WB Equipment Inc. - Supplier of Hydraulic and Pneumatic Jacking Systems for Jacking, Hoisting, Lifting & Moving. Tel: 866-522-5464
RENTALS • SALES • SERVICE
 
 

FLAT JACK SELECTION CHART

Flat Jack Rentals

Back to the Flat Jacks page


Custom hydraulic systems designed to raise or lower any type of structure.
Give our engineers a call to discuss your applications.

RENTALS • SALES • SERVICE

Model
Number
Thrust at
max pressure
(150 bar)
Capsule
diameter
Thrust plate
diameter
Closed
height
Maximum
stroke
Required
access gap
Flat jack
component wt
Maximum
inflation
volume
Capsule
Thrust Plates
tonnes
kips
mm
inches
mm
ins
mm
ins
mm
ins
mm
ins
kg
kg
litres
12
8
17
120
4.7
70
2.8
32
1.3
25
1
38
1.5
0.5
0.7
0.2
15
15
30
150
5.9
100
3.9
32
1.3
25
1
38
1.5
0.8
1.3
0.5
22
37.5
80
220
8.7
170
6.7
32
1.3
25
1
38
1.5
1.5
4.0
1.0
25
50
112
250
9.8
200
7.9
32
1.3
25
1
38
1.5
1.8
5.9
1.4
27
60
132
270
10.6
220
8.7
32
1.3
25
1
38
1.5
2.1
7.0
1.6
30
80
174
300
11.8
250
9.8
32
1.3
25
1
38
1.5
2.5
9.0
2.0
35
101
240
350
13.8
300
11.8
32
1.3
25
1
38
1.5
3.4
13.2
2.6
42
160
378
420
16.5
370
14.6
32
1.3
25
1
38
1.5
4.7
19.2
3.8
48
215
500
480
18.9
430
16.9
32
1.3
25
1
38
1.5
6.0
29.0
5.0
60
346
836
600
23.6
550
21.7
32
1.3
25
1
38
1.5
8.2
45.7
7.8
75
560
1360
750
29.5
700
27.6
32
1.3
25
1
38
1.5
11.0
70.3
12.4
87
764
1860
870
34.2
820
32.3
32
1.3
25
1
38
1.5
13.3
97.8
16.7
92
868
2130
920
36.2
870
34.3
32
1.3
25
1
38
1.5
14.3
110.5
18.7

Sizes beyond this range may be available by special order.

Detailing Guidelines

Bearing Area - The whole surface of the flat jack thrust plate must bear upon a jacking surface.  Local stiffening, distribution steel or concrete may be necessary.

Access Gaps - The selection chart shows the thickness and minimum access gap requirements which must be provided.  If the full travel of the jack is required then packing shims must be fitted to fill any remaining space before inflation.

Tandem Jacks - Where the required jacking distance exceeds the travel of a single jack they may be stacked one on top of another and then inflated in sequence.  Only the larger sizes of flat jacks may be stacked more than two high.

Sheer Resistance - Flat jacks must not be subjected to shear loads.  Where necessary the flat jack must be protected from shear forces by housing in a shear box or by another means.

Inlet/Vent Positioning - Flat jacks can be made with suitable inlet positions where access is especially difficult.

Oil-Resin Transfusion Jacks - When jacks are to be oil inflated and later transfused with epoxy resin, they are manufactured with an internal pipe to ensure satisfactory oil displacement. 
This requirement should be specified at the time of detailing.

Safety Packs - It is frequently adviseable to make provision for safety packs when temporary oil flat jacks are intended to be in position for extended periods and at risk from mechanical damage from other activities in the jacking area

   
 
W.B. Equipment Service Company, Inc. ▪ Tel: 866-522-5464 ▪ Fax: 201-438-7830 ▪ E-Mail: info@wbequipment.com