Safety 1st Advancer Manual del operador descargar pdf (Pagina 85)

Environmental Remediation Drilling

Safety Guidelines

Page 85 of 132

4.16.1 - Typical Cleaning Methods

Typical cleaning methods work by either dissolution or by forcing the contaminant off a surface with

pressure. In general, less of the equipment surface is removed using non-abrasive methods.

• High-Pressure Water - using a high-pressure pump, an operator controlled directional nozzle, and high-

pressure hose. Operating pressure usually ranges from 340 to 680 psig, which relates to flow rates of 20

to 140 lpm.

• Steam Cleaning - using water delivered at high pressure and high temperature in order to remove

accumulated solids or oils.

• Mechanical - using brushes with metal, nylon, or natural bristles or utilizing appropriate tools to scrape,

pry, or otherwise remove adhered materials.

• Dissolving - using chemicals to dissolve surface contaminants as long as the solvent is compatible with

the equipment and protective clothing. Organic solvents include alcohols, ethers, ketones, aromatics,

straight-chain alkanes, and common petroleum products. Halogenated solvents are generally

incompatible with protective clothing and are toxic.

• Surfactants reduce adhesion forces between contaminants and the surface being cleaned and prevent

reposition of the contaminants. Non-phosphate detergents dissolved in tap water is an acceptable

surfactant solution.

• Disinfection and Sterilization - using chemical disinfectants to inactivate infectious agents. Standard

sterilization methods are impractical for large equipment and personal protective clothing.

4.16.2 - Personnel and Equipment Decontamination Plan

As part of the site-specific health and safety plan, a personnel and equipment decontamination plan should

be developed and set up before any personnel or equipment enters the areas of potential contamination.

These plans should include:

• Number and layout of decontamination stations,

• Decontamination equipment needed,

• Appropriate decontamination methods,

• Procedures to prevent contamination of clean areas,

• Methods and procedures to minimize worker contact with contaminants during removal of protective

clothing,

• Methods and procedures to prevent cross-contamination of samples and maintain sample integrity and

sample custody, and

• Methods for disposal of contaminated clothing, equipment, and solutions.

Revisions to these plans may be necessary for health and safety when the types of protective clothing, site

conditions, or on-site hazards are reassessed based on new information.

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Safety 1st Advancer Manual del operador Pagina 85