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It is the responsibility of the Central Safety Testing Lab staff to scantest results into the database and to serve as database administrators. No general rules or easy answers exist for understanding the potentialconsequences of uncontrolled chemical reactions, due to the diversity ofchemicals and reaction pathways. Factors such as stirring speed,agitator configuration, materials of construction, variations in additionrate, reactant concentrations and hold times can affect these rates.

If itis allowed to freeze, its added inhibitor will separate out and an uncon-trolled reaction can be initiated during thawing of the material. Examples of other deviations thatare typically encountered in reactive systems involving intentional chemis-try include: Bar code systems can code incoming products withinformation regarding composition, compatibility, storage location,and quantity.

Issues of importance, which should be addressed by themanagement system, include specifying who will keep the records, whereand how they will be maintained, and how they can be retrieved and usedat both the facility and company-wide levels. This procedure is based on typical residence times and onset values for reactions as well as process operations. Information is generatedthat forms the basis for sound decisions and that documents how the deci-sions were implemented.

Determination of these limits is outside the scope of this publication; refer-ences such as Barton and RogersCCPS a and HSE canbe consulted for further information. By contrast, the nature of certain accident scenarios could prove to bequite sensitive to some design parameters.

  AR 601-100 PDF

For example, it may be determined that a certain unde-sired, yet potential, reaction could lead to two-phase flow throughthe relief valve of a storage or mixing vessel. Technical evaluation of options and consequence and risk analysesmay be prepared.

Essential Practices for Managing Chemical Reactivity Hazards

Forexample, an explanation to a design engineer why a particular design basiswas chosen will be a significantly different communication than emer-gency response training of operations personnel.

Management elements common to all safety manage-ment systems, such as emergency response, have not been included in thischapter. Some actions may be taken immediatelyupon notification of a problem, deficiency, or uncontrolled hazard, whileother actions may be longer term and require action planning CCPS Where boundary conditions clearly deviate from such values it is necessary to consider these when determiningTexo. However,70 Managing Chemical Reactivity Hazardseducating top management is critical.

The chemical information for acetic anhydride, for example, isshown in Figure 4. When procedures involve critical steps that must be performed cor-rectly in order to prevent uncontrolled reactions, consider the use ofchecklists where critical steps or tasks are signed or initialed whencompleted. A typical assumption isthat all the energy from the heat of reaction increases the temperature ofthe mixture.

The program predicts the results of binary mixtures by reactive groupcombinations. Acetone from leakingbottle contacts papermaterial in feederNofeeder isenclosed andabove ambienttemperatureNR Acetone not reactive with papermaterial by common experience;feeder is hot but belowautoignition temperatures; sealshould prevent flashback2.

Failure to achieve this positive atmosphere willresult in low or no reporting of near misses, which may ultimately lead to acatastrophic incident that could have been otherwise avoided.

ABB Switchgear Manual,10E 2001

The Worksheet not only indicates possible hazardous inter-actions, it also sets up a compatibility chart and indicates potential conse-quences of the interactions e. Charbroiled ChemicalsDo the answers to the following 159 indicate chemical reactivity hazard s arepresent? It should be noted that safe operating temperatures and pressures for reac-tive systems might be well below the design temperatures and pressures ofthe equipment. Combining materials, intentionally or inadvertently, maycreate a reactive mixture with properties not described on any indi-vidual MSDS.


Process Safety Progress13 4: Realistically, the information available to perform annlage studies variesover the lifetime of a process.

anlage trgs pdf – PDF Files

Since they only address the likeli-hood of undesired events, these methods are often combined with conse-quence severity calculations in a quantitative risk analysis, as described byCCPS b. Methods used todetermine chemical reaction risks are varied, as are their objectives anddata requirements. Qualitative and Quantitative MethodsMany methods have been developed that are suitable for assessing risksassociated with the operation of facilities involving chemical reactivity haz-ards.

For example, maximum intended inventory might beintentionally limited by that below which there would be no off-siteimpacts. Guidelines for Safe Warehousing of Chemicals.

Essential Practices for Managing Chemical Reactivity Hazards – [RAR Document]

Which reactions actually occur Reaction kinetics how fast a chemical reaction will proceed, and therate of heat production and off-gas evolution Whether reactions will proceed to completion Additional undesired side reactions, including decompositions The thermal inertia of the environment surrounding the reaction.

Nevertheless ttrgs the author s nor theauthority having jurisdiction, which initiated the preparation of this guideline, give anyguarantees for the correctness 1.4 statements, directions and advice as well as for possiblemisprints.

It must beable to manage even subtle material, equipment or personnel changes thatmay have a significant effect on the safety of the operation.