SERIOUS OILFIRE GAS AND SMOKE DANGERS

File: 970313_jun96_decls1_0032.txt
Page: 0032
Total Pages: 35

Subject: SERIOUS OILFIRE GAS AND SMOKE DANGERS                           

Unit: VII CORPS   

Parent Organization: ARCENT      

Box  ID: BX000249

Folder Title: ENGR PLAN INTEL                                                                                 

Document Number:          9

Folder Seq  #:         84





                                                     UNCLASSIFIED


              AST-266OZ-148-90
              9 January 1991


              2. Optimum Materoloaicai Conditions for Hydrogen Sulfide Gas-Cloud Formation
                  (U)

                a.(U                       Depending on the season and weather conditions,
              asso6iiktad hydrogen sulfide gas can be released to form toxic-gas cloud
              obstacles to advancing troops. The greatest danger of these gas clouds foming
              is under the following conditions:

                              Winter, during cool, calm, humid conditions--
                              especially late at night or In the early morning.

                       0      Winter, during Inversions where warm, humid air is
                              trapped below a cold-air layer. In these conditions,
                              it would be calm and most likely be late at night
                              or early morning.

              Summer conditions are not favorable for dense hydrogen sulfide gas-cloud
              formation due to increased evaporation because of elevated surface temperatures,
              lower humidities, and surface winds that average 15 mi/h. All of these factors
              contribute to dissipate the gas.
                b(L)is toorem; in        Under calm or near calm winter conditions in the KTO,
              hydrogen sulfide gas could collect in low areas, trenches, and marshes. This
              collected gas could have pockets attaining lethal concentrations. Additionally,
              this colorless gas cloud, if Ignited, will flash and could form a ground-level
              FAR.
                c@U)               To minimize the hydrogen sulfide gas danger, troops should
              avoid low areas where this heavier-than-air gas will collect and try to conduct
              tactical operations upwind from the gas source.



















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                                                 UNCLASSIFIED

Document 35 f:/Week-24/BX000249/ENGR PLAN INTEL/serious oilfire gas and smoke dangers:0128971851472
Control Fields 17
File Room = jun96_declassified
File Cabinet = Week-24
Box ID = BX000249
Unit = VII CORPS
Parent Organization = ARCENT
Folder Title = ENGR PLAN INTEL
Folder Seq # = 84
Subject = SERIOUS OILFIRE GAS AND SMOKE DANGERS
Document Seq # = 9
Document Date =
Scan Date =
Queued for Declassification = 01-JAN-1980
Short Term Referral = 01-JAN-1980
Long Term Referral = 01-JAN-1980
Permanent Referral = 01-JAN-1980
Non-Health Related Document = 01-JAN-1980
Declassified = 13-FEB-1997