What are the standards for DTH hammers? GB or landmark can be 5

** Take a look at yours?? Hammer See for yourself.

Let's talk about the national standard first: when you get a standard, if the standard year is relatively old, you can log on to the national standard query network to view the details of the standard, as shown in the figure below. Generally speaking, standards are reviewed and revised every five years, but revision does not necessarily mean the introduction of new standards, but only that those standards that are found to be no longer applicable in the revision will be updated, and then new standards will be issued.

What you said is inaccurate, I really haven't encountered this, the national standard query network should be the most authoritative, if you determine that it is not accurate, then what is your reference standard, is another agency for the current interpretation of the standard and the standard query online interpretation is different, then you need to confirm whether this agency is authoritative, whether there is the qualification to publish such information. In addition, it is not clear about the line mark, but in addition to the high usage rate of some specific standards in each line mark in our country, most of the line marks are no longer used, so the line mark feels that it can still be used less.

This is not necessarily, but it is usually the case that the industry standard is higher than the national standard, and the local standard is higher than the industry standard. Generally, landmarks are something you have to abide by, because your construction site will be responsible for acceptance in the future. Landmarks are often supplemented with some special standards according to the actual situation of the project site, so they must meet the landmarks without violating the national standard.

When there is only a conflict between the two standards, the situation should be reflected to the relevant management department and then the way to solve the problem.

It cannot be generalized, and it depends on the product type and parameter indicators.

Landmarks should not be looser than the national standard, and after the national standard is announced, the landmark should be modified accordingly. Only the national standard can be used.

I still think that the reason for choosing landmarks is very simple, "local standards are preferred if there are local standards, and industry standards are selected for industry standards", which standard is strictly selected for that standard, I think there is no basis.

I'm thinking about this question too, but I still don't understand it.

According to China's "Standards Law", local standards shall not be lower than the national standard, and can be higher than the national standard. Therefore, I think that local standards should be adopted first.

It is mainly based on the national standard, supplemented by landmarks.

National standards, industry standards, local standards.

There are also corporate standards.

There are 4 standards in China.

Hello, this can not only be viewed from one aspect, but must be analyzed comprehensively. First of all, you should be clear about the scope of application of these standards, if the national standards are fully applicable to your products, you can not take landmarks and line marks. Then consider that if some parts of your product are not covered by the national standard and cannot be tested by the national standard, you need to implement the landmark or line standard to supplement.

Landmarks will only be valid if they are strict with the national standard.

Chengdu Huabiao Enterprise Management Jiang Liangjun:

Regulations must be followed, and there is no such thing as being below or above. The system standards are divided into mandatory standards and recommended standards.

Mandatory standards are mandatory to be met, and recommended standards are voluntarily chosen by enterprises. Whether it is a mandatory standard or a recommended standard, it is usually the most basic requirement, and the standard of the enterprise can be stricter than the local, industry, and national standards, which can also confirm the strength of the enterprise in a certain aspect.

The strictness is the national standard, the industry standard, the landmark, and the enterprise standard, but the standard is ranked in the opposite direction.

It should be the national standard, the "line standard", the landmark, and the enterprise standard, which has higher requirements for technology and process.

The national standard "landmark" "line standard" enterprise standard.