Here is How to choose a fitful mud agitator for drilling mud solids-Revomal.

* Presume:* A compartment is 30 feet long, 10 feet wide, and 10 feet high (Figure1). Maximum mud weight is anticipated to be 16 lb/gal (1.92 SG).

If the maximum mud weight is not known, use 20 lb/gal fluid density

(2.4 SG).

All compartments will be solids-removal sections.

Convert the compartment to symmetrical shapes. In this case, three

compartments 1010 feet square (33 m). Determine the volume for

one compartment (Vt).

*Vt = 10 × 10 × (10 − 1) × 7.48*

*Vt = 900 × 7.48*

*Vt = 6732 gal.*

Since the tank is deeper than 6 feet, flat (turbine) impellers cannot be

used; therefore, canted impellers are chosen. Locate the appropriate

impeller diameter from the impeller displacement table D (see Table 10.2)

so that TOR is within the recommended range. As a rule, choose an

initial impeller displacement value so that D is close to Vt to increase the

accuracy of the selection. In this case, the gpm value for 60-Hz service is

close to the 38-inch impeller (6343 gal).

*TOR = [Vt⁄D] × 60*

*TOR = (6732⁄6343)×60*

*TOR = 1.06×60; or about 64 seconds.*

*table 1 Power Requirements for Canted Impellers per Fluid Density*

Impeller Diameter | |||||||||

Power | 20 ppg (2.40 SG) | 16 ppg(1.92 SG) | 12 ppg(1.44 SG) | 8.3 ppg(1.00 SG) | |||||

Hp | Kw | In | Cm | In | Cm | In | Cm | In | Cm |

1.0 | 0.7 | 22 | 56 | 24 | 61 | 26 | 66 | 29 | 74 |

2.0 | 1.5 | 26 | 66 | 28 | 71 | 30 | 76 | 32 | 81 |

3.0 | 2.2 | 29 | 74 | 31 | 77 | 33 | 83 | 34 | 86 |

5.0 | 3.7 | 32 | 81 | 34 | 86 | 36 | 91 | 38 | 97 |

7.5 | 5.6 | 35 | 89 | 37 | 94 | 39 | 100 | 42 | 107 |

10.0 | 7.5 | 37 | 94 | 40 | 102 | 43 | 109 | 46 | 117 |

15.0 | 11.2 | 42 | 107 | 45 | 114 | 49 | 123 | 51 | 130 |

20.0 | 14.9 | 46 | 117 | 50 | 126 | ||||

25.0 | 18.6 | 49 | 124 | ||||||

30.0 | 2.4 |

Compare this TOR to values in Table 10.1 and determine suitability

for compartment purpose. In this example, the TOR is sufficient for

solids-removal compartments. If a lower numeric value to cause faster

fluid movement is desired, then choose a larger impeller. If less movement is desired, choose a smaller impeller and recalculate until the

appropriate values from Table 10.1 are achieved.

After determining which impeller will produce the effective TOR,

locate the size in the Impeller Diameter columns in Table 1. In

this case we anticipate using a 38-inch impeller and 16-ppg fluid. Since

there is no 38-inch value in the 16-ppg column in Table 10.3, we must

round up to the next highest value, that is, 40 inches. This allows for a

safety factor should the mud density increase slightly. Follow the 40-

inch impeller value horizontally to the left in Table 1 and determine the horsepower needed for that application. In this case, a 10-hp motor is

sufficient. Therefore, three 10-hp agitators with 38-inch canted impellers

are suitable for the tank in this application.

It should be noted that this system is for one brand of agitator, and

the values in the tables may not apply to all brands. Deep tank designs

require that multiple blades be mounted on a single shaft. This involves

more thorough calculations than those shown. Because of this, it is

highly recommended that the manufacturer or supplier be consulted

before final design or placing of an order for any application.