Vertical conveying routes: a defensible assessment must connect process data, material behavior and equipment boundaries. Vertical pipework changes the energy balance of pneumatic conveying. An upward section requires the gas-solid system to lift material against gravity, while a downward section can accelerate particles and alter the local pressure profile. Neither effect is captured adequately by reporting only total pipeline length.
For a positive-pressure roots blower enquiry, the vertical route should be documented section by section. This allows the designer to distinguish elevation demand from air friction, bend re-acceleration, feeder losses and receiver resistance—and prevents a convenient but unsupported vertical-length multiplier from controlling equipment selection.
Record the Route by Orientation
The route schedule should separate horizontal runs, vertically upward pipe, vertically downward pipe and inclined sections. For each segment, record internal bore, material of construction, elevation change, entry and exit fittings, and any diameter transition.
The bend at the bottom or top of a riser deserves its own entry. A vertical section can perform acceptably while the connecting bend becomes the governing point for wear, pressure fluctuation or particle accumulation. Closely spaced direction changes should also be shown rather than absorbed into one total length.
Evaluate Upward Conveying as a Loaded Section
In an upward riser, the air must maintain particle motion while providing gravitational lift. The pressure gradient is therefore commonly greater than in a comparable horizontal section, but the ratio is not universal. It depends on solids rate, gas velocity, pipe bore, particle properties and conveying mode.
Material that settles easily may need a different velocity margin in the riser than in a horizontal line. The designer should identify the critical section and verify that the actual gas volume at that pressure provides stable transport. Simply doubling vertical metres and calling them horizontal equivalent metres can hide important material behaviour.
Treat Downward Sections as a Separate Flow Problem
Gravity assists particle motion in a downpipe, yet that does not make the section risk-free. Particles can reach the lower bend with high momentum, increasing wear and degradation. In some high-solids conditions, the descending material may also change the static-pressure profile. Any pressure recovery should be supported by material-specific evidence before it is subtracted from the blower duty.
The downstream horizontal transition is often more critical than the drop itself. The gas must establish enough velocity after the lower bend to prevent solids from accumulating. Article 138 addresses this specialist downflow behaviour in detail; the route schedule here ensures that the necessary data are available.
Check Inclines and Mixed Routes
An inclined line may shorten the installed route, but it can encourage solids to rest on the lower wall, especially near minimum transport velocity. Its real effect depends on angle, material, bore and flow regime. If an incline is unavoidable, it should be included explicitly in material testing or in the validated system model.
Mixed routes should be checked at each pressure level. In a positive-pressure line, air expands as pressure falls, so actual velocity usually rises downstream. A bore suitable at the high-pressure feed point may produce excessive velocity after a long rise, while a diameter increase placed before a downflow pressure change can create a local low-velocity region.
Produce the Blower Selection Inputs
The completed route model should provide blower-inlet volume at a stated reference condition and total differential pressure for normal and maximum credible operation. The pressure total includes the blower package, feeder leakage, all pipe orientations, bends, valves, receiver and clean-to-fouled filter resistance.
The project should also state material rate, bulk-solid properties, start-up and purge sequence, ambient temperature, altitude and required control range. These details allow the blower supplier to verify speed, absorbed power, motor capacity and discharge temperature at the actual duty.
Pasifik Blower offers positive-pressure two-lobe and three-lobe roots blowers across a published portfolio range, but each vertical conveying project must fit the selected model’s performance diagram. A route schedule that distinguishes rise, drop and bends gives buyers a more reliable basis than a single equivalent-distance number and helps prevent underestimating the pressure demanded by the installed plant.
Glossary
Elevation change: Difference in vertical level between the beginning and end of a pipeline section.
Inclined section: Pipeline segment installed at an angle between horizontal and vertical orientations.
Lower-bend transition: Direction change that transfers material from a downward section into the following route.
Orientation schedule: Section-by-section record of pipeline direction, bore, elevation and fittings.
Upward riser: Vertical pipeline section through which solids are pneumatically lifted against gravity.
Vertical pressure gradient: Static pressure change per unit length in an upward or downward conveying section.
Vertical-route duty: Combined airflow and pressure requirement associated with the complete orientation-specific route.