GAS SERVICE ANIMATED

Clear 2D animated lessons for gas service work — a free supplementary study guide.

87 episodes released · The complete series + ten special seasons

▶ Watch on YouTube ↓ Get the Field Kit app

Study Tools

interactive

⤓ Field Kit — the installable app NEW

All the tools in one offline app for your phone. Open on a mobile browser → Add to Home Screen → works on the job with no signal.

Type a field question → the answer + the exact NFPA 54 section & episode.

404 questions with explanations & “Watch EP” links; mock, quick-20, by-topic.

Exam Simulator NEW

Timed mock exam (25/50/100/all) with pass–fail, a score breakdown by competency domain, and “study these episodes next.”

The whole bank as spaced-repetition cards that resurface what you miss.

Field Calculators

Pipe sizing, combustion air, meter clocking, pressure, vent sizing, combustion analysis & altitude. Each calculator now links to its Methods episode (EP 78–87).

Walk a call step by step: gas-odor response, no-heat, which vent table, combustion air.

En Español — Herramientas de Estudio

nuevo

Las mismas herramientas de estudio, en español para los técnicos de gas. (Los episodios tienen subtítulos en español.)

Examen de Práctica

404 preguntas con explicaciones y enlaces “Ver EP”.

Tarjetas de Estudio

271 tarjetas de repetición espaciada por tema.

Pregunta al Código

Escribe una pregunta y obtén la respuesta + la sección de NFPA 54.

Episodes

01 – 12

EP 01 ~4:40 How a Gas Pressure Regulator Works Street pressure in, a steady quarter-psi out — the spring-and-diaphragm balancing act, lock-up, creep, and why the vent must always breathe. Watch episode › EP 02 4:22 How the Gas Meter Measures Flow Inside the diaphragm meter — how alternating chambers turn moving gas into turning dials, and how to read the index like a pro. Watch episode › EP 03 4:42 Venting & Draft Why hot flue gas rises, how natural draft pulls a vent, and what spillage, blockage, and a proper termination look like in the field. Watch episode › EP 04 4:16 Combustion Air Where the fire gets its oxygen — the 50-cubic-foot rule, confined spaces, two-opening fixes, outdoor air, and the exhaust-fan competition. Watch episode › EP 05 4:25 Pipe Sizing — The Longest Length Method Total the loads, find the longest run, round UP, and size every section from one table row — the same worked house as the printable sheets. Watch episode › EP 06 4:34 Leak Investigation & the CGI The flammable window, reading percent of LEL, outside and inside investigation, and the protective actions that come before everything else. Watch episode › EP 07 4:30 Appliance Startup & Manifold Pressure Placing an appliance in operation — the leak check that never uses a flame, purging air, proving ignition, and dialing manifold pressure to spec on a manometer. Watch episode › EP 08 4:32 Type B Vents & Connectors Inside double-wall pipe — the air gap that keeps the skin cool, where Type B can and cannot go, connector rules, support, and a legal roof termination. Watch episode › EP 09 4:28 Sediment Traps, Drip Legs & Shutoffs The small parts that protect every appliance — the capped tee that catches debris while gas turns the corner, where traps are required, shutoff valve and connector rules, and the union that makes it all serviceable. Watch episode › EP 10 4:22 Pressure Testing & Purging Proving the system tight before gas flows — test pressure and hold time, isolating what cannot take the test, hunting a dropping needle, the operating-pressure leak check, and purging safely into and out of service. Watch episode › EP 11 4:04 CSST & Bonding Corrugated stainless steel tubing — EHD sizing tables, routing and strike protection, reading the jacket, and the single bonding clamp with its 6 AWG jumper that guards the thin wall against lightning energy. Watch episode › EP 12 4:16 Water Heaters — Gas Side The season capstone — the gas control valve, thermocouple pilot logic behind the classic outage call, FVIR chambers, reading the burner flame, clearances and location rules, and the T&P relief valve every tech verifies. Watch episode ›

