Abstract： ASME B16.39:2019 pdf download.Malleable lron Threaded Pipe Unions Classes 150,250, and 300. 11 AIR-PRESSURE TEST Assembled unions selected In accordance with section 12 shall be tested with air at a minimum pressure of 2.8 bar (44) psi). 12...

ASME B16.39:2019 pdf download.Malleable lron Threaded Pipe Unions Classes 150,250, and 300.

11 AIR-PRESSURE TEST

Assembled unions selected In accordance with section 12 shall be tested with air at a minimum pressure of 2.8 bar (44) psi).

12 SAMPLING FOR AIR-PRESSURE TEST

A random sample of unions representative of the production lot shall be submitted for testing in accordance with section 11, The

average outgoing quality level (AOQ[j, as defined in ANSI/ASQ Z1.4, of the established acceptable sampling plans used shall not

exceed 2%. A lot, for purposes of this Standard, is defined as the number of unions of the same size, design, and pressure rating

submitted for testing at any one time.

13 COATINGS

13.1 MaLLeabLe Iron Unions

When malleable iron unions are zinc coated, they shall be hot dipped in accordance with ASTM A153/A1S3M or have an

electrodeposited zinc coating conforming to ASTM 8633, Type 1, ServIce Condition 4. Hot-dipped coatings shall he a minimum

thickness of 86 m (0.0034 in.) and applied prior to threading. F.lectrodeposited zinc shall be a minimum thickness of 25 nm

(0.001 in.) and may be applied either before or after threading.

13.2 Steel Unions

NPS 1f unions made from steel bar, per para. 6(b), may be either uncoated or have an electrodeposited zinc coating conforming to

ASTM 8633, Type 1. Service Condi. Lion 4. The electrodeposited zinc coatings may be applied either belore or after threading,

13.3 Union Seating Surfaces

Union seating surfaces shall not be coated.

13.4 Other Coatings

Other coatings, specified by the purchaser, shall he furnished meeting the agreed requirements. Copper or copper-alloy seats shall not have a zinc coating.

14 DIMENSIONS

Dimensions are given in Tables 14-1 through 14-3.

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