Taylor-Wharton MicroBulk MB-450 Installation And Operation Manual
MB - 450
Installation and Operation Manual
Do not attempt to use or maintain these units until you read and understand these instructions. Refer
to the Taylor Wharton’s “Safety First” booklet (TW - 202) for handling cryogenic material. Do not permit
untrained persons to use or maintain this equipment. If you do not understand these instructions, contact
your supplier for additional information. www.taylorwharton.com
MicroBulk
BT- 434 REV.A
BT- 434 Rev.A
2
WARNING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Safety Precautions for Liquid Oxygen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Safety Precautions for Liquid Nitrogen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
System Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Specication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
PIPING CIRCUITS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
P&ID: MB-450 Standard Conguration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Fill and Vent Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Express Fill Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Pressure Building Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Gas Withdrawal Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Economizer Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Safety Devices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Instrumentation Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Receiving Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Customer Installed Equipment/Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Filling by Pressure Transfer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Filling by Pump Transfer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Filling for Road Transport. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Withdrawing Gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Withdrawing Liquid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Changing Gas Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
MAINTENANCE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Leak Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Globe Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Instruments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Checking Vacuum. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Trouble-Remedy Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
APPENDIXES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Appendix 1 – MB - 450 General Arrangement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
TABLE OF CONTENTS
BT- 434 Rev.A
3
WARNING
The following safety precautions are for your protection. Before installing, operating, or maintaining this unit read and follow all safety precautions in this section and in the reference publications.
Failure to observe all safety precautions can result in property damage, personal injury, or possibly
death. It is the responsibility of the purchaser of this equipment to adequately warn the user of
the precautions and safe practices for the use of this equipment and the cryogenic uid stored in it.
CAUTION: When installing eld-fabricated piping, it is recommended to make certain a suitable safe-
ty valve is installed in each section of piping between shut-o valves.
For more detailed information concerning safety precautions and safe practices to be observed
when handling cryogenic liquids consult CGA pamphlet P-12 “Handling Cryogenic Liquids” avail-
able from the Compressed Gas Association, 1235 Jeerson Davis Highway, Arlington, VA 22202.
Safety Precautions for Liquid Oxygen
Oxygen is a colorless, odorless, and tasteless gas that can be condensed into a liquid at the low
temperature of 297 degrees below zero Fahrenheit (-183�C) under normal atmospheric pressure. Approximately one-fth of normal air is oxygen. As a liquid, oxygen is pale blue in color. Oxygen is non-ammable; however it vigorously accelerates the burning of combustible materials.
Keep Combustibles Away from oxygen and eliminate ignition sources. Many substances that do not normally burn in air require only a slight spark or
moderate heat to set them aame in the presence of concentrated oxygen. Other sub stances, which are only moderately combustible in air, can burn violently
when a high percentage of oxygen is present.
Do not permit smoking or open ame in any area where liquid oxygen is stored,
handled, or used. Keep all organic materials and other ammable substances
away from possible contact with liquid oxygen. Some of the materials that can
react violently with oxygen are oil, grease, kerosene, cloth, wood, paint, tar, and
dirt that contains oil or grease. Under certain conditions ammable materials that
have become permeated with liquid oxygen are impact sensitive and can detonate
if subjected to shock.
Keep Area and Exterior Surfaces Clean to Prevent Ignition
As normal industrial soot and dirt can constitute a combustion hazard, all equipment surfaces must be kept very clean. Do not place oxygen equipment on asphalt surfaces, or allow grease or oil deposits to remain on benches or concrete
surfaces in the vicinity of the oxygen equipment. Use cleaning agents, which will
not leave organic deposits, on the cleaned surfaces. Equipment to be used in contact with liquid oxygen should be handled only with clean gloves or hands washed
clean of oil.
Maintain Adequate Ventilation
Enclosed areas containing oxygen equipment should be ventilated to prevent accumulations of oxygen and thereby minimize combustion hazards.
BT- 434 Rev.A
4
WARNING
Extreme Cold - Cover Eyes and Exposed Skin
Accidental contact of liquid oxygen or cold issuing gas with the skin or eyes may
cause a freezing injury similar to frostbite. Handle the liquid so that it won’t
splash or spill. Protect your eyes and cover the skin where the possibility of
contact with the liquid, cold pipes and equipment, or the cold gas exists. Safe-
ty goggles or a face shield should be worn if liquid ejection or splashing may
occur or cold gas may issue forcefully from equipment. Clean, insulated gloves
that can be easily removed and long sleeves are recommended for arm protec-
tion. Cuess trousers should be worn outside boots or over the shoes to shed
spilled liquid. If clothing should be splashed with liquid oxygen or otherwise
saturated with the gas, air out the clothing immediately, removing it if possible.