Season 2

13 – 20

EP 13 4:20 Where Appliances Can and Cannot Live A furnace crammed into a bedroom closet can be more than bad practice — the forbidden rooms and why the code is strict, garage elevation and impact protection, working space, and the attic and roof access rules the tech verifies. Watch episode › EP 14 4:20 Furnaces & Boilers — The Gas Side How close can a furnace sit to something that can burn? Listed clearances and the protection-reduction table, the iron rule of return air, limit controls as the last line of defense, boiler safeties, plenums, and the failure gallery. Watch episode › EP 15 4:26 Vent Termination Rules A vent can do everything right inside the house and still fail at the last inch — re-entrainment, roof and chimney termination heights, the through-the-wall clearance map, the mechanical intake trap, and obstructions in the field. Watch episode › EP 16 4:24 Masonry Chimneys, Liners & Single-Wall Pipe Connect a modern gas appliance to a chimney built for a coal furnace and the flue is enormous for the job — weak draft, condensate attacking the masonry, the inspection before you connect, liners as the fix, exterior versus interior chimneys, and the single-wall pipe rules. Watch episode › EP 17 4:31 Common Venting Masterclass Two appliances, one chimney — each connector sized on its own, every shared segment carrying the combined load. Reading the two-appliance table, the interconnection tee, the seven-times rule, the orphaned water heater and how to fix it, and multistory common vents. Watch episode › EP 18 4:25 Condensing Appliances & Plastic Venting A condensing appliance refuses to send good heat up the flue — the secondary heat exchanger, Category IV on the map, plastic vent rules, what positive pressure changes, condensate handling under 12.10, mechanical draft under 12.4, and slope and support. Watch episode › EP 19 4:20 Know Your Pipe — Materials, Fittings & Joints The materials that carry the gas — and the ones that never can. Black steel, copper and the sulfur limit, listed CSST, and PE underground; the banned list, threads and joint compounds, brazing and soldering rules, fittings, and reading the markings on the pipe. Watch episode › EP 20 4:30 Kitchen & Laundry — Ranges and Dryers Thirty inches of clearance — and a dryer that needs to breathe. The thirty-inch rule over the cooktop, range installation, why gas dryers are Type 1, the moisture-exhaust duct rules, makeup air, lint as fuel, and the gas-side checks on every visit. Watch episode ›

Season 3

21 – 28

EP 21 4:10 Underground Gas — The Line You Cannot See The service line between the street and the meter — the line you cannot see. Twelve inches of cover, eighteen where damage is likely, what goes underground and what never does, the anodeless riser, corrosion and cathodic protection, calling 811 before any dig, and the signs of an underground leak. Watch episode › EP 22 4:22 Running Pipe Through a Building Every run hangs on its supports — six feet for half-inch steel, eight for three-quarter and one inch. Concealed piping rules, striker plates where pipe passes close to the surface, sleeved wall penetrations, chases and floors, slope and drips for wet gas, and the routes that are always off limits. Watch episode › EP 23 4:34 Fireplaces, Logs & Space Heaters The rogues’ gallery of comfort appliances. Gas logs in a real fireplace with the damper fixed open, screens and glass doors, vented gas fireplaces, floor furnaces and their register clearances, unvented room heaters and the oxygen depletion shutoff, wall furnaces, and the listing that rules them all. Watch episode › EP 24 4:15 Two-PSI Systems & Line Regulators Higher pressure, smaller pipe — and the second regulator inside. Why elevated pressure lets slim tubing feed big loads, the pressure limits indoors, the line regulator and its venting, overpressure protection downstream, sizing with two table families, where everything lives, and what the tech verifies on a two-psi job. Watch episode › EP 25 4:02 Overhead & Shop Heat Unit heaters, duct furnaces, and infrared — big-space heat from the ceiling. How radiant tubes warm objects instead of air, clearance in every direction around a glowing emitter, venting and combustion air for equipment mounted overhead, suspension and the gas connection, and the interlocks that tie air and fire together. Watch episode › EP 26 4:04 Food Service & Pool Heaters Forty-eight inches over the griddle — gas where grease and water live. Commercial kitchen clearances, exhaust hoods and their interlocks, quick-disconnects and restraint for movable equipment on casters, why grease is the enemy of every connection, pool heater venting and clearances, and winterization with the water-side interlocks. Watch episode › EP 27 4:08 How the Code Works Reading NFPA 54 like a tech — the point of delivery where responsibility begins, retroactivity and existing-and-safe versus modified-and-yours, mandatory language versus advisory annexes, listings and the AHJ, and how to navigate the book to an answer you can defend. Watch episode › EP 28 4:50 The Full Safety Inspection The series capstone. One house, one hour, every check from all twenty-seven prior episodes in a single Annex G walkthrough — meter set, piping, appliances, venting, the numbers pass, and documentation — ending with the whole code book animated on one wall. Watch episode ›

