Liquefied natural gas fuel tank
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MAE 435 – Final Presentation Advisor: Dr. Zhang Liebherr representative: James Whitfield - Albert Ochagavia - Pithan Rojanavongse -Josh Harris - J ohn Alexander. Liquefied Natural Gas Fuel tank. LNG Background. What is LNG? Liquefied Natural Gas -162 ° C 1/600 volume of Natural Gas

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Liquefied Natural Gas Fuel tank

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MAE 435 – Final Presentation

Advisor: Dr. Zhang

Liebherr representative: James Whitfield

-Albert Ochagavia

-PithanRojanavongse

-Josh Harris

-John Alexander

Liquefied Natural Gas Fuel tank


LNG Background

  • What is LNG?

    • Liquefied Natural Gas

    • -162° C

    • 1/600 volume of Natural Gas

  • Why use it?

    • Cost

    • Availability

    • Efficiency

    • Environment


Project Statement

  • To design and analyze a Liquid Natural Gas (LNG) fuel tank for Liebherr’s current T 264 mining truck that conforms to all Pressure Vessel and LNG regulations and fits in the space available on the mining vehicle.


Project Goals

  • Design LNG Tank to fit Liebherr’s current T 264 Mining Truck

  • Maximize Volume for 8-12 hour operational time (35% work load)

  • Strictly follow pressure vessel and LNG standard regulations

  • Perform a Finite Elemental Analysis of the tank using SolidWorks


Tank Design Parameters

  • Space Available

  • Assumptions

    • Load factor of 35%

    • LNG engine efficiency equivalent to Diesel

    • ASTM Boiler and Pressure Vessel Code

    • Same tank design will be used for both tanks


Inner Tank

  • A240 Type 304 Stainless Steel

  • Total volume: 1800 L

  • Thickness: 1.75 inches

  • 2 parts (Shielded Metal Arc Welding Method)


  • Ullage Tank

    • Volume: 180 L

    • Increases hold time

    • Pump less fuel method

    • Full tank gauge

  • Rivets

    • Diameter: 2.5 inches

    • Length: 3 inches

    • Vertical and horizontal support


Insulation Layer

  • Multi Layer Insulator (MLI)

  • 1 inch thickness

  • Low thermal conductivity

    • K= 0.0001 W/m-k

  • High thermal resistance

    • R=1440 m^2K/W


Outer Shell

  • A240 Type 304 Stainless Steel

  • Made of 2 parts

    • Shielded Metal Arc Welding Method

  • Allows vacuum

  • Placement for rivets at the bottom


Manifold


LNG fuel tank


Gauges

  • Three Companies: Omega, Ashcroft, and WIKA

  • Two Gauges:

    • Fuel

      • Standard Size: ~ 2”

    • Pressure

      • Maximum tank pressure: 420 psi

      • Average Size: 1 – 2 ½”

    • Properties:

      • High pressure

      • High shock resistant

      • Cryogenic temperatures (304 SS)


Standard Diameter: 1 ½ “

Time efficient

Prevention of temperature and pressure changes

Function at cryogenic temperatures and atmospheric pressure

50 Gallons Per Minute

Material: Stainless Steel

The majority of companies are developing similar fueling methods

Quick disconnect and fueling

Parker, CryoMac, Carter, etc.

50 gallons per minute

Stainless steel

Fueling Methods


Three Major Components

  • Vent

    • Removing warmer gas

    • Sub-cooling LNG residual

    • Decrease in pressure

    • LNG facilities may have a vent connection

  • Liquid

    • For defueling tank (emergency situations)

  • Relief Valves

    • Reduces pressure

    • Safety feature


Rules & Regulations

  • NFPA 57 – Liquefied Natural Gas Vehicular Fuel Systems Code

    • Design, installation, operation, and maintenance of LNG engine fuel systems on vehicles of all types

  • SAE J2343 – Recommended Practice for LNG Medium and Heavy-Duty Powered Vehicles

    • Guidance for construction, operation, and maintenance of LNG heavy-duty vehicles for public transit and commercial applications


Safety Features

  • Ullage Tank

  • Pressure Relief Valves

    • 350 psi

    • 400 psi

  • Emergency Shutoff Valves

  • Defueling connection


Finite Element Analysis

  • Weight Analysis (4000 lbs)

    • Yielding stress 207 MPa (304 SS)

    • Max stress from FEA 22 MPa


Finite Elemant Analysis

  • Pressure (420 psi)

    • Yielding stress 207 MPa (304 SS)

    • Max stress from FEA 190 MPa


Goals (2)

  • Design a single LNG Tank to fit Liebherr’s current T 264 Mining Truck

    Designed a tank that fits and has an approximate volume of 1800 L

  • Maximize Volume for 8-12 hour operational time (35% work load)

    Total of 3500 L = 11-12 hour of operation time

  • Strictly follow pressure vessel and LNG standard regulations

    NFPA 57 SAE J2343

  • Perform a Finite Elemental Analysis of the tank using SolidWorks

    Max stress < yielding stress for 304 stainless steel (207 Mpa)


QUESTIONS?


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