Can flexible metal hoses be used in official pipelines as pressure conduits?
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I have a project involving the complete replacement of a DN100 pressure pipeline. More than ten meters of it is within the culvert, making the construction quite difficult. Is it permissible per the specifications to use a flexible metal hose to replace this section during installation?
According to the provisions of the \"Regulations on Safety Inspection of Pressure Pipelines,\" metal hoses can only be used at the bent sections and expansion sections of pipelines, or in special situations. When using such pipelines in formal systems as pressure pipelines, standard-compliant steel or cast iron pipes must be employed to ensure the reliability and safety of the pipelines. Therefore, when replacing DN100 pressure pipes, standard-compliant steel or cast iron pipes should be used, rather than metal hoses as a substitute. If the construction is difficult, other measures can be considered, such as adding supports or changing the construction method to solve the problem. .
Commonly used at liquid cargo terminals, with lengths of several dozen meters.
Sure, metal hoses are also used as piping at the inlets and outlets of many pumps. It mainly depends on the pressure of the fluid flowing through the pipeline; generally, pressures up to 30 kilograms per square centimeter are no problem
It’s best not to use it; once it gets damaged and starts leaking, it’s different from rigid pipes. For reference.
Why is it easier to install hoses than steel pipes inside culverts? Metal hoses should be installed in a straight line in a free state; it is not allowed to use the hoses to adjust the installation deviations of the pipelines ； Supports or brackets cannot be installed on the hose; as a result, the flow of the medium inside the culvert will cause the hose to rub against the ground, and this could damage the protective sleeve
In the administrative approvals for special equipment, as stated in Document No. 41 of 2021, there is nothing related to the original pressure pipelines you mentioned; such pipelines must undergo type testing before they can be put into use, so it’s not possible
It is recommended to provide the design parameters and operating parameters of the pipeline so that everyone can offer suggestions.