Carbon Monoxide — Special Series

29 – 34

EP 29 ~4:20 Carbon Monoxide: The Silent Killer It starts like the flu — headaches, nausea, worse indoors and better outside, but no fever. That missing fever is the tell: CO is the great imitator, misread as a virus for days while the house itself makes the family sick. Watch episode › EP 30 ~4:43 CO by the Numbers: Action Levels & the Two Scales Eighty-seven ppm as-measured is not eighty-seven air-free, and a flue-gas number is not a breathing-air number. Seven CO numbers on two different scales — exposure limits, field action levels, and the air-free math. Confuse them and someone gets hurt. Watch episode › EP 31 ~4:24 Four Meters, One Mistake: The CGI Is Not a CO Meter A furnace is suspected of making CO, so the tech waves a combustible-gas indicator near the flue. Freeze the frame — wrong tool. The CGI hunts gas leaks and is deaf to the gas that kills. Line up all four meters and get it right. Watch episode › EP 32 ~5:16 Chasing the Source: Finding CO Appliance-by-Appliance The alarm is screaming, the family is outside, and at the door the air reads clean. That changes nothing. Zero in fresh air, survey room to room, work the suspect gallery, isolate one appliance at a time, and confirm it at the flue. Watch episode › EP 33 ~4:24 Worst-Case: Depressurization & Backdraft Testing On the bench the water heater drafts perfectly; in the home it spills. Run the dryer, range hood, bath fans, and furnace blower together and the house goes negative — the weakest vent reverses and exhaust rolls back into the room. Build the worst case on purpose, then measure it. Watch episode › EP 34 ~4:19 The Alarm Went Off: CO Response & Red-Tag When a CO alarm sounds, people come first — get everyone to fresh air, and at seventy ppm or anyone sick, call 911 and diagnose after. Treat every alarm as real: confirm the source, make the shutdown call, red-tag and lock out, document, and never re-energize. Watch episode ›

Gas Leaks — Special Series

35 – 40

EP 35 ~5:14 The Explosive Range Natural gas burns between about five and fifteen percent in air and propane between roughly two and nine and a half, with the middle of the band the most violent — and because one gas rises while the other sinks, where you sweep depends on which you're chasing, while your nose is never a substitute for a meter. Watch episode › EP 36 ~5:14 Three Scales & the Meters One atmosphere reads three ways — parts per million to pinpoint a trace, percent of the lower explosive limit to judge explosion risk, and percent by volume when the gas is thick — all anchored on five percent gas equalling one hundred percent LEL equalling fifty thousand ppm, read by the right instrument and never a combustible-gas indicator mistaken for a CO tool. Watch episode › EP 37 ~5:26 Finding the Leak: The Survey A leak call is a method, not a sniff — approved tools only and never a flame, prove tightness because a pressure drop is a leak until proven otherwise, work the system in order from the meter set to every appliance connector, then let two rules decide: within five feet of a wall you go inside, and a reading inside means get people out. Watch episode › EP 38 ~5:14 Grading the Leak: 1 · 2 · 3 Distribution grades every leak by hazard — Grade one is an existing or probable hazard you act on now and never leave, Grade two is scheduled repair, Grade three is monitored — and the classifying grade is the gas plus its distance from a structure and the surface capping it, not just the number on the meter. Watch episode › EP 39 ~5:32 Migration & Bar-Holing Underground gas rarely surfaces over the pipe — it travels far and often uphill, and frost, pavement, and saturated ground cap the surface and drive it sideways into foundations — so you bar-hole at equal pipe depth, tighten the pattern to the sustained peak, and bar out to zero to draw the true edges of the plume. Watch episode › EP 40 ~5:20 Making Safe & Response When a leak is a hazard the survey becomes a rescue — evacuate and keep back, kill every ignition source including the switch in your hand, ventilate and monitor below ten percent LEL, shut off at the appliance, meter, or curb, call for help early, red-tag what's unsafe, and re-enter only when it's clear, tight, and proven. Watch episode ›

