Predictika · Liquid ring pump proposals

An AI sales agent's liquid ring pump proposal, checked before it goes out

An AI sales agent prepares a proposal for a Graham liquid ring vacuum pump or compressor: the model, the duty, the service liquid, the shaft seals, the motor mount and the discharge piping. Before it goes out, the agent sends it to Predictika, which checks it against a declarative model of the operating limits, tables and installation notes in Graham's public Series 1 and 2 manual, and returns a verdict, every reason and the figures it computed.

Scope: Graham Series 1 and 2 liquid ring vacuum pumps and compressors (35 models, PV31040 to PV92670): operating limits, seals, motor mount, piping and weights. See everything this validator covers

This validator models the Graham Series 1 and 2 liquid ring vacuum pumps and compressors only (the 17 single stage and 18 two stage PV/PC models listed in the manual), not just the scenarios shown below. It does not cover Graham's steam jet ejectors, condensers, Heliflow heat exchangers, Series 3 or MV pumps.

  • Vacuum reach — the lowest suction pressure the arrangement can reach on water at 59 F: 150 mmHgA for single stage pumps, 25 mmHgA for two stage pumps, and 3 mmHgA for a two stage pump with an atmospheric air ejector (the ejector is added to two stage pumps only).
  • Compressor service — the differential pressure must not exceed 20 psi for a single stage compressor or 30 psi for a two stage compressor.
  • Shaft seals — with mechanical seals and contaminated service liquid, each seal needs an external flush of 0.25 to 0.5 GPM of clean, filtered liquid at 10 psi above the discharge pressure.
  • Motor mount and piping — the C-face motor adapter is offered on size 30000 through 50000 pumps; a discharge leg may rise at most 24 inches; a trap is required when the discharge pressure is above atmospheric.
  • Service liquid flow — compared with the nominal flow for the model in the manual (35 models); a different flow needs Graham to confirm it, because too little flow loses capacity and too much raises the horsepower.
  • Dry weight — the weight the proposal states is compared with the manual's estimated dry weight for the model in cast iron, or in stainless steel, carbon steel or bronze.

Any proposal for these pumps that touches these rules is in scope — not only the scenarios pictured here. Not covered: prices (Graham publishes no price list, so this validator produces no price build-up or line-item quote), pump capacity at a given suction pressure (the manual gives performance curves, not tables), motor sizes, the full model code (materials and special-feature codes are available from Graham on request), and every other Graham product.

The AI sales agentBuilds the pump proposal from the conversation and says it is ready.
Predictika validatorChecks every rule at once and returns the verdict, each finding, and the computed figures.

6 scenarios in 3 groups · each group runs from the agent’s first attempt to the outcome · click one to switch

What the agent proposes

The AI sales agent says

Illustrative agent statement. The validator receives the structured request below.

Proposing agent: AI sales agent (scripted)

Before sending, the agent must call Recorded run

Predictika validator


      

        
        
        
      

      
Waiting for the call.

      
    

  

  
  

    
Where rules-based CPQ gets it wrong
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Our assessment of what a typical rules-based CPQ (product rules, price rules and validation rules, as in Salesforce CPQ) does with the same cases. It is a judgment about effort and reliability, not a claim that nothing can be built.

    
What the validator caughtTypical rules-based CPQPredictika
A vacuum limit that depends on the stage count and on an optional air ejectorOnly with care
The reachable suction pressure is 150, 25 or 3 mmHgA depending on the model and on whether an air ejector is added, and the ejector is allowed only on two stage pumps; a rules-based CPQ needs a rule for each combination.		The limit is computed from the model and the ejector choice on every call, and each boundary (one mmHgA either side) is tested.
A compressor limit that depends on the stage count, but only for compressor dutyOnly with care
The 20 and 30 psi limits apply to compressors only and vacuum duty must ignore them; each duty needs its own set of conditional rules.		The duty, the stage count and the limit are evaluated together, and a differential entered on a vacuum pump is correctly ignored.
A seal flush window that applies only to mechanical seals on contaminated liquidOnly with workarounds
The rule fires on three attributes at once (seal type, liquid, flush rate and pressure), and the range check has to be written for both the flow and the pressure.		The condition and the 0.25 to 0.5 GPM and 10 psi window are one rule, tested at and just outside each edge.
A service liquid flow that is allowed but needs Graham to confirm it when it differs from nominalOnly with care
A CPQ either blocks or allows; a flow above or below nominal is neither wrong nor settled, so it needs an approval step wired to the nominal flow of the chosen model.		The nominal flow for each of the 35 models is part of the model, and a different flow returns a needs-approval verdict with the reason.
Every problem returned in one answerOnly with workarounds
Rules tend to fire as the proposal is saved or a step is completed, so a rep often fixes one error and meets the next.		All findings come back together, whatever order the choices arrived in.

