Protecting Cast iron pipes
Protect disturbed cast iron from.....
Vibrations, impact forces, earth movement
Replacement pipe should be _____ to extend an approximately equal distance on each side
centered
Whenever a heavy load is imposed over cast iron
Contact corporate engineering
WGL does not operate cast iron pipe at pressures____ ____ psig.
greater than 25 psig
AOC
Abnormal Operation Condition
Permanent protection must _____ or ______ than design and construction requirements
Equal or greater
Other conditions where consideration for protection should be given include
Water leaks, sewer failures, excavation for construction, Excavation for repair
Methods of protecting cast iron from heavy loads include
Matting
Steel plates
If joint that is subject to pressures of 25 psig or less, ___________
Seal by means other than caulking
Incorrect mechanical fitting
Human error
Less than 3'________________________________________________________________
monitor for properly compacted backfill and appropriate support
Realign Cast iron pipe
False
too preserve the integrity of pipeline
Remove heavy loads
If plastic is used, _____ or _____ #12 copper wires
bond or clamp
Gas leak
AOC
More than 3' exposed pipe
Replace 8" and smaller pipe to a distance outside of soils angle of repose
Where cast iron is disturbed or could be disturb
Support with bridging bracing, suitable backfil material
Perform special surveys ____ and _____ heavy loads
before and after
_____ the leak or damage.
Evaluate
Heavy equipment over site
Human error