12.2 Cut Sheets, Hydraulic Summaries & Approval Workflow

12.2 Cut Sheets, Hydraulic Summaries & Approval Workflow

Quick Answer: Cut sheets must show the listed SIN, K-factor, temperature, and finish that the working-plan legend draws. Extra-stock heads use those same SINs. A Level I trainee reads the hydraulic summary — remote area, density, area, hose, elevation, residual at the base of the riser versus the supply curve — and will not send a package whose demand sits above the available supply. Shop drawings go through supervisor QC, then engineer/owner/AHJ review, comments, clouded revisions, and an approved-for-construction stamp. Do not fabricate from an unapproved set.

Task 1.6.1 does not end when the floor plan looks busy. The AHJ and the engineer of record review a package: working plans, product data, hydraulic calculations, and a transmittal. Level I assembles that package. Level II and III still own the hard hydraulics and the designer identification on many jobs; your job is to catch mismatches a reviewer will bounce in twenty minutes.

Cut sheets are listed data, not catalog wallpaper

Cut sheets (product data, specification sheets) are the manufacturer's listed pages for the devices on the drawings. A submittal that includes a 40-page sprinkler catalog with no highlight is not product data. Mark the exact model. Shop-submission rules that implement NFPA 13 working-plan practice, including George Mason University's water-based guidelines, require equipment on the design to be clearly identifiable on the specification sheets by highlight or marking. That is the trainee habit: mark the SIN that appears in the legend.

Match, line by line, to the working-plan sprinkler schedule:

• Sprinkler Identification Number (SIN)
• Nominal K-factor
• Temperature rating and bulb/color if shown
• Finish and escutcheon (brass, chrome, white, recessed)
• Orientation and listing (upright, pendent, sidewall, dry pendent, concealed)
• Listing laboratory and any response type (standard, quick-response, residential, ESFR)

Wrong K-factor or finish on the cut sheet versus the plan is a reject. A pendent listed K-5.6 on the drawing with a cut sheet for a K-8.0 "because we had that PDF open" is not a close-enough head. The hydraulic calculation used a K. The extra-stock cabinet will be stocked to a SIN. The inspector will read the head. Those three must tell the same story.

Worked reject: legend shows Manufacturer A, SIN XXX, K-5.6, 155°F, chrome pendent, 142 heads. The cut sheet in the binder is Manufacturer A, SIN XXX, K-5.6, 155°F, brass. The SINs match; the finish does not. The owner bought chrome for a finished office. Send it back. Do not note it later on a field ticket.

Valves, hangers, flexible drops, and the FDC get the same treatment. If the plan calls a listed flexible drop, the cut sheet must show the model, listed length, and bend limits. MeyerFire notes that 2022 28.1.3(17b) put flexible-drop K-factor, length, manufacturer, maximum bends, minimum bend radius, and model on the working plans when flex is used. A flex cut sheet that does not support those notes is incomplete product data.

Extra-stock heads match the installed SIN

NFPA 13 (2022) 16.2.7 is Stock of Spare Sprinklers. Secondary summaries of that section still require a stock that corresponds to the types and temperature ratings installed, a wrench for each type, a list in the cabinet, and a cabinet location that will not overheat the heads. Confirm the current quantity steps in 16.2.7 on exam day rather than memorizing a blog.

The Level I assembly check is stricter than "we ordered some pendents." Extra-stock heads match the SINs on the working plans and the cut sheets. A chrome K-5.6 quick-response pendent in a finished ceiling is not replaced by a brass upright from leftover stock even if both are 155°F. Dry pendents, concealed plates, and extended-coverage heads are the usual misses: the cabinet looks full, and none of it fits the head that broke.

If the working plans show three SINs, the product-data stack and the extra-stock list show three SINs. A fourth mystery head in the extra-stock submittal is clutter. A missing SIN is a deficiency. Extra stock is part of the package the AHJ is approving, not a closeout afterthought the warehouse will "figure out."

How a Level I trainee reads a hydraulic summary

You do not rebuild the calc. You read it the way a plan reviewer reads the first two pages. Chapter 28 houses hydraulic calculation procedures and the form-sheet practice NFPA 13 has used for years: a summary sheet, detailed worksheets (or computer printout), and a graph sheet. University and AHJ shop-submission guides that cite NFPA 13 still expect those pieces plus water-supply information taken all the way back to the test hydrant or other source.

