DES 3000 Product Bulletin

EST™ Type DES 3000: Features & Benefits as Compared to Traditional Caustic Scrubbers

• No chemical maintenance• New as well as exhausted media is

non-hazardous• One moving part - blower• No chemical pumps• Chemical leak containment is not

required• No heaters required in cold climates• Safe• User-friendly• Dependable operation• Tested and certified• Low cost of ownership

Type “STS” 4 mm impregnated activated alumina beads

DES 3000 Case Study“Believe me, there was little enthusiasm for listening to another presentation on chlorine containment,” said Ed Morley, safety officer for the water district. “We were prepared to go with a chlorine cylinder containment system, even though its protection was limited to cylinder leaks. But after hearing about the EST Type DES, there was an immediate 180-dgree turn. The dry scrubber had it all – total chlorine leak protection, easy maintenance and no hazardous chemicals.”

Frequently Asked Questions Dry Emergency Chlorine Gas Scrubber Systems

Frequently Asked Questions– 1 Q: What exhaust rate is needed on the chlorine room to be scrubbed?– 1A: The Uniform Fire Code directs us to treat the worse case release. By

design the worse case is the fusible plug in the head of the container that can emit gas at a peak rate of 2380 scfm. In order to adhere to the UFC guideline of negative pressure in the room at all times we need to exhaust the room at a rate higher then 2380 scfm. The STWP/ESTTM standard for the ‘DES 3000’ is 3000 cfm.

– 2 Q: How long will it take before I can go back into the room?– 2 A: After the leak has ended it will take approximately 45 minutes for a typical

10,000 cu. ft. room before it is safe to enter. Ultimately, once the room concentration is down to 0.5 ppmv chlorine it is safe for normal occupancy according to OSHA. Entry is normally at the 1 ppmv level as established by a non-contaminated chlorine sensor other than the normal contaminated room sensor that may be poisoned after exposure to high chlorine concentrations.

– 3 Q: What is the life expectancy of the Type “STS” dry media? – 3 A: The Type “STS” dry media has an indefinite life expectancy if not exposed

to chlorine.

Frequently Asked Questions - continued

• 4 Q: What is the replacement cost of the Type “STS” dry media?• 4 A: A complete DES 3000 media bed replacement of 27,000 pounds costs about a

third the price of the initial system. Complete media replacement is rare. According to STWP’s records over the past 20 years in over 500 systems there has only been one time when a single release event consumed more than half of the media. In fact, the second largest leak consumed just less than 1% of the available media.

• 5 Q: What size containers are used to ship the Type “STS” dry media?• 5 A: The media can be shipped in 2500 pound bulk bags referred to as supper sacks

or 350-pound 55-gallon drums. The bulk bag is the bottom-spouted style requiring a lifting device. Drums are typically preferred due to ease of handling and unloading.

• 6 Q: Is dry media more expensive to replace then wet media?• 6 A: See the treatise on the topic available in this packet titled “True Cost of Dry

Media Replacement in Emergency Scrubbers - Dry versus Wet Operation”. The 20-year extrapolated data show the replacement costs for the chemical to be two times that of the dry media considering handling, disposal, life expectancy, and new media bare costs.

Frequently Asked Questions - continued– 7 Q: How is the Type “STS” dry media removed and added to the

scrubber?– 7 A: In the DES 3000 the top manway is removed and a vacuum hose can draw the

beads off the top or the first uncontaminated sample port can be used for extraction by a vacuum hose. The fresh media can be loaded by buckets to the original full mark for small load replacements. For larger, 2500# Super Sack replacements, a lifting device is required to place the sack over the scrubber vessel to allow free-fall of the media into

the tank. A full lot of fresh media can be manually loaded in less than 4 hours. – 8 Q: How long would it take to receive replacement of Type “STS” dry

media?– 8 A: It is advised to keep a spare lot of media on hand at all times. The

replacement media can take 2 to 3 weeks to arrive depending on method of shipment. All deliveries are based upon current shop loadings and the time the order was received; first in - first out.

– 9 Q: How do I know I need more media?– 9 A: In the event of a leak or after every year of operation the media should be

sampled. Sample ports are provided on the side of the tank. Each sample port is un-plugged and media is removed and sent to STWP who will have the sample analyzed at a qualified third-party laboratory. Spent media has a characteristic sulfur odor while unaffected media has no odor.

Frequently Asked Questions - continued

– 10 Q: How do I dispose of the spent Type “STS” media?– 10 A: Spent Type “STS” media should be disposed of as directed by the local

authorities or receiving dump. Local, state and federal guidelines may vary and these guidelines must be followed during the disposal phase. However, in most cases the media is considered non-hazardous and land-fill disposable. The pH of the media resides between 2.5 for the spent to 10 for the fresh media. Most landfills accept solids within the pH range of 2 to 12.

– 11Q: Are there any other sources for the replacement media?– 11 A: There are other sources of dry media that react with chlorine available on

the open market that do not meet STWP specifications. As such STWP can not predict their performance. Therefore, the use of these media in the DES 3000 will render all STWP warrantees and performance guarantees null and void.

– 12 Q: Do I need to install the Type DES 3000 system with Type “STS” media indoors in a cold climate?

– 12 A: Type “STS” media has satisfactorily performed in tests down to -400F without the need for heating.

– 13 Q: What service contracts are available for maintaining the Type DES 3000 system?

– 13 A: STWP offers custom onsite service contracts upon request. Consult the factory for more details.

Frequently Asked Questions - continued

– 14 Q: What is the chlorine concentration at the discharge vent?– 14 A: STWP guarantees the discharge concentration within the capacity range of

the Type “STS” media will not exceed that allowed by the Uniform Fire Code or less than one-half the chlorine IDLH (set at 10 ppmv) or no more than 5 ppm. Testing under full load scenarios has shown actual concentrations of less than 1 ppm for the majority of the chlorine release.

