Presentation on theme: "HazMat/WMD Introduction This module provides information about the types of highway cargo tanks and tube trailers along with their configurations and safety."— Presentation transcript:
4Enabling Learning Objectives HazMat/WMDEnabling Learning Objectives18-2 Identify the capacity (by weight andvolume) of each of the above tanks/trailers,using the DOT specification plate.18-3 Identify the basic design and constructionfeatures of each, and what each carries18-4 Identify the closures found on each,including their names and functions.
5Enabling Learning Objectives HazMat/WMDEnabling Learning Objectives18-5 Identify the required tank identification andother markings.18-6 Identify the location and use of the mechanical,hydraulic, and air emergency remote shut-offdevices found on MC 306/D0T 406, MC 307/DOT407, MC 312/D0T 412, MC 331, and MC 338cargo tanks.18-7 Given a HazMat/WMD highway incident,demonstrate the methods for controlling releasesfrom cargo tanks.
6Definition of a Cargo Tank HazMat/WMDDefinition of a Cargo TankTank intended to carry liquids or gasesFittings, closures, reinforcementPart of motor vehicle duringtransportation, loading and unloadingNot a cylinder orportable tank
7Spec / Non-Spec Code of Federal Regulations Title 49 HazMat/WMDSpec / Non-SpecCode of Federal Regulations Title 49Bureau of Explosives 6000Non-specs may resemble spec tanksAlmost all HazMat must be carried inspecification containers
8Post August 31, 1995, DOT Specifications HazMat/WMDCargo TankMC vs. DOTMC DOT 406MC DOT 407MC DOT 412MC 331MC 338Post August 31, 1995, DOT Specifications
9DOT 400 vs. MC 300 Thicker shells Reinforced rollover protection HazMat/WMDDOT 400 vs. MC 300Thicker shellsReinforced rollover protectionManhole pressure capacitySelf-reclosing fittings
10HazMat/WMDDOT Specs MC300/DOT400Construction Material-A bulk liquid cargo tank may be:Aluminum alloyMild steelStainless steelCarbon steelCarbon steel with a linerContainer must meet CFR 49 standards
11Structural Components HazMat/WMDStructural ComponentsCircumferential reinforcement-A cargo tank may or may not have a frame.Normally shells serve as trailer frameLess than 3/8” require reinforcementBulk head - single and doubleBaffle - side drainsRing stiffenersMaximum unreinforced span ”Incompatible may not be hauled in same tank
16Protection Against Damage HazMat/WMDProtection Against DamageCargo tanks hauling HazMat also must provide protection against accidental damage:Mounting padsRollover protectionPressure venting featuresProtection of bottom outletsBumper protects rear mountings
22Emergency Devices 70% strength of piping HazMat/WMDEmergency Devices Sheer protection70% strength of pipingFusible / frangible devices oF MAXRollover protectionInternal valvesRemote Emergency Closing Actuator
23Emergency Discharge Control HazMat/WMDEmergency Discharge Control Remote Closing Activator- The location of the Emergency Remote Shut off will vary from one DOT spec cargo tank to another, if required.Under normal conditions, the valves operate either:MechanicallyHydraulicallyPneumatically
24Mechanical Emergency Shut-off HazMat/WMDMechanical Emergency Shut-offA clamping nutand fusiblebushing (<250oF), attacheach cable to itshandleTwo Trip lever –One on left sideOne at control
26Pneumatic Emergency Shut-off HazMat/WMDPneumatic Emergency Shut-offEmergency valvesoperate essentiallylike hydraulic valvesonly with airA remotely locatedfusible and frangibleplugThe fusible part ofthe operates (<250oF)
27Tank Pressure Requirements HazMat/WMDTank Pressure RequirementsMAWP - Maximum Allowable Working PressureService or design pressureExternal design pressureTest pressure to 2 times serviceValves and vents
28Specification Plate Vehicle manufacturer Vehicle Serial Number HazMat/WMDSpecification PlateVehicle manufacturerVehicle Serial NumberLining material (if any)Date of manufactureCertification dateDesign service temp.Test pressureMaximum weight of ladingDesign weight of lading
29MC 306 Transports petroleum Capacities up to 10,000 gallons. HazMat/WMDMC 306Transports petroleumCapacities up to10,000 gallons.Oval Cross-sectionFull-length rolloverprotectionMan ways and domelids - most commonleak is in the dome lid.
