Asbestos Abatement >> How To Remove Asbestos From Carpet

Method Performance -- Precision and Accuracy Precision is dependent upon the total number of fibers counted and the uniformity of the fiber distribution on the filter. A general  rule is to count at least 20 and not more than 100 fields. The count is discontinued when 100 fibers are counted, provided that How To Remove Asbestos From Carpet 20 fields have already been counted. 

Counting more than 100 fibers results in only a small gain in  precision. As the total count drops below 10 fibers, an accelerated loss of precision is noted. At this time, there is no known How To Remove Asbestos From Carpet method to determine the absolute accuracy of the asbestos analysis. 

Results of samples prepared through the Proficiency Analytical Testing (PAT) Program and analyzed by the OSHA-SLTC showed no How To Remove Asbestos From Carpet significant bias when compared to PAT reference values. The PAT samples were analyzed from 1987 to 1989 (N = 36) and the concentration range was from 120 to 1,300 fibers/mm. 

Interferences Fibrous substances, if present, may interfere with asbestos analysis. Some common fibers are: Fiberglass Anhydrite Plant Fibers Perlite Veins Gypsum Some Synthetic Fibers Membrane Structures Sponge How To Remove Asbestos From Carpet Spicules Diatoms Microorganisms Wollastonite.

The use of electron microscopy or optical tests such as polarized light, and dispersion staining may be used to differentiate these How To Remove Asbestos From Carpet materials from asbestos when necessary. 5. Sampling 5.1. Equipment 5.1.1.Sample assembly (The assembly is shown in Figure 3). 

Conductive filter holder consisting of a 25-mm diameter, 3-piece How To Remove Asbestos From Carpet cassette having a 50-mm long electrically conductive extension cowl. Backup pad, 25-mm, cellulose. Membrane filter, mixed-cellulose ester (MCE), 25-mm, plain, white, 0.4 to 1.2-um pore size. Notes: Do not re-use cassettes. 

Fully conductive cassettes are required to reduce fiber loss to the sides of the cassette due to electrostatic attraction. Purchase filters which have been selected by the manufacturer for asbestos counting or analyze representative filters for fiber background before use. Discard the How To Remove Asbestos From Carpet filter lot if more than 4 fibers/100 fields are found. 

To decrease the possibility of contamination, the sampling system (filter-backup pad-cassette) for asbestos is usually preassembled by the manufacturer. Other How To Remove Asbestos From Carpet cassettes, such as the Bell-mouth, may be used within the limits of their validation. 5.1.2.Gel bands for sealing cassettes. 5.1.3.Sampling pump. 

Each pump must be a battery operated, self-contained unit small enough to be placed on the monitored employee and not  interfere with the work being performed. The pump must be capable of sampling at the collection rate for the required How To Remove Asbestos From Carpet sampling time. 5.1.4.Flexible tubing, 6-mm bore. 5.1.5.Pump calibration. 

Stopwatch and bubble tube/burette or electronic meter. 5.2. Sampling Procedure 5.2.1.Seal the point where the base and cowl of each How To Remove Asbestos From Carpet cassette meet with a gel band or tape. 5.2.2.Charge the pumps completely before beginning. 5.2.3.Connect each pump to a calibration cassette with an appropriate length of 6-mm bore plastic tubing. 

Do not use luer connectors -- the type of cassette specified above has built-in adapters. 5.2.4.Select an appropriate flow rate for the situation being monitored. The How To Remove Asbestos From Carpet sampling flow rate must be between 0.5 and 5.0 L/min for personal sampling and is commonly set between 1 and 2 L/min. Always choose a flow rate that will not produce overloaded filters. 

Calibrate each How To Remove Asbestos From Carpet sampling pump before and after sampling with a calibration cassette in-line (Note: This calibration cassette should be from the same lot of cassettes used for sampling). Use a primary standard (e.g. bubble burette) to calibrate each pump. If possible, calibrate at the sampling site. 

Note: If How To Remove Asbestos From Carpet sampling site calibration is not possible, environmental influences may affect the flow rate. The extent is dependent on the type of pump used. Consult with the pump manufacturer to determine dependence on environmental influences. 

If the pump is affected by temperature and pressure changes, correct the flow rate using the formula shown in the section "Sampling Pump Flow Rate Corrections" at the end of this appendix. 5.2.6.Connect each pump to the base of each How To Remove Asbestos From Carpet sampling cassette with flexible tubing. Remove the end cap of each cassette and take each air sample open face. 

Assure that each sample cassette is held open side down in the employee's breathing zone during How To Remove Asbestos From Carpet sampling. The distance from the nose/mouth of the employee to the cassette should be about 10 cm. Secure the cassette on the collar or lapel of the employee using spring clips or other similar devices. 

A suggested minimum air volume when sampling to determine TWA compliance is 25 L. For Excursion Limit (30 min sampling time) evaluations, a minimum air volume of 48 L is recommended. 5.2.8.The most significant problem when How To Remove Asbestos From Carpet sampling for asbestos is overloading the filter with non-asbestos dust. 

Suggested maximum air sample volumes for specific environments are: Air vol. Environment | (L) Asbestos removal operations (visible dust) Asbestos removal operations (little dust Office environments Caution:Do not overload the filter with dust. High levels of non-fibrous dust particles may obscure fibers on the filter and lower the count or make How To Remove Asbestos From Carpet counting impossible. 

If more than about 25 to 30% of the field area is obscured with dust, the result may be biased low. Smaller air volumes may be necessary when there is excessive non-asbestos dust in the air. While How To Remove Asbestos From Carpet sampling, observe the filter with a small flashlight. 

If there is a visible layer of dust on the filter, stop sampling, remove and seal the cassette, and replace with a new sampling assembly. The total dust loading should not exceed 1 mg. 5.2.9.Blank samples are used to determine if any contamination has occurred during How To Remove Asbestos From Carpet sample handling. Prepare two blanks for the first 1 to 20 samples. 

For sets containing greater than 20 samples, prepare blanks as 10% of the samples. Handle blank samples in the same manner as air samples with one exception: Do not draw any air through the blank How To Remove Asbestos From Carpet samples. Open the blank cassette in the place where the sample cassettes are mounted on the employee. 

Hold it open for about 30 seconds. Close and seal the cassette appropriately. Store blanks for shipment. Immediately after How To Remove Asbestos From Carpet sampling, close and seal each   cassette with the base and plastic plugs. Do not touch or puncture the filter membrane as this will invalidate the analysis. 

Attach and secure a sample seal around each sample cassette in such a way as to assure that the How To Remove Asbestos From Carpet end cap and base plugs cannot be removed without destroying the seal. Tape the ends of the seal together since the seal is not long enough to be wrapped end-to-end. Also wrap tape around the cassette at each joint to keep the seal secure.

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