– 15 Q: Is the Type “STS” media flammable?– 15 A: Type “STS” media is classified, Class 1, or non-flammable with a National

Fire Protection Agency (NFPA) rating of zero. Ask for the Type “STS” media MSDS sheet.

– 16 Q: What is the shipping class for the Type “STS” media?– 16 A: Shipping Class 70; NMFC 43944.– 17 Q: Is a stack sensor required?– 17 A: Stack sensors are suggested by the NFPA 1 Uniform Fire Code but are

implemented at the judgment of the local fire marshal. Not all emergency scrubbers have stack sensors.

Frequently Asked Questions - continued

– 18 Q: When does the scrubber start?– 18 A: The scrubber is usually set to start in response to a room chlorine sensor

reading at 3 ppm of chlorine. The same signal turns off the normal room ventilation system.

– 19 Q: What is the active ingredient in the Type “STS” media?– 19 A: The name itself “STS” stands as an abbreviation for the active ingredient

called “Sodium Thiosulfate”. Using a proprietary process, the Type “STS” media is impregnated in an activated alumina oxide. Please see the MSDS for more details.

– 20 Q: Can the spent Type “STS” media be regenerated?– 20 A: No– 21 Q: Have there ever been any chlorine leaks where the Type “STS” media

was called upon to perform?– 21 A: Yes and the system worked as designed and the customer has since

purchased 7 additional systems.

Frequently Asked Questions - continued

– 22 Q: Can we use the scrubber as our normal air ventilation system?– 22 A: This is not recommended. Due to static charges, air borne dust particles

could attach to the media. This leads to excessive pressure drop, poor flow distribution through the media bed and media pore blockage. It is also not recommended to use the scrubber fan for room ventilation while bypassing the media bed. This complicates an emergency response system by relying on activation of mechanical devices such as automatic dampers and louvers to work and does not comply with normal emergency design philosophy.

– 23 Q: Can STWP offer a wet scrubber for a one-ton chlorine container emergency applications?

– 23 A: Without prejudice, STWP can offer both wet and dry emergency chlorine scrubbers. STWP is the only single source provider of wet packed, wet packless and dry scrubbing technologies in the world today. It should be noted that 95% of all emergency chlorine scrubber systems specified today for one-ton chlorine containers are dry. Simplicity, cost of ownership and safety are the reasons.

– 24 Q: What is the routine maintenance required for the EST™ Type DES 3000?– 24 A: The only moving part is the blower. This requires routine fan belt

inspection and greasing of the bearing as required by the manufacturer. It is recommended to breakdown the fan yearly for cleaning.

– 25 Q: Does the EST™ Type DES 3000 system come with a control panel?– 25 A: The system is supplied with an FRP NEMA 4X control panel for remote

mounting. It includes remote start, local start and stop, system alarm, blower motor starter, transformer and more. It requires 480 Vac, 3 phase, 60 Hz power supply.

Frequently Asked Questions - continued

EST™ Type DSH 400 Dry Emergency Chlorine Gas Scrubber

System

Standard Design to treat 150-pound Chlorine Cylinders

DSH 400 Product Bulletin

Threaded Fusible Plug in Valve Body

150-Pound Cylinders

8. Drawings –

Drawings: Layout and Parts

10’ Long x 5’ Wide x 7’ Tall

Flanged Lid

Suction Duct

Rubber Pad

Sample Ports

Exhaust Fan - outside the storage room

other side of wall

EST™ Type DSH 400 Installed Inside Storage Room

150# Cylinder Room

Scrubber

EST™ Type DSH 400 Outside Storage Room

No-Loss Discharge StackDifferential Pressure

4 Sample Ports

2 Hp Fan

Suction Duct

Drain

FRP Skid

EST™ Type DSH 400 Skidded Assembly

EST™ Type DSH 400 Scrubber Dry Media Refill

Containment Design and Considerationsfor

Emergency Chlorine Gas Scrubber Systems

Room Audit Check List

Room Design Punch List

Containment Design and Considerations

• Pick-up duct at 12” to 18” above floor• Slope floors - confined corner sump (not required for 150# cylinders)• Doorways - step-down/grating covered (not 150# cylinders)• Check for liquid escape routes (not for 150# cylinders where only gas is

expected to escape)

Chlorine Room Design Considerations

Chlorine Room Containment DesignDon’t forget to contain the liquid chlorine boiling off the floor at -29F

Avoid Sprinkler Systems Spraying water onto standing puddles of boiling chlorine can cause

expanding gas that can blow out windows and door

Dual Room Collection Scrub both storage and feed rooms!

EST™ VEGA Vent Exhaust Gas Arrestor

To treat vacuum regulator vent releases

EST™ “VEGA” Vent Exhaust Gas Arrestor

Type “STS” 4 mm

Impregnated Activated Alumina

Beads

VEGADSH 400

DES 3000

EST™ “VEGA” Vent Exhaust Gas Arrestor

•Treat vacuum regulator vent line•Reduces room corrosion and outside releases•Five gallon HDPE disposable bucket•Bucket and Chuck-It•Dimensions are 10” Square x 15” Tall•Mounts on the floor•Passive – No fans required•Pressure loss is less than same length of tubing•Carbon free non-flammable alumina oxide media•Weighs 35 pounds with ‘STS’ 4 mm media beads•Scrubs over 3 pounds of chlorine•Media is non-toxic in fresh or spent forms•Available with 3/8”, 1/2” and 5/8” hose adaptors•Stackable for gas-side series mounting•Visible Exhaustion Indicating Strips

VEGA Beta Site Photos 2007

Thank you from… Severn Trent Water Purifications, Inc.

EST Products