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General
Information |
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Variable springs supports are
designed for supporting pipe work, vessels and pipe connections to large
tank.
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The word "variable" refers to the
fact that the load-carrying capacity of the spring varies considerably as
the spring is compressed or expanded from a fixed reference point. In other
words, as the pipe moves up, the spring is expanded and the load that it
exerts is decreased. The opposite effect is experienced when the pipe
moves down. In either case, the exerted load must not vary more than 25%
of the calculated load. |
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Recommended
Services |
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Install on pipeline subject to
- Thermal movement.
- Vertical movement not to exceed 3 inches
or 75 millimeters.
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Selecting
A Correct Spring |
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n order to manufacture a spring, the following data must be
known:
- Figure
- Size
- Type
- Operating load or Hot load
- Installed load or Cold load
- Movement and its direction
Since some of above data can be derived
from the others, therefore not all are needed. One of the below conditions
must be provided in order to manufacture a spring:
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| Condition |
Known |
Unknown |
| 1 |
Figure
No., Size, Hot load, Movement
& Direction |
Cold
load |
| 2 |
Figure
No., Size, Cold load, Movement & Direction |
Hot
load |
| 3 |
Hot
load, Movement & Direction |
Figure
No., Size, Cold load |
| 4 |
Cold
load, Movement & Direction |
Figure
No., Size, Hot load |
| 5 |
Hot
load, Cold Load & Spring rate |
Figure
No., Size & Movement |
| 6 |
Figure,
Size, Type |
Hot
load, Cold load, Movement & Spring rate |
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Note: Condition 6 is used to
obtain pricing only
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Go to "Ordering" |
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Spring
Types |
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| Drawing |
Rilco
Type |
Grinnell
Equivalent |
Description |
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A |
A |
A hanger-type support. Design for use where
headroom is unlimited. Top of spring housing is a rod which
allows the spring to attach to a support.
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B |
B |
A single-lug hanger support
type. Designed for use where headroom is limited. Top of spring housing
has a single lug to accommodate a double-lug beam attachment from
the top support. |
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C |
C |
A hanger-type support.
Designed for use where headroom is limited. Top of spring housing
has double lugs to accommodate a single-lug attachment from the top
support. |
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D |
D |
A hanger-type support.
Designed for use where variable spring hanger is positioned above
supporting structure with spring adjustment made from the top. |
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E |
E |
A hanger-type support.
Designed for use when spring adjustment must be below the structure
on which the spring housing is being supported. |
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F |
F |
A base-type support.
Designed for supporting piping from below |
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G |
G |
A hanger-type support. Designed
for use where headroom is limited or where an obstruction prohibits
the use of a single spring hanger. |
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Figure
Numbers and sizes |
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Rilco
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Grinnell
Equivalent |
Comment |
| Figure
Number |
Size |
Figure
Number |
Size |
| RVS-82 |
0
- 22 |
82 |
0
- 22 |
Painted
finish |
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RVS-C82 |
0
- 22 |
C82 |
0
- 22 |
Hot
Dip Galvanized finish |
| RVS-268 |
0
- 22 |
268 |
0
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22 |
Painted
finish |
| RVS-C268 |
0
- 22 |
C268 |
0
- 22 |
Hot
Dip Galvanized finish |
| RVS-98 |
0
- 22 |
98 |
0
- 22 |
Painted
finish |
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RVS-C98 |
0
- 22 |
C98 |
0
- 22 |
Hot
Dip Galvanized finish |
| RVS-3X |
0
- 22 |
Triple |
0
- 22 |
Hot
Dip Galvanized finish |
| RVS-4X |
0
- 22 |
Quad
truple |
0
- 22 |
Hot
Dip Galvanized finish |
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Load
Table |
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| Spring
Size |
Rod
Size (in.) |
Load (lb.) |
Spring Rate
(lb./in.) |
| Minimum |
Maximum |
RVS-82 |
RVS-268 |
RVS-98 |
RVS-3X |
RVS-4X |
| 0 |
1/2" |
50 |
88 |
30 |
15 |
7 |
5 |
4 |
| 1 |
74 |
126 |
42 |
21 |
10 |
7 |
5 |
| 2 |
95 |
162 |
54 |
27 |
13 |
9 |
7 |
| 3 |
123 |
210 |
70 |
35 |
17 |
12 |
9 |
| 4 |
165 |
282 |
94 |
47 |
23 |
16 |
12 |
| 5 |
221 |
378 |
126 |
63 |
31 |
21 |
16 |
| 6 |
5/8" |
294 |
504 |
168 |
84 |
