Lining material for pipe lines

Details Lining material for pipe lines Lining material for pipe lines

1986-10-17

1988-02-09

Kittle, John E.

Stock material or miscellaneous articles

Hollow or container type article

Polymer or resin containing

428246, 138 98, 138124, 138125, F16L 5516

Patent

active

047241780

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Technical Field:
The present invention relates to a lining material for lining pipe lines, especially gas conduits, city water pipe lines and pipe lines for construction of power transmission wires or telecommunication cables, chiefly those buried in the ground, for the purpose of repair or reinforcement of the pipe lines.
2. Background Art:
In recent years, a method of applying a lining material onto the inner surface of city water pipe lines, gas conduits and construction pipe lines for power transmission wires or telecommunication cables is carried out for the purpose of repair or reinforcement of the pipe lines when superannuated. The method of applying a lining material is carried out in such manner that a flexible lining material in the form of a tube previously provided on the inner surface thereof with a binder is inserted into a pipe line and allowed to advance therein while turning the lining material inside out and pressing it against the inner surface of the pipe line under fluid pressure whereby the inner surface of the lining material is bonded onto the inner surface of the pipe line by the aid of the binder. According to this method, it is unnecessary to dig up a pipe line over its full length. The method has such merits that the lining work can be done within a short period of time for a long pipe line and is operable for a pipe line having a number of bends, thus being watched especially in recent years as a very excellent method.
As a lining material utilizable for this method should be flexible and air-impervious and is required to possess satisfactory strength in lengthwise and diametrical directions of the pipe line in consideration of any influence of creeping or earthquake occurring after lining, a tubular textile jacket having a film of a synthetic resin on the exterior surface thereof has hitherto been used as the lining material.
The filmy layer of the lining material is required to possess various characteristics such as flexibility, stretchability of a moderate degree and strength as well as good heat-resistance, abrasion-resistance and scratch-resistance.
In case of a lining material to be applied to city water pipe lines, a synthetic resin constituting the filmy layer should particularly be safe to the quality of water. A material utilizable for city water pipe lines is required to satisfy the specifications defined in individual countries, for example, those defined by the Japan Water Works Association (JWWA) in case of Japan. According to the specifications defined by JWWA, the material is required to satisfy the test for quality of water defined by ("Tar Epoxy Resin Paints for Water Works and Method of Coating " (K-115) wherein the specifications are defined in detail for turbidity, color scale, the amount of consumption of potassium permanganate, the amount of consumption of chlorine, etc. A synthetic resin of polyolefin series as well as a synthetic resin of fluorine series is specified as a resinous material forming the filmy layer of a lining material satisfying these specifications.
Of these synthetic resins, the fluorine resin is very expensive and inferior in extrusion characteristics so that it is not suited as a resinous material forming the filmy layer of a lining material for the pipe lines. Accordingly, the resinous materials for this application are substantially restricted to a synthetic resin of polyolefin series.
The synthetic resin of polyolefin series includes high density polyethylene-resin, medium density polyethylene resin, low density polyethylene resin, polypropylene resin, polybutene resin, etc. However, the resins other than low density polyethylene are inferior in flexibility, while the low density polyethylene is inferior in durability. Thus, these resins were not necessarily suitable as a material constituting the filmy layer of a lining material for pipe lines.
3. Prior Art:
The present inventors already devised as a lining material for city water pipe lines a material using a linear low density polyethylene resin

REFERENCES:
patent: 4368091 (1983-01-01), Ontsuga et al.
patent: 4576205 (1986-03-01), Mortinaga et al.
patent: 4600615 (1986-07-01), Hyodo et al.
patent: 4681783 (1987-07-01), Hyodo et al.
patent: 4684556 (1987-08-01), Ontsuga et al.

Affiliated with

Also associated with

Rating

Lining material for pipe lines does not yet have a rating. At this time, there are no reviews or comments for this patent.

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1283709