B36.19 Standard for Stainless Steel Pipe

3. Ordering Information

3.1 Information items to be considered, if appropriate, for inclusion in purchase orders are as follows:

3.1.1 Quantity (pieces),

3.1.2 Name of material (carbon steel or austenitic stainless steel pipe nipples) (see 4.1.1 and 4.1.2),

3.1.3 Method of pipe manufacture (continuous-welded, electric-resistance welded, or seamless). (see 4.1.1, Note 1),

3.1.4 Type and grade (if stainless steel),

3.1.5 Finish (carbon steel, black or galvanized),

3.1.6 Size (nominal and weight class or schedule number as shown in Table 1, or outside diameter and nominal wall),

3.1.7 Length (standard or special, see 4.3),

3.1.8 Specification number,

3.1.9 Certification of compliance, if required, and

3.1.10 Special requirements or exceptions to this specification.

1. In addition, when material is purchased for agencies of the U.S. Government, it shall conform to the Supplementary Requirements as defined herein when specified in the contract or purchase order.
2. Requirements

4.1 Material and Weight—Pipe nipples covered by this specification shall be made from new, pressure-tested pipe conforming to the requirements specified in 4.1.1 and 4.1.2.

4.1.1 Carbon Steel—Carbon steel pipe nipples shall be in

　

NOTE 1—Unless otherwise specified, continuous–welded nipples are furnished in sizes NPS 4 and under for standard and extra strong pipe, and NPS 21⁄2 and under for Schedule 160 and double extra strong pipe. Welded nipples in sizes larger than that indicated for continuous–welded are electric resistance welded.

4.1.2 Austenitic Stainless Steel—Austenitic stainless steel pipe nipples shall be in accordance with Specification A 312.

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TABLE 1 Pipe Nipple Sizes According to Weight of NominalPipe SizesAB

4.3.1 The standard lengths and sizes of nipples generally available are shown in Table 2. The availability of such nipples according to pipe size and weight is shown in Table 1.

4.3.2 Special lengths and sizes of nipples may be specified when required. Standard and special lengths shall conform to the tolerance requirements of 4.3.3.

4.3.3 Nipples with lengths up through 12 in. (304.8 mm) long shall have a length tolerance of 6 1⁄16 in. (1.6 mm). Nipples over 12 in. long shall have a tolerance of 6 1⁄8 in. (3.2 mm).

4.4 End Finish—The ends of the pipe nipples shall be chamfered on the outside at an angle of 35 6 10 ° to the central axis. (It is the standard practice that the 1⁄8-in. (3.2-mm) nominal pipe size nipples are not chamfered.) Ends shall be cut reasonably square to the central axis. All burrs on the inside shall be removed.

1. Galvanized Nipples—Galvanized nipples ordered under this specification shall be made from pipe coated on the inside and outside by the hot-dip process. Threads and nipple ends are not galvanized.
2. Sampling and Inspection

5.1 Sampling—Samples of nipples sufficient to determine their conformance with the requirements of this specification shall be taken at random for each lot of nipples of the same pipe size, length, and material.

5.2 Inspection—The samples shall be inspected to deter-mine their conformance with the dimensional requirements, including thread dimensions and finish of this specification.

5.3 Gaging Techniques for Male Threads:

5.3.1 An NPT working ring gage, in accordance with ANSI B1.20.1, shall be turned hand tight on the nipple threads. The gage shall be tapped or rapped against a solid surface and the gage again turned hand tight into the thread. Hand tight means turning the gage until moderate resistance is encountered; no excessive force shall be used. After the second tightening operation, the end of the thread should be flush to the gage face, plus or minus one turn.

5.3.2 The usual technique for tapping or rapping the gage is to swing the end of the fitting with the ring gage attached through an arc of approximately 4 to 6 in. (100 to 150 mm) to allow the gage to strike against a solid metal surface. This tapping procedure is used to eliminate any binding due to slight nicks or foreign matter in the threads.

NOTE 2—Any mechanical device that simulates the gage tapping or rapping to achieve the same results is also permitted.

5.4 The inspector representing the purchaser shall have entry, at all times while work on the contract of the purchaser is being performed, to all parts of the manufacturer’s works that concern the manufacture of the nipples ordered. The manufacturer shall afford the inspector all reasonable facilities to satisfy him that the nipples are being furnished in accor-dance with this specification. Inspection shall be made at the place of manufacture prior to shipment, unless otherwise specified, and shall be so conducted as not to interfere unnecessarily with the operation of the works.

6. Rejection

1. Each nipple that fails to meet the requirement of this specification shall be rejected, and the manufacturer notified.
2. Certification

7.1 When requested at the time the order is placed, the manufacturer shall provide certification that the nipples comply to all the requirements of this specification.

1. The nipple manufacturer shall maintain a record on pipe mill test report certifications.
2. Identification and Packaging

8.1 Individual nipples are not normally identified. Packaged nipples shall have their containers legibly marked to show the brand or name of manufacturer, size, length, quantity, method of pipe manufacture, type and grade of material (if other than carbon steel), ASTM A 733, and finish.

8.2 At manufacturer’s option, large size, extra long nipples, and odd lots are bagged or bundled with tags identifying the product in accordance with 8.1.