Table 1. 
Summarized results of field tests in various bottom sediments. 
Sediment type Vibrator Water depth Core length (cm) No. of 
Ball Piston Max.! Min. Avg. tests 
(mm) (in) (m) MS 
Sand 38 USE teey  Sho7/ NEY] 522 3.4 te? 18 
Sand 64 6.1 to 6.4 203.2 47.0 114.0 15 
Sand 3 LS) to 2.8 243.8 35.6 152.4 38 
Mud over clay 64 8.2 to 9.4 138.4 38.5 102.1 2 
Mud over clay 3 4.6 to 15.5 243.8 83.8 979) 27 
Sand over till 3 Diels CO) ) Blo 243.8 21.6 100.8 14 
Mud over till 64 Yod -_——- -—-- B08) 1 
Mud over till 3 6.4 to 10.4 243.8 31.8 148.8 15 
Mud over silt 64 Vos) tee oak 144.8 35.6 Yo) 5) 
Mud over silt 3 7.9) to) 158 243.8 146.1 191.0 4 
Mud with sand 38 9.4 Soe 33.0 49.3 3 
Mud with sand 64 825i 5 Ue eee ---—-- 72.4 al 
Mud with sand 3 4.6 to 15.2 243.8 24.1 188.0 17 
Silt with clay 38 3.4 to 11.3 243.8 4.0 87.9 13} 
Silt with clay 64 4.0 201.9 96.5 146.1 4 
Silt with clay 3 8.8 to 107 243.8 170.2 205.5 4 
Total 181 
ee 
lMaximum possible length is 243.8 centimeters. 
Table 2. 
Field results of comparison tests at two 
locations between 3-inch long-stroke 
piston vibrator and paired 64-millimeter 
ball vibrators. 
Vibrator 
Compressor 
required 
(m3 /min) 
Hoses 
Core length 
required 
(cm) 
Location 1 
Bottom material: 
Water depth: 
3-in piston 
64-mm ball 
sand 
6.4 meters 
Location 2 
silt and clay 
Bottom material: 
Water depth: 
3-in piston 
64-mm ball 
4.0 meters 
