Fuel Storage and Delivery |
|
| 1. Interpret and verify complaint;
determine needed repairs. |
P-2 |
| 2. Inspect, adjust, and test manual
shut-off valve, service valve, check-valves, and solenoid valves; repair
or replace as needed. |
P-1 |
| 3. Empty fuel supply container according
to manufacturer's procedures and all local, state and federal
regulations. (Local procedures will vary and extreme care must be
exercised if using actual fuel. Use of inert gas is recommended for this
task.) |
P-1 |
| 4. Inspect and test fuel selection system
components; repair or replace as needed. |
P-2 |
| 5. Select and install swage, compression,
flare, captive O-ring, NPT, and other fittings using manufacturer's
recommended sealants when required. |
P-1 |
| |
|
| VII. CNG MAINTENANCE |
|
| C. CNG A/F Management |
|
| 1. Interpret and verify complaint;
determine needed repairs. |
P-2 |
| 2. Check for fuel system problems caused
by fuel contamination. |
P-3 |
| 3. Check air/fuel system integrity (e.g.,
fuel leaks, air leaks, components compatibility/application); determine
needed repairs. |
P-2 |
| 4. Inspect and test fuel pressure
regulation system components; adjust, repair or replace as needed. |
P-2 |
| 5. Remove, clean, and reinstall throttle
assemblies; adjust related linkages as needed. |
P-3 |
| 6. Check/adjust idle speed and fuel
mixtures according to manufacturer's procedures. |
P-2 |
| |
|
| VII. CNG MAINTENANCE |
|
| D. CNG Fuel Storage and Handling |
|
| 1. Interpret and verify complaint;
determine needed repairs. |
P-2 |
| 2. Perform safe fueling procedures and
determine fuel level. |
P-1 |
| 3. Identify working pressures and
demonstrate an understanding of fuel characteristics as they relate to
temperature and fill procedures. |
P-1 |
| 4. Empty fuel system using
industry practices or manufacturer's procedures and all local, state and
federal regulations. (Local procedures will vary and extreme care must
be exercised if using actual fuel. Use of inert gas is recommended for
this task.) |
P-1 |
