product specification sheet â sd2k desuperheater - Fagerberg

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PRODUCT SPECIFICATION SHEET – SD2K DESUPERHEATERPrinciple of OperationThe coolant fluid enters the <strong>desuperheater</strong> head through thecoolant branch and passes into the cage where with the plugon its seat no fluid is admitted to the spray nozzles. The initialmovement of the actuator will move the plug off its seatallowing fluid to pass through. Subsequent movement of theactuator will move the plug to uncover successive rows ofspray nozzles and in this manner the quantity of fluid into thevapour flow is controlled. As fluid enters the discharge portbehind each spray nozzle, a high velocity flow is set-upinduced by the pressure drop between the coolant pressureand the vapour pressure. This high velocity flow jet enters theswirl chamber at the rear of the spray nozzle and assumes aswirling action, which results in a fine spray cone dischargingthrough the individual nozzles.Materials of ConstructionBody (Cast):Cage Retaining Ring:Cage (Upper):Cage (Lower):Plug:Stem:Spirol Pin:ASTM A217, Grade WC6ASTM A217, Grade WC9ASTM A351, Grade CF8MASTM A182, Grade F11 orASTM A182, Grade F22ASTM A182, Grade F11 orASTM A182, Grade F22ASTM A743, Grade CA15ASTM A276, Type 420, HardenedASTM A276, Type 316, Condition BType 316 SSPiston Ring: Type JP 900Swirl Disc:Orifice Disc:Gasket:Stainless SteelASTM A276, Type 420, HardenedSpiral wound 304 SS with Graphite FillerREVISION No: 02 SHEET 2 OF 4
PRODUCT SPECIFICATION SHEET – SD2K DESUPERHEATERMinimum Pipe SizeThe Minimum header or liner inside diameter for the Model 3/2 is 4.50 InchesThe Minimum header or liner inside diameter for the Model 3/3 is 5.50 InchesThe Minimum header or liner inside diameter for the Model 3/5 is 7.50 InchesCoolant PressureCoolant pressure should be a minimum of 30 psi (2 bar) and a maximum of 2000 psi (138 bar)above the vapour pressure. The maximum static pressure for the coolant should not exceed 2000psig (138 barg) or the pressure rating of the unit head.Temperature LimitationsA Maximum temperature of 1050 o F (565 0 C)applies to alloy steel units.Velocity LimitsFor successful desuperheating a minimum velocity is required in the vapour header. In order toensure that the unit is not noisy in service or does not give rise to erosion problems, a maximumvelocity is also stipulated, The upper and lower limits of velocity are as follows: -Maximum Vapour Velocity = 50,000 ft/min (254 m/s)Minimum Vapour Velocity = 1,500 ft/min (7.5 m/s)Maximum Vapour Velocity = 30,000 ft/min (150 m/s) to limit pipeline noiseTemperature Control AccuracyThe temperature Control accuracy with this type of <strong>desuperheater</strong> is +/- 9 o F (5 0 C)Minimum Controllable TemperatureBecause of the above temperature control tolerance the unit can control temperature down to aslow as 15°F (8 0 C)above saturation pointTemperature Sensing Point LocationThe location of the temperature sensing point downstream of the SD2K is governed by theThermodynamic Conditions and varies from 16 ft (5 m)with the smallest Cv, up to 30 ft (9 m) withthe largest Cv.
Page 1: PRODUCT SPECIFICATION SHEET - SD2K

product specification sheet â sd2k desuperheater - Fagerberg

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product specification sheet â sd2k desuperheater - Fagerberg