Predictika · Flexible shaft couplings

An AI sales agent's ELCO coupling selection, checked before it goes out

An AI sales agent prepares a quote for a flexible compression sleeve coupling: the type and size, the compression sleeves, the drive and driven machine, the speed, the ambient temperature, the bores and the rated torque and selection factor it states. Before it goes out, the agent sends it to Predictika, which checks it against a declarative model of the manufacturer's published ELCO-Coupling catalogue and returns a verdict, every reason and the figures it looked up.

Scope: RENK ELCO-Coupling flexible compression sleeve couplings, types N and W in steel (sizes 018 to 454), from the public ELCO catalogue. See everything this validator covers

This validator models selection quotes for ELCO-Couplings of type N and type W as printed in the RENK ELCO-Coupling catalogue, not just the scenarios shown below.

  • Sizing — the selection factor K is the product of the load factor (five machine groups, light or heavy, sleeve U or V/W), the temperature factor (sleeve and ambient temperature band), the switch-on factor and the engine factor; the drive torque from motor power and speed times K must not exceed the rated torque of the size, and a stated rated torque or selection factor must match the catalogue.
  • Speed — the speed limits I and II of each of the 39 sizes; above limit I only steel couplings with hollow bolts and an intermediate ring are allowed, and above limit II the size is not allowed.
  • Bores and type — the finished-bore range of each size for flange 1 and flange 2, type W sizes (259 W, 285 W, 314 W, 319 W, 329 W and 341 W) with both flanges taking the flange 1 range, and type W in steel only in sizes 329 W and 341 W.
  • Sleeve temperature and approvals — the −20 to +80 °C range, no type U sleeves above +70 °C, cast iron only on special request, combustion engine drives that call for a torsional simulation, and switch-on rates above the 360 per hour the table covers.

Any ELCO type N or W selection that touches these rules is in scope — not only the scenarios pictured here. Not covered: prices (RENK publishes no price list for ELCO couplings, so this validator produces no price build-up), types B, S, G, E and X, the series A coupling, permissible misalignment, dynamic balancing, intermediate ring shaft distances, and other RENK product lines. Assumptions: couplings are read as type W when the catalogue lists the size with a W; the switch-on band printed as “< 120–360” is read as 120 to 360 per hour; bore ranges for sizes 378 and above are the overall minimum and maximum of the printed sub-ranges.

The AI sales agentBuilds the coupling selection 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
Click to expand
    
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
Selection factor built from four tablesOnly with workarounds
The factor is the product of a load factor, a temperature factor, a switch-on factor and an engine factor, each from its own table, and the result times the drive torque must be compared with the rated torque of the chosen size; in a rules-based CPQ this is usually custom formulas or code that has to be kept in step with the catalogue.		The four lookups are part of the model, and the factor, the required torque and the comparison are computed on every call.
Speed limits that change what may be builtOnly with care
Each of 39 sizes has two speed limits, and above the first one the build needs steel, hollow bolts and an intermediate ring, so one rule per size or a lookup table is needed and must stay current.		Both limits are looked up from the size and the build is checked against them on every call.
Bore ranges by size and flangeOnly with care
The allowed bore range depends on the size and on the flange, and a type W coupling takes the flange 1 range for both, so the same bore can pass in one place and fail in another.		The ranges are in the model and each bore is checked against its own flange for the type and size quoted.
Type W only in some sizesOnly with care
A size is offered as type W or as type N but not both, which means a list of valid size and type pairs that a rep can easily get wrong.		The size and type pair is checked on every call, together with the steel-only rule for the largest W sizes.
Stated rated torque and selection factor matching the computed onesOnly with workarounds
The figures a quote states are free-entry fields, and comparing them with a computed factor needs a rounding rule that most rule sets do not have.		The stated figures travel with the quote and are compared with the computed ones on every call.
Every problem returned in one answerOnly with workarounds
Rules tend to fire as the quote 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
Click to expand
    
