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NAR Hardware Subcommittee. Wednesday, October 11 th 2006. NAR Hardware Subcommittee. New Chairman – Joe Perez 5 Docket Task Forces, 0 New TF 1 Docket Task Force will present recommendations 2 Previously Closed in April ’06- No Recommendations. NAR Hardware Subcommittee Docket Structure.

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nar hardware subcommittee

NAR Hardware Subcommittee

Wednesday, October 11th 2006

nar hardware subcommittee2
NAR Hardware Subcommittee
  • New Chairman – Joe Perez
  • 5 Docket Task Forces, 0 New TF
  • 1 Docket Task Force will present recommendations
  • 2 Previously Closed in April ’06- No Recommendations
nar hardware team i f a r r
NAR Hardware Team – I.F.A.R.R.
  • ISSUEs – Issues established with discussions by subcommittees
  • FACTs – What does the data show? Deal with the facts!!
  • ANALYZE – What is the root cause of the component’s NAR. Is the problem really attributable to the design of the component?
  • RECOMMENDATIONs - Develop potential conceptual solutions addressing the root cause. What can be done to the component to ensure it does not leak?
  • RESULTS - NAR Subcommittee makes recommendation to AAR TCC to start a Task Force to look at potential new requirements
nar hardware subcommittee nh 2005 2 hinged bolted mw covers
NAR Hardware SubcommitteeNH-2005.2 Hinged & Bolted MW Covers

Actions

  • Push for torquing standards through other subs. – NOT Established

Further Discussion/Investigation/Research

  • Recommend or mandate use of softer gasket mat’ls
  • Recommend the use of 8 bolt manway covers
  • Reduce the use or eliminate the use of classic hinged and bolted manway covers
nar hardware subcommittee nh 2005 2 hinged bolted mw covers6
NAR Hardware SubcommitteeNH-2005.2 Hinged & Bolted MW Covers

Elimination of H & B manway covers

  • Query shippers on need for convenient use of the manway cover.
    • Frequency of opening
    • Splash loading vs. closed loop
    • Venting purposes
    • Tank entry, Cleaning, and Visual Inspection access
  • Suggested distribution of ACC & API members for survey.
  • IS THERE A NEED FOR H&B MANWAY??
nar hardware subcommittee nh 2005 3 shear plane arrangement
NAR Hardware SubcommitteeNH-2005.3 Shear Plane Arrangement

Actions

  • Use of gaskets that allow for centering and better sealability (e.g. pinwheel gaskets) with fasteners and arrangements that accommodate shearing of the valve to nozzle connection

Closed in April \'06

nar hardware subcommittee nh 2005 4 1 eliminate vrvs
NAR Hardware SubcommitteeNH-2005.4.1 Eliminate VRVs

Actions

  • Decision to allow car manufacturers and owners continue to require Vacuum Relief Valves as standard on non-pressure cars. Shipper can request their elimination based upon knowledge and control of the operation of the cars.

Closed in April \'06

nar hardware subcommittee nh 2005 4 2 vrv design concerns10
NAR Hardware SubcommitteeNH-2005.4.2 VRV Design Concerns
  • MANY Potential Recommendations.
  • Provide design that is less prone to leak in a roll over condition
  • Enhanced Seal Design – Quad Seal Rings vs. O-Rings
  • Review Test Protocol for New Valves (Reseating Capabilities)
  • Use of Corrosion Resistant Seats/Valves (e.g. Stainless Steel)
  • Providing the Stem Profile Below the Body Casting
  • Tying the Cap to the Valve Body and not the Stem
  • Investigate whether higher Vacuum Rating Pressures may assist the seating and reseating characteristics of the valve
nar hardware subcommittee nh 2005 4 2 vrv design concerns11
NAR Hardware SubcommitteeNH-2005.4.2 VRV Design Concerns
  • WHERE TO FOCUS? No progress on recommendations
  • VRV NAR is not high compared to other NARs on NON-Pressure cars
  • Still warrants subcommittee to move forward on recommendations, but WHICH ONE
nar hardware subcommittee nh 2006 1 1 prds springs on aa cars
NAR Hardware SubcommitteeNH-2006.1.1 PRDs Springs on AA Cars

Proposal:

Mandate the use of a Corrosion Resistant Spring on an AA PRD (was written as Aluminized)

Background:

SCC issues on carbon steel springs in AA service

DOCKET T90.13 ALREADY EXIST

Research and Data:

  • Stainless steel (or other alloys) springs
  • Other protection (coatings, etc.)
  • Increased inspection intervals
  • Enhanced inspection techniques
  • Lower O2 levels in tank (N2 pads)
  • Lower stress levels in springs
nar hardware subcommittee nh 2006 1 1 prds springs on aa cars15
NAR Hardware SubcommitteeNH-2006.1.1 PRDs Springs on AA Cars
  • AAR/BOE database – the use of aluminized, SST (or other alloy) springs, protective coatings can not be queried.
  • Also inspection intervals, enhanced inspection, Oxygen level in cars can not be queried.
  • Low Activity from this subgroup
nar hardware subcommittee nh 2006 1 2 prds valves o rings
NAR Hardware SubcommitteeNH-2006.1.2 PRDs (Valves) O-Rings

Discussion:

Issues with O-Rings in service on PRDs (Valves)

Research and Data:

Where is the problem?

  • Deterioration
  • Misalignment
  • Missing
  • Incompatible
  • Incorrect Size

Low Temperature capabilities of common elastomers

nar hardware subcommittee nh 2006 1 2 prds valves o rings18
NAR Hardware SubcommitteeNH-2006.1.2PRDs (Valves) O-Rings
  • AAR/BOE Database – O-ring material can not be queried. Can not conclude, unless shippers/owners provide the information.
  • What causes deterioration? Need to investigate
  • Qualification Dates (age of O-ring) – Need to investigate.
  • Low Temperature capabilities of common elastomers
  • DuPont (Chief Engineer) consultant added to team
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