Please note that the bend angles stated in my first reply are also applicable to your B31.8 pipeline design. what is the minimum allowable cold bend angle per code?). My response above is an answer to your original question in relation to cold bending of line pipe in reference to design codes (i.e. RE: Maximum bending of a cold formed bend acedude1 (Mechanical) 10 Oct 19 19:29 Or equivalent bending machine, no internal mandrel and experienced bending engineer. Or equivalent bending machine with internal mandrel and experienced bending engineer.Ĥ) Case 3 - Achievable in practice with API 5L X60 or higher, Thicker wall pipe using CRC A few random length pipe joints (aprox 40 ft length each) are cold bent and then inspected to verify conformance with the code requirements and to assess any damage or adverse wrinkling or cracking.ġ) Cold bend angles are total angle per 40 ft double random pipe lengthĢ) Case 1 - Theoretical based on table in B31.4, clause 404.2.2ģ) Case 2 - Achievable in practice with API 5L X60, schedule 40 line pipe using CRC This is referred to as the field cold bending verification test performed by the construction contractor and his cold bending engineer. In general prior to any production cold bending operations, the selected cold bending equipment must be validated via a cold bending test using the actual pipe to be used for the pipeline project. Refer to the results in the attached table.Īs important is the equipment to then be used for the actual cold bending process in the field to comply with these code requirements.

In order to convert this information to answer your question for a crude oil pipeline, some calculations need to be performed. This table provides the allowable minimum cold bend radius for the range in pipeline diameters. The table in Clause 4.2.2 provides some insight to your question. Please refer to the following clauses in this code: For example if the pipe is intended to be for cross country oil pipeline service, the governing ASME code is B.31.4. Associated The ASME codes generally have a code clause that addresses criteria for 'cold bends', 'Pre-formed bends', Field bends. power piping, process piping, oil pipeline, gas pipeline.etc.)This would then identify the appropriate design code that will govern the design. It is essential to define the intended service of the pipe (i.e.

Tube bending wrinkle chart