NM Journeyman Plumber study plan

Define and correctly apply the core DWV vocabulary (soil stack, waste stack, vent stack, stack vent, branch interval, fixture branch, fixture drain, developed length) without notes

Trace a full drainage path from fixture drain through trap, branch, stack, and building drain and label every fitting on a hand-drawn isometric

Distinguish wet venting, common venting, circuit venting, and individual venting and state one code condition that governs each

Compute developed length of a vent run and apply the correct trap arm distance and vent size rule for a given fixture

Size a building drain, building sewer, and horizontal branch using fixture units and the correct slope-to-capacity table

Select the correct trap type and size for a lavatory, water closet, floor drain, and clothes washer standpipe

Explain the venting and trap requirements for an indirect waste receptor and an air gap

Identify when a grease interceptor, sand interceptor, or acid-neutralizing trap is required and size one from given fixture data

Calculate total fixture units for a mixed-occupancy branch and verify the pipe size against slope

Determine minimum fixture supply pipe sizes from fixture units and convert between pressure, head, and elevation using the correct formulas

Calculate pressure loss from friction and elevation across a supply run and determine whether residual pressure at the top fixture is adequate

Size a water service and meter for a single-family dwelling given fixture count, developed length, and available street pressure

Explain the purpose and location of a pressure-reducing valve, thermal expansion tank, and backflow preventer in a distribution system

Compare PEX, copper, CPVC, and galvanized distribution and state one code-relevant limitation of each

State the required fixture clearances, water closet compartment dimensions, and lavatory spacing for a residential bathroom

Identify the required flow rate, temperature limits, and backflow protection for shower valves, tub fillers, and hand sinks

Explain fixture fitting requirements for air gaps, vacuum breakers, and antisiphon devices on hose bibbs and flush valves

Verify a kitchen and bath layout against minimum fixture spacing and accessibility clearances

Distinguish fixture unit values for the common fixtures and apply them to a supply branch

Size a gas line for a range, water heater, and furnace using the longest-length method and the correct capacity table

Calculate the required combustion air for a gas-fired appliance room using the indoor and outdoor air methods

Identify the required clearances, venting category, and relief valve requirements for a tank and a tankless water heater

Explain sediment trap, shutoff valve, union, and connector requirements for gas appliances

Determine T&P relief valve discharge piping requirements and thermal expansion control for a closed system

Size a storm drainage system from roof area and rainfall intensity and select conductor, leader, and gutter sizes

Explain subsoil drainage, footing drain, and sump pit requirements and when a backwater valve is required

Identify ventilation requirements for plumbing fixtures and the minimum vent terminal height and location rules

State the safety requirements for confined spaces, trenching and shoring, and combustion air openings on a job site

Explain the difference between a trap primer, a backwater valve, and a cleanout and where each is required

Describe the permit, plan review, rough-in inspection, and final inspection sequence for a residential project

List the items an inspector commonly checks at rough-in and at final and state the code basis for each

Explain the adoption and amendment structure of the New Mexico plumbing code and where local amendments may apply

Identify licensing, bonding, and continuing education obligations for a New Mexico journeyman plumber

Apply general definitions and prohibited practices to five scenario questions and justify each answer

Complete two full-length timed practice exams under exam conditions and score each by domain

Re-study the two lowest-scoring domains using targeted drills rather than full rereads

Recompute the ten most error-prone calculations (fixture units, gas sizing, storm drainage, pressure loss) until each is correct twice in a row

Build a one-page formula and table sheet for exam-day reference from memory

Review every missed question and write the reason for the correct answer in one sentence