Such clothing will be highly ammable and easily ignited while the concentrated oxygen remains, and should not be considered safe for at least 30 minutes.
Replacement Parts Must be Suitable for Oxygen Service
Many materials, especially some non-metallic gaskets and seals, constitute a
combustion hazard when in oxygen service, although they may be acceptable for
use with other cryogenic liquids. Make no substitutions for recommended spare
parts. Also, be sure all replacement parts are thoroughly “Cleaned For Oxygen
Service” in accordance with Compressed Gas Association (CGA) Pamphlet G-4.1
“Cleaning for Oxygen Service” or equivalent industrial cleaning specications.
Observe Safety Codes When Locating Oxygen Equipment
Before locating oxygen equipment, become thoroughly familiar with National
Fire Protection Association (NFPA) Standard No. 50, “Bulk Oxygen Systems”,
and with all federal, state and local safety codes. The NFPA Standard covers
the general principles recommended for the installation of bulk oxygen systems on industrial and institutional consumer premises.
Safety Precautions for Liquid Nitrogen
Extreme Cold - Cover Eyes and Exposed Skin
Accidental contact of liquid nitrogen or cold issuing gas with the skin or eyes
may cause a freezing injury similar to frostbite. Handle the liquid so that it won’t
splash or spill. Protect your eyes and cover the skin where the possibility of contact with the liquid, cold pipes and equipment, or the cold gas exists. Safety goggles or a face shield should be worn if liquid ejection or splashing can occur or
cold gas can issue forcefully from equipment. Insulated gloves that can be easily
removed and long sleeves are recommended for arm protection. Trousers with-
out cus should be worn outside boots or over the shoes to shed spilled liquid.
Nitrogen is an inert, colorless, odorless, and tasteless gas making up four-fths of the air you
breathe. Liquid nitrogen is obtained by cooling air until it becomes a liquid and then removing
the oxygen. Air is roughly one-fth oxygen. Liquid nitrogen is at a temperature of -320�F (-196�C)
under normal atmospheric pressure.
BT- 434 Rev.A
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WARNING
Keep Equipment Area Well Ventilated
Although nitrogen is non-toxic and non-ammable, it can cause asphyxiation in
a conned area without adequate ventilation. Any atmosphere not containing
enough oxygen for breathing can cause dizziness, unconsciousness, or even death.
Nitrogen, a colorless, odorless, and tasteless gas, cannot be detected by the human
senses and will be inhaled normally. Without adequate ventilation, the expanding
nitrogen will displace the normal air resulting in a non-life-supporting atmosphere.
Dispose of Waste Liquid Nitrogen Safely
Dispose of waste liquid nitrogen out-of-doors where its cold temperature cannot
damage oors or driveways and where it will evaporate rapidly. An outdoor pit
lled with clean sand or gravel will evaporate liquid nitrogen safely and quickly.
NOTE: Argon is an inert gas whose physical properties are very similar to those of
nitrogen. For handling of liquid argon, follow the safe practices described for the
handling and use of liquid nitrogen.
BT- 434 Rev.A
6
INTRODUCTION
This manual provides information for the operation and maintenance of Taylor-Wharton’s line of MB-
450 cryogenic gas supply systems. These products store cryogenic liquid and dispense it as a warm
pressurized gas. The MB-450 is designed for applications requiring nitrogen, argon, or oxygen gas.
These products are ideal for on-site lling with Taylor-Wharton’s Express cryogenic liquid delivery ve-
hicle.
Additional product specications, ow diagram, views, and important dimensions are shown on the
general arrangement drawing provided in the appendix of this manual.
System Description
The MB-450 consists of a cryogenic liquid vessel, piping, internal vaporizer, and an internal pressure
builder.
The system vessel has an approximate gross capacity of 450 liters. The vessel consists of a pressure
vessel suspended inside a jacket. The space between the pressure vessel and the jacket is evacuated
and insulated with a micro-berglass / aluminum foil radiation shield. Both the inner pressure vessel
and vacuum jacket are constructed of type 304 stainless steel. Models are available designed and constructed in accordance with DOT-4L or ASME Section VIII. The DOT-4L vessels may be legally transport-
ed by truck in the United States while containing product.
Piping circuits allow the vessel to vent, ll, pressurize, and provide pressurized gas. Piping is type-304
stainless steel. Valves are brass. Fittings are machined from forged brass.
Instrumentation consists of a pressure gauge and a dierential pressure gauge. The pressure gauge
allows the vessel pressure to be monitored. Accurate measurement of the vessel contents is provided
by the dierential pressure gauge. The dierential pressure gauge instrument lines are constructed of
copper tube.
