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ABD00204678
--vcM-eas monitoring -SYSTEM-
ABERDEEN CHEMICAL PLANT ___ _ IARCX1 0, 1905-
Work By:
Frank G. Jeanson Process Engineer
Reviewed By:
k > j Vernon L. Thornhill Senior Process Engineer
Approved By:
R. A. Frohreich Chief Process Engineer
ABD00204679
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-------- VCM TftNV-FftRETAREA ABERDEEN CHEMICAL PLANT
Table of Contents I. Purpose of Design II. Process Description III. Equipment and Instrument Specifications IV. Process Piping Schedule V. Work List VI. P&I Diagram
ABD00204680
VCM GAS MONITORING SYSTEM RAILCAR UNLOADING AREA ABERDEEN CHEMICAL PLANT
-r
Purpose of Design
.
J. / /
The purpose of/this design Is to provide the VCM eeileeg uploading1 area with ap/additional gas monitoring system to detect serious VCM releases; ^Presently, there are six fixed point monitor locations that are tied into one of the plant's Honeywell GC's. These monitor locations are listed below:
1. Sphere (grade level). 2. Compressor shed (grade level). 3. Between railcar unloading stations number 1 and 6
(Top of railcar level). A. Between railcar unloading stations number 2 and 7
(Top of railcar level) 5. Between railcar unloading stations number 3 and 8
(Top of railcar level) 6. Between railcar unloading stations number A and 9
(Top of railcar level).
These existing monitors do not provide immediate response and are not distributed throughout the entire VCM tank farm area.4 iHnrt,/ince_thlGare^Ls not monitored by plant personnel the majority of the time and since it-haaythe potential for a serious release* additional protec tion is needed>^^y
In addition to the gas monitoring system, this design will provide a pressurization blower for the fire pump houses near the VCM tank farm. The purpose of this blower is to prevent VCM from entering the build ings in the event of a serious VCM leak.
This design will also provide for Item 8A-6 of the Underwriter's In surance Company recommendations. This item recommended installing vapor detectors for the sphere's VCM transfer pumps to the old and
new module.
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ABD00204681
VIM UAb MOWITORIHQ -9T5TEM VCM TANK FARMJZ
ABERDEEN CHEMICAL PLANT
II. Process Description
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"rhis design will provide forlthe installation of ten VCM gas sen
sors, AT-101 through-AT-14-0V in the VCM tank farm area (see P&I dia gram for locations). These sensors will be tied into dual channel combustible gas monitors, AI-121 through 125*/^Each monitor will accept signals from two sensors and display the higher of the two readings. The monitors will indicate the percent of the lower ex plosive limit (LEL) of VCM gas in the air. The monitors will be tied into alarms in the vinyl control room. The first alarm will be set at 25% LEL and the second alarm will be set at 45% LEL.
Should any of the monitors indicate a low level (25% LEL) of VCM gas in the air, the panel operator will notify the yard operator of the situation. If the monitors indicate a high level (45% LEL) of VCM gas in the air, the panel operator will then notify the yard operator to shut down any transfer or unloading equipment that is being used. When this equipment is off, the panel operator will Isolate the sphere by pushing the sphere control valve override switch. This switch will close the following valves:
(1) The valve on the vapor line to/from the compressors.
(2) The valve on the liquid line from the compressors.
(3) The valve on the liquid line to the VCM transfer pumps.
(4) The valve on the liquid recirculation line from the VCM transfer pumps.
The monitors will be equipped with relay connections to tie into the existing sphere isolation control valve override switch. However, the relay connection will not be tied into this switch until the REMOTE OPERATING VALVES project is installed. When this project is installed, additional equipment and valves will be shut off by the sphere isolation control valve override switch. This includes:
(1) The valve on the liquid return line from the VCM vapor line knockout po.
(2) The five VCM compressors in the VCM tank farm.
(3) The two VCM transf^iL pumps. ; d-J
After installation cf (this project, the relay connections from the gas monitors will be Qred) into the sphere control valve override switch. Should the monitors indicate a high level (45% LEL) of VCM gas in the air, the sphere control valve override switch will automatically shut off all the valves ahd equipment mentioned above. When the isolation switch is used, it will override the motor con trols and shut down the units should they be in service.
