MIL-T-425 Tube, Steel: Pipeline Section; With Grooved Nipple Welded On Each EndThis specification covers thin wall steel pipe with a grooved pipe nipple welded on each end.

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MIL-T-425J

6.3  First article.  When a first article inspection is required, the item(s) should be a preproduction model.  The first article should consist of one or more units.  The contracting officer should include specific instructions in acquisition documents regarding arrangements for examinations, approval of the first article test results and disposition of the first articles.

Invitation for bids should provide that the Government reserves the right to waive the requirement for samples for first article inspection to those bidders offering a product which has been previously acquired or tested by the Government, and that bidders offering such products, who wish to rely on such production or test, must furnish evidence with the bid that prior Government approval is presently appropriate for the pending contract.  Bidders should not submit alternate bids unless specifically requested to do so in the solicitation.

6.4  Part or identifying number (PIN).  The part or identifying number of pipeline section covered by this specification shall be as follows:

M                    425                   –                     x                     x

Prefix

Specification number

Size code letter

(see table II)

Exterior coating code number

(see table III)

6.4.1  Size.  The nominal pipe size of the pipeline sections shall be designated by the following symbols (see table II):

TABLE II.  Size code letter.

6.4.2  Exterior coating.  Coating of the outside surfaces of pipeline sections shall be designated by the following code numbers (see 3.8 and table II):

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