Equipment reference
In-line pumps
In-line describes aligned suction and discharge connections. Compare access, support and motor orientation separately from hydraulic performance.
Connections on one line
The pump can fit into a straight pipe run because its inlet and outlet share an axis. The liquid path inside the casing still passes through the impeller. Connection alignment does not prescribe the shaft orientation or guarantee interchangeable dimensions.
In-line pumps in circulation circuits
Check permitted shaft and terminal-box positions in the installation drawing. A vertical motor arrangement does not mean a wet rotor. Confirm motor cooling, space for lifting and the route for removing the drive or hydraulic assembly.
For circulation, choose flow from the circuit demand and head from its losses, then check the in-line dimensions and wet- or dry-rotor execution. Matching pipe centres cannot establish hydraulic suitability.
Pipework and supports
Connect without forcing misaligned pipes into position. Supports must carry the specified mass and pipe loads; the flanges should not act as a correction for poor alignment. Decide isolation, drainage and service clearance before installation.
Fit and duty together
Match connection size and standard, installation length, pressure rating and materials, then verify the complete operating range. For replacement, record the old model and drawing revision: equal nominal connection sizes do not prove equal duty or fit.
In-line and multistage construction
An in-line connection arrangement may accompany several centrifugal stages. The aligned nozzles describe the pipe interface; successive stages describe how head is added. Confirm the actual drawing, stage count, pressure limits and service envelope rather than inferring them from the name.