PLEXUS EXAMPLE · 04

Line register vs Basis of Design

Fifteen lines against three BoD rules: design pressure, design temperature and insulation checked, conflicts flagged for review.

Input

BASIS OF DESIGNACD-BOD-0001

Basis of Design & Operation/Control Philosophy

Revision: Rev 0
Section: 3.6 Design rules and margins
Scope: Design pressure, temperature, insulation

LINE REGISTERACD-REG-0001

Master Tag Registers, Lines sheet

Revision: Rev 0
Filter: ACD-300-001
Lines: 15

Design pressuremax(1.10 x op, op + 175 kPa), rounded up to the next 25 kPa. Pump discharge lines follow shutoff head + max suction pressure instead.

Design temperatureMaximum operating temperature + 15 deg C minimum.

Insulation codeRegister column matches the line-number suffix and the service temperature. Codes per BoD: H hot, C cold, ET traced, N none.

The source documents are not shown: registers and design bases stay inside your project. The check below runs on a hypothetical plant (ACD), presented the way consistency results arrive.

What Plexus does

01Reads the line register and the BoD design rules into one structure.
02Computes the required design pressure and temperature for each line from its operating values.
03Compares register values and insulation codes against the rules.
04Marks each result pass, conflict or check; the engineer confirms and corrects the register.

Output

0 / 45 rule checksrun first, then export

This animation illustrates the Plexus workflow on a hypothetical plant (ACD). In the product, rule checks run server-side and every value keeps provenance to its source document; an engineer reviews and confirms.

Source documents: ACD-BOD-0001 Rev 0 and ACD-REG-0001 Lines sheet, hypothetical plant

Line and operating conditions	Design pressure	Design temperature	Insulation code
DN200-EFG-3001-1SS1-Hop 150 deg C · 320 kPa(g)	500 kPa(g)passrule: min 500 kPa(g)	320 deg Cpassrule: min 165 deg C	Hpassrule: tag -H; hot service 150 deg C
DN150-CAC-3002-1SS1-Nop 40 deg C · 300 kPa(g)	500 kPa(g)passrule: min 475 kPa(g)	50 deg Cconflictrule: min 55 deg CRegister carries op + 10; the BoD rule asks op + 15 deg C minimum. Looks like a legacy-rule entry.	Npassrule: tag -N; 40 deg C service
DN150-CAC-3003-1SS1-Cop 8 deg C · 280 kPa(g)	455 kPa(g)conflictrule: min 475 kPa(g)455 matches the formula before rounding; the round-up to the next 25 kPa is missing.	80 deg Cpassrule: min 23 deg C	Cpassrule: tag -C; cold service 8 deg C
DN80-CAC-3004-1SS1-Cop 8 deg C · 250 kPa(g)	425 kPa(g)passrule: min 425 kPa(g)	80 deg Cpassrule: min 23 deg C	Cpassrule: tag -C; cold service 8 deg C
DN80-H2-3005-1SS1-Cop 8 deg C · 250 kPa(g)	425 kPa(g)passrule: min 425 kPa(g)	80 deg Cpassrule: min 23 deg C	Cpassrule: tag -C; cold service 8 deg C
DN80-H2-3006-1SS1-Nop 10 deg C · 230 kPa(g)	425 kPa(g)passrule: min 425 kPa(g)	80 deg Cpassrule: min 25 deg C	Npassrule: tag -N; dry gas 10 deg C
DN50-FL-3007-1SS1-Nop 10 deg C · 230 kPa(g)	425 kPa(g)passrule: min 425 kPa(g)	200 deg Cpassrule: min 25 deg C	Npassrule: tag -N; intermittent flare service
DN25-SCW-3008-1SS1-ETop 30 deg C · 400 kPa(g)	440 kPa(g)conflictrule: min 575 kPa(g)Only the 1.10 x op branch was applied. At 400 kPa(g) operating, op + 175 kPa governs: 575 kPa(g).	80 deg Cpassrule: min 45 deg C	ETpassrule: tag -ET; traced make-up water
DN40-SCW-3009-1SS1-Cop 10 deg C · 230 kPa(g)	425 kPa(g)passrule: min 425 kPa(g)	80 deg Cpassrule: min 25 deg C	Cpassrule: tag -C; cold service 10 deg C
DN25-SCW-3010-1SS1-Nop 10 deg C · 400 kPa(g)	600 kPa(g)checkrule: pump discharge ruleP-301A/B discharge: the rule is shutoff head + max suction pressure. Needs the pump curve; the register value cannot be verified from the line list alone.	80 deg Cpassrule: min 25 deg C	Ncheckrule: tag -N; compare line 3009Sister scrub-water line 3009 carries C at the same 10 deg C. Confirm the cold-insulation cutoff for this service.
DN150-CWS-3011-1CS1-Nop 30 deg C · 400 kPa(g)	1000 kPa(g)passrule: min 575 kPa(g)	80 deg Cpassrule: min 45 deg C	Npassrule: tag -N; cooling water 30 deg C
DN150-CWR-3012-1CS1-Nop 40 deg C · 300 kPa(g)	1000 kPa(g)passrule: min 475 kPa(g)	80 deg Cpassrule: min 55 deg C	Npassrule: tag -N; cooling water 40 deg C
DN40-FL-3014-1SS1-Nop 40 deg C · 0 kPa(g)	500 kPa(g)checkrule: relief scenario governsRelief tail line: design conditions come from the API 521 scenario backpressure rather than the operating values. Confirm against the flare study.	200 deg Cpassrule: min 55 deg C	Npassrule: tag -N; intermittent flare service
DN80-CHS-3015-1CS1-Cop 0 deg C · 400 kPa(g)	600 kPa(g)passrule: min 575 kPa(g)	80 deg Cpassrule: min 15 deg C	Cpassrule: tag -C; brine 0 deg C
DN80-CHR-3016-1CS1-Cop 6 deg C · 300 kPa(g)	600 kPa(g)passrule: min 475 kPa(g)	80 deg Cpassrule: min 21 deg C	Nconflictrule: tag -C; brine 6 deg CRegister column says no insulation while the line number ends -C and the sister supply line 3015 carries C. The column looks stale.

Manual: 2-4 hours
With Plexus: 15-30 min review (estimate, one-sheet line register against three BoD rules)

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