JPH0210893B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for performing hydraulic pressure tests on pressure vessels, heat exchangers, and the like.

FIG. 1 shows a conventional water pressure testing apparatus for testing boilers for thermal power generation.

The water pressure test water 2 stored in the tank 1 is transferred to the boiler main body inlet valve 7 by piping 3 and water pump 4.
Water supply valve 5 with outlet valve 10, deaerator inlet valve 8, outlet valve 11, reheater inlet valve 9, and outlet valve 12 open.
a, the boiler main body 1 via the water supply pipe 6 and the water supply valve 5b
3. Fill the deaerator 14 and reheater 15 with water pressure test water 2 until they are full. When the water is full, close the outlet valves 10, 11, 12 of the boiler main body 13, deaerator 14, and reheater 15, and close the bypass pipe 1.
6. Increase the pressure to the specified pressure using the pressurizing pump 18 via the bypass valve 17.

At this time, it is widely known that the presence of dissolved oxygen in the hydraulic test water 2 has a great negative effect on the corrosion of metals, and the following method is generally used as a measure to prevent metal corrosion.

(1) A method in which water pressure test water is deoxidized by heating before use.

(2) A method in which water pressure test water is deoxidized by aeration with an inert gas such as nitrogen before use.

(3) A method in which water pressure test water is deoxidized beforehand using chemicals such as sodium sulfite or hydrazine.

(4) A method in which an anticorrosive agent is added to the hydraulic test water in advance.

(5) A method in which the hydraulic test water containing dissolved oxygen is used as is, but corrosion is prevented by shortening the hydraulic test time.

However, the above method has the following drawbacks.

(1) The thermal deoxidation method uses high-temperature, high-pressure water to deoxidize, so the equipment must be designed to withstand pressure and become larger. Additionally, high-temperature, high-pressure water generation equipment is required.

(2) The deoxygenation method using inert gas aeration requires a large amount of high-purity aeration gas with low oxygen content, which increases running costs.

(3) The method of deoxidizing using chemicals requires a large amount of chemicals unless either method (1) or (2) above is used in combination.

In addition, running costs increase because waste liquid treatment is required when discharging the water pressure test water at the end of the water pressure test.

(4) The method of using an anticorrosive agent, like the method (3) above, requires a large amount of chemicals and also requires waste liquid treatment, which increases running costs.

(5) Methods that shorten the water pressure time can suppress metal corrosion to some extent, but corrosion cannot be avoided.

The present invention eliminates these drawbacks, and provides a water pressure testing device comprising a tank for storing water, a water tension pump and a pressure pump for supplying and pressurizing the water in the tank into the test subject. The feature is that an activated carbon-packed tower filled with activated carbon is installed on the outlet side of the water tension pump and pressure pump, and its purpose is to effectively remove dissolved oxygen in the water pressure test water used for water pressure tests. The present invention provides a water pressure testing device that can perform a water pressure test by supplying water to a test object.

Hereinafter, the present invention will be described with reference to an embodiment shown in FIG. 2, but the structures and functions of the components having the same reference numerals as in FIG. 1 are the same, so the explanation will be omitted.

Reference numeral 20 denotes a bypass pipe line that is arranged in parallel with the water supply pipe 6 and bypasses the water supply valve 5b, and includes valves 21a,
Activated carbon packed towers 21 are interposed which are opened and closed at the front and rear by means of 21b.

Therefore, in a hydraulic test in which corrosion is not an issue, the hydraulic test water 2 is supplied through the water supply valve 56, but a hydraulic test using the activated carbon packed tower 21 is conducted as follows.

Hydraulic test water 2 containing dissolved oxygen stored in tank 1 passes through piping 3 to water supply valve 5a, water supply pipe 6, and valve 2.
Water is sent to an activated carbon-packed tower 21 installed in a bypass pipe 20 via a water pump 4 via 1a. At this time, dissolved oxygen in the hydraulic test water 2 is adsorbed and removed by contacting the activated carbon in the activated carbon packed tower 21.

The hydraulic test water from which dissolved oxygen has been removed in the activated carbon packed tower 21 is used to fill the boiler main body 13, deaerator 14, and reheater 15 with water via the valve 21b, as in the conventional method. The water pressure test water from which dissolved oxygen has been removed contains dissolved oxygen again when it comes into contact with the air in the system. , the water pressure test water 2 is discharged outside the system until the dissolved oxygen concentration in the water pressure test water 2 decreases. This simultaneously cleans any dirt that may have adhered to the system.

If the dissolved oxygen concentration in the water pressure test water 2 discharged outside the system decreases, the boiler main outlet valve 10,
The deaerator outlet valve 11 and the reheater outlet valve 12 are closed, and the water pump 4 is stopped.

Next, the water pressure test water 2 is sent to the activated carbon packed tower 21 by the pressurizing pump 18 via the bypass valve 17, the bypass pipe line 16, and the valve 21a, and dissolved oxygen is adsorbed and removed by the activated carbon. Pressure pump 1
Increase the pressure at step 8 and perform a water pressure test.

In this way, the boiler body 13 which is the test object
When the water pressure test water 2 is supplied and pressurized, the water pressure test water 2 contains almost no oxygen, and corrosion can be prevented.

Note that coconut shell activated carbon can be used as the activated carbon to be filled in the activated carbon packed tower 21, and its characteristics are as follows.

Activated carbon 2 Dissolved oxygen at the inlet 10ppm At the outlet 〃 0.01ppm or less Water flow rate 10/H Amount collected 820 Also, when the above activated carbon is regenerated with steam, the amount collected is 800, which is a high regeneration rate of 97% and is sufficient to withstand repeated use. This also reduces running costs.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a conventional water pressure testing apparatus, and FIG. 2 is an explanatory diagram of an apparatus showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...tank, 2...hydraulic test water, 4...water tension pump, 13...boiler main body, 18...pressure pump, 21...activator packed tower.

Claims (1)

[Claims] 1. In a hydraulic test device consisting of a tank for storing water, a water tension pump and a pressure pump for supplying and pressurizing the water in the tank into the test subject, an activated carbon-filled tower filled with activated carbon is connected to the water tension pump, A water pressure testing device characterized by being installed on the outlet side of a pressurizing pump.