47:(heat + oxygen + fuel + chemical chain reaction = fire). To a much smaller degree it also has a smothering effect by excluding oxygen from the fire. "Dry chemical" extinguishers, such as Purple-K, are different from "dry powder" extinguishers that are used to fight Class D flammable metal fires.
50:
Purple-K was developed by the United States Naval
Research Laboratory in 1959, as an improvement over sodium bicarbonate for extinguishing oil and gasoline fires. It was named due to the characteristic lavender tint imparted to flames, owing to the potassium (chemical symbol "K") content.
121:
Cleanup of spent agent can be difficult, as it forms a residue when discharged. If the spent agent is dry it can be removed by suction, but when combined with water, hydrocarbons and other liquids, it forms a thick crusty scum that can be challenging to remove.
106:
Purple-K is commonly used in oil refineries, airport ramps, service stations, military facilities, naval warships, power plants, and other places where large volumes of flammable liquids are handled. It is often paired with foam in
43:. Some fire extinguishers are capable of operation in temperatures down to −54 °C or up to +49 °C. Dry chemical works by directly inhibiting the chemical chain reaction which forms one of the four sides of the
35:
after Monnex (potassium allophanate), and can be used against some energized electrical equipment fires (USA class C fires). It has about 4–5 times more effectiveness against class B fires than
59:
Purple-K powder has an acrid taste and odor, is free-flowing, floating on most liquids, non-abrasive, does not wet with water and is compatible with most
173:
Fire extinguishing powders. A. E. Finnerty US. Army
Research Laboratory, L. J. Vande Kieft. Halon Options. Technlcal Working Conference 6-8 May 1997.
118:
Purple-K is used in many forms, from small handheld fire extinguishers to large mobile and stationary units, including fixed-nozzle piping systems.
108:
215:
230:
184:
158:
174:
210:
88:
64:
112:
63:. It has violet color, to distinguish it from other dry agents. Its principal component is
8:
68:
40:
154:
76:
60:
24:
130:
44:
36:
224:
28:
94:
Purple-K is normally non-toxic, but ingestion of a large amount can cause
84:
126:
95:
23:, is a dry-chemical fire suppression agent used in some dry chemical
196:"Purple K Powder", "Naval Aviation News", September 1959, page 19,
133:), as the resulting chemical reaction will destroy its efficiency.
80:
72:
32:
27:. It is the second most effective dry chemical in fighting
151:
222:
223:
67:(78–82% by weight), with addition of
169:
167:
125:Purple-K should never be mixed with
13:
164:
54:
14:
242:
203:
129:-based fire suppression agents (
209:U.S. Naval Research Laboratory
190:
178:
143:
39:, and more than twice that of
1:
185:Dry Chemical Agents- Purple-K
136:
89:methyl hydrogen polysiloxane
7:
10:
247:
111:, usually found fitted to
216:MSDS for Purple-K powder
231:Fire suppression agents
113:airport fire appliances
101:
149:Glenn Corbett (ed.),
83:(0.2–%), and is made
65:potassium bicarbonate
31:(flammable liquid)
109:twin agent systems
79:(1–3%), amorphous
69:sodium bicarbonate
41:sodium bicarbonate
25:fire extinguishers
61:foam concentrates
238:
197:
194:
188:
182:
176:
171:
162:
153:Penn Well 2009,
147:
131:ABC dry chemical
45:fire tetrahedron
19:, also known as
246:
245:
241:
240:
239:
237:
236:
235:
221:
220:
211:Purple-K-Powder
206:
201:
200:
195:
191:
183:
179:
172:
165:
148:
144:
139:
104:
57:
55:Characteristics
12:
11:
5:
244:
234:
233:
219:
218:
213:
205:
204:External links
202:
199:
198:
189:
177:
163:
141:
140:
138:
135:
103:
100:
77:Fuller's earth
56:
53:
37:carbon dioxide
9:
6:
4:
3:
2:
243:
232:
229:
228:
226:
217:
214:
212:
208:
207:
193:
186:
181:
175:
170:
168:
160:
156:
152:
146:
142:
134:
132:
128:
123:
119:
116:
114:
110:
99:
97:
92:
90:
86:
82:
78:
74:
70:
66:
62:
52:
48:
46:
42:
38:
34:
30:
26:
22:
18:
192:
187:in Chemguard
180:
150:
145:
124:
120:
117:
105:
93:
58:
49:
20:
16:
15:
85:hydrophobic
159:1593701357
137:References
91:(0.2–1%).
71:(12–15%),
127:phosphate
96:alkalosis
225:Category
161:page 98
75:(1–3%),
17:Purple-K
29:class B
157:
81:silica
33:fires
155:ISBN
102:Uses
73:mica
115:.
87:by
21:PKP
227::
166:^
98:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.