FLAME SHAPE ADJUSTMENTS

Fig. 15 - Vapor Pressures Of Propane, Butane & Butane-Propane Mixtures

TM-5-3895-374-24-1 Paving Machine Bituminous Material: Crawler Mounted Diesel Engine Driven Manual
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TM 5-3895-374-24-1 GP440FG 0. FLAME SHAPE ADJUSTMENTS There are two devices on the burner which can effect the flame shape: the Spin Vane Adjustment Ring and the Secondary Air Sleeve. The Spin Vane Adjustment Ring is the principle means of adjusting flame shape. The Spin Vane Adjustment Ring uniformly adjusts the angle of 16 secondary air spin vanes which impart spin to the secondary air stream as it leaves the burner. These vanes, when set at an angle, increase the air/fuel mixing rate and produce a shorter, bushier flame. The effect can be minor or severe, de-pending on the angle setting of the vanes. The greater the angle (adjustable from 30-60 degrees), the shorter and bushier the flame. The amount of secondary spin is read on the Spin Vane Indicator, mounted on the Spin Vane Setting Indicator Plate. In some applications, high spin may cause overheating of the drum front bulkhead and combustion zone flights. In such cases, reduce the spin angle as necessary until such condition is eliminated. Spin Vane Adjustment: 1. Shut down the burner system. 2. Loosen the locking bolt and using the Spin Vane Adjusting Lever, rotate the ring until the Spin Vane Indicator reads 45 degrees. 3. Tighten the locking bolt. Burners Equipped With Secondary Air Sleeve: The Secondary Air Sleeve prevents the free expansion of the secondary air as it leaves the secondary air tube. This concentrates the secondary air, which improves the atomization of fuel oil. The farther the sleeve is extended, the narrower the flame becomes. The optimal sleeve position is dependent on the specific fuel used and is more critical with heavy oil. If the sleeve is not extended far enough, the oil may not be atomized fully and cause a dark flame. On heavy oil, if the sleeve is extended too far, the atomized oil spray will impinge and deposit on the sleeve. Secondary Air Sleeve Adjustment: 1. Shut down the burner system. 2. Allow the burner to cool to the touch. 3. In the front of the burner is a slot (see fig. 16) to adjust the sleeve: a. Loosen the Sleeve Locking Bolt. b. Relocate the sleeve to the desired extension distance. (3/4 inch is a nominal setting.) The extension distance is the distance the sleeve is protruding out the end of the burner (see fig. 16). c. Tighten the Sleeve Locking Bolt. (page 3-522)

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