  

  

    
What this validator catches: findings from its test cases
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Every rule is checked on every call, in any order the choices arrive; one problem never hides another. Blocking findings stop the quote; approval findings need a person to sign off; everything else is computed.

    
1The suction pressure of 149 mmHgA is below the 150 mmHgA this pump arrangement can reach on water service liquid at 59 F; single stage pumps reach 150 mmHgA, two stage pumps 25 mmHgA, and two stage pumps with an atmospheric air ejector 3 mmHgA.
2The suction pressure of 24 mmHgA is below the 25 mmHgA this pump arrangement can reach on water service liquid at 59 F; single stage pumps reach 150 mmHgA, two stage pumps 25 mmHgA, and two stage pumps with an atmospheric air ejector 3 mmHgA.
3The suction pressure of 2 mmHgA is below the 3 mmHgA this pump arrangement can reach on water service liquid at 59 F; single stage pumps reach 150 mmHgA, two stage pumps 25 mmHgA, and two stage pumps with an atmospheric air ejector 3 mmHgA.
4An atmospheric air ejector is added to a two stage pump; this model is single stage.
5The compressor differential of 21 psi is above the 20 psi maximum for this pump (20 psi single stage, 30 psi two stage).
6The compressor differential of 31 psi is above the 30 psi maximum for this pump (20 psi single stage, 30 psi two stage).
7A discharge leg may rise at most 24 inches above the pump discharge flange; 25 inches would overload the motor and reduce capacity.
8A trap is required in the discharge piping when the discharge pressure is above atmospheric pressure.
9The C-face motor adapter is available on size 30000 through 50000 pump assemblies; this model is size 60000.
10With contaminated service liquid each mechanical seal must be flushed externally with 0.25 to 0.5 GPM of clean, filtered liquid at 10 psi above the discharge pressure; the flush on the proposal is outside that.
11The proposal states a dry weight of 376 lbs, but the manual gives 377 lbs for this model in this material.
12The proposal states a dry weight of 377 lbs, but the manual gives 396 lbs for this model in this material.
13The proposed service liquid flow of 6 GPM is below the nominal 8 GPM for this pump; the manual says too little flow loses capacity, so Graham should confirm it.
14The proposed service liquid flow of 10 GPM is above the nominal 8 GPM for this pump; the manual says too much flow raises the horsepower required, so Graham should confirm it.
15The proposal states a dry weight of 400 lbs, but the manual gives 377 lbs for this model in this material.
16The proposal states a dry weight of 500 lbs, but the manual gives 582 lbs for this model in this material.
17The suction pressure of 10 mmHgA is below the 25 mmHgA this pump arrangement can reach on water service liquid at 59 F; single stage pumps reach 150 mmHgA, two stage pumps 25 mmHgA, and two stage pumps with an atmospheric air ejector 3 mmHgA.
18A discharge leg may rise at most 24 inches above the pump discharge flange; 30 inches would overload the motor and reduce capacity.

  

  

    
Scenarios and results
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The recorded result of the validator for each scenario on this page: the request the AI agent sent, the verdict, and every finding, in the order they appear above.

    
1. Deep vacuum duty: A two stage pump pulling 20 mmHgA

    
The agent's request. Please propose a Graham PV52160 two stage liquid ring vacuum pump in cast iron for a process plant, pulling a suction pressure of 20 mmHgA, mechanical shaft seals, clean service liquid, a foot-mounted motor, without an air ejector, discharge at atmospheric pressure, a discharge leg of 12 inches, a service liquid flow of 8 GPM. The proposal states a dry weight of 377 lbs. It is ready to send.

    
Verdict: Blocked.

    
    
      
  • Suction pressure below what this pump can reach. The suction pressure of 20 mmHgA is below the 25 mmHgA this pump arrangement can reach on water service liquid at 59 F; single stage pumps reach 150 mmHgA, two stage pumps 25 mmHgA, and two stage pumps with an atmospheric air ejector 3 mmHgA.
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2. Deep vacuum duty: The agent resubmits after fixing the errors

    
The agent's request. Please propose a Graham PV52160 two stage liquid ring vacuum pump in cast iron for a process plant, pulling a suction pressure of 20 mmHgA, mechanical shaft seals, clean service liquid, a foot-mounted motor, with an atmospheric air ejector, discharge at atmospheric pressure, a discharge leg of 12 inches, a service liquid flow of 8 GPM. The proposal states a dry weight of 377 lbs. It is ready to send.

    
Verdict: Allowed.

    
    
      
  • Pump summary. Nominal service liquid flow 8 GPM; dry weight 377 lbs.
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3. Process gas compressor: A single stage compressor at 25 psi differential

    
The agent's request. Please propose a Graham PV61335 single stage liquid ring compressor in stainless steel, carbon steel or bronze for a process plant, compressing at a differential of 25 psi, mechanical shaft seals, clean service liquid, a foot-mounted motor, without an air ejector, discharge above atmospheric pressure with a trap, a discharge leg of 18 inches, a service liquid flow of 25 GPM. The proposal states a dry weight of 740 lbs. It is ready to send.

