One: the choice of eye wash and shower equipment When selecting eye wash or shower equipment, in addition to considering the environmental factors of the site use, we must also consider the standard and technical requirements that the eye wash or shower equipment itself should meet, as well as the equipment After-sales service and equipment safety performance.

Due to the special requirements of eyewash and shower equipment, there will be some corresponding regulations for the materials of the equipment. At present, in the domestic market, the eyewash and shower heads of imported eye wash and shower equipment are generally made of ABS material, and the other parts are stainless steel or copper tube surface impregnated ABS material: domestic eye wash and shower equipment are generally resistant to corrosion. Excellent performance, not easy to rust, non-toxic stainless steel material, and durable. In cold weather in the north, consider installing antifreeze devices, or other requirements: for example, installing lighting equipment.

Second: the installation of eye wash and shower equipment.
1. Installation requirements are in accordance with ANSI Z358-1-2004 US Eyewash Standards. Installation of eyewash and shower equipment is to be carried out in accordance with the relevant instructions for use.

1.1 Eye wash and shower equipment should be installed near the source of danger. It is best to reach the range of eye wash and shower equipment within 10 seconds, and install it on the same level as much as possible. Arrive and avoid the ambulance.

1.2 There are eye-catching signs around the eye wash and shower equipment. The logo is best expressed in both Chinese and English and graphically, and it is very vivid to tell the operator at the production site the location and use of the eyewash and shower equipment.

1.3 Eyewash and shower equipment In normal operation, each component should meet the requirements of the ANSI Z358-1-2004 standard, and each nozzle can be used separately at the same time. In areas where there is a possibility of freezing in the north, antifreeze devices need to be added or anti-freeze protection facilities should be installed next to the equipment.

When the various parts of the eye wash and shower equipment are installed, the following requirements should also be met:
a. In the case where the eye wash and shower equipment are properly connected to the water source and all valve switches are closed, the connected piping should not leak.
b. All the valves must be kept normally open when the operating switches of the eye washer and the shower device are fully open, except for human factors.
c. When all switches of the equipment are in full operation, the entire equipment should meet the requirements of the ANSI Z358-1-2004 standard.

2. Requirements for installation position of eye wash and shower equipment 2.1 Eye wash and shower equipment should be installed near the source of danger, preferably within a short period of 10 seconds to reach the area of ​​the eye wash and shower equipment. At the same time, try to install on the same level, it is best to reach in a straight line, avoiding the ambulance.

2.2 In special cases, eyewash and shower equipment should meet special requirements. For example, in some environments where direct contact with strong acids or bases, or other toxic and hazardous substances that are highly corrosive or easily absorbed by the skin, eyewash and shower equipment must be installed closest to the source of the hazard.

2.3 In laboratories exposed to the above-mentioned toxic and hazardous chemicals, eyewash and shower equipment are generally installed in the internal passage of the laboratory. However, sometimes the location of the work is far from the eye wash device and the shower device, which may delay the rescue time. In this case, it is recommended to install hoses for eyewash and shower equipment next to the pool in the laboratory. This kind of equipment is convenient and practical. When the eyes, face and other parts are accidentally splashed into dangerous chemicals, they can be flushed with this equipment as soon as possible, providing timely protection.

Three: the water outlet speed of the eye wash device and the shower device.

The water outlet speed of eyewash and shower equipment should be as stable and balanced as possible. The water sprayed from the nozzle should be soft and present in a water mist state to prevent the water from flowing too much. This will not only increase the flushing area, but also avoid the unpleasant feeling of the water flowing too quickly.
The water flow of the shower is generally based on the specific emergency equipment. According to the ANSI Z358-1-2004 standard, the water flow rate needs to pass the 15min test.

Specific requirements are as follows:
Separate emergency showers, shower heads need to ensure a minimum water flow rate of 75.7L / min (20 gallons min), and the system can continue to supply water for more than 15min

Separate emergency eye wash, the water flow speed is relatively lower, the minimum must be no less than 1.5L / min (0.4 gallons min) and the system can be continuously supplied for more than 15min.

The eyewash system of the compound eye washer has a water flow speed of at least 11.4 L/min (3.0 gallons min), and the system can continuously supply water for more than 15 minutes.
The requirements for water pressure shall not be lower than 206.84 kPa. At present, domestic water sources can basically meet this requirement.

There should be a dust cover on each of the nozzles of the eye washer. When using the eyewash, the water will automatically flush the dust cover. The dust cover is attached to the eyewash by a stainless steel wire chain. When the eye wash device is not in use, the dust cover should be placed on the spray head to ensure that the nozzle of the eye wash device is not blocked by dust or other substances. The valve of the eye washer should be easy to operate and the opening time should not exceed 1 s. The valve should have anti-corrosion function. Since the nozzle of the eye wash is equipped with a filter, the debris in the water is prevented from causing damage to the human eye.

Four: the temperature of the effluent

According to the ANSI Z358-1-2004 standard, the water temperature of the eye wash and shower equipment should be lukewarm and the human body feels comfortable. However, if the temperature of hot water will promote or accelerate the chemical reaction between some substances in the water and the human body, you should refer to the advice of medical experts to ensure the most suitable temperature, and the water temperature can not change too much, or it will cause greater damage to the human body. hurt.

To ensure that the temperature of the water from the eye wash and the shower is constant, the manufacture and installation of the equipment adds significant difficulty. The easiest way is to divide the water supply into cold water and hot water systems, and then install a composite valve to bring the water temperature after compounding to normal. However, when using this system, it is very troublesome. In the event of an emergency, there is no more time to adjust the water temperature.

Five: treatment of wastewater

Although the wastewater treatment regulations are not mentioned in the ANSI Z358-1-2004 standard, designers and users must consider this problem, especially not causing secondary pollution or other damage.

In general, eyewash and shower devices are designed to be connected to the sewer. However, sometimes the washed wastewater contains some chemicals that may enter the public system. This requires the wastewater to be neutralized by acid and alkali before the wastewater enters the public system, to meet national standards before it can be discharged.

Six: maintenance, overhaul and training

It is recommended that eyewash and shower equipment be activated at least once a week to see if it works. For portable eye washes (such as portable eye wash, portable pressure eye wash), it is necessary to arrange for a person to check the reserve water source daily.

At the same time, it is recommended that the reserve water source be replaced once a day to ensure water quality.

An annual inspection of the eye wash and shower equipment is required to see if the equipment is in good condition.

For the maintenance and overhaul of eye wash and shower equipment, the manufacturer shall provide corresponding technical training. For users who have been exposed to hazardous work environments for a long time, more technical guidance and proper use of eyewash and shower equipment should be provided.

Seven: Summary In the above aspects, the eye wash and shower equipment are described in detail according to the ANSI Z358-1-2004 standard. To use eyewash and shower equipment, professional technical training must be provided for employees, and an emergency response mechanism must be established.