Combustion Analysis — Special Series

41 – 42

EP 41~5:22 The Four Readings The CO season taught you to detect a bad burn; this one teaches you to measure it — oxygen for excess air, carbon monoxide corrected air-free for safety, carbon dioxide for the tightness of the burn, and net stack temperature for the heat you lost, all read from an undiluted sample at steady state. Watch episode › EP 42~5:28 Efficiency & Tuning Turn the four readings into a number — steady-state efficiency from net stack temperature and carbon dioxide — then work the tension every tune lives in: cut excess air to gain efficiency, but stop the moment carbon monoxide starts to climb, aiming at the manufacturer's targets in small, verified steps. Watch episode ›

No Gas — Special Series

43 – 48

EP 43 ~5:18 The No-Gas Ladder Every loss-of-gas call splits at one question — whole house or one appliance — then two measurements do the sorting, whether the meter registers on a known load and where the pressure dies, so you climb the ladder from appliance to branch to meter to street eliminating one rung at a time, and after any interruption you purge, leak-check, and relight before anything goes back in service. Watch episode › EP 44 ~5:20 The Meter The diaphragm meter is a gas-driven pump measuring fixed volumes, so it usually fails by mis-counting rather than by stopping gas — a true no-gas meter means the valve is off or locked, moisture inside has frozen, or something has seized hard — and you prove it by clocking the test dial against a known load and reading inlet versus outlet pressure, then hand the utility's meter back to the utility. Watch episode › EP 45 ~5:18 The Regulator The number-one reason for a live meter with no gas downstream is the regulator — debris on the seat, a vent plugged by mud daubers, paint, or ice that leaves it deaf, a Joule-Thomson freeze on a cold high-demand morning, or a fatigued diaphragm all read as inlet-yes, outlet-no — so check the vent first, and leave the swap to the utility whose regulator it is. Watch episode › EP 46 ~5:44 Safety Shutoffs & Excess-Flow Valves Some no-gas calls are a safety device doing its job — a slam-shut latches closed on an overpressure spike and takes a manual reset only after you find the cause, a service excess-flow valve trips on a surge and reopens by isolating the load unless a repeat trip says find the leak, and a connector's own excess-flow or thermal element, or a directional device piped in backward against its arrow, can kill a single appliance with nothing wrong upstream. Watch episode › EP 47 ~5:18 Water & Freeze-Ups Water gets into gas lines through leaks, flooded mains, and un-dried new pipe, pools in the low spots and drips to throttle the flow, and in the cold freezes solid — icing regulator vents, blocking meters, and heaving frozen ground into buried joints — so you blow the low point down to dry gas with proper purging and ignition control, then find where the water is coming from before the next cold snap brings it back. Watch episode › EP 48 ~5:20 The Appliance Won't Fire When gas is there but the appliance won't light, follow the sequence — call, ignite, prove flame — past the broken-stem valve that says open while the ball stays shut, the thermocouple whose tiny millivolt signal is all that holds a standing pilot's valve open, the voltage test that settles an electronic gas valve, and the chain of safeties built to cut the gas by design, then place it back in operation and prove it safe before you leave. Watch episode ›

