1. (a) The tug(s) used for the escorted vessel movements described in Section 851.22, Subsections (a) and (b), shall provide forces equivalent to those delineated in the following Tanker Force Selection Matrix. No more than two escort tugs may be used to meet the “Forces For Tug(s)” requirements in the Tanker Force Selection Matrix, except as provided in Sections 851.22(h) and 851.27(e).

   TANKER FORCE SELECTION MATRIX

   Tanker Displacement

   Forces For Tug(s) Tethered at the Stern (See Notes Below)

   Metric Tons

   Short Tons

   0 to < 60,000

   10

   60,000 to < 100,000

   20

   100,000 to < 140,000

   30

   140,000 to < 180,000

   40

   180,000 to < 220,000

   50

   220,000 to < 260,000

   62

   260,000 to < 300,000

   75

   300,000 to < 340,000

   87

   340,000 to < 380,000

   105

   380,000 to < 420,000

   128

   Note 1: Ahead forces for tugs using stern lines (e.g., Voith-Schneider propeller -- VSP tugs). Astern forces for tugs using headlines (e.g., azimuth stern drive -- ASD tugs)

   Note 2: The “Forces For Tugs” described in the Tanker Force Selection Matrix were evaluated in a water depth equal to 1.2 times the tanker's deep draft for tankers with a displacement of less than 260,000 metric tons, and in a water depth equal to 1.1 times the tanker's deep draft for tankers with a displacement equal to or greater than 260,000 metric tons.

2. (b) Only tractor type tugs may be employed to meet the requirements of this subchapter.

3. (c) Any escort tug(s) employed to meet the “Forces For Tug(s)” requirements in the Tanker Force Selection Matrix shall have a pulling power as follows:

   1. (1) Laden tankers with displacements less than 180,000 metric tons must employ at least one tractor tug that has sufficient power to satisfy the “Forces For Tug(s)” requirements in the Tanker Force Selection Matrix.

   2. (2) Laden tankers with displacements equal to or greater than 180,000 metric tons may employ two tugs that have sufficient combined power to satisfy the “Forces For Tug(s)” requirements in the Tanker Force Selection Matrix, provided that:

      1. (A) both tugs have bollard pull ratings of 45 short tons or more, and
      2. (B) a team towing configuration is used. A “team towing configuration” is the practice of running two tugs in tandem on aft leads.
4. (d) All required escort tugs shall be tethered on the tanker's stern.
5. (e) The force requirements contained in this subchapter reflect favorable circumstances and conditions. The tanker master/pilot shall arrange for additional escort tug(s) should adverse weather conditions, unusual port congestion, the contemplated movement of the vessel or other conditions or circumstances so require.

Note: Authority cited: Sections 8670.17.2 and 8670.23.1, Government Code. Reference: Section 8670.17.2, Government Code.

History

1. New section filed 7-28-94; operative 8-29-94 (Register 94, No. 30).

2. Repealer and new section filed 8-19-98; operative 9-18-98 (Register 98, No. 34).

3. Amendment of subsections (b) and (d)(1), redesignation and amendment of a portion of subsection (d)(2)(A) as (d)(2)(B) and subsection relettering filed 7-16-2001; operative 8-15-2001 (Register 2001, No. 29).

4. Repealer and new section heading, renumbering of former subsection 851.26(a) to new subsection 851.27(e) and amendment of section filed 7-12-2012; operative 8-11-2012 (Register 2012, No. 28).