Model 204 - Sample Transfer Stripper (STS)

Model 204 – Sample Transfer Stripper (STS) Patented
Measure Volatile Hydrocarbons in Water
VOC’s in Water Model 204-V or Oil in Water Model 204-O

Click here for diagram or here for photograph.

The ASI / KECO Model 204 incorporates basic principles covered by patent 5,398,559 and patents pending.

A liquid or gas sample is allowed to continuously flow past one side of a non-selective permeable membrane while a carrier gas, hydrocarbon-free air, continuously flows past the other side of the membrane. Sample components permeate the membrane and are swept away to make a mixture of gases suitable for analysis. An exclusive & patented liquid Validation System is available as an option.

Texas Commission on Environmental Quality (TCEQ) has designated the Model 204 as “Best Available Control Technology” and “Equivalency” for continuous monitoring of cooling tower waste water applications. In addition, Shell Global has awarded us Preferred Vendor.

Save	On lab analysis costs, unattended online analysis
Safe	Purge option for explosion proof rating
Economical	Payout within days by preventing lost product. Losses of 12,000 pounds per day are caused by leaks
Low maintenance	Less than 5% of the service time for sparger or TOC analyzers
Built-in Liquid calibrator	Liquid Permeation tube or Microinject™ type, manual or timer type
Accurate	Grab samples for the lab deteriorate with time, VOC's escape during sampling
Accessories	Motorized spin clean filter and carrier purifier. A probe can be inserted in a line carrying plastic pellets

Heat Exchangers
Monitoring for hydrocarbon in cooling water or condensate allows the earliest warning of developing leaks. Maintenance can be scheduled in advance of costly equipment failure when leakage rate data is used for forecasting purposes. Boiler feed water monitoring for hydrocarbon, from heat exchangers can prevent power generation equipment damage. A validation permeation tube is optional.

Cooling Towers and Holding Ponds
Equipment leaks, spills, and drainage run-offs can cause build-up of hydrocarbon in the water. The Model 204 can give a continuous online indication of the volatile organic carbon (VOC) contained in these waters. Hand truck mounting and battery powered options available as well as laboratory models. Steam can be analyzed using a condensing coil.

Waste Water
Where the dissolved hydrocarbon or oil content could be PPBw, PPMw, or at saturation levels, Model 204 can be easily configured to provide continuous measurement online.

Process Stream Analysis and Laboratory Analyzers
Model 204 is compatible with GC, IR, UV, Mass Spec, Moisture and Tape type analyzers for measuring the components of interest in gas or liquid hydrocarbon sample streams. Applications include, but are not limited to:

* Measurement of H₂S in Fuel Gas, Liquid Aromatics, Kerosene, Gasoline, Beverages, Amine Treated Gas, Sour Gas and Water

* Measurement of Volatile H/C's from Hydrocarbon Gas Streams, Hydrocarbon Liquid Streams, Aromatics, Alcohols, oils, and Paraffins in Water Streams. For many of these applications, a readout able to identify hydrocarbons is required such as a GC.

Leaks of hydrocarbons from heat exchangers can emit large quantities of Volatile Organic Carbons (VOC). This can be a hazard from a flammability standpoint as well as cause emissions into the atmosphere. 99.9 to 100% of VOC are stripped to the atmosphere in cooling towers and have been found to be 12,576 pounds per day from a single exchanger. On-line continuous monitoring can pay for an analyzer in a short time by warning of corrosion leaks. Savings in lost product and laboratory time can be substantial.

Fortunately, airflow through a cooling tower dilutes the hydrocarbon, allowing higher concentrations than shown on the right column before the cooling tower catches fire.

A typical cooling tower with 10 PPM by weight hydrocarbon content will emit 15,000 lbs./day lost product.

ETHYLENE & PROPYLENE PLANTS ASI / KECO INSTRUMENT APPLICATIONS USING SAMPLE TRANSFER STRIPPER™
TYPICAL INSTALLATIONS MODEL 204, APPROVED BY TNRCC FOR REPORTING.
1. MEASURE HYDROCARBONS IN
	COOLING WATER. RANGING: 0 to 10 PPB or PPM to saturation MEASURES: Volatile Organic Carbon (VOC) in water. Any hydrocarbon having a hydrogen carbon bond to molecular weights of several hundred. READ-OUT: GC if there is need to identify hydrocarbon. Solid state sensor to measure total VOC or when hydrocarbon is known. Mass Spectrometer. MEASURING POINT: Cooling tower, a group of heat exchangers, steam condensate. Can be used to calculate emission rates or prevent loss of product.
2. CLEAN-UP OF CONTAMINATED
	WATER, MEASURE INPUT AND OUTPUT VOC STEAM STRIPPER: Measure VOC at input and output control steam required & save fuel costs or to regulate maximum through output CARBON BED STRIPPER: Same as above BIOLOGICAL PROCESS: Regulate additives, oxygen required, output rate.
3. PELETIZED PLASTIC PRODUCTS:
	Use Model 204 with membrane probe to measure hydrocarbons and/or oxygen in process pipes, for nitrogen or steam drive. Use to report emission rates or warn of hazardous concentrations. Sample can be brought to the analyzer rather than use a probe. A 2" gate or ball valve can be used to insert and withdraw a probe. Calibration methods: Permeation tubes can be used to generate PPM or PPB samples to validate analyzer response. A liquid or gas trace can be fed into a liquid or gas stream. Alternatively, ASI / KECO can supply its proprietary Microinjector™ method to directly inject trace liquids or water saturated with propylene, for example, to make PPM or PPB calibration standards. Low maintenance: Membrane Sample Transfer™ for sampling *radically reduces maintenance* for GC, MS, IR, UV and solid state analyzers. The clean, dry sample can pay for the sample preparation system by lowering maintenance time and cost.