LP-Gas — Special Series

49 – 54

EP 49 ~5:10 Propane Fundamentals Propane is its own vaporizer — liquid boiling at −44 °F under a vapor pressure that tracks temperature, not tank level — and its vapor is 1.52 times heavier than air so leaks pool low, expands about 270-to-1 from liquid, carries roughly 2,500 Btu per cubic foot, and rides on an odorant whose fade on new or rusty steel means the instrument, never your nose, gets the final word. Watch episode › EP 50 ~4:50 Tanks & Cylinders Stationary ASME tanks and portable DOT cylinders live under NFPA 58's rules — filled to 80 percent so the vapor space can absorb expansion and proven by the fixed liquid level gauge rather than the float, protected by a relief valve and the separation-distance tables, cylinders stored upright and never indoors, and the tank regulator's vent pointed down and sheltered under the dome. Watch episode › EP 51 ~4:46 Two-Stage Regulation Tank pressure swings from near zero to about 200 psig with the weather — far too wild for one cut — so a first stage at the tank takes it to roughly 10 psig and a second stage at the building drops it to 11 inches of water column, sized in Btu per hour and fighting the same enemies as any regulator: debris, blocked or iced vents, fatigued diaphragms, and freeze-ups. Watch episode › EP 52 ~4:48 Vaporization & Cold Weather The tank's wetted surface is its boiler plate, so vaporization capacity rides on tank size, liquid level, and outdoor temperature — cold weather plus a low level collapses capacity even with gas in the tank, frost or sweat on the shell is the overdraw tell as the boiling liquid chills itself, and the fix is sizing to the connected Btu load and keeping winter levels up. Watch episode › EP 53 ~4:58 The NG↔LP Conversion LP carries about 2.5 times the Btu per cubic foot and runs at roughly triple the manifold pressure, so the orifice must get much smaller — the manufacturer's conversion kit only, never drilled orifices or guessed springs — then set manifold pressure to the nameplate for the new fuel, adjust primary air, prove it with a combustion check, and apply the conversion label. Watch episode › EP 54 ~4:50 LP Safety & the Boundary LP leaks pool and persist in low spots — so you sweep low, ventilate low, and remember a too-rich pocket passes back through the flammable range as it clears — every out-of-gas event or interruption demands a leak check and qualified relight before appliances return to service, and the legal line matters: NFPA 58 owns the container to the point of delivery, NFPA 54 everything downstream. Watch episode ›

Electrical & Ignition — Special Series

55 – 59

EP 55 ~5:00 Millivolt Systems A thermocouple makes about 30 millivolts open-circuit and 12–15 under load while a thermopile runs the whole valve on 750-millivolt power with no outside electricity — so the loaded-versus-unloaded readings, the 30-second holding test, and the timed drop-out click of the pilotstat magnet tell you whether the pilot's tiny generator or the valve it feeds is the failure. Watch episode › EP 56 ~4:54 The 24-Volt Circuit A 40-VA transformer feeds the low-voltage side where the thermostat's call must pass a series safety chain — door switch, high limit, rollouts, pressure switch — any open kills the call, and the fastest diagnosis in the trade is measuring across each switch with the call active: zero volts across a closed one, the full 24 across the open. Watch episode › EP 57 ~5:00 Flame Rectification The control puts an AC signal on the flame rod and the flame itself rectifies it to pulsing DC — healthy commonly 1–10 microamps, dropout under about half a microamp measured in series — so silica glaze on the rod, a poor burner ground, cracked ceramic, reversed line polarity, or a flame that doesn't envelop the rod all read as “no flame” to a board that is really watching ion flow. Watch episode › EP 58 ~5:16 The Four Ignition Systems Standing pilot, intermittent pilot, direct spark, and hot surface all run the same logic — prepurge, ignite, prove flame within the trial for ignition, retry, then soft or hard lockout — with fragile silicon carbide versus rugged silicon nitride igniters, and a fault LED that names the failing subsystem rather than the part. Watch episode › EP 59 ~4:50 The Multimeter Four measurements run the trade — AC volts for the 24- and 120-volt sides, DC millivolts for thermocouples and thermopiles, ohms only with power off and the component isolated, and DC microamps in series for flame current — with voltage-across-the-switch beating continuity-pulling-wires, never ohms on a live circuit, and CAT ratings respected. Watch episode ›

