Cryogenics

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15 Νοε 2013 (πριν από 3 χρόνια και 7 μήνες)

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ALBUQUERQUE FIRE DEPARTMENT

STANDARD OPERATING GUIDELINES



Cryogenics

SOG 5
-
6
-
11









Page
1

of
1






SOG Committee
Action

Implemented

07
/01/08

Revision

Implemented

07/01/08

Background

Although definitions vary, a cryogenic material is any material that has a boiling point
below

150
0

F. There are 3 general characteristics of cryogenic materials: they have
extremely low boiling points, all boil at ambient temperatures, and al
l have extremely
large liquid
-
to
-
vapor expansion ratios. Cryogenics are divided into 3 basic groups: 1)
flammables (liquefied methane or LNG), oxidizers (liquefied oxygen or LOX), and non
-
flammables (nitrogen, argon, and other inert or “noble gases”).


Con
siderations:

-

All cryogenic gases are colorless and invisible

-

All are extremely cold and can cause freezing of tissue

-

All (except oxygen) displace breathable air; responders could be asphyxiated
before they recognize the problem

-

Do not apply water to vent a
rea of containers; it could freeze vent open or
closed, leading to over
-
pressurization

-

If cryogenic container is damaged externally and inner skin is exposed,
application of water will heat product which will initiate or increase boiling

-

Cryogenics will c
ause metal objects to become brittle

-

LOX can cause certain organic materials to spontaneously ignite; when mixed
with petroleum products, will produce a contact explosive

-

Liquid hydrogen burns with an invisible flame and is readily ignited by heat,
fricti
on, static or electrical sparks

-

Cryogenics will remain close to the ground and flow into low lying areas


-

Cryogenic containers can BLEVE


Response Objectives:


No Fire

-

Isolate area, use ERG to determine initial isolation distances and



protective actions



-

Stay upwind and out of low lying areas



-

Prevent product contamination with other materials



-

Control ignition sources



-

Do not walk through vapor cloud or product pool



-

Damaged containers should be handled b
y specialists



-

Remember: vapor cloud only represents
visible
product


Fire


-

Evacuate area



-

Protect exposures and cool tank if possible (use caution: if inner skin is


exposed, water will heat product and initiate or inc
rease boiling)



-

Remember: cryogenic containers can BLEVE