How do I select an ANSI pump performance curve?

Start with required flow, head, fluid, concentration, temperature and available NPSH. Engineering then confirms speed, impeller diameter, material and seal arrangement against the final curve.

What is the best efficiency point on a pump curve?

The best efficiency point, or BEP, is the capacity range where a pump operates with its highest hydraulic efficiency. Operating near BEP generally supports stable hydraulic performance and lower operating stress.

Can a G196 pump replace a Goulds 3196 or a Mark III equivalent replace a Durco Mark III?

Interchangeability is reviewed against the exact pump model, frame, interfaces, duty point and material requirement. Final compatibility should be confirmed by engineering before quotation and manufacture.

What information is needed for an engineering curve review?

Provide flow, head, fluid, concentration, temperature, solids, pressure, any existing pump model and available NPSH. A datasheet, nameplate photo or prior curve is helpful but not required to start.

ANSI B73.1 / PERFORMANCE SELECTION

ANSI Pump Performance Curves – 3196 & Durco Mark III Replacement Selection

Read the curve. Match the pump.

Review G196 / Goulds 3196 reference coverage and D Mark III / Durco Mark III hydraulic families by flow, head and operating speed. Use the maps for preliminary screening, then confirm impeller, efficiency, power, NPSH, material and dimensional fit before quotation.

Explore curve coverage ->Send pump data ->

G196 + D Mark IIIANSI/ASME B73.1 pump families shown in the Yingsiman product brochure.

7,000 GPMG196 reference capacity

730 ftG196 reference head

7,500 US gpmD Mark III reference flow

990 ftD Mark III reference head

01 / How to use this page

A pump curve is a selection map.

The horizontal axis shows capacity. The vertical axis shows total head. The shaded envelopes below connect specific pump sizes with speed and operating range. Final selection still requires the duty point, fluid conditions, NPSH and construction review.

Define duty

Flow, head, fluid and operating temperature.

Locate the point

Compare the duty point with the pump-size envelope.

Verify the build

Confirm speed, impeller, materials and seals.

Engineering guide

How to Read an ANSI Pump Performance Curve

1. Flow / Capacity – Q

Start with the required flow rate in GPM or m3/h.

2. Total Head – H

Match the required total dynamic head in ft or m at the target flow.

3. Impeller Diameter

Verify the impeller diameter or trim associated with the required operating point.

4. Efficiency + Power

Review the efficiency region and driver power requirement instead of selecting on head and flow alone.

5. NPSHr

Confirm available suction margin against the NPSH required by the selected pump and speed.

Need a full curve-reading guide? Read the centrifugal pump curve guide ->

G196 SERIES / ANSI PUMPS

G196 / 3196 Reference Hydraulic Coverage

Coverage map bands: 3,500 / 2,850 RPM and 1,750 / 1,450 RPM. Individual catalog curves may use actual rated speed for the selected size.

Family Coverage

G196 speed view

Coverage speed vs. individual curve speed The overview map groups hydraulic families around nominal 50 Hz / 60 Hz speed bands. Individual catalog curves may be published at the actual rated pump speed for that size and motor configuration, so values such as 2900, 2965, 3560, 3570, 1470, 1780 RPM and other nearby speeds can appear in source curves.

Hydraulic Coverage Map redrawn from the Yingsiman brochure p.6 and checked against CHEM-1A p.12. It is for preliminary screening, not a certified pump-specific curve.

CapacityUp to 7,000 GPMMetric capacity value is being source-verified before publication.

HeadUp to 730 ft / 223 mPublished family reference envelope

TemperatureUp to 700°F / 371°CConfiguration and service qualification required

PressureUp to 375 PSIG / 2,586 kPaConfiguration and service qualification required

Internal frame referenceSTX / MTX / LTX / XLTXANSI Pumps Pro / Yingsiman internal terminology

OEM Goulds reference uses XLT-X. Internal G196 replacement terminology uses XLTX. Published family limits do not mean every size, speed, material and impeller configuration reaches every maximum simultaneously.