Modern Appliances — Special Series

60 – 62

EP 60 ~5:16 Tankless Water Heaters A 199,000 Btu/hr tankless draws about five times the gas of the tank heater it replaces, making the swap a gas-load change that re-runs the whole system's longest-length sizing — then know the minimum activation flow that leaves a dribbling faucet cold by design, the manometer-at-full-fire test that catches dynamic pressure collapse, and the Category III versus IV vent rules with their acidic condensate. Watch episode › EP 61 ~5:04 Mod-Con Boilers & Combis A condensing boiler only earns its 90-plus percent efficiency when return water stays below the roughly 130 °F flue dew point — so outdoor reset keeps returns cool, primary/secondary piping protects the heat exchanger's minimum flow, the combi's plate exchanger scales in hard water until showers fluctuate, and the acidic condensate gets neutralized while a blocked trap means lockout. Watch episode › EP 62 ~5:00 Reading the Flame A healthy flame is soft blue with a defined lighter-blue inner cone seated on the port — yellow tipping means starved primary air, lifting means the mixture outruns flame speed, flashback burns back at the orifice, and impingement on cold metal quenches into CO and soot — but some dangerous burners burn blue, so tune to stable blue and then let the analyzer prove it. Watch episode ›

History — Special

63

EP 63 ~5:04 Why Gas Smells: New London, 1937 On March 18, 1937, odorless untreated gas leaking from a faulty connection pooled in the crawlspace under the London School in New London, Texas, and a shop-class switch ignited it — nearly 300 students and teachers died in the deadliest school disaster in U.S. history — and within weeks Texas mandated gas odorization, the rule that became the federal one-fifth-of-LEL requirement and the reason gas smells at all. Watch episode ›

Commercial Gas — Special Series

64 – 68

EP 64 ~5:10 The Commercial Gas Train Between the meter and the burner the gas line becomes a train — strainer, shutoff, regulator, low-pressure switch, two safety shutoff valves in series with a bleed between, high-pressure switch, and the firing-rate valve — and reading that order, respecting proof-of-closure and manual-reset lockouts, and never jumpering an interlock is how you know exactly where your part of the work ends. Watch episode › EP 65 ~4:42 Rooftop Units A packaged rooftop unit is mostly a furnace you already understand bolted into the weather, so the method doesn’t change at altitude — but wind makes nuisance pressure-switch trips, dust glazes flame sensors, vibration cracks igniters, winter freezes condensate traps, and the code’s roof-access rules decide whether you can even reach the answer safely. Watch episode › EP 66 ~4:42 Commercial Kitchens A commercial kitchen runs a manifold of appliances on casters through listed connectors with quick-disconnects and restraint cables, all under a hood whose fire-suppression system holds a gas valve on the whole cook line — discharge kills the line until a qualified reset — so one dead appliance is local, a dead line is the interlock, and grease hides everything until you inspect by hand. Watch episode › EP 67 ~4:36 Big Venting & Boiler Rooms Commercial venting is the same physics scaled to the edge of the Chapter 13 tables — then it becomes an engineered design you read but never improvise — while the boiler room itself must prove its motorized louvers open, prove its draft real with barometric dampers and proving switches, and honor the boiler code’s low-water cutoffs, manual-reset limits, and gas-train rules before any burner fires. Watch episode › EP 68 ~4:28 Commercial Metering & Elevated Pressure Big buildings meter through rotary and turbine meters behind strainers and bypass piping, take delivery at pounds staged down through regulators whose vents are sacred, and demand bollards, seismic bracing, and meter identification tags — so your work is dynamic pressure proof under load, tag reading, and documentation, with the utility boundary holding firm at the meter outlet. Watch episode ›

