GB/Z 33902-2017Measurement of fluid flow by means of pressure differential devices -- Guidelines on the effect of departure from the specifications and operating conditions given in GB/T 2624 and the correction methods (English PDF)

1 Scope

This guidance is given in the guidance of technical documents using the structure and working conditions beyond the scope of GB/T 2624 differential pressure device to measure flow guide.

Additional tolerances or amendments do not necessarily compensate deviations from the provisions of GB/T 2624 (all parts) of the impact. This guideline technique

The information given in the document first describes the effects that will be caused by the non-conformity of the requirements to specify the necessary requirements for the manufacture, installation and maintenance of DP devices

The second is to enable users who can not fully meet the requirements to generally estimate the size and scope of the resulting traffic error.

Each of the changes described in this guidance document is considered the only change that has occurred. If it is known that there are multiple changes, it may be saved

In unpredictable interactions, special attention needs to be paid when evaluating these errors in combination. If there is a considerable amount of error, it must be

Consider ways to eliminate some of these errors. The changes included in this guidance document are not exhaustive and relate mainly to the fact that the orifice example. An example of a venturi is given at the end of the chapter. There is no doubt that the device does not meet GB/T 2624 (all parts)

There are many similar examples, no disclosure of any comparable data. Such additional letters are obtained from users, manufacturers or other sources

Interest rates may be considered in the next version of this guidance document.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version applies to this article

Pieces. For undated references, the latest edition (including all amendments) applies to this document.

GB/T 2624.1-2006 Measurement of full pipe fluid flow using differential pressure devices installed in circular sectioned pipes - Part 1. General

Principles and requirements (ISO 5167-1.2003, IDT)

GB/T 2624.2-2006 Measurement of full pipe fluid flow using a differential pressure device installed in a circular sectioned pipe - Part 2 - Orifice (ISO 5167-2.2003, IDT)

GB/T 2624.3-2006 Manifold fluid flow measurement using a differential pressure device mounted in a circular sectioned pipe - Part 3. Nozzle

And Venturi nozzle (ISO 5167-3.2003, IDT)

GB/T 2624.4-2006 Manifold fluid flow measurement using differential pressure devices installed in circular sectioned pipes - Part 4 Ventura

In tube (ISO 5167-4.2003, IDT)

3 Terms and definitions

GB/T 2624.1-2006 defined and the following terms and definitions apply to this document.