Pneumatic pipe inspection device

• US 4,646,787 A
• Filed: 03/18/1985
• Issued: 03/03/1987
• Est. Priority Date: 03/18/1985
• Status: Expired due to Fees

• Current Assignee: Institute Of Gas Technology (GTI Energy)
• Original Assignee: Institute Of Gas Technology (GTI Energy)
• Inventors: Rush, William F., Ziolkowski, Christopher J., Huebler, James E.
• Primary Examiner(s): Levy, Stewart J.
• Assistant Examiner(s): NOLAND, THOMAS
• Application Number:
  US06/712,789
• Time in Patent Office: 715 Days
• Field of Search: 73/432 G, 73/432 B, 73/432 R, 73/623, 73/40.5 R, 138/93, 138/90, 138/97, 324/220, 358/100, 358/98, 358/107, 378/60, 33/125 B, 33/302, 33/1 H, 33/141 G, 33/529, 105/365, 104/138 R, 104/138 G, 104/287, 104/295, 104/296, 104/297, 104/154, 104/155, 104/156
• US Class Current: 138/98
• CPC Class Codes: F16L 55/34 the pig or mole being moved step by step
• CPC Class Codes: G01M 3/005 using pigs or moles G01M3/246, G01M3/2823 take precedence

Abstract

A pipe worm comprises radially inflatable toroids spaced along an axially inflatable tubular body. The worm inches through piping through sequential inflation and deflation of the toroids and tubular body. The worm includes a fluid supply source, pipe maintenance instrumentation and automatic, semiautomatic or manual controls which are remote, on-board or trailered, as desired. The worm is inexpensive, reliable, capable of turning 90 degree corners, and further uniquely advantageous.

Claims

1. A pipe worm comprising:

an axially expandable and retractable first body; and

a pair of radially expandable and retractable second bodies mounted axially spaced along the first body;

all the bodies being fluid inflatable to be expandable through fluid inflation and being fluid deflatable to be retractable through fluid deflation; and

further comprising means for controlling all the bodies for automatically causing the following sequentially ordered series of steps;

expansion of one of the second bodies, retraction of the other of the second bodies, expansion of the first body, expansion of the other of the second bodies, retraction of the one of the second bodies, and retraction of the first body.

2. A pipe worm as in claim 1 in which the first body defines an open passage through the worm, the worm thereby providing flow through a pipe with the worm present in the pipe.

3. A pipe worm as in claim 1 in which the first body comprises two end-joined, concentric, axially flexible cylinders.

4. A pipe worm as in claim 3 in which the cylinders are formed of rubber.

5. A pipe worm as in claim 1 in which the second bodies comprise toroids.

6. A pipe worm as in claim 5 in which the toroids are formed of rubber.

7. A fluid inflatable pipe worm for maintenance of piping comprising:

a first body formed with two end-joined, concentric, axially flexible, expandable and retractable cylinders defining a first body inflation compartment therebetween, the first body being inflatable through the introduction of fluid into the first body inflation compartment for axially expanding the cylinders, and being deflatable through exhaustion of fluid from the first body inflation compartment for axially retracting the cylinders;

a pair of second bodies formed with radially flexible, expandable and retractable toroids mounted axially spaced along the exterior of the first body and defining a toroidal inflation compartment, the second bodies being inflatable through the introduction of fluid into the toroidal inflation compartments for radially expanding the toroids, and being deflatable through exhaustion of fluid from the toroidal inflation compartments for radially retracting the toroids; and

valving operatively connecting to the first inflation compartment and the toroidal inflation compartments for selective inflation and deflation of the inflation compartments;

the pipe worm being sized for axial placement within the piping and for worm securing contact of the second bodies within the piping during inflation of the toroidal inflation compartments; and

the pipe worm being movable within the piping by moving through repeatedly performing the following series of steps;

(a) introduction of fluid through the valving into one of the toroidal inflation compartments causing inflation of one of the second bodies into worm securing contact within the piping, (b) exhaustion of fluid through the valving from the other of the toroidal inflation compartments, causing deflation of the other of the second bodies if inflated, and its ceasing worm-securing contact, (c) introduction of fluid through the valving into the first body inflation compartment causing inflation of the first body and axial movement of the other of the second bodies away from the one of the second bodies, (d) introduction of fluid through the valving into the other of the toroidal inflation compartments causing inflation of the other of the second bodies into worm securing contact within the piping, (e) exhaustion of fluid through the valve from within the one toroidal inflation compartment causing deflation of the one second body and ceasing worm-securing contact of the one second body, within the piping, (f) exhaustion of fluid through the valving from within the first body inflation compartment causing deflation of the first body and axial movement of the one second body toward the other of the second bodies.

8. A fluid inflatable pipe worm for maintenance of piping comprising:

a tubular body formed with two end-joined, concentric axially flexible, expandable and retractable cylinders defining a tubular inflatable compartment therebetween, the tubular body being inflatable through the introduction of fluid into the tubular inflation compartment for axially expanding the cylinders, and being deflatable through exhaustion of fluid from the tubular inflation compartment for axially retracting the cylinders;

a pair of radially flexible, expandable and retractable toroids mounted axially spaced along the exterior of the tubular body and each defining a toroidal inflation compartment, the toroids being inflatable through the introduction of fluid into the toroidal inflation compartments for radially expanding the toroids, and being deflatable through exhaustion of fluid from the toroidal inflation compartments for radially retracting the toroids; and

valving operatively connecting to the tubular inflation compartment and the toroidal inflation compartments for selective inflation and deflation of the inflation compartments;

the pipe worm being sized for axial placement within the piping and for worm securing contact of the toroids within the piping during inflation of the toroidal inflation compartments; and

the pipe worm being movable within the piping by moving through repeatedly performing the following series of steps;

(a) introduction of fluid through the valving into a first one of the toroidal inflation compartments causing inflation of a first of the two toroids into worm securing contact within the piping, (b) exhaustion of fluid through the valve from a second of the toroidal inflation compartments, causing deflation of the second toroid if inflated, and ceasing worm-securing contact of the second toroid, (c) introduction of fluid through the valving into the tubular inflation compartment causing inflation of the tubular body and axial movement of the second toroid away from the first toroid, (d) introduction of fluid through the valving into the second toroidal inflation compartments causing inflation of the second toroid into worm securing contact within the piping, (e) exhaustion of fluid through the valving from within the first toroidal inflation compartment causing deflation of the first toroid and ceasing worm-securing contact of the first toroid within the piping, (f) exhaustion of fluid through the valving from within the tubular inflation compartment causing deflation of the tubular body and axial movement of the first toroid toward the second toroid.

9. A fluid inflatable pipe worm as in claim 8 further comprising:

fluid supply means for supplying fluid to the valving; and

control means for controlling the fluid supply means and valving for controlled movement of the pipe worm.

10. A fluid inflatable pipe worm as in claim 9 in which the valving, fluid supply means and control means are mounted to the pipe worm for movement with the pipe worm within the piping.

11. A fluid inflatable pipe worm as in claim 8 in which the inflation compartments are pneumatic compartments and the pipe worm is a pneumatic pipe worm.

12. A fluid inflatable pipe worm as in claim 8, the tubular body and toroids and piping axially between the toroids defining, when the toroids are inflated, a leak stopping inflation compartment, the valving operatively connected to the leak stopping inflation compartment, whereby the pipe worm is positionable and the leak stopping inflation compartment inflatable for stopping leaks in the piping axially between the toroids.