The Service Call — Special Series

69 – 72

EP 69 ~4:52 The Service Call: No Heat An eighteen-degree no-heat morning becomes a masterclass in the method — split the house from the appliance at the door, listen for where the ignition sequence dies, chain-walk the safeties until twenty-four volts marks the break at a pressure switch held open by a fluff-packed intake — then prove the why, prove the burn with the analyzer, and write it all down. Watch episode › EP 70 ~4:54 The Service Call: Gas Odor An intermittent kitchen gas odor runs on the leak season’s rules from the phone call onward — zero the instrument outside, question before entering, sweep and survey down to a range manifold nut that only leaks when the oven cycles — then make safe in order, repair, re-test under load, educate the customer, and never forget the branch where the call flips to evacuation. Watch episode › EP 71 ~4:46 The Service Call: Water-Heater Swap A “simple” forty-gallon water-heater swap is really five systems — gas, vent, air, water, and proof — so you survey the shared masonry chimney against the common-vent tables and the orphan scenario, fit a new listed connector, bubble-test every joint you touched, confirm combustion air, prove draft at worst case for five minutes, and respect the T&P before signing off. Watch episode › EP 72 ~4:50 The Service Call: New-Install Walkthrough Testing, connecting, and lighting another contractor’s new fireplace-and-dryer piping means your name goes on its future — so eyes first for materials, bonding, and supports, then the Chapter 8 pressure test held flat, a disciplined outlet-by-outlet purge, every appliance proven under its own safeties, combustion air re-run for the rooms that exist now, and documentation the next tech can read like a birth certificate. Watch episode ›

Worked Problems — Special Series

73 – 75

EP 73 ~4:40 Workshop: Pipe Sizing Two chalkboard problems on the verified Schedule-40 table put the longest-length method through a real ranch house — 220,000 Btu at fifty-eight feet rounds to the sixty-foot row and lands the trunk on one-inch pipe with every branch read from that same row — and then a tankless upgrade pushes the total to 379,000 and proves why one appliance swap re-sizes the artery to inch-and-a-quarter. Watch episode › EP 74 ~4:36 Workshop: Vent Sizing Three worked vent problems on the verified Chapter 13 tables teach the grammar that settles arguments — a fan-assisted furnace must land inside the FAN min-to-max window rather than just under a ceiling, a single-wall connector moves you to the lower-capacity table, and a ninety-square-inch masonry flue fails the seven-times rule and earns a listed liner. Watch episode › EP 75 ~4:44 Workshop: Combustion Numbers Two furnaces go from four analyzer readings to a verdict entirely by pencil — excess air and carbon dioxide computed from oxygen, carbon monoxide corrected to air-free before any judgment, stack-loss efficiency from the fuel’s own constants — first a healthy natural-gas tune, then a fresh propane conversion whose rising CO trend earns an air-shutter nudge and a re-read. Watch episode ›

Frontier — Special Series

76 – 77

EP 76 ~4:54 Standby Generators The standby generator is the biggest gas appliance nobody sizes for — over 300 cubic feet an hour at full load — so the pipe is sized at full load over the longest length, the meter must prove it can carry the house plus the machine, fuel pressure is measured dynamic through crank and transfer, and the five-foot rule, the derates, and the engine exhaust keep the CO season in full force. Watch episode › EP 77 ~4:48 The Future of Gas: Hydrogen & RNG Renewable natural gas is the same pipeline-spec fuel from a new source — nothing changes at the burner — while hydrogen blends capped near twenty percent mostly ride today’s equipment with faster flame speed, about a third the Btu per cubic foot, nearly invisible flames, and a smaller molecule that finds leaks sooner, which is why the method you already own is exactly what carries you through the fuel transition. Watch episode ›

