1A-12
U.S. Navy Diving Manual—Volume 1
Table 1A-3. Wet Suit Un-Hooded.
Permissible Exposure Limit (PEL) within a 24-hour period for exposure to AN/SQS-23, -26, -53, -56,
AN/BSY-1, -2 and AN/BQQ-5 sonars, including versions and upgrades. Exposure conditions shown
above the double line should be avoided except in cases of compelling operational necessity.
Estimated Ranges in yards for given SPL and PEL for sonar.
All ranges and SPLs are nominal.
*SPL is measured in dB/1 mPA at the dive site. To convert SPL for sound levels referenced to mbar,
subtract 100 dB from tabled levels.
(U) = upgrade
SPL
(dB)
PEL
(MIN)
BSY-1
SQS-53C
BQQ-5
BSY-2
SQS-26CX(U)
SQS-53A, SQS-53B
SQS-56(U)
SQS-23
SQS-26AX
SQS-26BX, SQS-26CX
SQS-56
200
199
198
197
196
195
194
193
192
191
13
15
18
21
25
30
36
42
50
60
316
355
398
447
501
562
631
708
794
891
224
251
282
316
355
398
447
501
562
631
71
79
89
100
112
126
141
158
178
200
A
V E
O X
I
P
D O
S
T U
H R
I
E
S
190
189
188
187
186
185
184
183
182
181
180
179
178
177
176
175
71
85
101
120
143
170
202
240
285
339
404
480
571
679
807
960
1,000
1,122
1,259
1,413
1,585
1,778
1,995
2,239
2,512
2,818
3,162
3,548
3,981
4,467
5,012
5,623
708
794
891
1,000
1,122
1,259
1,413
1,585
1,778
1,995
2,239
2,512
2,818
3,162
3,548
3,981
224
251
282
316
355
398
447
501
562
631
708
794
891
1,000
1,122
1,259