ABD00204682
VCM GAS MONITORING SYSTEM VCM TANK FARM AREA
ABERDEEN CHEMICAL PLANT
II# Process Description - Continued
/} l/CA\ lff^addition to tne vapor monitors, a pressurization blower, F-150, will be installed for the fire pump houses. This blower will pro vide air to pressurize fire pump houses #1, #2, #3, and #4. Pressurizing the fire pump houses will prevent any VCM from entering the buildings in the event of a serious VCM leak.
The blower's controls will be tied into the 25% LEL alarm in the con trol room so that when this alarm goes off, the blower starts. The blower was sized to maintain a 0.25 inch of water pressure in the buildings while providing enough air to the diesel engines for combustion. This blower will be equipped with an extended inlet stack to provide VCM free air in the event of a serious release.
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ABD00204683
VCM GAS MONITORING SYSTEM VCM TANK FARM AREA
ABERDEEN CHEMICAL PLANT
III. Equipment and Instrument Specifications
Item No.
Description
AI-121 AI-122 AI-1^3-- ^AI-124 . /9^-/Z3
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VCM transfer pumps gas monitor South unloading stations gas raointor -M-iddle-unloarfIng srarfoas gas monitor North unloading stations gas monitor Compressor shed gas monitor
AT-101 AT-102 AT-103 AT-104
- AT 105 '
Gas sensor north of VCM transfer pumps
Gas sensor east of_. actuated valves
Gas sensor -sou-tit of unloading stations
Gas sensor beCUguft- ffl an^- //6 unloading
stations
P
&ao sensor between ill aud //7`UriToadding
-AT 10 kT-Vfr ,0-1
---Gas sensor between //3 and #8 unloftrhhTg--stations-Gas sensor batwo&p M and //9 unloading stations Gas sensor noi1 eh^f unloading stations Gas sensor flSg'tlff of compressor shed Gas sensor-north
F-150
Fire pump house pressurization blower
HS-130
Handswitch for F-150
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ABD00204686
.fT-
ERAL MONITORS, IN
3037 ENTERPRISE STREET COSTA MESA, CALIFORNIA 92626 PHONE: (714) 540-4895 TWX 678-372
Mr. Frank Jenson
Oate. 30 January 1985
Vista Polymers Box 91
GMI QUOTATION NO: 6ll
Aberdeen, MS
Please Reference GMI Quote No. Your Reference: verbal request of 30 January 1985.On All Correspondence.
ITEM
DESCRIPTION
QUANTITY
UNIT PRICE
EXT. PRICE
1. Model 580 System to include one Dual Channel Monitor, 2 ea Sensor P/N 10001-1, 2 ea Sensor Housing P/N 10007 and 1 ea Instruction Manual. Standard Relay Configuration. `Common Alarm Relays
6 ea
la. Alternate System
Model 610 System to include one Four Channel Monitor, 4 ea Sensor P/N 10001-1, 4 ea Sensor Housing P/N 10007 and 1 ea Instruction Manual. Standard Relay Configuration. `Common alarm relays for all Four Channels. Common alarm set point adjustment.
3 ea
Note: For a discrete set of alarm relays (Malfunction Low and High) for each channel plus discrete alarm set point adjustment add $470.00 to unit price of item #1A.
lb. Alternate System
Model 4800 system to include one 16 Channel Monitor, 1 ea Extender Card for Channel Card and one for relay card and one Instruction Manual. Blank Panels included at N/C for inactive channels. Each active channel to include one each channel control card. Relay
Quotation Firm For: F.O.B. Terms: Net 30 Days Delivery: Enclosures:
^ ARO Warranty:
$1,764.00 $10,584.00 $2,973.00 $ 8,919.00
Sianature: Name/Title _
_____
___ Sheet No j _Qf 0
Sheets
______
Local RepresentativePhone
Address
.
GMl/9-84
3037 ENTERPRISE STREET COSTA MESA, CALIFORNIA 92620 PHONE: (714) 5404895 TWX 678-372
TO: Mr. Frank Jenson Vista polymers
Box 91 Aberdeen, MS
Your Reference: Verbal request of 30 January 1985
ITEM
DESCRIPTION
Date: 30 January 1985 GMI QUOTATION NO:___ ^2,
QUANTITY
Please Reference GMI Quote No. On All Correspondence.
UNIT PRICE
EXT. PRICE
Card, Sensor P/N 10001-1 and Sensor Housing P/N 10007.
