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Plumbing systems are classified into three types: Potable, sanitary, and stormwater plumbing. Each of these categories is important, and each system fulfills a distinct function. The combined efforts of these systems eventually provide a structure with water and remove water and waste from the structure.

The potable system brings drinking water into the building, the sanitary system removes waste, and the stormwater system directs rainwater away from the building.

Potable Plumbing System
A potable plumbing system brings water from the source into a building for human use. There is a plumbing valve located on the main water supply so that, if necessary, you can turn off the water supply. Additionally, a water meter is set up to record the water consumed within the structure.

The potable system moves water that can be consumed, used for cleaning, and other similar purposes, indicating that the water is fit for human consumption. Various pipes and fittings manage water distribution to each appliance in the particular building. They include:

Straight pipes. These are some more typical pipes that transport potable water in the system. Straight pipes can be very long or short, yet they efficiently transport water to its destination.

T-section. These piping systems have a right-angle configuration to them.

Elbows. In the plumbing system, directional adjustments are accomplished with the help of these pipes.

Brass and Gate Valves. The regulation of water flow is the principal purpose served by these appliances.

Sanitary Plumbing System
A plumbing system in a building is responsible for removing all waste from the structure. This trash consists of human waste and wastewater produced by activities such as cooking and washing. In addition, the waste is disposed of in the sewage system of the neighborhood community.

They are attached to the ceiling to ventilate gases and make it possible for the system to function at atmospheric pressure. Three different kinds of systems can be put in place for sanitary plumbing systems. They include:

Gravity system. The gravity system is the type of sanitary system used the most frequently. These make easy work of collecting wastewater and transporting it to the sewage network by taking advantage of the natural slope of the land. In addition, these are typically used in regions that are not prone to floods and have a water table that is not particularly high. It is necessary to understand How Long Does It Take for Water to Damage a Foundation and how can it be affecting your plumbing systems and how to use the right products.

Low-Pressure Systems. These are an alternative to the gravity system. The system consists of an interceptor tank with a chamber unit that houses a tiny electrical pump. This unit is located within the system.

Vacuum Systems. The vacuum system is yet another option for gravity-based systems. Instead of relying on gravity, this one uses electricity and is mostly put in certain locations. These can be seasonal places, flat areas, areas with reclaimed earth, or areas that have been charged with electricity.

The sewage fittings are connected through vacuum valves and a central vacuum station. Additionally, the central vacuum station is equipped with vacuum pumps, discharge pumps, a collection chamber, and controls related to these components.

Stormwater Plumbing System
The removal of precipitation from within the structure is the primary objective of the plumbing systems that deal with stormwater. To ensure that the water is successfully carried away, they are placed with characteristics that meet certain requirements. Water can be gathered and transported promptly with the assistance of these three systems:

Gravity-Fed Systems. Here pipes are slanted so that the water can flow unobstructed through the drainage systems. The amount of rainfall and the size of the area are the two primary factors that decide the diameter of the pipes.

Pump-Based Systems. Pumps may be required when the ground slope does not allow for gravity-fed systems to function properly. These typically collect rainwater in tanks and then pump the water to the required location.

Stormwater Discharge and Harvesting. This system is used to transport water to nearby rivers, lakes, and oceans. Larger pipes and channels can be constructed. However, this kind of system almost always results in pollution being introduced into the natural rivers, and it does so mostly in more populated regions.

Plumbing Products

Boston’s Top Plumbing Supplier

Metropolitan Pipe specializes in the commercial plumbing market, and we are proud to stock the top manufacturers listed below. No job is too big or too small – Metropolitan Pipe services everyone – from one-man plumbing shops up to top institutions and government entities.

  • Aqua-Bath Showers
  • Aquapure CUNO Filters
  • Aquatic Showers
  • Bradley Plumbing
  • Brasscraft Supplies & Stops
  • Chicago Faucets
  • Church Toilet Seats
  • Delta Faucets & Parts
  • Elkay Stainless Steel Sinks
  • Franklin Wastes
  • Gerber Faucets & Tub Drains
  • Grohe
  • Halsey Taylor Water Coolers
  • Hansgrohe
  • Insinkerator Disposers
  • Japco Hose Stations
  • Kohler Fixtures & Faucets
  • Leonard Water Temp. Controls
  • Mansfield Fixtures
  • McGuire Supplies, Stops & Traps
  • Moen Faucets
  • Mustee Laundry Tubs & Mop Basins
  • Mustee Showers & Mop Basins
  • Navien Indirect Water Heaters
  • Orion Neutralization Tanks
  • Ruud Water Heaters
  • Sloan Flush Valves
  • Speakman Faucets & Emergency
  • Sterling Plumbing
  • Symmons Valves
  • T & S Brass Faucets & Fittings
  • Trap Guard
  • Truebro Trapwrap
  • Watts Back Flow Preventers


30 INNER BELT RD, SOMERVILLE, MA 02143  • Toll-free Phone: 1.800.METPIPE (Local: 1.617.492.6400)  • Fax: 1.617.354.3869
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Metropolitan Pipe & Supply Co. is a leading independent wholesale distributor of plumbing, heating, pipe, valves, fittings, and industrial supplies throughout New England. We are proud to supply the industries top brands including: Aqua-Pure, Chicago Faucets, Delta, Kohler, Mansfield, Navien, Ruud Rheem, Sloan, Grundfos, Lochinvar, Slantfin, Tekmar, Viega, Watts, Weil-McLain, Brady, Irwin, Lenox, Liberty Pumps, Little Giant, Powers, Ridgid, Zoeller, American Valve, Apollo / Conbraco, Centerline, Cimpress, Crane, Jenkins, Nibco, Powell, United, Aquatherm, Gastite, Grinnell, Hollaender, Orion and ProPress. We are Boston's largest repair parts counter stocking American Standard, Chicago, Gerber, Halsey Taylor, Leonard, Symmons, T&S and more.