30MC 306 Some made of carbon steel Most made of .25- inch thick HazMat/WMDMC 306Some made ofcarbon steelMost made of .25-inch thickaluminum alloy.One to eightcompartmentsMost common fourto five
31MC 306 Low pressure vessel MAWP is 3 psig. Internal emergency HazMat/WMDMC 306Low pressure vesselMAWP is 3 psig.Internal emergencyshut-off valvesusually mechanical/pneumaticDriver's side at thefront of the tankControl handle atvalve
32MC 306 Vents Pressure-activated vent vacuum to 1 psig HazMat/WMDMC 306 VentsPressure-activatedvent vacuum to 1 psigand pressure to 3 psigFusible element<250°F or lessinstalled insufficient tovent 6,000 cubic feetof vapor at 5 psig."Scully" or overfillprotection failsPush vent
33DOT 406 Oval in cross-section. Thicker shell and head add from 300 to HazMat/WMDDOT 406Oval in cross-section.Thicker shell andhead add from 300 to400 poundsTank pressure MAWPmin psig andmax. 4 psigRelief valve pressuresettings- 125%MAWP or 3.3 psig
34DOT 406 Vacuum relief device opens at no more than 6 ounces vacuum HazMat/WMDDOT 406Vacuum relief deviceopens at no morethan 6 ounces vacuumand limit vacuum to 1psig.Manhole-assemblyaffects integrity, astatic internal fluidpressure greater thanthe tank's testpressure or 36 psig.May not have a fusiblevent.
35MC306/DOT 406-Never Try To Lift HazMat/WMDMC306/DOT 406-Never Try To LiftGround and bond, drill ,Stinger, off loadControl leaks from dome lidsVapor suppression
38MC307 Workhorse of chemical industry Usually stainless steel HazMat/WMDMC307Workhorse of chemicalindustryUsually stainless steelCap. 5,000 to 7,000 gal.Round cross-sectionInsulated or non-insulated1 to 4 compartments1 to 2 commonLeaks commonly occur-manway and safetyrelief device.
39MC307 Structural Features HazMat/WMDMC307 Structural FeaturesExternal ring stiffeners and in multi-compartmenttanks, bulkheads provide reinforcement Internal baffles rarely are usedRollover protection twice the weight of the loadedtank and a horizontal load of half the weight of theloaded tank. An insulated will have 5" of fiber glass held withstainless steel panels. Coils are connected to the tractor's cooling system
40MC307 Tank pressure MAWP a min. 25 psig. Working pressure over 50 psig HazMat/WMDMC307Tank pressureMAWP a min. 25psig.Working pressureover 50 psigTank must meet requirements of the American Society of Mechanical Engineers .
41MC307-Loading and Un-loading HazMat/WMDMC307-Loading and Un-loadingLoaded through themanway or bottominternal valvesLoad or unload from rearof the tankCenter un-loaders (bellyunloading, tanks withmultiple compartments)Single shot MC 307 tanks
42MC307-Valves and Vents Internal emergency shut-off valves - self- HazMat/WMDMC307-Valves and VentsInternal emergencyshut-off valves - self-closing internalemergency shut-offvalve.Safety relief valvesSpring-loaded,pressure-activatedvents
43DOT407 Thicker shell and head Adds approx. 800 lbs. to an HazMat/WMDDOT407Thicker shell and headAdds approx. 800 lbs. to anaverage 5,000-7,000 gallon,aluminum alloy tank. Requires increased overturnprotection May be designed for vacuumservice (vacuum loading). Vacuum service must meetminimum external designpressure standards.
44DOT407-Tank Pressure Minimum MAWP (25 psig) ASME apply to any HazMat/WMDDOT407-Tank PressureMinimum MAWP (25psig)ASME apply to anywith a minimuminternal MAWP over35 psig (15 psig lowerthan for the MC 307)Loaded by vacuumminimum externaldesign pressure mustbe 15 psig.
45DOT407- Safety Relief Devices HazMat/WMDDOT407- Safety Relief DevicesPrimary pressure relief one or more reclosing pressure-relief valves.Can use a non-reclosing pressure relief device ONLY aspart of a series which includes a reclosing pressure reliefdeviceA frangible disc only between product and telltale indicatorPrimary relief valve must be at least 120% of the MAWPand not over 132% of the MAWP.Secondary relief valve must be at least 120% of the MAWP.Manholes- must withstand the greater of 40 psig or thetank's test pressure
46MC312 Primarily transport corrosive products acids HazMat/WMDMC312Primarily transportcorrosive products acidsand bases (caustics).Made of:Mild steelHigh strength low alloysteelStainless steelSteel with a lining Average capacity of3,000 to 5,000 gallons.
47MC312 Structural Features HazMat/WMDRound cross-sectionCommonly single-compartmentOne to four compartmentsEach have own manway.Use external ringstiffeners asreinforcementInsulated or non-insulatedMay be lined or unlinedUsually are clean bore,for easier cleaningMC312 Structural Features
48MC312 Structural Features HazMat/WMDSmaller diameter, (greaterspecific gravity ofproducts)Usually top service.Bottom outlets are notcommon.Protective coating onmanway, valveassemblies and tankLeaks common aroundthe manway and bottomsump.MC312 Structural Features
49MC312 Structural Features HazMat/WMDMC312 Structural FeaturesLiningsLeaks migrateBonded linings10 years servicePressure ratingsdetermined by productunloading, over 15 psiASME must certify
50MC312 Unloading either top or bottom HazMat/WMDMC312Unloading either top or bottomEach outlet at or near the top of the tankmust have an external shut-off valve asclose to the tank as possible.Top of the tank, an eduction line extends(sump) shut-off valve is at the top of thetank.For pressure unloading from the bottom, aninternal emergency shut-off valve must beinstalled in the bottom outlet.
