Embed Size (px)
Citation preview
EQUIPMENT PERFORMANCE –SPILL PREVENTION AND PIPING
20th ANNUAL NATIONAL TANKS CONFERENCE
March 17-19, 2008
ATLANTA, GEORGIA
KEVIN HENDERSON
PETRO STOPPING CENTER – JACKSON, MS
SPILL BUCKETS: OPW “1”
Six 20,000 gallon tanks installed May 1999
One regular tank
One premium tank
Four diesel tanks all manifoldedtogether
Direct and remote fills for all six tanks (12 buckets)
Petro Stopping Center – Jackson, MS
DOUBLE-WALLED TANKS & PIPING
Interstitial Monitoring
Tanks – Hydrostatic
Piping – Electronic sump sensors
- Mechanical leak detectors
No indication of any suspected release with the release detection systems utilized by owner/operator (no alarms).
Observation wells installed at each corner of the tank bed but not utilized (never checked).
Petro Stopping Center – Jackson, MS
Petro Stopping Center – Jackson, MS
Inspected in May 2007
OPW “1”
OPW “1”
OPW “1”
OPW “1”
OPW “1”
OPW “1”
OPW “1”
OPW “1”
OPW “1”
OPW “1”
OPW “1”
“Duratuff”
OPW “1”
4800 Gallons Recovered
Petro Stopping Center – Jackson, MS
What’s Wrong With This Picture ?
Ball Float Valves
Flex Connectors
1-2
3-4
5-6
7-8
9-10
11-12
13-14
15-16
PREMIUM
REGULAR R-2R-1
P-1 P-2
R-2 replaced July 2006 by Contractor A because fuel found dripping from conduit into STP sump.
R-1, P-1 and P-2 replaced March 2007 by Contractor B.
Originally piped with Western flex pipe in rigid PVC electrical conduit May 1997.
STORE
PIPING: APT – XPThe Pantry - Flowood, MS
APT - XP
APT – XPDispenser 11-12 Premium
APT – XPDispenser 9-10 Premium
APT – XPDispenser 9-10 Premium
APT – XPDispenser 1-2 Premium
APT – XPDispenser 9-10 Premium
28 feet between dispensers
6 inches cut off pipe to get riser lined-up underneath dispenser 9-10
Represents 1.8 % swell rate
APT – XP
R-1 (installed July 2006) and R-2 (installed March 2007) have not significantly swelled.
P-1 installed March 2007 has swollen enough to crack shear valve at termination dispenser (1-2) at least once. No length had to be cut off this pipe.
P-2 installed March 2007 has swollen significantly:
Shear valve at terminating dispenser (9-10) has been broken at least twice. 6 inches cut off the length of this pipe.
Shear valve at dispenser 11-12 cracked at least once.
Installed October 2005
Passed precision tightness testing
Brought into use June 2006
Leak Reported July 2006
PIPING: UPP – EXTRA
MURPHY OIL -GREENWOOD, MS
Leaking Coupling Coupling Already Replaced
3rd Coupling Not Leaking (out of picture frame)
UPP – EXTRAMurphy Oil – Greenwood, MS
Leaking Coupling -Note fuel within sockets of welding pins.
Welding Sockets
Secondary to Primary Termination Fitting
Primary Piping
Termination Fitting
Coupling Welding “Indicators”
UPP – EXTRAMurphy Oil – Greenwood, MS
Pipe
Coupling
Termination Fitting
UPP – EXTRAMurphy Oil – Greenwood, MS
Analysis on reported leakage of fuel through welding pins
PetroTechnik
Analysis of the sample received• Pressure test on the sample could not
replicate the leak through the welding pins• The sample was subjected to X-Ray, and
the result highlighted two important facts:
Pipe and termination fitting were not fully insertedThe assembly was exposed to bending stress during welding
Incomplete insertion
X-ray:Resistor displacement induced by
welding under stress
Conclusions• The assembly was exposed to external loads and partial
insertion of either the pipe or fitting prior and during electrofusion. Both the partial insertion and external loading resulted in the molten material moving into the bore of the welding coupler. Molten material was forced out of the fusion area to form material tongues.
• This movement of molten material has resulted in unsatisfactory fusion welds. The movement of molten material has also resulted in the exposure of the welding coil.
• Thus the cause of the assembly failure is due to poor installation with the pipe and fitting not fully inserted squarely and also the assembly exposed to external forces prior to, during and after electrofusion.
• The x-ray results of the original Murphy sample conclude the original findings that poor installation of pipe and fitting was the cause of the assembly failure.
Actioned• Review of installation manuals and
documentation emphasizing the critical steps
• Efficiently communicate this information to installers
• Post the revised installation manual on Murphy Oil’s web site
• Petrotechnik is progressively recertifyingcontractors in line the Murphy new site build program
MURPHY OIL - INDIANOLA, MS
Installed October 2005
Passing precision tightness test results
Inspected May 2007
UPP – EXTRA
UPP – EXTRAMurphy Oil – Indianola, MS
Premium Sump
UPP – EXTRAMurphy Oil – Indianola, MS
Regular Sump
UPP – EXTRAMurphy Oil – Indianola, MS
ENVIRON – GeoFlex
ENVIRON – GeoFlex+Plus
ENVIRON – GeoFlex+Plus