The MB-450 automatically maintains pressure by vaporizing cryogenic liquid in a controlled fashion. All
energy for building pressure and vaporizing liquid is provided by heat from ambient air. The vaporizer
and pressure builder coils are attached to the inside surface of the outer jacket.
BT- 434 Rev.A
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Specication
Model EF-450-DOT EF-450HP DOT EF-450VHP DOT
Part Number M4500C12-EZ H4500C12-EZ V4500C12-EZ
Dimensions
Footprint inch 31 x 31 31 x 31 31 x 31
(mm) 787 x 787 787 x 787 787 x 787
Cylinder Diameter inch 30 30 30
(mm) 762 762 762
Height inch 74 74 74
(mm) 1,880 1,880 1,880
Empty Weight Ibs 640 730 885
(Kg) 290 331 401
Capacity, Gross gallons 118 117 115
(liters) 448 443 437
MAWP psig 250 350 500
(kPa) 1,724 2,413 3,448
Design Specication DOT 4L
Safety Devices
Pressure Relief Valve psig 250 250 250
(kPa) 1,724 1,724 1,724
Inner Container Bursting Disc psig 356 525 750
(kPa) 2,455 3,620 5,171
Road Relief Valve psig 22 22 22
(kPa) 152 152 152
Pressure Control Devices
Economizer Setting psig 200 325 420
(kPa) 1,379 2,241 2,896
Pressure Building Setting psig 175 300 400
(kPa) 1,207 2,069 2,758
Gaseous Capacity NPT
1
Nitrogen cu. ft. 9,250 8,750 7,687
(cu. M) 262 248 218
Oxygen cu. ft. 11,400 11,000 10,208
(cu. M) 323 312 289
Argon cu. ft. 11,000 10,700 9,947
(cu. M) 312 303 282
Weight of Contents
1
Nitrogen lbs 670 634 557
(kg) 304 288 253
Oxygen lbs 946 907 845
(kg) 429 411 383
Argon lbs 1,134 1,102 1,028
(kg) 514 500 466
Gas Delivery Rate c 450 450 450
(cu. M/h) 12.7 12.7 12.7
NER (Percent of capacity per day O2) 1.0%
1
Based on liquid at full trycock for ASME designs and maximum liquid weight for DOT designs.
BT- 434 Rev.A
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PIPING CIRCUITS
The following paragraphs describe the operation of the piping circuits of the system. The descriptions
refer to the main components of each circuit and are grouped by function. Reference the piping schematic below and in the general arrangement drawing for the component designations. These component and circuit descriptions should be understood before attempting operation.
P&ID: MB-450 Standard Conguration
Figure 1-System Piping Schematic
VC-1
C
V-1
F
V-1
V-5
-
V-3
-
LI-1
PI-1
-
R-2
V-2
SV-1
SV-2
PBC-1
PCV-1
CN-2
CN-1
-
-
Legend
CN-1 Connection, Liquid Fill / Withdrawal LI-1 Liquid Level Gauge
CN-2 Connection, Full Trycock & Vent PI-1 Pressure Gauge
CN-3 Connection, Pump / Top Fill PBC-1 Pressure Building Coil
CN-4 Connection, Gas Withdrawal VC-1 Vaporizer Coil
V-1 Valve, Liquid Fill / Withdrawal PCV-1 Pressure Building Regulator
V-2 Valve, Full Trycock / Vent SV-1 Safety Valve
V-3 Valve, Gas Withdrawal SV-2 * Safety Valve, 22 psig
V-4 Valve, Pressure Building R-1 Safety Disc
V-5 * Valve, Isolation R-2 Outer Casing Safety Disc
CV-1 Pump / Top Fill Check Valve FSV-1 Fill Stop Valve
Notes:
* Featured on DOT models only.
BT- 434 Rev.A
9
Fill and Vent Circuits
The liquid valve (V-1) communicates with the bottom of the vessel. A stainless steel tag labeled “LIQUID” identies the valve and the liquid connection (CN-1). Liquid is added or removed from the vessel
through this connection and valve.
The vent / trycock valve (V-2) is attached to a vertical tube in the upper portion of the vessel. The open
end of the tube is positioned at 90% liquid level based on the vessel volume. Opening the vent valve
reduces pressure in the vessel during lling. It also severs as a “full trycock”, venting liquid from the
vessel when the liquid level exceeds 90%. A tag labeled “VENT” is attached to this valve.
Fill and Vent Circuits
Figure 2-Fill and vent circuits highlighted in blue.
V-1
V-2
CN-2
CN-1
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