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ABOUT  HAMMER WING UNIONS

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2" Figure Number 602, 1002,and 1502
Hammer Wing Union Identification Tool

(To Identify Male and Female Union Halves, Click Here)
For a PDF version of the following instructions, click here.

If operators attempt to join the male half of a 2" Fig. 1502 union (nut half) to the female half (threaded half) of a 2" Fig 602 or a 2" Fig. 1002 union, only a partial engagement of the threads will occur.

No greater hazard exists with oilfield pressure control equipment than mismatched hammer wing unions. Union manufacturers and user groups have posted various warnings about this problem online. You can find these warnings by an internet search for "warnings about joining 2" 602, 1002, and 1502 unions".

To avoid connecting a Known 2" 1502 male half union to a 2" 602 / 1002 female half union, you only need to identify 2" 602 / 1002 female (external thread) union halves by finding readable marking, or by using a WOODCO USA 2" 602 /1002 Union Identification Tool, to positively identify the 2" 602 / 1002 union profile.

To positively identify a union as 2" 1502, you will need to find readable marking, or use a WOODCO USA 2" 1502 Union Identification Tool.

Connecting a WOODCO USA 2" 602 / 1002 and 2" 1502 Union Identification Tool together with a 2" diameter key ring provides a convenient way to identify male and female halves of these two specific union geometries.

Unions other than 2” 602, 1002 and 1502 may also seem to connect, yet still present a hazardous situation. Do not assume any union connection safe unless you can identify both connecting halves as identical in size, figure number or other designation, and working pressure.

To aid in identification of the most common Figure Number Unions, and minimize the likelihood of union mismatch, WOODCO USA has available, Union Identification Tools. Click here to see the sizes of Identification Tools available.

No problems will likely occur if operators identify their unions and avoid any attempt to join them inappropriately.

 

Union Identification Tool Examples                            


See the usage illustrations below. You will see a 2" Fig. 1502 union identification tool shown fitted to union profiles. A close fit of the tool faces to the union profile features, identifies the union geometry.

Identification of geometry only, requires that operators assume the lowest working pressure for that geometry (reference table below). 

    
UNION SIZE AND FIGURE NUMBER WORKING PRESSURE FOR STANDARD SERVICE WORKING PRESSURE FOR SOUR SERVICE 

2" 602*
2" 1002*
2" 1502

6,000 psi
10,000 psi
15,000psi

6,000 psi
7,500 psi
10,000 psi

* 2" 602 AND 2" 1002 UNIONS HAVE IDENTICAL GEOMETRY (DIMENSIONS), BUT DIFFERENT WORKING PRESSURES. IN THE ABSENCE OF CLEARLY READABLE MARKING, ALWAYS CONSIDER UNIONS OF THIS GEOMETRY AS FIG. 602, 6,000 PSI WORKING PRESSURE.


Further identification as to Fig. 602, Fig. 1002, or Fig. 1502, standard or sour service, and corresponding working pressures, requires the discovery and reading of the manufacturers original marks. We recommend that operators not connect unions that do not display marking indicating the same figure # designation and working pressure on each connecting half.

 
Instructions For Hammer Wing Union Identification Tool
For a PDF version of the following instructions, click here.
 

WOODCO USA provides these tools for identification, estimating, and reference only. Do not use them for manufacturing or inspection. Users of these tools should not use them as a sole means of Union identification. Anyone making use of these tools does so at his own risk and assumes any and all liability resulting from such use. We recommend that operators not connect unions that do not display marking indicating the same figure # designation and working pressure on each connecting half.

 
FIT THE MALE EXTENSION OF THE IDENTIFICATION TOOL INTO THE NUT ON THE MALE UNION HALF TO CONFIRM SIZE  
      
FIT THE THREADED PROFILE ON THE IDENTIFICATION TOOL INTO THE THREADS OF THE NUT ON THE MALE UNION HALF TO CONFIRM THREAD COUNT AND FORM  
   
 
 
FIT THE FEMALE INDENTION OF THE IDENTIFICATION TOOL OVER THE EXTERNAL THREADS OF THE FEMALE  UNION HALF TO CONFIRM SIZE  
   
 
 
FIT THE THREADED PROFILE ON THE IDENTIFICATION TOOL INTO THE THREADS OF THE FEMALE UNION HALF TO CONFIRM THREAD COUNT AND FORM  

A close fit of the tool faces to the union profile features, identifies the union geometry. Identification of geometry only, requires that operators assume the lowest working pressure for that geometry.

If operators find they must connect a male 2" fig. 1502 to a female 2" fig. 602 or 1002 union, an adapter as shown below, will safely accomplish the connection. The adapter may have 10,000 psi WP for standard service or have 7,500 psi WP for sour service when attached to 2" fig. 1002, or 6,000 psi WP when attached to 2" fig. 602.

 

    

Click here to view the WOODCO USA Catalog for Pressure Control Equipment.

Click here for more information about current efforts to create an API Standard for Figure # Hammer Unions.

At WOODCO USA the same knowledge and effort we put into this web site goes into every product we sell. If this Web Site helps you, or persons for whom you have responsibility, please reward WOODCO USA with your business.



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