Nozzle Orientation

EXHIBIT 6-27 Alternative Arrangements for Locating Exchanger Nozzles 

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For centrifugal compressors, nozzle orientation must be specified. If the compressor is on an elevated foundation, the down-nozzle orientation makes maintenance much easier, because major piping does not have to be removed to lift the casing upper half. Figure 11-1 shows an unusual case where all the nozzles are in the upper casing half. 

Water Sprays (Directed at Equipment) Can be activated automatically without operator involvement. More prone to plugging due to nozzle orientations. 

DESIGN BHP NOZZLE ORIENT SIZE rating THRUST DIRECTION ... 

Arrangement b (often referred to as the false downcomer) is popular. It offers better liquid distribution than the others, does not suffer from hydraulic jump, and provides some flexibility in inlet nozzle orientation. The width of the false downcomer should be the same as the width at the bottom of a downcomer (307). For feed into center or off-center downcomers it is recommended to make the x -f- y dimension 12 in (307). If entrainment due to liquid splashing in the false downcomer is a concern, a horizontal baffle, with dimensions of about 2d by Wrf can be installed directly above the nozzle entry into the false downcomer. This baffle is installed at some clearance above the false downcomer. In most cases, there is no need for this baffle. 

Length of the duct segment being considered—depends on the plant layout, nozzle orientation of the units at either end of the duct, and space available between units which are connected by the duct under consideration. 

Assembly drawings—nozzle orientations for gas inlet/exit/thermocouples/sam-pling points/bottom drain point Specifications of brick lining and filter mass Sample of filter mass used External insulation and cladding Quantity of dust removed dming shutdown... 

Type—positive displacement/centrifugal Suction and discharge nozzle orientations... 

Level high in reboiler instrument/inlet or exit pipe nozzle too small/wrong nozzle orientation/steam trap fault, see Section 5.1/steam trap is above the reboiler. 

Equipment designs with nozzle orientation shall be finalised. 

Nozzle orientations for incoming/outgoing streams not as per layout/as per piping diagram/designs. 

Visual checks of aU dimensions, nozzle orientations, fittings, etc. 

Nozzle orientations must match the final layout ofplant. Orientations to be considered while fabrication drawings are made—without any violation of statutory instructions... 

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