11 active channels 12 H
13 ,,
If
14 ,,
If
15 ,, 16 ,,
If II
1 ea 1 ea 1 ea 1 ea 1 ea 1 ea
Standard Relay Configur* tion*
Note: The Standard Relay Configuration is
Malfunction. SPDT, non-latchinq, enerqized *4 Low Alarm . DPDT, non-latchinq, de-enerqized. *4 Hiqh Alarm. DPDT, latchinq, de-enerqized.
other relay options (Latching and energized) are available.
**Model 4800 Low & High alarm Relays are SPDT. I or DPDT add $22.00 for each active channel in Item #lb.
$11,784.00 $11,784.00 $12,597.00 $12,597.00 $13,410.00 $13,410.00 $14,223.00 $14,223.00 $15,036.00 $15,036.00 $15,849.00 $15,849.00
Quotation Firm For: 60 Davs F.O.B. Costa Mesa, CA 92626 Terms: Net 30 Days Delivery: 4 to 6 weeks
Enclosures: product Cataloa
ARO Warranty: 2 years
Signature:., Name/Title.
Ken Kaub
Local Representative__ Address
__ _
.Sheet No..
.Of
Sheets
Phono
GMl/9-84
GENERAL MONITORS
Description
General Monitors' Model 580 is a compact, highly-versatile system tor contin uously monitoring combustible gas concen trations in two locations. The system consists of two remote sensing assemblies and a solid-state controller.
For safety, reliability, and ease of calibration, sensor outputs are not summed. Each channel is completely independent and has its own constant current sensor drive circuit. Sensors are available to meet various service requirements for most gases.
The Model 580 independently moni tors two locations. The controller automati cally displays the higher reading channel on an analog meter, scaled from 0-100% LEL (Lower Explosive Limit). Manual over ride switching permits readout of the low channel at any time. Low and high alarm set-points are common to both channels. Calibration of each channel is done inde pendently, and an alarm override switch disables the alarms during the calibration mode. A 45 second time delay also disables the alarms on start-up.
Customers may select from a wide variety of relay options, such as normally energized or de-energized high and low alarms, and latching or non-latching high and low alarms. The malfunction relay circuitry is normally energized and monitors both channels.
Features
"Peak Picking" Circuitry Automatically displays highest reading channel
Compact Packaging
Dimensions: 2"W x 7"H x11.5"D (51 mm W x178 mm H x 292 mm D)
Low Power Consumption Analog Meter Standard
Independent 3 AMP/117 VAC DPDT High and Low Alarm Relays 3 AMP/117 VAC SPDT Malfunction Alarm Relay
Variety of Relay Options Normally energized or de-energized high and low alarm Latching or non-latching high and low alarm
Remote Reset
Superior Reliability Two week factory burn-in of system Single PC. board Solid-state circuitry Proven catalytic sensor
Malfunction alarm circuitry Positive contact field terminals Time delay Constant current supply to sensor
u Safe, Easy Calibration Fully accessible calibration adjustments Alarm relays automatically disabled while in calibration mode
Low Cable Costs 40 ohm loop resistance, e g. 3000 ft. (910 meters) one way of #18 AWG cable 7600 ft. (2320 meters) one way of #14 AWG cable
User Protection Two year warranty CSA approved
Applications -- Protection from hazardous combustible gases in:
Fuel Loading Facilities Compressor Stations LNG Processing and Storage Oil Well Logging Sewage Plants l_ Cas Turbine Enclosures 3 Drilling and Production Platforms 3 Solvent Vapors
Sensor Elements
General Monitors' sensors are designed for reliable performance and long life. Each sensor must undergo extensive burn-in and rigid quality control procedures before shipment.
The sensors consist of two catalytic bead elements in a balanced Wheatstone bridge circuit (See Principle of Operation). These low temperature catalytic bead sensing elements require minimal sensor excitation current, greatly increasing sensor lire.
Principle of Operation
A catalytically treated ceramic active bead and a passivated ceramic reference bead form two legs of a Wheatstone bridge circuit. Combustible gases diffuse through a flame arrestor and oxidize on the catalytically treated active bead, causing an increase in its temperature and electrical resistance. This results in an unbalancing of the Wheatstone bridge circuit. T he reference bead, inert to combustible gases, compen sates for ambient temperature, humiditv and pressure changes. The difference in resistance of the active and reference beads is converted into a sensor signal which is amplified in the controller, sent to the indicator and alarm circuits, and displayed on an analog meter. The meter is scaled in percent of the Lower Explosive Limit (% LEL). In the Model 580 the two sensor inputs are continuously compared, the higher signal being displayed on the meter.
