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Plumber

Residential plumber at work.
Occupation
Occupation type	Vocational
Activity sectors	Construction
Description
Education required	Industrial Training Institute (ITI), Apprenticeship
Related jobs	Carpenter, electrician

A plumber is a tradesperson who specializes in installing and maintaining systems used for potable (drinking) water, hot-water production, sewage and drainage in plumbing systems.^[1][2]

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The origin of the word "plumber" dates from the Roman Empire.^[3][4] Roman roofs used lead in conduits and drain pipes^[5] and some were also covered with lead; lead was also used for piping and for making baths.^[6] The Latin for lead is plumbum. In medieval times, anyone who worked with lead was referred to as a plumber; this can be seen from an extract about workmen fixing a roof in Westminster Palace; they were referred to as plumbers: "To Gilbert de Westminster, plumber, working about the roof of the pantry of the little hall, covering it with lead, and about various defects in the roof of the little hall".^[7]

Years of training and/or experience are needed to become a skilled plumber; some jurisdictions also require that plumbers be licensed.

Common plumbing tasks and skills include:

• Reading drawings and specifications, to determine the layout of water supply, waste, and venting systems
• Detecting faults in plumbing appliances and systems, and correctly diagnosing their causes
• Installing, repairing and maintaining domestic, commercial, and industrial plumbing fixtures and systems
• Locating and marking positions for pipe connections, passage holes, and fixtures in walls and floors
• Measuring, cutting, bending, and threading pipes using hand and power tools or machines
• Joining pipes and fittings together using soldering techniques, compression fittings, threaded fittings, solvent weld, crimp and push-fit fittings.
• Testing pipes for leaks using air or water pressure gauges
• Paying attention, in all work undertaken, to legal regulations and safety issues
• Ensuring that all safety standards and building regulations are met.

Plumbing work is defined in the Australian Standards (AS3500) Regulations 2013 and refers to any operation, work or process in connection with installation, removal, demolition, replacement, alteration, maintenance or repair to the system of pipes and fixtures that conveys clean water into and liquid waste out of a building.

To become a licensed plumber a four-year apprenticeship and a Certificate III in Plumbing is required. As part of this course, instruction in the basics of gas fitting will be undertaken. Upon completion, these basics in gas fitting will allow the plumber to not only apply for their plumbing license but also an interim gas license, and carry out gas work under the supervision of a fully qualified gas fitter.

To obtain a full gas license from the Department of Mines and Energy, the plumber will need to have worked on an interim gas license for a minimum period of twelve months and successfully completed a Certificate IV in Plumbing.

In Canada, licensing requirements differ by province; however, the provinces have pooled resources to develop an Interprovincial Program Guide that developed and now maintains apprenticeship training standards across all provinces. The Red Seal Program, formally known as the Interprovincial Standards Red Seal Program, is a program that sets common standards to assess the skills of tradespeople across Canada.^[8] The Red Seal, when affixed to a provincial or territorial trade certificate, indicates that a tradesperson has demonstrated the knowledge required for the national standard in that trade.

Plumbing is not regulated in Colombia, so anyone can provide this service. Plumbers usually learn the trade because their families work in the construction industry, and they specialize in this field, but anyone can legally offer plumbing services. The most popular training institution for trades is SENA, a public school that provides high-quality education, though it is not mandatory.

In Ireland, a four-year apprenticeship plus qualification exam was necessary for someone to practice professionally. Accreditation of businesses is of great help in order to show their credibility and experience in the job.

National Vocational Qualifications (NVQ) remained the main form of plumbing qualification until they were superseded in 2008 by the Qualification and Credit Framework (QCF)^[9] and then again, in 2015, into the National qualifications frameworks in the United Kingdom. The terms NVQ and SVQ (Scottish Vocational Qualification) are still widely used.^[10]

Plumbers in the United Kingdom are required to pass Level 2 and Level 3 vocational requirements of the City and Guilds of London Institute. There are several regulatory bodies in the United Kingdom providing accredited plumbing qualifications, including City and Guilds of London Institute and Pearson PLC.^[11]

Each state and locality may have its own licensing and taxing schemes for plumbers. Some states license journeymen and master plumbers separately, while others license only master plumbers. To become licensed, plumbers must meet standards for training and experience, and in most cases, pass a certification exam.^[12] There is no federal law establishing licenses for plumbers.^[13]