Engineering boundary

What This Coverage Map Can – and Cannot – Confirm

Can help identify

Likely hydraulic family
Approximate pump-size region
Applicable speed family
Whether the duty point appears inside the published family coverage

Still requires engineering confirmation

Exact pump size and impeller diameter
Efficiency, power / motor size and NPSHr
Viscosity correction and suction margin
Material, seal chamber and dimensional compatibility

D MARK III SERIES / ANSI PUMPS

D Mark III Family Reference Performance

Group coverage shown at 3,500 / 2,900 RPM and 1,750 / 1,450 RPM. Family-level brochure limits are for preliminary screening.

Family Coverage

D Mark III group view

High speed: 3,500 RPM / 60 Hz and 2,900 RPM / 50 Hz. Low speed: 1,750 RPM / 60 Hz and 1,450 RPM / 50 Hz.

Family Coverage Map redrawn from the Yingsiman brochure p.11. No D Mark III efficiency, BHP / kW, NPSHr, trim or certified pump-specific curve is implied.

FlowUp to 7,500 US gpm / 1,700 m3/hFamily reference envelope

HeadUp to 990 ft / 300 mFamily reference envelope

PressureUp to 400 psi / 27 barFinal application review required

Temperature-100°F to 700°F / -73°C to 370°CFinal application review required

Hydraulic structureGroup 1 / Group 2 / Group 310×8-17: Max speed 1450 RPM

Final pump size, impeller, speed, material, seal arrangement and motor selection must be confirmed for the actual duty point. Need a configuration-specific curve? Send the duty point for engineering review ->

02 / Engineering matching

From installed pump to replacement.

A curve review is more than reading flow and head. It connects hydraulic duty with the exact pump size, speed, impeller, wet-end material and power-end configuration.

Existing pump

Have a nameplate or old curve?

Send the information you have. A complete datasheet is helpful, but an initial review can begin with partial information.

Existing pump model and size
Flow, head and speed
Fluid, concentration and temperature
Nameplate or existing curve upload

Start an engineering review ->

Configuration review

Confirm the build behind the curve.

Before quotation, review the components that affect fit, service and replacement confidence.

Wet-end materials and casing
Impeller and shaft / shaft sleeve
Seal chamber and mechanical seal
Frame, bearing housing and power end

Request a replacement quote ->

Goulds 3196 replacement selection Goulds 3196 replacement parts Durco Mark III replacement selection Durco Mark III parts ANSI pump selection support Chemical resistance guide Technical downloads

03 / Buyer questions

What engineers usually need to confirm.

These questions turn a technical resource into a useful selection tool for maintenance, procurement and project teams.

Can you match a 3196 or MKIII replacement?

Yes, the review should compare the exact pump size, frame, interfaces, duty point, material and seal arrangement before quotation.

What if the original curve is missing?

Send the pump nameplate, model, size, operating duty and fluid conditions. The available information determines the next review step.

Do materials change the selection?

Wet-end materials can be reviewed in WCB, 316SS / CF8M, CD4M / CD4MCu, Alloy 20 / CN7M, Hastelloy, Nickel, Titanium and other approved alloy options, depending on configuration and service conditions.

Can I buy a bare pump or parts?

Use the RFQ to specify whether you need a complete replacement pump, wet-end parts, power-end parts or a component cross-reference.

Replacement Materials Available

Final material selection must consider fluid composition, concentration, temperature, solids, velocity and actual corrosion history. Not every material is available for every pump size without engineering confirmation.

Review the chemical resistance guide ->

04 / Request a review

Send the duty point.
We’ll return the curve context.

Share the information available from your installed pump or process. Candidate hydraulic family identified – exact size requires engineering review.

G196 / 3196 replacement review
D Mark III / MKIII replacement review
Wet-end and power-end parts matching
Materials and seal arrangement review

Quick curve review

Core fields stay short. Add suction / fluid details only when available.

Core: family, existing model / size, flow, head / TDH, frequency or RPM, fluid, temperature, material, name and company email.

Add suction / fluid details (optional)

Specific gravity / densityViscosityConcentrationSolids contentNPSHa or suction pressureSuction condition / static liftExisting impeller diameterMotor powerSeal type / seal chamberOperating issue / reason for replacement