A roots blower pneumatic conveying package connects the air source to the feeder, pipeline, receiver and controls. An interface control document assigns the data, limits and responsibilities at each connection before procurement.
An interface control document defines the data exchanged, physical connection, operating limit and responsible party at every boundary.
Set the Blower Package Boundary
The package boundary should identify whether the supply is a bare blower, a base-mounted package or an acoustic enclosure package, then list the included motor, drive, inlet filter, silencers, non-return valve, pressure relief, instruments and controls.
The duty interface states blower-inlet volume at declared pressure and temperature, normal and maximum differential pressure, gas composition, inlet temperature range, site altitude, operating hours and control range. These values allow model, speed, absorbed power, motor rating and discharge temperature to be verified.
The package relief valve protects the blower from excessive differential pressure. It does not provide pipeline dust-explosion protection, receiver venting or normal capacity control.
Define the Air-Piping Interface
The conveying-system designer should provide the connection size, expected pipe reaction, support arrangement, flexible connector location and allowable nozzle loads. Discharge piping must not impose strain on the blower casing.
Pressure loss in supply pipe, silencers and valves forms part of the total duty. The interface also assigns responsibility for thermal expansion, drainage, insulation and any cooler, separator or dryer. These external components can change both pressure and discharge temperature at the feeder.
Define the Feeder Interface
The feeder owner provides required material rate, actual leakage air, operating pressure, venting arrangement and control sequence. Leakage is deducted from the gas available for conveying and can change hopper behavior.
The blower supplier should not be asked to guarantee feeder output from nominal valve displacement. Conversely, the conveying designer needs the blower’s declared airflow-pressure performance to verify that leakage does not reduce pipeline velocity below the stable boundary.
Define the Pipeline and Route Interface
The route owner supplies internal bore, material of construction, length by orientation, bends, valves, branches, transitions and expected service-condition resistance. The design should include the material-specific stability requirement and any upper velocity limit for wear or product quality.
Construction changes require approval because an added bend, smaller hose or altered receiver location changes the blower duty. The final as-built route should be used for commissioning acceptance.
Define the Receiver and Filter Interface
The receiver supplier states maximum actual gas volume, clean and service filter differential pressure, allowable vessel pressure, cleaning requirement and dust-discharge arrangement. The filter must handle normal conveying, leakage and purge cases.
High receiver or filter pressure should be integrated into the feeder and blower sequence. Machine relief settings cannot compensate for an undersized or blinded receiver filter.
Define the Electrical and Control Interface
The control schedule assigns start permissives, feeder sequence, blower speed commands, valve proof, filter readiness, high-pressure and high-temperature alarms, emergency stop and purge logic. It identifies which signals are hardwired, networked or local.
For a variable-frequency drive, the permitted minimum and maximum speed should come from the selected blower data. The process controller requests operation within that range; it does not redefine the machine limit.
Define Safety and Compliance Ownership
The plant or system integrator owns the material-specific hazard assessment, hazardous-area classification, dust containment, explosion prevention/protection, isolation and regulatory compliance. The blower supplier provides equipment data needed for that assessment, such as surface-temperature or instrumentation information available for the package.
Process-air cleanliness depends on machine design, seals, inlet conditions and maintenance. State any purity, hygiene or sterility requirement in the specification and verify it for the selected package.
Close the Interfaces at Acceptance
The final interface document should list approved duty points, tolerances, instruments, test method and performance responsibility. Blower package acceptance covers declared airflow, pressure, speed, power, temperature and protective functions. Conveying-system acceptance covers material throughput, stability, product condition, filter performance and purge.
Close each interface with named owners, approved data, tolerances and test methods. Separate package performance from conveying-system acceptance so commissioning findings can be assigned and resolved without ambiguity.
Glossary
As-built route: Pipeline geometry and equipment arrangement as actually installed, including field changes.
Interface control document: Controlled record defining data, connections, limits and ownership between equipment scopes.
Nozzle load: Force or moment imposed by connected piping on an equipment connection.
Package boundary: Physical and contractual limit identifying what equipment and performance are included in supply.
Responsibility matrix: Schedule assigning each design, supply, control and acceptance obligation to a party.
Signal schedule: List of control and monitoring signals with source, destination and required action.
System integrator: Party responsible for coordinating individual equipment items into the complete operating system.