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What kind of inspection should iron pipe be done when it leaves the factory

2019-07-04 948
Hardness test is needed in the process of using iron pipes, but it is difficult to test the hardness of iron pipes in the general body of iron castings, so iron pipes are usually completed by multiple parts.
Hardness test of iron pipe can be carried out in batches. It can be planned from three aspects. Details can be agreed upon according to the requirements of both sides.
Secondly, according to the number of taps, the same furnace pouring, the same furnace heat treatment, if the need for heat treatment of castings, according to the same brand or the same brand of castings in the smelting process under stable conditions.
In the inspection before and after the iron pipe installation, select a sufficient number of materials and components to check and verify whether they fully conform to the specifications of iron pipe and whether they are in excellent condition.
Pipeline welding shall include weld inspection by welders and longitudinal weld inspection of 100% processed parts, but weld inspection of parts agreed to in this Code shall not be allowed.
Finally, the assembly quality of threaded joints, bolted joints and other joints is sampled and inspected. All threads, bolts and other mechanical joints shall be inspected when air pressure testing is required.
In addition, the National Standard Iron Tube Branch reminds you that each batch should be tested, at least three products should be randomly checked for eligibility considerations, if there are unqualified products in random sampling, if not qualified, then the whole batch of products will also be regarded as unqualified products, must be manufactured from scratch.

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