    
Verdict: Blocked.

    
    
      
  • Compressor differential pressure too high. The compressor differential of 25 psi is above the 20 psi maximum for this pump (20 psi single stage, 30 psi two stage).
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4. Process gas compressor: The agent resubmits after fixing the errors

    
The agent's request. Please propose a Graham PV62240 two stage liquid ring compressor in stainless steel, carbon steel or bronze for a process plant, compressing at a differential of 25 psi, mechanical shaft seals, clean service liquid, a foot-mounted motor, without an air ejector, discharge above atmospheric pressure with a trap, a discharge leg of 18 inches, a service liquid flow of 24 GPM. The proposal states a dry weight of 644 lbs. It is ready to send.

    
Verdict: Allowed.

    
    
      
  • Pump summary. Nominal service liquid flow 24 GPM; dry weight 644 lbs.
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5. Contaminated service liquid: A size 70000 pump on contaminated service liquid

    
The agent's request. Please propose a Graham PV71300 single stage liquid ring vacuum pump in cast iron for a process plant, pulling a suction pressure of 200 mmHgA, mechanical shaft seals, contaminated service liquid, a C-face motor adapter, without an air ejector, discharge at atmospheric pressure, a discharge leg of 10 inches, a service liquid flow of 30 GPM. The proposal states a dry weight of 1,190 lbs. It is ready to send.

    
Verdict: Blocked.

    
    
      
  • C-face motor adapter not offered on this size. The C-face motor adapter is available on size 30000 through 50000 pump assemblies; this model is size 70000.
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  • External seal flush out of range. With contaminated service liquid each mechanical seal must be flushed externally with 0.25 to 0.5 GPM of clean, filtered liquid at 10 psi above the discharge pressure; the flush on the proposal is outside that.
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6. Contaminated service liquid: The agent resubmits after fixing the errors

    
The agent's request. Please propose a Graham PV71300 single stage liquid ring vacuum pump in cast iron for a process plant, pulling a suction pressure of 200 mmHgA, mechanical shaft seals, contaminated service liquid, a foot-mounted motor, without an air ejector, discharge at atmospheric pressure, a discharge leg of 10 inches, a service liquid flow of 30 GPM, an external seal flush of 0.40 GPM per seal at 10 psi above the discharge pressure. The proposal states a dry weight of 1,190 lbs. It is ready to send.

    
Verdict: Allowed.

    
    
      
  • Pump summary. Nominal service liquid flow 30 GPM; dry weight 1,190 lbs.
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Narration transcript
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The text of the narrated walkthrough, step by step.

    
    
      
  1. Welcome to a demo of Predictika's Validator. An AI sales agent prepares a proposal for a Graham liquid ring vacuum pump or compressor: the model, the duty, the service liquid, and more. Before it goes out, the agent sends it to Predictika, which checks it against a declarative model of the operating limits, tables and installation notes in Graham's public Series 1 and 2 manual, and returns a verdict, every reason and the figures it computed.
    2. 
      
  2. I will start with the first request by the agent.
    3. 
      
  3. The agent says. Please propose a Graham PV71300 single stage liquid ring vacuum pump in cast iron for a process plant, pulling a suction pressure of 200 mmHgA. The proposal states a dry weight of 1,190 lbs. The rest of the request is on screen.
    4. 
      
  4. Before it goes out, the agent calls the validator.
    5. 
      
  5. Blocked, with two findings, all in one answer. The c-face motor adapter is available on size 30000 through 50000 pump assemblies; this model is size 70000. With contaminated service liquid each mechanical seal must be flushed externally with 0.25 to 0.5 GPM of clean, filtered liquid at 10 psi above the discharge pressure; the flush on the proposal is outside that.
    6. 
      
  6. The validator returned two blocking findings in one answer. A check that reads one field at a time would pass most of this; it shows only when the choices in the quote are checked against each other.
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  7. What this shows: for a seal flush window that applies only to mechanical seals on contaminated liquid, a rules-based CPQ can do this only with workarounds.
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  8. Now the agent resubmits.
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  9. The corrected request. It changes the motor mount to foot-mounted motor. It sets the external seal flush to 0.40 GPM per seal at 10 psi above discharge.
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  10. It calls the validator again.
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  11. This time the validator clears it.
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  12. Both earlier findings are cleared, and the validator's figure matches the quote.
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  13. Two problems caught in one call, fixed in one pass, and a clean quote. That is the value of Predictika's validator: catching mistakes before they reach the customer. Now you can try the other scenarios yourself.
    14.