42 |
28 |
21 |
| 7 |
392 |
672 |
224 |
112 |
56 |
37 |
28 |
| 8 |
525 |
900 |
300 |
150 |
75 |
50 |
38 |
| 9 |
3/4" |
700 |
1200 |
400 |
200 |
100 |
67 |
50 |
| 10 |
910 |
1560 |
520 |
260 |
130 |
87 |
65 |
| 11 |
1190 |
2024 |
680 |
340 |
170 |
113 |
85 |
| 12 |
1" |
1575 |
2700 |
900 |
450 |
225 |
150 |
113 |
| 13 |
2100 |
3600 |
1200 |
600 |
300 |
200 |
150 |
| 14 |
1
1/4" |
2800 |
4800 |
1600 |
800 |
400 |
267 |
200 |
| 15 |
3780 |
6480 |
2160 |
1080 |
540 |
360 |
270 |
| 16 |
1
1/2" |
5250 |
9000 |
3000 |
1500 |
750 |
500 |
375 |
| 17 |
1
3/4" |
7000 |
12000 |
4000 |
2000 |
1000 |
667 |
500 |
| 18 |
2" |
9320 |
15970 |
5320 |
2660 |
1330 |
887 |
665 |
| 19 |
2
1/4" |
12380 |
21230 |
7080 |
3540 |
1770 |
1180 |
885 |
| 20 |
2
1/2" |
16450 |
28200 |
9400 |
4700 |
2350 |
1567 |
1175 |
| 21 |
2
3/4" |
21875 |
37500 |
12500 |
6250 |
3125 |
2083 |
1563 |
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22 |
3" |
29173 |
50010 |
16670 |
8335 |
4167 |
2778 |
2034 |
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Specifications |
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| Component |
Rilco
Standard? |
Description/Comment |
| Coil |
Yes |
Neoprene or powder coated
& designed per MSS-SP58 |
| Travel
stops |
Yes |
Hydrostatic
& Upper stops are standard |
| Metal
name plate |
Yes |
Stainless steel etched
with client tag, Rilco figure number, size, type hot load, cold
load, spring rate & movement. Loads and movements available in
imperial or metric unit. |
| Guided
load column (Type F only) |
No |
Specify
guided load column when required. |
| Lifting
lugs |
No |
Recommended
for spring weighs more than 100 lbs. or 45 kg. |
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Go to "Ordering" |
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Finish |
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Finish or coasting on the spring
housing is depend upon the environment in which the springs are installed.
Possible finishes are Painted (Black), Galvanized, or Hot Dip Galvanized.
Customer may request for a different paint color. |
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Go to "Ordering" |
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Terminologies |
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| Spring Figure |
Categorized
by spring rate |
| Spring Size |
Categorized
by load range |
| Spring Type |
Categorized
by physical shape. |
| Hot load / Hot setting
/ Operating load |
The
weight that the spring has to support while the pipe line system is
in operation. This is also called Operating load.. |
| Cold load / Cold setting
/ Installed load |
the
weight that the spring has to support while the pipe line system is
NOT in operation. This is also called pre-set load. |
| Movement / Travel |
The
measure of a vertical travel distance of the pipe location which is
supported by the spring when the pipe line is in operation. |
| Movement / Travel direction |
The
movement direction, either UP or DOWN of the pipe while in operation
compare to its resting point (not in operation). |
| Spring rate |
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| Hydro-tested load |
The test
which determines whether the spring will support the operating load. |
| Travel stops |
Limit
the spring travel at the top and bottom to a small percentage beyond
the specified range. In addition, they prevent the spring form
moving while the spring is not in operation (in pre-set mode) or in hydrostatic
testing phrase. |
| Load flange |
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| Variability |
The
amount of supporting load variation on horizontal piping. The
percentage variability should not exceed 25%. |
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Formulas
And Calculations |
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| Upward
movement
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If Cold
load is greater than Hot load
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| Downward
movement
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If Hot
load is greater than Cold load
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| Movement
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= (Cold
load - Hot load) / Spring rate.
If
result > 0 then movement direction is up. Otherwise, it's down.
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| Variability
(% load change)
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=
((Movement x Spring rate) / Hot load) x 100
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Ordering |
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The following must be provided
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Frequently
Asked Questions |
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- When do I have to order
non-standard components?
- What technical information do I need to provide Rilco in order to get a quotation?
- How do I determine
spring type?
- How do I determine
spring size?
- Can I provide
figure/part number that are not Grinnell's?
- When should I use hot
dip galvanized finish?
- When do I need lifting
lugs?
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