There are many types of dangers to a plumber. These include electric shock, strains and sprains, cuts and lacerations, bruises and contusions, fractures, burns and scalds, foreign bodies in the eye, and hernias.^[14] Working at height or in confined spaces, or working with lead and asbestos are all on-site dangers that plumbers can face.^[15]

Plumbers risk infections^[16] when dealing with human waste while repairing sewage systems. Microbes can be excreted in the faecal matter or vomit of the sufferer onto the toilet or sewage pipes. Human waste can contain infectious diseases such as cholera, typhoid, hepatitis, polio, cryptosporidiosis, ascariasis, and schistosomiasis.

The term "White House Plumbers" was a popular name given to the covert White House Special Investigations Unit established on July 24, 1971, during the presidency of Richard Nixon. Their job was to plug intelligence "leaks" in the U.S. Government relating to the Vietnam War (i.e. the Pentagon Papers); hence the term "plumbers".^[17]

• Pipefitter
• Piping

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A plumbing fixture is an exchangeable device which can be connected to a plumbing system to deliver and drain water.

The most common plumbing fixtures are:

• Bathtubs
• Bidets
• Channel drains
• Drinking fountains
• Showers
• Sinks
• Tap (connections for water hoses)
  • Tapware - an industry term for that sub-category of plumbing fixtures consisting of tap valves, also called water taps (British English) or faucets (American English), and their accessories, such as water spouts and shower heads.
• Terminal valves for dishwashers, ice makers, humidifiers, etc.
• Urinals
• Toilets
  • Flush toilets

Each of these plumbing fixtures has one or more water outlets and a drain. In some cases, the drain has a device that can be manipulated to block the drain to fill the basin of the fixture. Each fixture also has a flood rim, or level at which water will begin to overflow. Most fixtures also have an overflow, which is a conduit for water to drain away, when the regular drain is plugged, before the water actually overflows at the flood rim level. However, water closets and showers (that are not in bathtubs) usually lack this feature because their drains normally cannot be stopped.

Each fixture usually has a characteristic means of connection. Normal plumbing practice is to install a valve on each water supply line before the fixture, and this is most commonly termed a stop or "service valve". The water supply to some fixtures is cold water only (such as water closets and urinals). Most fixtures also have a hot water supply. In some occasional cases, a sink may have both a potable (drinkable) and a non-potable water supply.

Lavatories and water closets normally connect to the water supply by means of a supply, which is a tube, usually of nominal 3/8 in (United States) or 10 or 12 mm diameter (Europe and Middle East), which connects the water supply to the fixture, sometimes through a flexible (braided) hose. For water closets, this tube usually ends in a flat neoprene washer that tightens against the connection, while for lavatories, the supply usually ends in a conical neoprene washer. Kitchen sinks, tubs and showers usually have supply tubes built onto their valves which then are soldered or 'fast jointed' directly onto the water supply pipes.

The actual initial drain part in a lavatory or sink is termed a strainer. If there is a removable strainer device that fits into the fixed strainer, it is termed a strainer basket. The initial pipe that leads from the strainer to the trap is termed the tailpiece.

Floor-mounted water closets seal to the toilet flange of the drain pipe by means of a wax ring. These are traditionally made out of beeswax. However, their proper sealing depends on proper seating of the water closet, on a firm and secure base (floor), and on proper installation of the closet bolts which secure the closet to the flange, which is in turn supposed to be securely fastened to the floor.^[1]

All plumbing fixtures have traps in their drains; these traps are either internal or external to the fixtures. Traps are pipes which curve down then back up; they "trap" a small amount of water to create a water seal between the ambient air space and the inside of the drain system. This prevents sewer gas from entering buildings.

Most water closets, bidets, and many urinals have the trap integral with the fixture itself. The visible water surface in a toilet is the top of the trap's water seal.

Each fixture drain, with exceptions, must be vented so that negative air pressure in the drain cannot siphon the trap dry, to prevent positive air pressure in the sewer from forcing gases past the water seal, and to prevent explosive sewer gas buildup.