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 drive needs a coupling rated for at least 5,034 Nm (selection factor 1.3); size 247 is rated 4,700 Nm.
2The drive needs a coupling rated for at least 4,782 Nm (selection factor 1.3); size 247 is rated 4,700 Nm.
3The quote states a selection factor of 1.5; the catalogue factors give 1.3.
4The quote states a rated torque of 5,000 Nm; size 247 is rated 4,700 Nm.
5Type U compression sleeves have no temperature factor above +70 degrees C; the quote has 75 degrees C.
6The ambient temperature of 85 degrees C is outside the catalogue range of -20 to +80 degrees C for compression sleeves.
7The ambient temperature of -25 degrees C is outside the catalogue range of -20 to +80 degrees C for compression sleeves.
8The catalogue switch-on factor table ends at 360 switch-ons per hour; the quote has 400; a person should confirm the factor with RENK.
9For a combustion engine drive the catalogue recommends a computerised simulation of the unsteady torsional loads; a person should confirm it has been done.
10The shaft speed is 2,500 rpm, above the 1,800 rpm limit I of size 247; above that limit only steel couplings with hollow bolts and an intermediate ring are allowed.
11The shaft speed is 3,400 rpm; size 247 is rated for 3,300 rpm at most.
12The shaft speed is 7,000 rpm; size 129 is rated for 6,000 rpm at most.
13The flange 1 bore is 121 mm; size 247 takes finished bores from 45 to 120 mm.
14The flange 2 bore is 136 mm; size 247 takes finished bores from 45 to 135 mm in flange 2.
15The flange 1 bore is 44 mm; size 247 takes finished bores from 45 to 120 mm.
16Type W couplings are listed only in sizes 259 W, 285 W, 314 W, 319 W, 329 W and 341 W; the quote has size 247.
17The flange 2 bore is 130 mm; size 259 takes finished bores from 45 to 120 mm in flange 2.
18Size 285 is listed only as a type W coupling in the catalogue, not as type N.
19Size 250 is not an ELCO-Coupling size in the catalogue.
20The catalogue offers cast iron couplings only upon special request with limited availability; a person should confirm with RENK.
21Type W couplings of size 329 are available only in steel.
22The drive needs a coupling rated for at least 35,001 Nm (selection factor 1.9); size 335 is rated 35,000 Nm.
23Type U compression sleeves have no temperature factor above +70 degrees C; the quote has 71 degrees C.
24Size 114 is not an ELCO-Coupling size in the catalogue.

  

  

    
Scenarios and results
Click to expand
    
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. Cement mill drive: Size 335 for a 1,600 kW cement mill at 750 rpm

    
The agent's request. Please quote a type N ELCO-Coupling, size 335, in steel with type U compression sleeves, for an electric motor of 1,600 kW at 750 rpm driving cement mills, piston pumps and similar machines (heavy-weight type). The ambient temperature is 25 degrees C with 10 starts per hour, and the flange bores are 180 mm and 180 mm. The quote states a rated torque of 35,000 Nm and a selection factor of 1.9. It is ready to send.

    
Verdict: Blocked.

    
    
      
  • Rated torque too low. The drive needs a coupling rated for at least 38,710 Nm (selection factor 1.9); size 335 is rated 35,000 Nm.
    • 
    

    
2. Cement mill drive: The agent resubmits after fixing the errors

    
The agent's request. Please quote a type N ELCO-Coupling, size 353, in steel with type U compression sleeves, for an electric motor of 1,600 kW at 750 rpm driving cement mills, piston pumps and similar machines (heavy-weight type). The ambient temperature is 25 degrees C with 10 starts per hour, and the flange bores are 200 mm and 200 mm. The quote states a rated torque of 53,000 Nm and a selection factor of 1.9. It is ready to send.

    
Verdict: Allowed.

    
    
      
  • Catalogue row. Size 353 is rated 53,000 Nm, speed limit I 850 rpm and limit II 1,750 rpm; selection factor 1.9, rated torque needed at least 38,710 Nm; catalogue weight 807 kg.
    • 
    

    
3. ID fan drive: Size 311 for a 700 kW fan at 2,300 rpm

    
The agent's request. Please quote a type N ELCO-Coupling, size 311, in steel with type U compression sleeves, for an electric motor of 700 kW at 2,300 rpm driving large fans, crushers and similar machines. The ambient temperature is 20 degrees C with 10 starts per hour, and the flange bores are 160 mm and 170 mm. The quote states a rated torque of 11,000 Nm and a selection factor of 1.6. It is ready to send.

    
Verdict: Blocked.

    
    
      
  • Speed above limit I needs steel, hollow bolts and a ring. The shaft speed is 2,300 rpm, above the 1,500 rpm limit I of size 311; above that limit only steel couplings with hollow bolts and an intermediate ring are allowed.
    • 
      
  • Flange 2 bore outside the range. The flange 2 bore is 170 mm; size 311 takes finished bores from 65 to 165 mm in flange 2.
    • 
    

    
4. ID fan drive: The agent resubmits after fixing the errors

    
The agent's request. Please quote a type N ELCO-Coupling, size 316, in steel with type U compression sleeves, for an electric motor of 700 kW at 2,300 rpm driving large fans, crushers and similar machines. The ambient temperature is 20 degrees C with 10 starts per hour, and the flange bores are 160 mm and 170 mm, with hollow bolts and an intermediate ring. The quote states a rated torque of 16,000 Nm and a selection factor of 1.6. It is ready to send.

