10-5/8 HYDRAULIC BACKUP
Model 02F10E
© AUGUST 20, 2013
PAGE 11
8.0 RELIEF VALVE ADJUSTMENTS
An adjustable relief valve is mounted on the top plate of the Backup that allows the amount of clamping
force placed on the tubular.
FIGURE 8.01: BACKUP RELIEF VALVES
The relief valves are factory set to 500 psi (3,447 kPa) for opening the Backup and to 2,500 psi (17,237
kPa) for closing. This should cover almost all applications and should not require any adjusting.
If the application requires more clamping pressure, adjust the relief valve. Ensure to adjust the correct
relief valve (refer to Figure 8.01). Adjust the relief valve as follows:
1. Loosen off the locking nut.
2. Slowly tighten the adjustment bolt. Ensure to test the maximum pressure on the Backup gauge
by either biting a tubular or allowing the jaws to close all the way.
3. Once desired pressure is attained, tighten the locking nut.
It should be noted that the as the torque on the Tong increases, it is normal to see the Backup pressure
increase.
The Graph below represents the Hydraulic Backup required pressures to hold some common tubular
diameters and should be used as a guide to optimize setting on the backup.
0
2500
5000
7500
10000
12500
15000
17500
20000
22500
25000
0
500
1000
1500
2000
2500
3000
3500
To
rque
(FT
.L
Bs)
Pressure (PSI)
Pressure Needed on 02F10E Backup
10.625
7
3.5
Sizes are in
inches.
For Pressure
of sizes not
shown use
next smaller
bite size on
chart.
PRESSURE ADJUSTMENT BOLT FOR
OPENING (RELEASING PRESSURE)
PRESSURE ADJUSTMENT BOLT
FOR CLOSING (BITING PRESSURE)
CONNECTION TO TONG
LOCKING NUT
