Replacement identification guide
How to Read a Pump Nameplate and Drawing for Replacement
Useful pump nameplate fields for a replacement include the manufacturer and brand, model or type series, pump size, serial, order or job number and construction or material code, plus speed, rated duty and impeller diameter where shown. The serial or order number links the pump to the production record of the manufacturer named on the plate. The nameplate identifies the equipment record; drawings and dimensions identify what must fit; duty data confirms what the replacement must perform.
Identification evidence
One reference is never the whole answer
Use independent evidence to resolve unclear characters, revisions and internal parts before manufacture.
A pump nameplate is the fastest starting point for a replacement enquiry, but it is rarely the only evidence required. The nameplate identifies the equipment record; the drawing and part information identify what must fit; the duty information confirms what must perform.
Before sending an urgent RFQ, collect the following evidence while the equipment and documents are still accessible.
Pump Plate vs Motor Plate
Industrial pump sets commonly have separate identification plates for the pump and motor. Do not send only the motor plate. Motor voltage, power and speed do not identify the pump casing, impeller, frame or internal parts.
Photograph both plates and label them clearly. If a gearbox, coupling guard or auxiliary system has its own plate, photograph that separately as well.
| Pump nameplate | Motor nameplate | |
|---|---|---|
| What it identifies | The pump: make and brand, model or type series, size, serial or order number, construction code | The driver only: voltage, power, speed, frame and enclosure |
| What it decides for a parts review | Which casing, impeller, cover, frame and internal parts apply | Nothing about the pump casing, impeller, frame or internal parts |
| What to send | One straight, full-frame photograph plus close-ups of weak fields | A separate, clearly labelled photograph so the two plates are not confused |
Pump Nameplate Fields to Capture
The exact layout varies, but useful fields may include:
| Nameplate field | What it records | Why it matters for a replacement |
|---|---|---|
| Manufacturer and brand | Who built the pump and under which brand | Decides which parts list, sectional drawing and dimensional pattern the review starts from |
| Model or type series | The pump family and its variant | Sets which sectional drawing and part positions apply |
| Pump size | The nozzle and impeller size code used by that maker | Identifies the hydraulic and the dimensional envelope |
| Serial, order or job number | The link to the manufacturer’s production record | The strongest single reference: manuals commonly ask for it together with model and size when ordering parts |
| Construction or material code | The materials the unit was built in | Must be compared with the physical pump, because earlier repairs may have changed components |
| Speed and rated duty (where shown) | The duty the pump was sold against | Shows whether the pump still runs near its original selection |
| Impeller diameter (where shown) | The impeller trim fitted at despatch | A trimmed impeller changes head and power, so the current trim is confirmed before a part is made |
| Customer equipment tag | The plant’s own tag number | Ties the pump to site records, drawings and maintenance history |
| Manufacturing date or revision | When the unit was built or last revised | Indicates which drawing revision and parts generation applies |
The serial or order number can be especially important because it links the equipment to the manufacturer’s production record. Official pump manuals commonly instruct customers to provide the serial number, model and size when ordering parts.
How to Photograph the Nameplate
- Clean the plate without removing stamped or printed information.
- Take one straight, full-frame photograph.
- Take close-ups of weak or damaged fields.
- Avoid flash glare and steep angles.
- Record uncertain characters separately; do not guess whether a character is
0/O,1/Ior5/S. - Photograph the plate’s location on the equipment so the reviewer knows which component it identifies.
Drawings That Help a Replacement Review
General arrangement drawing
This drawing helps review nozzles, footprint, shaft centerline, baseplate, coupling and service clearances. It is important when a dimensional replacement is required.
Sectional or cross-sectional drawing
A sectional drawing shows the internal components and item numbers. Mark the required part directly on the drawing and include the item name and part number.
Performance curve
The curve connects the pump size, speed and impeller to head, flow, efficiency, power and NPSH information. It is needed when the hydraulic component or complete pump is being replaced.
Bill of materials
The bill of materials may identify construction codes and material grades for individual components. It should be compared with the physical unit and purchase record because previous repairs may have changed components.
Part Photographs and Measurements
For an individual replacement part, photograph:
- the complete part from several sides;
- casting marks and stamped numbers;
- machined fits, bores, keyways and threads;
- wear, cracks, erosion or corrosion;
- the mating parts when accessible.
Record critical dimensions with the measuring tool and method. A ruler in a photograph is useful for orientation but is not a substitute for an agreed dimensional inspection.
When no drawing exists, these photographs and measurements are also where reverse engineering a replacement part starts.
Information That a Nameplate Cannot Confirm Alone
A nameplate may not confirm:
- the current impeller trim;
- internal wear or previous modifications;
- the material of every wetted component;
- current seal-face and elastomer materials;
- whether the present pump still matches the original duty;
- whether two internal parts are interchangeable.
This is why a replacement review may require the curve, drawings, material records, dimensions and operating data in addition to the plate.
Replacement Enquiry Package
Send one folder containing:
- Pump nameplate photo.
- Motor nameplate photo.
- General arrangement and sectional drawing.
- Performance curve and data sheet.
- Required part name, item number and quantity.
- Part photographs and critical dimensions.
- Material grade and required certificates.
- Current flow, head, liquid and temperature when hydraulics are involved.
- Failure description and required delivery date.
- Delivery destination and contact for technical questions.
If the pump plate shows a Goulds 3196 or Durco Mark 3 size designation, the Goulds 3196 pattern parts and Durco Mark 3 pattern parts pages list casing, impeller, cover and power-end references by size and frame or Group, each with the OEM part number it corresponds to. Where the OEM part number is known, add it next to the part name and item number; the fit is still confirmed from the rest of the package.
What Happens Next
The supplier should separate confirmed data from open questions. Identification is complete only when the available nameplate, drawing, dimensions, construction and duty evidence support the proposed item. If the evidence conflicts, resolve the conflict before manufacture rather than relying on the most convenient reference.
Pump Nameplate FAQ
How do you read a pump nameplate?
Work through it field by field: manufacturer and brand, model or type series, pump size, serial or order number, construction or material code, and the speed, rated duty and impeller diameter where they are shown. Photograph the plate straight on, and record uncertain characters separately rather than guessing between 0 and O or 1 and I.
What information is on a pump nameplate?
Most plates carry the manufacturer and brand, model or type series, pump size, a serial, order or job number, and a construction or material code. Many also show speed, rated duty, impeller diameter, the customer equipment tag and a manufacturing date or revision. Layout varies by maker, so read every field before assuming one is missing.
What is the purpose of a pump nameplate?
It identifies the individual unit so that parts, drawings and service records can be traced back to the original build. The serial or order number carries the most weight, because it links the pump to the manufacturer’s production record; manuals commonly ask for the serial number, model and size when ordering parts.
What is the difference between a pump nameplate and a motor nameplate?
A pump set usually carries two plates. The pump plate identifies the casing, impeller, frame and internal parts; the motor plate records voltage, power, speed and frame for the driver only. Motor data cannot identify pump parts, so photograph both plates and label them clearly.
What can a pump nameplate not confirm on its own?
It cannot confirm the current impeller trim, internal wear or earlier modifications, the material of every wetted component, current seal-face and elastomer materials, or whether the pump still matches its original duty. Those come from drawings, the bill of materials, measurements of the removed part and the operating data.
Need a Project-Specific Review?
Send the actual duty, liquid, identification evidence and required supply scope. Published guidance does not replace a model- and order-specific technical review.