On the summary, confirm these fields exist and agree with the drawings:

If demand exceeds supply, the package is not ready. The graph sheet plots the water-supply curve and the system demand (sprinklers plus hose). The demand point at the base of the riser must sit on or below the available curve. When it sits above, you do not submit anyway and let the AHJ decide. You return the set to the person who ran the calc. Pipe sizes, K-factors, the remote-area location, or the water supply itself has to change first.

Worked read: summary says ordinary-hazard Group 1, density 0.15 gpm/ft², area 1,500 ft², hose 250 gpm, most remote area at the far loading dock, residual demand 480 gpm at 64 psi at the base of the riser. Flow-test note on the plan: 72 psi static, 48 psi residual at 1,050 gpm, test hydrant at the same elevation as the riser, test date last month. Sketch the curve. At 480 gpm the available residual is only about 58 psi. Demand 64 psi is above the supply. Stop. This is not a cut-sheet problem and not a hatching problem. The hydraulics do not work.

Elevation is the trainee trap on that same graph. If the remote area is 28 ft above the base of the riser, that elevation head (0.433 psi/ft in the usual conversion) is already inside a correct BOR demand. If someone compared remote-head pressure to the city-main residual without bringing the demand back to the riser, the graph is lying. Level I does not rerun Hazen-Williams. Level I does refuse to assemble a package whose own graph shows a miss.

Hose demand belongs on both the summary and the working-plan hydraulic placard. Dropping hose off the graph until the curve "clears" is not a Level I correction; it is a false package. If hose was required for the occupancy, it stays in the total until a qualified designer changes the design approach.

Approval workflow

The package does not go from your CAD session to a pipe truck. It follows a review loop the contract and the AHJ both expect.

Walk that loop as a trainee, not as a project manager:

1. Shop drawings — working plans, cut sheets, hydraulic summary, owner's certificate, transmittal.
2. Supervisor QC — completeness against Chapter 28 categories, SIN matches, demand versus supply.
3. Submit to the engineer of record, the owner, and the AHJ as the contract names them.
4. Comments — written review notes, not hallway conversation.
5. Revise — change the model, recalc if K or pipe changed, cloud the drawing changes, update the revision table.
6. Approved for construction — stamps, signatures, dates.

Stamps are the legal release. An AHJ approved stamp, an engineer-of-record review stamp, and the contractor's or designer's identification are not interchangeable. NICET policy and many state rules also forbid a NICET technician from using a seal that looks like a PE stamp. Level I does not invent a stamp. George Mason's shop-submission rules, which cite NICET Policy 28, are a useful field reminder: a NICET designer identifies certification number, type, level, and expiration, and does not apply a PE-lookalike seal.

Clouded revisions mark what changed after the last issue. A reviewer should not have to hunt through 24 sheets to find the new occupancy hatch in Room 112. Cloud it, put a revision triangle on it, and log it in the title-block revision table. A complete system redesign may be issued as a new set without clouds; a punch-list of comments is not a complete redesign. Do not erase clouds from an old issue and pretend it is the approved set.

Do not fabricate from an unapproved set. Burning 2-inch pipe, ordering 142 chrome pendents, or tapping the city main from a plot still in review is how shops pay for a K-factor change the AHJ required. If the contract says no installation before approval, that includes fabrication that cannot be returned. Underground lead-ins and extra-stock cabinets are not exceptions.

Transmittal and the comment cycle

The transmittal is the cover letter the owner and AHJ file. It lists project name and address, what is attached (sheet numbers and dates, hydraulic calc dated, cut-sheet list, owner's certificate), who sent it, and what action you are requesting (review and approval, resubmittal of sheets FP-3 and FP-4 only, and so on). If you cannot point to the transmittal, you cannot prove what was submitted.

Worked comment cycle: AHJ comment 1 — Room 112 has no occupancy hatch. Comment 2 — cut sheet K-8.0 versus plan K-5.6. Comment 3 — demand exceeds supply at the BOR. You hatch Room 112, replace the cut sheet and the legend SIN, send the calcs back to the designer who changes pipe, you cloud the pipe sizes and the remote-area outline, you restaple a transmittal that says resubmittal of comments 1–3, and you wait for the stamp. You do not tell the shop to use the old pipe list except for the 2-inch. After approval, the field builds the stamped set. As-built differences later belong in closeout, not in a silent field change to an unapproved drawing.

Local AHJs add their own filters on top of Chapter 28 — recent flow tests, electronic PDF only, a safety factor under the supply curve, PE stamps on every sheet. Those are contract and AHJ rules, not a reason to skip NFPA 13 content. Assemble the Chapter 28 package first, then add what the transmittal and the specification demand. That is Level I submittal work: match the paper, read the graph, run the loop, and keep unapproved ink off the jobsite.