Page 38 - WM E-Learning Handbook

P. 38

Module 6: CNG Defueling

Learning Objectives
1. Identify the circumstances when CNG fuel systems must be defueled
2. Identify the two Waste Management fuel reduction and defueling methods.
3. Identify the defueling port and related plumbing

Slide Topic Content Notes

When and Why Defueling a  Planned defueling

CNG Powered Vehicle Is  Cylinder out of date

Necessary  Final disposal of vehicle

 Service related

 Component

replacement

(warranty, recall,

failure)

 Emergency defueling
 Cylinders are damaged and need

to be repaired or replaced
 A valve, PRD or other system

component is damaged or in

poor working order and needs to

be replaced

Required Defueling  Plumbing
Equipment and Plumbing  Defueling receptacle
on Vehicle  Three-way valve
 Different from the one on

the face of the FMM

 Defueling nozzle

 Defueling hose

 Place to put gas

Typical CNG Fuel System
Defueling Plumbing (With
Defueling Port)

33 34 35 36 37 38 39 40 41 42 43