Continuous testing device for water pipe

Details Continuous testing device for water pipe Continuous testing device for water pipe

2002-06-12

2003-09-16

Lefkowitz, Edward (Department: 2855)

Measuring and testing

With fluid pressure

Pipe

C073S049500, C073S049100

Reexamination Certificate

active

06619104

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a continuous testing device for a water pipe, particularly to a continuous testing device for detecting volume changes due to axial pressure.
2. Description of Related Art
For manufacturing of flexible pipes, appropriate material for practical use needs to be employed. Testing of material samples is performed to ensure that requirements are met.
Flexible pipes are produced in various sizes, having inner diameters of up to 4000 mm. With water pressure in practice reaching 20 kg/cm
2
, axial forces on water pipes are as large as thousands of tons, and large mechanisms (usually oil pressure cylinders) are required to overcome axial pressure. Testing of flexible pipes for expansion, deflection and eccentricity under pressure is fraught with difficulties, since high water pressure readily leads to changes of length and volume. Due to the incompressibility of liquid, a small volume change immediately leads to a large pressure change, and a stable condition cannot be achieved. Therefore, if there is no way to release or refill water, testing data of flexible pipes will turn out to be faulty, and the testing process will have to be stopped.
A conventional testing device for a flexible pipe used in manufacturing plants, as shown in
FIG. 2
, comprises: a frame
100
, carrying mechanical weight; a fixed plate
101
; a movable plate
102
, two joints
106
; two horizontal oil pressure cylinders
104
; and a vertical oil pressure cylinder
105
. The fixed plate
101
is mounted on one end of the frame
100
, providing a fixed base for testing shifts of a flexible pipe section
107
, and has two canals leading to the flexible pipe section
107
to which an inlet
101
a
and an outlet
101
b
are respectively connected for applying pressure. The two horizontal joints
106
are connected with an upper end and a lower end of the fixed plate
101
, respectively, having far ends connected with the movable plate
102
, with threaded bolts
103
passing through the movable plate
102
serving to adjust holding forces. The two horizontal oil pressure cylinders
104
are connected with the upper and lower ends of the fixed end plate
101
, respectively, exerting horizontal force on the movable plate
102
. The vertical oil pressure cylinder
105
is set on a movable base
108
on the frame
100
, applying vertical force on the movable plate
102
.
During testing, the flexible pipe section
107
needs to withstand a large axial force. For the joints
106
and threaded bolts
103
carrying the axial load, water is let out of the flexible pipe and nuts
103
a
on the adjusting threaded bolts
103
are turned by a preset degree. Then water is through the inlet
101
a
filled into the flexible pipe. During filling, changes of length and shifting of the flexible pipe section
107
are sensed. However, since the nuts
103
a
on the threaded bolts
103
determine a fixed state, there is no way continually to monitor shifting of the tested pipe section
107
. Thus several measurements require repeated adjusting of the nuts
103
a
on the threaded bolts
103
, which is not a realistic test of the tested pipe section
107
. In real use, the tested pipe section
107
undergoes continuous change of pressure. Therefore, conventional testing does not reveal real properties of the tested pipe section
107
.
Above explanation shows that a conventional testing device for a water pipe has the following shortcomings:
1. Only discontinuous, static monitoring is possible, no continuous changes of pressure are simulated.
2. Testing in several steps is time-consuming and cumbersome.
3. Test data do not correspond to the behavior of the tested pipe and are imprecise, not providing a solid base for judging the properties of tested pipes.
4. Tests have a high rate of failure, wasting cost and effort.
SUMMARY OF THE INVENTION
It is the main object of the present invention to provide a continuous testing device for a water pipe allowing safe testing at low cost.
Another object of the present invention is to provide a continuous testing device for a water pipe for precise testing with reliable data.


REFERENCES:
patent: 4182160 (1980-01-01), Powers et al.
patent: 4211107 (1980-07-01), Sleeter et al.
patent: 4416147 (1983-11-01), Hasha
patent: 4586379 (1986-05-01), Burkhardt, Jr.
patent: 4858464 (1989-08-01), Miller et al.

Affiliated with

Also associated with

Rating

Continuous testing device for water pipe does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Continuous testing device for water pipe, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Continuous testing device for water pipe will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3079308