Two adjustable electronic alarm circuits may be field-set for any alarm level up to100% LEL. The low alarm signal indicates potentially hazardous gas accumu lations at low concentrations, allowing time for corrective action. The high alarm signal indicates immediate danger. A flashing malfunction LED will indicate low input
power, sensor removal or damage, "CAL" mode, severed cable or current failure. Two LED channel indicators are provided to indicate the higher channel.
A variety of alarm relay options provides contacts for high, low and malfunction alarms to be wired to auxiliary lamps, horns, fans or shut-down equipment.
ABD00204689
Analogoutput meterwith linear scale calibrated in the percent of Lower Explosive Limit (% LELX
Reccaed Toggle Switch Used for normal operation or calibration When in the "CAL" mode high and low alarms are disabled.
Status Indicators HIGH alarm -- Mashing red LED LOW alarm -- flashing amber LED READY (power on)-- steady green LED MALE (malfunction)-- flashing amber LED 'High channel indicators --green LED's Channel select switch -- black button
Calibration Potentiometers HIGH and LOW alarms --set point
adjustments located on circuit board. SPAN and ZERO adjustments for each
channel accessible through front panel
Reset Button Used for manual reset of latching high and low alarm circuits.
Width r (51 mm)
Depth tl.5'(292 mm)
Calibration
By placing the recessed toggle switch on the front panel to the calibration mode, the high and low alarm relays are held in standby condition and the "MALF" LED flashes. Zero and span pots are accessible from the front panel. Calibration is accom plished by adjusting the meter to zero and exposing one of the two sensors to a known concentration calibration gas and adjusting the meter with the span pot to indicate the concentration. The alarm adjustments are located on the side of the controller to prevent tampering.
Relay Options
The versatility of the Model 500 is enhanced bv the availability of different relay operat ing modes for specific user requirements. These relay options include normally energized or de-energized high and low alarms, latching or non-latching high and low alarms and sealed relays.
CSA performance certified to C22.2 No. 152-1976
Controller Specifications
Mounting Options: Rack, panel and wall
Dimensions: 2''W x 7"H x 11 5"D (51 mm W x 17B mm H x 292 mm D)
Weight: 4 lbs (1 80 kg)
Temperature Range: 0F to150F(--18C to -rfafaPC)
Power: 117 VAC 15% (220 VAC 15% optional), 50-60 Hz, 22-30 VDC, 8 watts nominal
Meter Range: 0-100% Lower Explosive Limit (% LEL)
Repeatability: 2% full scale
Linearity: 5% full scale
Alarm Circuits: High, low and malfunction: Standard high and low DPDT 3 AMP/ 117 VAC resistive, malfunction SPDT 3 AMP/117 VAC resistive, high and low normally de-energized, malfunction normally energized.
LED Status Indicators: Flashing red for high alarm, flashing amber for low alarm, green for ready (power on), flashing amber for malfunction, flashing amber for calibration mode, steady green for
each channel indicator.
Electrical Classification: General purpose for mounting in non* hazardous area
Warranty: Two years
Sensor Specifications
Type: Continuous diffusion, low temperature
catalytic bead. Standard Industrial
Hydrocarbon Sensor, High Temperature
Standard Industrial Hydrocarbon Sensor.
Temperature Range:
--65F to +200F(--55C to ~93C); High Temperature Sensor to 400F (200*0
Response Time: Typically 6-second time constant when exposed to 50% LEL of methane gas
Zero Drift: Less than 5% per year
Life: 3 to 4 years, normal service
Electrical Classification: NEC and CSA, Class I. Division 1. Croup B, C and D: VDE 0171 (Ex) sd 3n C5
Warranty: Two years
Cable Length:
Maximum 3 wire cable length allow
able between controller and sensor
assembly with one wav resistance of
20 ohms (total 40 ohms loop)
AWG
FEET
METERS
20 1900
580
18 3000
910
16 4800
1460
14 7600 2320
Represented by:
GENERAL MONITORS, INC.
3037 Enterprise Street Costa Mesa. CA 92525 Tel 71 J| 5*10-1895 Telex 678-372 FAX(7'Ji 557-25'5
April 1982, General Monitors. Inc. RLCGM-85 5M-HP Model and speculations subject to change without notice.
