Details of galvanized seamless steel pipe length dimensions

The length dimensions of galvanized seamless steel pipes are important for ensuring that they meet the requirements for various applications. There are several standardized length classifications, each serving specific purposes in accordance with the order contract and delivery requirements.

Indeterminate Length (Usual Length)
Galvanized seamless steel pipes are often produced in varying lengths, and these lengths fall within the range specified by industry standards. This type of length is referred to as "indeterminate length," which is also known as "usual length" or "through length." The pipes are not pre-cut to a fixed size but are within the acceptable range defined by the standard.

Fixed Length
When galvanized seamless steel pipes are cut to a specific size according to the order requirements, the length is referred to as "fixed length." In this case, the pipe length must exactly match the length specified in the order contract. For example, if the contract stipulates a fixed length of 6 meters, the delivered pipes must be precisely 6 meters long. Pipes shorter or longer than this will be considered non-compliant. Positive deviations (lengths slightly longer than specified) are allowed, but negative deviations (shorter lengths) are not. For fixed lengths not exceeding 6 meters, the allowable positive deviation is up to +30mm, while for lengths over 6 meters, the allowable positive deviation extends to +50mm.

Multipliers
Galvanized seamless steel pipes can also be delivered in integral multiples of a specified length. When this happens, the length is referred to as "multiples." For instance, if the contract specifies a single length of 2 meters, the pipes may be delivered in multiples such as 4 meters, 6 meters, etc. Each multiple is subject to the addition of saw kerf, which is the material lost during cutting. The saw kerf amount is defined in the standard. For deliveries in multiples, only positive deviations are allowed, and negative deviations are not permitted.

Short Ruler
A "short ruler" refers to a pipe whose length is below the minimum limit of the indeterminate length specified by the standard but still meets the minimum allowed length. For example, in fluid transportation steel pipe standards, up to 10% of the batch (calculated by number) can consist of short-length pipes with lengths between 2 and 4 meters. In this case, 4 meters is the lower limit of the indeterminate length, and the shortest allowed length is 2 meters.

These length classifications ensure that galvanized seamless steel pipes meet the needs of various industrial applications while adhering to specifications related to length tolerances and order requirements.