Wrench

1. A wrench, comprising:

a head having a first end and a second end; and

a handle extending from the head;

wherein the head defines and at least partially surrounds an opening,

wherein the head defines at least one recess continuous with the opening,

wherein the head defines a partial recess at the second end of the head,

wherein the total number of recesses and partial recesses is equal to a number of lugs of the hammer union, and

wherein a distance between the first end and the second end of the head is greater than a cross-sectional diameter of a pipe flange of a hammer union.

2. The wrench of claim 1 , wherein the partial recess has the same shape as at least a portion of the at least one recess.

3. The wrench of claim 1 , wherein the first end of the head defines a catch configured to engage a lug of the hammer union.

4. The wrench of claim 1 , wherein the at least one recess includes at least two recesses.

5. The wrench of claim 4 , where the at least two recesses are spaced apart from one another about a central axis of the head of the wrench such that each of the recesses is configured to align with one lug of the hammer union.

6. The wrench of claim 4 , wherein the at least two recesses are spaced approximately 120° apart from one another about a central axis of the head of the wrench.

7. The wrench of claim 1 , wherein the partial recess is spaced apart from the at least one recess about a central axis of the head of the wrench such that the partial recess and each of the at least one recesses is configured to align with one lug of the hammer union.

8. The wrench of claim 1 , wherein the handle is configured to be rotated by a drilling operator.

9. A method for fastening or unfastening a hammer union, the method comprising:

providing a hammer union having a first pipe flange, a second pipe flange, and a collar having one or more lugs, the collar configured to be threaded onto the first and second pipe flanges;

providing a wrench including a head and a handle extending from the head, wherein the head defines and at least partially surrounds an opening, and wherein the head defines at least one recess continuous with the opening, wherein the head of the wrench comprises a first end and a second end and wherein the head of the wrench defines a partial recess at the second end of the head, the partial recess configured to align with one of the lugs of the collar of the hammer union;

positioning the head of the wrench relative to the hammer union such that a central axis of the head of the wrench aligns with a longitudinal axis of the hammer union;

sliding the head of the wrench axially toward the collar of the hammer union such that each of the at least one recesses of the wrench aligns with one of the lugs of the collar of the hammer union; and

rotating the handle of the wrench to rotate the collar of the hammer union relative to the first and second pipe flanges.

10. The method of claim 9 ,

wherein a distance between the first end and the second end of the head is greater than a cross-sectional diameter of the first and second pipe flanges of a hammer union such that, during positioning of the head of the wrench relative to the hammer union, a portion of the first or second pipe flange is passed between the first and second ends of the head of the wrench.

11. The method of claim 9 , wherein the first end of the head of the wrench defines a catch configured to engage one of the lugs of the hammer union.

12. The method of claim 11 , wherein, if the wrench is used for fastening the collar of the hammer union, the wrench is positioned relative to the hammer union such that the catch is at a counterclockwise position relative to the handle.

13. The method of claim 11 , wherein, if the wrench is used for unfastening the collar of the hammer union, the wrench is positioned relative to the hammer union such that the catch is at a clockwise position relative to the handle.

14. The method of claim 9 , wherein the partial recess has the same shape as at least a portion of the at least one recess.

15. The method of claim 9 , wherein the at least one recess defined by the head of the wrench includes at least two recesses.

16. The method of claim 15 , wherein the at least two recesses are spaced approximately 120° apart from one another about the central axis of the head of the wrench.

17. The method of claim 9 , wherein rotating the handle of the wrench is performed by a drilling operator.