ABD00204690
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ABD00204692
SIZES 125 and 155--BELT DRIVEN
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Size
Wheel
Outlet
die. area sq. ft.
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B
DIMENSIONS [INCHES]
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H
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125 121/4 155 15
.86 1.29
17 17
10 12
12% 151/a
133/4 167/8
7 7/a 93/4
13 15%
10% 123/4
271/2 30
1% 1%
3 3
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155 -?.% 1125 6% 12% 9% 8% 10% % 11% 16% 127%
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12% 9% 8% 10% % 14% 193/4 153/4 H%
1 1
'Discharge dimensions . . . see page 5.
L M N`
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163/4
9% 17 17
Keyway
%x% %X%
Base holes
9/l6 9/l
SIZE 125
Capacities based on air density of .075 lbs. per cu. ft. Maximum safe speed at 70T.: 1715 RPM
CFM
I0JI 1203 137S
ov
1200
1400 1600
SP
RPM BHP
420 09 461 13 509 19
\ 4 * SP
RPM BHP
12498 1535 /
5/5
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638 .20
658 25 6S3 31
i4 SP
RPM BHP
772 29 777 34 793 41
r SP RPM BHP
893 44 89b 51
IV SP RPM BHP
2' SP RPM BHP
2\, SP RPM BHP
1547 1719 1891
221028000000
557 .26 616 .30 723
8608 34 661) 39 76U
658
44 V0b
49
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39 818
49 910
48 850
59 934
60 884 .71 963
59 1094
84
110070 .95 1262 1.23
183 1116 1.08 1266 1.37 1412
68
2063 2235 2407
2 2791 292 J 3095
2400 2600 2800
3000 32U0 3400 3600
711 .56 75? .61 842 .73 92?
88 1764 72 801 76 HM
961
88 1002 1 10/1819 852 93 928 1.05
85 99?
.98 1137 1.23 1276 1.53 1413 1 85
11/ till? 1 14 1166 l 42 1293 1 71 1421 204
20 1.33 1197 1.62 1317 1.92 1436 2.25
1873 2.10927 100 1 1982 1 1 2011038
1 07 1 29 1 54
82
903 954
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12 1 .14 1.59
8/
97? 1019 1066 1114
1.26 1 48
71
1044
1086 Mill 11/4
I 40 1 63
88 2.18
1109 1150 1 19'/ 1234
1.54 1.79 2.06 2.35
1230 1267 1305 1343
1 85
? 19 2.70
1348 1375 1409 1445
2.17 2 43 2.73 3.06
1456
1482 1511 1542
2 50 2 78 3.09 3.43
NOTE: Performance shown is for Junior Fans with outlet duct and with or without inlet duct. BHP shown does not include belt drive loss, but does include bearing drag, i "" i Tinted capacities indicate BHP requirements which may exceed
maximum motor limitations . . . see below.
SIZE 155
Capacities based on air density of .075 lbs. per cu. ft. Maximum safe speed at 70T.: 1400 RPM
1 | SP
l 4' SP
j SP
i4 SP
V SP
1 */* SP
2 SP
2l-i ' SP
OV RPM BHP RPM BHP RPM BHP RPM 8HP RPM BHP RPM BHP RPM BHP RPM BHP
1535 179) 2047
2303 2559 2815
1200 I4U0 1600
1800 2000 2200
342 380 418
459 500 542
13 401 .19 433 .27 467
37 $03 48 540 .63 579
17 510 24 529 .32 554
43 584 .55 615 .71 649
.26 609 .33 hlH 44 bJ7
.55 658 .69 685 86 714
.36 .41 .55
67 82 1.00
701 715
731 751 776
56 67
80 96 1.16
858 .93
866 1.08 991 1 39 878 1 26 997 1 58 1106 1.92 895 1 46 1007 1.80 1113 2.15
3071 3327 3583
3839 4095 4361 460?
