API 7HU1 : 2009 : INC : ERR 1 : 2014

1 Scope
  1.1 General
  1.2 Objective
2 Terms, Definitions, and Abbreviations
  2.1 Terms and Definitions
  2.2 Abbreviations
3 Mismatch Description
  3.1 General
  3.2 Example of the Hazard
  3.3 Mismatching 2-inch Figure 402, Figure 602 and, Figure
      1002 with 2-inch Figure 1502
4 Description of the Engineering Design Solution
  4.1 General
  4.2 Reduced Thread Major Diameter
  4.3 Raised Shoulder
  4.4 Mark Indicating Design
5 Measures to Prevent the Make-up of Mismatched Components
  5.1 General
  5.2 Replace all 2-inch Hammer Union Components in Fleet
      to 2-inch Figure 1502
  5.3 Go/No-go Gauges
  5.4 Inspection and Marking
  5.5 Training
  5.6 Management of Change (MOC)
  5.7 Permit-to-work (PTW) and/or Job Safety Analysis (JSA)
  5.8 Job Site Inventory of Hammer Union Components
  5.9 Color-coding
6 Mitigating the Effects of Mismatched Components Parting
  Explosively
7 General Safety Recommendations
  7.1 General
  7.2 Personal Protective Equipment (PPE)
  7.3 Inspection, Maintenance, and Testing
  7.4 Mixing Hammer Union Components from Different
      Manufacturers
  7.5 Documented Safe Practices
  7.6 Pressure Rating Consideration for Dynamic Conditions
  7.7 Other Mismatch Combinations
  7.8 System vs. Component Pressure Rating and Service
      Application
  7.9 Newly Manufactured Equipment not Conforming to New
      Engineering Design Solution
Bibliography

Provides procedural recommendations as well as an engineering solution to the mismatching of a female 2-inch Figure 402, a female 2-inch Figure 602, or a female 2-inch Figure 1002 hammer union component (sub) with a male 2-inch Figure 1502 hammer union component (wing nut).