    
Verdict: Allowed.

    
    
      
  • Catalogue row. Size 316 is rated 16,000 Nm, speed limit I 1,250 rpm and limit II 2,500 rpm; selection factor 1.6, rated torque needed at least 4,651 Nm; catalogue weight 272 kg.
    • 
    

    
5. Diesel generator set: Type W coupling for a 350 kW diesel generator set

    
The agent's request. Please quote a type W ELCO-Coupling, size 247, in steel with type U compression sleeves, for a diesel engine with 3 to 6 cylinders of 350 kW at 1,500 rpm driving belt conveyors, pumps and similar machines. The ambient temperature is 20 degrees C with 10 starts per hour, and the flange bores are 125 mm and 125 mm. The quote states a rated torque of 4,700 Nm and a selection factor of 1.96. It is ready to send.

    
Verdict: Blocked.

    
    
      
  • Type W is not offered in this size. Type W couplings are listed only in sizes 259 W, 285 W, 314 W, 319 W, 329 W and 341 W; the quote has size 247.
    • 
      
  • Flange 1 bore outside the range. The flange 1 bore is 125 mm; size 247 takes finished bores from 45 to 120 mm.
    • 
      
  • Flange 2 bore outside the range. The flange 2 bore is 125 mm; size 247 takes finished bores from 45 to 120 mm in flange 2.
    • 
      
  • Combustion engine drive. For a combustion engine drive the catalogue recommends a computerised simulation of the unsteady torsional loads; a person should confirm it has been done.
    • 
    

    
6. Diesel generator set: The agent resubmits after fixing the errors

    
The agent's request. Please quote a type W ELCO-Coupling, size 285 W, in steel with type U compression sleeves, for a diesel engine with 3 to 6 cylinders of 350 kW at 1,500 rpm driving belt conveyors, pumps and similar machines. The ambient temperature is 20 degrees C with 10 starts per hour, and the flange bores are 125 mm and 125 mm. The quote states a rated torque of 8,500 Nm and a selection factor of 1.96. It is ready to send.

    
Verdict: Needs approval.

    
    
      
  • Combustion engine drive. For a combustion engine drive the catalogue recommends a computerised simulation of the unsteady torsional loads; a person should confirm it has been done.
    • 
      
  • Catalogue row. Size 285 is rated 8,500 Nm, speed limit I 1,650 rpm and limit II 3,000 rpm; selection factor 1.96, rated torque needed at least 4,368 Nm; catalogue weight 126 kg.
    • 
    

  

  

    
Narration transcript
Click to expand
    
The text of the narrated walkthrough, step by step.

    
    
      
  1. Welcome to a demo of Predictika's Validator. An AI sales agent prepares a quote for a flexible compression sleeve coupling: the type and size, the compression sleeves, the drive and driven machine, and more. Before it goes out, the agent sends it to Predictika, which checks it against a declarative model of the manufacturer's published ELCO-Coupling catalogue and returns a verdict, every reason and the figures it looked up.
    2. 
      
  2. I will start with the first request by the agent.
    3. 
      
  3. The agent says. Please quote a type W ELCO-Coupling, size 247, in steel with type U compression sleeves, for a diesel engine with 3 to 6 cylinders of 350 kW at 1,500 rpm driving belt conveyors. The ambient temperature is 20 degrees C with 10 starts per hour, and the flange bores are 125 mm and 125 mm. The rest of the request is on screen.
    4. 
      
  4. Before it goes out, the agent calls the validator.
    5. 
      
  5. Blocked, with three findings and one approval, all in one answer. Type W couplings are listed only in sizes 259 W, 285 W, 314 W, 319 W, 329 W and 341 W; the quote has size 247. The flange 1 bore is 125 mm; size 247 takes finished bores from 45 to 120 mm. The flange 2 bore is 125 mm; size 247 takes finished bores from 45 to 120 mm in flange 2.
    6. 
      
  6. The validator returned three blocking findings and one approval 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.
    7. 
      
  7. What this shows: for bore ranges by size and flange, a rules-based CPQ is error-prone for this.
    8. 
      
  8. Now the agent resubmits.
    9. 
      
  9. The corrected request. It changes the size to 285 W and the rated torque on the quote to 8,500.
    10. 
      
  10. It calls the validator again.
    11. 
      
  11. Not blocked, but held for a person.
    12. 
      
  12. The three blocking findings are cleared; one approval remains for a person: combustion engine drive.
    13. 
      
  13. Four problems caught in one call, fixed in one pass, and the corrected quote now goes to a person for approval. That is the value of Predictika's validator: catching mistakes before they reach the customer. Now you can try the other scenarios yourself.
    14.