51MC312 Remote closures must be 10 feet away HazMat/WMDMC312Remote closures must be 10 feet awayBlind flange, sealing cap, or shut-off valve atend of the outlet.Safety venting devices must activate at apressures not over 150% of design pressurePressure unloading, the relief valve limit thetank pressure to 130% of valve's designpressure for maximum air flow [Sec.(a)].
52DOT412 The minimum internal MAWP not designed HazMat/WMDDOT412The minimum internal MAWP not designedto be loaded by vacuum pressure is 5 psig.Loaded by vacuum press. min. of 25 psiginternal and external press. min. of 15 psig.External design pressure of 15 psig or moremust be circular in cross-sectionSome may be oval.Pressure reliefs on DOT 412s are like thoseon the DOT 407 [Sec (1)].
53Multi-purpose Cargo Tanks HazMat/WMDMulti-purpose Cargo TanksThe vents and reliefs that require changingmust be stamped with the appropriate MCspecification number and color-coded:MC 306 redMC 307 greenMC 312 yellowNon-specification-blueMultipurpose cargo tanks are not commonand the 400 series prohibits them.
54MC331 Rounded ends 8,000 - 11,500 gallons Normally one compartment HazMat/WMDMC331Rounded ends8, ,500 gallonsNormally one compartmentLiquefied compressed gasSteel or aluminum may beinsulatedASME-MAWP psigUpper two-thirds of tankpainted white or of areflective material
55MC331 Valves protected Openings must be plugged, capped, or bolted HazMat/WMDMC331Valves protectedOpenings must be plugged, capped, or boltedflangeProtected with an excess flow valve onproduct discharge openings or backflow checkvalve on product inlet openingsFitted with an internal self-closing stop valveEach Cargo Tank inlet and outlet must bemarked liquid or vapor when the tank isfilled
56MC 331 Safety Devices <3,500 gallons, at least one emergency HazMat/WMDMC 331 Safety Devices<3,500 gallons, at least one emergencydischarge control (remote closing activator)> 3,500 gallons two emergency dischargecontrols (remote closing activators)Excess flow valves must closeautomatically backflow check permit flowonly in one direction.Safety relief pressure discharge 110%not to exceed 120%
57MC331-Markings Stenciled with the proper shipping name must HazMat/WMDMC331-MarkingsStenciled with the proper shipping name mustappear on the sides and ends of the tank.QT (Quenched & Tempered) or NQT (Not Quenchedand Tempered)QT or NQT appears above or next to thespecification plate."NQT" are authorized for all grades of anhydrous ammonia."QT" are authorized for anhydrous ammonia having a minimum watercontent of 0.2% by weight.NQT steel are authorized to carry all grades of LPGQT steel can carry only grades of LPG that are determined"noncorrosive"
58MC338 8,000 - 10,000 Gallons Pressures 25.3 psi - 500 psi HazMat/WMDMC3388, ,000 GallonsPressures 25.3 psi psiDesign Service TemperatureLeft front pressure gauge,rear viewCryogenics under -130oFBoiling TempVacuum and InsulatedEmergency controls sameas MC331Thermal closure at a temp.not over 250oF
59HazMat/WMDNon-spec CryogenicCarry atmospheric gases (oxygen, nitrogen, and helium)Don't have all the safety features of an MC 338.Bleed off excess pressure during transportSpecial regulation for carrying a cryogenic flammable liquid-No carrier may operate and no driver may drive a motor vehicle transporting a flammable cryogenic liquid in a package exceeding 125 gallons unless written instructions accompany the package.The instructions must contain with required shipping papers:General precautionsManual venting instructionsEmergency proceduresThe names and telephone numbers of contact in an emergency.
60Specification Plate MC338 HazMat/WMDSpecification Plate MC338Vehicle manufacturerVehicle Serial NumberLining material (if any)Date of manufactureCertification dateDesign service temperatureInsulation for Oxygen Service or Not Authorized for OxygenServiceMaximum weight of ladingMarked holding timeDesign weight of ladingMC 338s carrying flammable cryogenic liquids must be marked on the right side, in letters at least two inches high, as follows:ONE-WAY TRAVEL TIME:_________HRS with the blank filled in with the number of hours.
63Dry Bulk Materials Transport dry bulk materials Manufactured Valves Aluminum and mild steelOperates on pressure upto 15 psiBlower may be located ontrailerMay be gravity unloadedValvesBack flow valvesBlow down valve
64Tube Trailer – Non Spec Trailer Each cylinder is a separate DOT spec. cylinderManifolded togetherCompressed gases only2500 psi and higherVenting must be unobstructed and not impinge on other containers
66Conclusion Participants were given information to provide the HazMat/WMDConclusionParticipants were given information to provide theability to:Identify and describe the hazards associated with:MC 306/DOT 406 and MC 307/DOT 407 cargo tanksMC 312/DOT 412 cargo tanksMC 331 cargo tanks and MC 338 cargo tanksNon-specificationAsphaltDry bulk cargo tanksTube trailersDemonstrate how each of the above differs and how to respond using control measures, valve operation and safety systems.