JPS6040895A - Method of controlling fluid transport pipe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a pipe 8 for transporting fluids that are prone to depositing scale, such as geothermal water, mineral springs, hard water, salt water solutions, etc. Regarding the law.

[Prior art]

Conventionally, iron pipes, steel pipes, F It
After being used for a short period of time, scale adhered to the inner wall of the pipe, making fluid transport virtually impossible, and it was no longer necessary to purchase new pipes each time. Generally, purchasing new pipes requires a large amount of money and time.

[Summary and effects of the present invention]

As shown in the above claims, even if a large amount of scale adheres to the inner wall of the water-crosslinked polyethylene pipe, the limb canal is not subjected to mechanical shock from the outside of the pipe, such as by applying light/dry blows. If 4 is insufficient, the scale will easily peel off.

[Further detailed description of the invention]

Water-crosslinked polyethylene pipes are pipes that can be crosslinked with water or are made of polyethylene that has been crosslinked with water.

The polyethylene may be obtained by grafting polyethylene with an organic group that can be hydrolyzed and crosslinked with water using an organic unsaturated compound such as vinyltrimethoxy7-norane and a radical generator such as cumyl peroxide, or by grafting polyethylene with an organic group that can be crosslinked by hydrolyzing it with water. A copolymer with a small amount of an organic unsaturated compound such as vinyltrimethoquinonelan is used. Those water-crosslinking compounds may contain ethylene/ranol condensation catalysts known as water-crosslinking promoters, such as dibutyltin disiurate.

In the present invention, a pipe made of uncrosslinked polyethylene that can be crosslinked with water may be used.

This is because the limbs are cross-linked with water during practical use and are transformed into cross-linked polyethylene.

Mechanical shock to the limbs to peel off and remove scale that has built up on the inner wall of water-crosslinked polyethylene can be applied by gently tapping the outer surface of the pipe with your hand, mallet, etc., applying vibration to the pipe, or Other methods are fine.

When a water-crosslinked polyethylene pipe for pumping up mineral spring water that is inserted vertically deep underground is touched by hand or mechanical vibration is applied to the part of the pipe that protrudes from the surface, the scale that adheres to the inner wall of the pipe becomes y. All of it peels off and falls off.

For vertical pipes with an open bottom, the scale that has peeled off will fall off by itself, or for horizontal pipes, it is best to periodically stop fluid transport, disconnect the pipe connection, and peel off the scale to remove the scale that has accumulated on the bottom of the pipe.

[Experimental example showing the effects of the present invention] When a water-crosslinked polyethylene pipe with a length of 10 m, an outer diameter of 50 mm, and a wall thickness of 5 mm was looped and 80°C sulfur spring water was continuously passed through it for 5 months, the entire inner wall of the pipe was There was scale about 2 feathers thick attached to the tube.706 Next, I stopped the water flow and ran the entire length of the pipe by hand from the outside, and found that 9 of the scale had adhered to it.
It peeled off in a short period of time, or less than 8%.

Water-crosslinked polyethylene pipes with an outer diameter of 165 mm and a wall thickness of 15+ nm were used to transport geothermal water at 98°C containing 3000 ppm of silicic acid components for 6 months II! ! When water was subsequently passed through the tube, a scale of approximately 5.5 mm was attached to the entire surface of the inner layer of the tube. Remove the limb, hold it at an angle, and tap it with a hammer in order from the top to remove the attached scale.
Section 9 peeled off in about 10 minutes.

patent applicant Dainichi Nippon Electric Cable Co., Ltd. Representative Director + Yukio fyama

Claims (1)

[Claims] A method for managing fluid transport pipes, which is characterized in that a pipe that transports a fluid that tends to cause scale to adhere to the inner wall of the pipe is tied together with a water-crosslinked polyethylene pipe, and the attached scale is peeled off from the inner wall of the pipe by applying a mechanical shock to the limb pipe. .