In public facilities, the trend is toward sensor-operated (automatic) fixtures that improve hygiene and save money. For example, sensor operated automatic-flush urinals have fewer moving parts, reduce wear, and tend to last longer than manual-flush valves. Also, they ensure fixtures are flushed only once per use. Some contain intelligence that flushes them at different amounts of water flow depending on traffic patterns: e.g., the fixture can detect a lineup of users and only give a full flush after the last person has used the urinal. For the same purpose, dual-flush toilets are also becoming more popular. A combination of both technologies can allow for saved power and water.

Automatic flush compensates for users who do not bother to flush. Also, since the fixtures are always flushed, there is no need for a urinal cake, or other odor reduction. Sensor-operated toilets also have automatic flush. Sensor-operated faucets and showers save water. For example, while a user is lathering up with soap, the fixture shuts off and then resumes when the user needs it to. Sensor-operated soap and shampoo dispensers reduce waste and spills that might otherwise represent a slippage hazard.

However, many people, especially children, dislike or even fear automatic flush toilets, since they have the tendency to flush without warning, even while the user is still sitting on the toilet. Some parents have started keeping track of public bathrooms that have manual flush toilets, or even carrying post-it notes or other devices with them to temporarily disable the automatic flush sensor.^[2]

These fixtures typically cost more to install than conventional plumbing fixtures, because they require the services (or presence) of both a licensed plumber and a licensed electrician. Construction companies on cost-plus contracts may actually favor these fixtures for this reason, although their clients may not. The additional complexity of these fixtures also complicates repairs, particularly the diagnosis of malfunctions causing unexpected flushing. Few electricians, and fewer plumbers, understand microelectronics well enough for complex diagnosis.

Some widely used standards for plumbing fittings and accessories located between the supply stop and the terminal fitting area are:

• A112.18.1 Plumbing Supply Fittings Standard, American Society of Mechanical Engineers
• A112.18.2 Plumbing Waste Fittings Standard, American Society of Mechanical Engineers

• Automatic balancing valve
• Drain-waste-vent system
• Plumbing
• Tap water
• Trap (plumbing)
• Flushing trough

Mechanical, Electrical, and Plumbing (MEP) refers to the installation of services which provide a functional and comfortable space for the building occupants. In residential and commercial buildings, these elements are often designed by specialized MEP engineers. MEP's design is important for planning, decision-making, accurate documentation, performance- and cost-estimation, construction, and operating/maintaining the resulting facilities.^[1]

MEP specifically encompasses the in-depth design and selection of these systems, as opposed to a tradesperson simply installing equipment. For example, a plumber may select and install a commercial hot water system based on common practice and regulatory codes. A team of MEP engineers will research the best design according to the principles of engineering, and supply installers with the specifications they develop. As a result, engineers working in the MEP field must understand a broad range of disciplines, including dynamics, mechanics, fluids, thermodynamics, heat transfer, chemistry, electricity, and computers.^[2]

As with other aspect of buildings, MEP drafting, design and documentation were traditionally done manually. Computer-aided design has some advantages over this, and often incorporates 3D modeling which is otherwise impractical. Building information modeling provides holistic design and parametric change management of the MEP design.^[3]

Maintaining documentation of MEP services may also require the use of a geographical information system or asset management system.

The mechanical component of MEP is an important superset of HVAC services. Thus, it incorporates the control of environmental factors (psychrometrics), either for human comfort or for the operation of machines. Heating, cooling, ventilation and exhaustion are all key areas to consider in the mechanical planning of a building.^[4] In special cases, water cooling/heating, humidity control or air filtration^[5] may also be incorporated. For example, Google's data centres make extensive use of heat exchangers to cool their servers.^[6] This system creates an additional overhead of 12% of initial energy consumption. This is a vast improvement from traditional active cooling units which have an overhead of 30-70%.^[6] However, this novel and complicated method requires careful and expensive planning from mechanical engineers, who must work closely with the engineers designing the electrical and plumbing systems for a building.

A major concern for people designing HVAC systems is the efficiency, i.e., the consumption of electricity and water. Efficiency is optimised by changing the design of the system on both large and small scales. Heat pumps^[7] and evaporative cooling^[8] are efficient alternatives to traditional systems, however they may be more expensive or harder to implement. The job of an MEP engineer is to compare these requirements and choose the most suitable design for the task.

Electricians and plumbers usually have little to do with each other, other than keeping services out of each other's way. The introduction of mechanical systems requires the integration of the two so that plumbing may be controlled by electrics and electrics may be serviced by plumbing. Thus, the mechanical component of MEP unites the three fields.