NPCP Part 4

Revised National Plumbing Code

Regulatory document for plumbing standards in the Philippines

Polyethylene (PE) Pipe

Smoothwall pipe for drainage and waste disposal absorption fields

Chlorinated Polyvinyl Chloride (CPVC)

Socket type plastic pipe fittings, Schedule 40 and 80

Polyvinyl Chloride (PVC) Pipe

Socket type plastic pipe fittings, Schedule 80

Solvent Cement

Adhesive for ABS, CPVC, and PVC pipe and fittings

Acrylonitrile-Butadiene-Styrene (ABS)

Material for plastic pipe and fittings

Vitrified Clay Pipe

Extra strength pipe for drainage and perforated applications

Enamelled Cast Iron Fixtures

Plumbing fixtures made of cast iron with an enamel coating

Whirlpool Bathtubs

Jetted bathtubs for relaxation and hydrotherapy

Plastic Bathtub Units

Complete bathtub assemblies made of plastic

Plastic Lavatories

Sinks made of plastic material

Shower Receptors

Plastic units for shower enclosures

Water Closet Bowls and Tanks

Toilet bowls and tanks made of vitreous china

Plumbing Fixtures for Land Use

Fixtures designed for outdoor plumbing applications

Hand Held Showers

Portable showerheads for flexible use

Formed Steel Plumbing Fixtures

Plumbing fixtures made of formed steel

Suction Fittings

Fittings for water features like pools and hot tubs

Backflow Prevention Devices

Devices to prevent water contamination in plumbing systems

Gate Valves

Valves to control flow in pipes with a gate mechanism

Globe Valves

Valves with a globe-shaped body for flow control

Hose Connection Vacuum Breakers

Devices to prevent backflow in hose connections

Temperature Actuated Mixing Valves

Valves to regulate water temperature in plumbing systems

Trap Seal Primer Valves

Valves to maintain water seals in drain traps

Flush Tank Ballcocks

Mechanism to control water flow in toilet flush tanks

Water Pressure Reducing Valves

Valves to reduce and regulate water pressure in pipes

Hydrants

Outdoor water outlets with automatic draining and backflow prevention

Storage Type Water Heaters

Water heaters with storage tanks and inputs for water supply

Automatic Storage Type Water Heaters

Devices with inputs less than 50,000 Dtu per hour

Circulating Tank

Component in large automatic storage type water heaters

Compression Joints

Used for vitrified clay pipe and fittings

Polyethylene Pressure Sensitive Corrosion Tape

Preventive tape for pipelines

Pre-Fabricated Septic Tanks

Ready-made tanks for sewage disposal

Rubber Gaskets

Seals for cast iron soil pipe and fittings

Rubber Rings

Seals for asbestos-cement pipe joints

Solder

Alloy used for plumbing connections

Lead-Free Sealing Compound

Material for threaded joints

Poly (Vinyl Chloride) Flexible Water-Containment Membrane

Material for water containment

Polyethylene Encasement Sleeve

Protective covering for portable water pipes

Protectively Coated Pipe

Installation requirement for coated pipes

Point-Of-Use Low Pressure Reverse Osmosis Drinking Water Systems

Systems for purified water at specific points

Motor-Driven Pumps

Pumps powered by motors

Ice Makers

Devices for making ice cubes

Household Food Waste Disposer Units

Devices for disposing of food waste

Household Dishwashers

Appliances for washing dishes

Household Laundry Equipment

Plumbing requirements for laundry appliances

Household Water Softeners

Devices for softening water

Household Water Filters

Systems for filtering water

Household Electric Storage Tank Water Heaters

Tanks for heating water

Household Dishwashers Drain Hose

Plumbing requirements for dishwasher drainage

Household Dishwashers Plumbing Requirements

Specifications for dishwasher plumbing

Household Dishwashers (Plumbing Requirements For)

Guidelines for dishwasher plumbing

Household Commercial and Portable Exchange Water Softeners

Devices for water softening

Home Laundry Equipment Plumbing Requirements

Regulations for laundry plumbing needs

Friction Loss

Pressure reduction in pipes due to resistance from flow

Fixture Units

Measure of water flow demand for plumbing fixtures

WSFU

Water Supply Fixture Unit, quantifies fixture water demand

Equivalent Length of Pipe

Length of straight pipe that causes the same friction loss as fittings

Demand Load

Total water flow required for fixtures in a building

Flushometer Valve

Valve for flushing water closets, uses 6 WSFU

Flush Tank

Tank for flushing water closets, uses 3 WSFU

Pressure Reducing Valve

Device to lower water pressure in a building's supply

Branches and Risers Sizing

Determining pipe sizes for different levels in a building

Velocity Limit

Maximum water speed in pipes, usually 3 m/sec

Developed Length of Pipe

Total length of pipe from the main to a fixture

Chart A-2

Estimate curves for demand load in plumbing systems

Chart A-4

Shows friction loss for copper tubing and smooth pipes

Chart A-5

Used for ferrous pipe with favorable water supply conditions

Chart A-7

Applicable for corrosive water supply conditions

Annex A

Section providing recommended rules for water supply system sizing

Sizing Rules

Guidelines for determining water supply system dimensions

Smooth Pipe

Type of pipe with minimal surface roughness

Type M

Specific category of copper tubing

Type K

Another category of copper tubing

Private Sewage Disposal Systems

Regulations for connecting building sewers to private disposal systems

Septic Tank

Underground tank for sewage treatment

Capacity Tables

Specifications based on building occupancy for septic tanks

Percolation Test

Assessment of soil's ability to absorb liquid

Manholes

Access points to septic tanks for maintenance

Baffles

Partitions in septic tanks to control flow

Liquid Depth

Depth of liquid in septic tanks

Ventilation

Allowing air circulation in sewage disposal systems

Inlet and Outlet Pipes

Connections for sewage inflow and outflow in tanks

Materials for Tanks

Specifications for constructing septic tanks

Concrete Tanks

Septic tanks made of concrete material

Steel Tanks

Septic tanks constructed from steel material

Alternate Materials

Approved materials other than concrete or steel for tanks

Prefabricated Tanks

Factory-made septic tanks meeting standards

Distribution Lines

Pipes distributing effluent in disposal fields

Clay Tile

Material used for constructing distribution lines

Perforated Pipe

Pipe with holes for effluent distribution