2400 2600 2S00
3000 3200 3400 3600
584 61 620 89 685 1.05 715 I 20 am 1.37 914 1.70 in?n ? 05 117? 2 42 628 1.01 660 1.09 m 1 27' 780 1 45 833 1 G? 939 1 97 1019 7 14 IMS 2 7? 672 1.24 702 1.33 759 1.52 814 1 72 865 1.90 964 2 27 IUbU 2.66 1150 3.06
715 1 51 743 1 61 798 1 8? 850 2 02 899 2 21 991 2.61 1083 3 01 1170 3.44 759 1 81 785 1 93 818 2 14 887 ? m 9J4 2 57 1071 2.99 1109 3.41 804 2 16 828 2 28 8/7 2 51 9?4 2 73 970 2 9/ 1056 3.41 848 2 55 8/2 2 67 918 2 91 963 i ib 1006 3 40
NOTE- Performance shown is tor Junior Fans with outlet duct and with or without inlet duct. BHP shown does not include belt
drive loss, but does include bearing drag.
Tinted capacities indicate BHP requirements which may exceed
maximum motor limitations . . . see below.
COMPLETE PACKAGE MODEL NUMBERS
Junior Model
No.
Motor HP RPM
Adj. drive RPM
nge
125GO 125GB 125HB 125IB
'h 1150 'h 1725 V2 1725 % 1725
420.640
630^960 630 960
73a 1110
125JB
125KB 125LB 125M8
1 1750 1V2 1750 2 1750
3 1750
840/1240
920-1380 1040.-1430 1190/1540
COMPLETE PACKAGE MODEL NUMBERS
Junior Model
Motor HP RPM
Ad). drive
range
155GD
155HB
155IB 155JB
'/a Vi % 1
155KB-1
155KB-2 155LB
155MB
1V2
1 Vi
2
3
1150 1725 1725 1750
1750 1750 1750 1750
315-540 470'715 550 830 590/870
650 900 720-980 740/1110 830/1150
MAXIMUM MOTOR LIMITATIONS
Maximum motor frame'
Ojjen
TE
ML dimension maximum overall motor length
182T
182T
14V
Frame si/ns vary ill length with innlm in.imil.u tui-r I'.hv.k
NLMA "C" dimension against ML ........ ..
above it sp-nfic
make ol motor is required.
PAGE 7
MINIMUM/MAXIMUM V-BELT DRIVE CENTER DISTANCES
Motor frame sire
Minimum maximum centers in inches
48 56, 143T. 145T
182T
7.75/10.75 7.25/10.25 8.25/9.75
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ABD00204694
VCM GAS MONITORING SYSTEM VCM TANK FARM AREA
ABERDEEN CHMEICAL PLANT
Process Piping Schedule The following piping schedule uses a system of numbers and letters as a line designation. This system denotes the following information: line size, service, line number, insulation requirements, and piping specifications. Sample Line Designation 8 - AV - 001 - N - A52 - 1
Sample Piping Designation A 52 - 1
Service Designation Used Designation AV
Insulation Requirement N
Nominal Pressure Rating A
Piping Material 52
First Specification of A52 Group Piping Material Nominal Pressure Rating
Service Ventilation Air
None
150 Pound Class
Galvanized Steel Duct
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VCM GAS MONITORING SYSTEM VCM TANK FARM AREA
ABERDEEN CHEMICAL PLANT
Work List
fr
Purchase and install
is-'/'
jtfL'
gas sensors, AT-101 through AT-iTO, in
the vinyl tank farm area (see P&I diagram for exact -location).
These sensors should be installed 2-3 feet from grade level.
. ('-r
2 Purchase and install live-gas monitors, AI-121 through
n'Jfin
the emergency generator building located west of the control
room. Tie in the following gas sensors to the corresponding gas
monitor:
AT-101 & AT-102 to AT-103 & AT-104 to AT-105 & AT-106 to AT-107 & AT-108 to AT-109- .AX-110- fee-
AI-121 AI-122 AI-123 AI-124
3. Tie in the
r
gas monitors to two existing alarms located on the
incinerator alarm annunciator panel. These alarms will be used to
warn operations of any high readings of VCM from the five gas
monitors. These alarms are to be labeled TANK FARM HYDROCARBONS
ABOVE 25% LEL and TANK FARM HYDROCARBONS ABOVE 45% LEL.
Jk
Purchase and install a pressurization blower, F-150, at grade level near fire pump houses #1, #2, #3, and #4. Provide a 20 ft. stack for the inlet of the blower with a Bird screen and provide ducting, 8-AV-001, to fire pump houses.
Install HAND/OFF/AUTO switch, HS-130, for pressurization blower, F-150, and tie in this switch with the 25% LEL alarm in the control room so that when this alarm goes off, the blower starts.