Methods — Special Series

78 – 87

EP 78 ~4:56 The Longest Length Method Sum the loads, tape to the most remote outlet, round the length up, and let one row of Table 6.2.1(b) size every section for what it feeds — then count the fittings and re-check the minimum inlet pressure at every appliance. Watch episode › EP 79 ~4:56 Branch Length & the Other Sizing Methods Size the longest run first, then re-enter the table at each branch’s own shorter length for legally smaller pipe — with the hybrid two-psi trunk, the corrugated-tubing tables read by EHD, and the re-size-before-you-connect rule for existing systems all under one floor: minimum inlet pressure everywhere. Watch episode › EP 80 ~4:56 Combustion Air: The Standard Method Fifty cubic feet of room per thousand Btu decides confined or not; short means two permanent openings high and low — sized one square inch per thousand indoors, per four thousand direct or vertical, per two thousand horizontal — with louver derates, the three-inch minimum, and the disqualifiers hunted before sign-off. Watch episode › EP 81 ~4:50 Combustion Air: The Advanced Methods When the standard method fails: one high opening at input over three thousand, the tight-house infiltration equations mandatory below 0.4 air changes, a mechanical fan at 0.35 cfm per thousand interlocked to the burner, and the combination method that scales the openings by the room’s partial credit. Watch episode › EP 82 ~4:44 Clocking the Meter Turn the meter’s test dial into a flow instrument — 3600 times the dial size over the seconds per revolution, three revolutions averaged, times the real district heating value — to prove appliance input against the nameplate, with pilots and elevated meter pressure the two traps that skew it. Watch episode › EP 83 ~4:52 Pressure: Reading, Converting, Testing Zero the manometer, then read static and dynamic pressure under full fire to find where the sag lives, convert across psi, inches of water, and ounces at 27.7 to the psi, and prove new pipe tight at three psi minimum with a right-sized gauge before it ever carries gas. Watch episode › EP 84 ~4:56 Reading the Vent Tables: 13.1(a) Feed total height and lateral into Table 13.1(a) — the NAT max column for a draft-hood appliance, the FAN min-max window for fan-assisted — where N/A means not allowed, interpolation is permitted and extrapolation never, and extra elbows and the seven-times area cap finish the job. Watch episode › EP 85 ~4:54 Single-Wall, Common Vents & Masonry Single-wall connectors carry slightly less and demand far more input to draft, common venting is three lookups — two connectors and the combined load on one vent — and a masonry flue over seven times the appliance outlet gets a listed liner sized from the Type B tables at eighty percent. Watch episode › EP 86 ~4:38 Combustion Numbers, Step by Step Correct the CO to air-free at 20.9 over 20.9 minus oxygen, read excess air and CO2 from the same oxygen, estimate stack-loss efficiency, and tune to the CO breakpoint — the four numbers your analyzer runs in half a second, walked once by hand so you trust it for the right reasons. Watch episode › EP 87 ~4:42 Altitude & the 4% Rule Above two thousand feet a fixed orifice meters volume, not molecules, so derate four percent per thousand counted from sea level — or defer to the manufacturer — step orifices down by the annex table, and verify by clocking against the derated target with the local heating value, proven by air-free CO. Watch episode ›

Series Complete

28 / 28

Every Chapter, Covered

28 episodes covering every high-relevance chapter of NFPA 54 (2024) — from the pressure regulator to the full safety inspection. Pair any episode with its Gas Service Master Atlas study sheets in this same folder for the printable drill.

Companion Materials

Gas Service Master Atlas — PDF Study Sheets

Each episode pairs with the printable Gas Service Master Atlas study sheets stored in this same folder — venting fundamentals, Type B vents and connectors, combustion air, Chapter 13 sizing sets, and appliance startup. Look for files named Gas_Service_Master_Atlas_….pdf alongside the episodes.

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Study companion — not a code substitute. Episodes use typical natural-gas training values (27.7 in. w.c. per 1 psi; ~7 in. w.c. delivery; ~3.5 in. w.c. appliance manifold). Always use the exact NFPA 54 (2024) tables and text, manufacturer instructions, AHJ requirements, and your company's current procedures.