Performance requirements(anchor depth ＞ 82.5m) for marine anchor windlass

According to the GB/T 4447-2008/ISON4568:2006 standard, when producing marine anchor windlass with an anchoring depth of ＞ 82.5m, its performance should meet the following requirements:

1. The specified performance requirements are based on the use of one anchor chain wheel at a time.

2. The windlass should have the ability to work continuously for 30 minutes under working load, and it is required to have the ability to reduced speed and work continuously for at least 2 minutes under the overload tension specified in 4.

3. The nominal anchoring speed of the windlass should not be less than 0.15m/s.  Using standard anchors, and taking the efficiency of anchor chain tubes is 70%, with a buoyancy coefficient of 87%.

4. When determining the performance data of the windlass, the following data should be used:

1. Workload Fw2, expressed in Newton (N), when the anchor depth is greater than 82.5m

   ——Grade 1 anchor chain: Fw2 = 37.5 d2 + (D-82.5) × 0.27d2；

   ——Grade 2 anchor chain: Fw2 = 42.5 d2 + (D-82.5) × 0.27d2；

   ——Grade 3 anchor chain: Fw2 = 47.5 d2 + (D-82.5) × 0.27d2.

   Here, d is the diameter of the anchor chain, in millimeters (mm); D is the anchoring depth, in meters (m).

2. Overload pulling force ≥ 1.5×37.5 d2 / 42.5 d2 / 47.5 d2.

3. Support load

   ——Chain stopper: 0.45 ×  Anchor chain breaking load;

   ——Chain free stopper: 0.8 ×  Anchor chain breaking load.

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