NPCP Part 3

Waterseal Trap

Separately traps plumbing fixtures, excluding integral traps, with approved waterseal trap

Single Compartment Sinks

Up to three sinks of the same depth can share one trap if waste outlets are close

Food Waste Disposal Unit

Each unit must have its own trap in commercial sinks; laundry tubs need separate traps

Tailpiece

Vertical distance between fixture outlet and trap weir, max length 0.6 meters

Flow Control Device

Device limiting flow in plumbing fixtures to match grease trap capacity

Grease Trap Capacity

Minimum flow rate required based on connected fixtures, not exceeding 2.5x trap capacity

Fixture

Includes plumbing fixtures, appliances, or equipment connected to a grease trap

Grease Trap Maintenance

Regular removal of grease and solids, preventing introduction into drainage systems

Water Seal

Required seal depth in a grease trap, not less than 51 mm or outlet diameter

Grease Interceptors

For commercial kitchens, with sizing criteria provided in Appendix B

Food Waste Disposal

Prohibited connection to grease traps unless permitted by Administrative Authority

Trap Arm Distance

Horizontal distance between trap arms, specified in Table 10-3

Trap Design

Traps for various fixtures must be self-cleaning, of specific materials, and have uniform waterways

Slip Joint Fitting

Limit of one fitting on trap outlet side, tubing traps require listed adapter

Grease Interceptor Sizing

Calculation based on waste flow rate, retention times, and storage factors for peak meals

Laundry Interceptor

Includes a removable wire basket to prevent solids larger than 12.7 mm from entering drainage

Sand Interceptor Construction

Built of brick, concrete, or coated steel, with baffles, specific dimensions, and inlet area adjustments

Storm Drainage System

Required for collecting and disposing of stormwater from roof areas, courts, and courtyards

Rainwater Systems

Regulations for materials used in rainwater downspouts or conductors based on building height and location

Downspouts

Vertical pipes for rainwater drainage from high-rise buildings

Hydrostatic Pressure

Pressure exerted by a fluid due to gravity at equilibrium

Pipe Chase

Enclosed space for pipes, often for vertical downspouts

Rainwater Piping

Pipes for directing rainwater away from a building

Approved Materials

Materials meeting code requirements for use in construction

Roof Drains

Drains on roofs to direct rainwater to the ground

Strainers

Devices to prevent debris from clogging drains

Dome-Type Strainers

Strainers with a dome shape to increase inlet area

Roof Deck Strainers

Strainers for specific roof areas like sun decks

Watertight

Completely sealed to prevent water leakage

C.I. Drain

Cast iron drain pipe

Flashings

Materials used to prevent water penetration at joints

Sizing of Rainwater Piping

Determining the appropriate diameter of rainwater pipes

Rainfall Intensity

Amount of rain falling per unit area in a given time

Storm Water

Water from precipitation that flows over surfaces

Roof Gutter

Channel at the edge of a roof to collect and divert rainwater

Adjustment Calculation

Modifying values based on actual rainfall compared to standard

Inscribed Circle

Circle within a polygon that touches all sides of the polygon

Gross Area

Total area including all surfaces, often used for drainage calculations

Leader and Downspout

Vertical pipe for rainwater drainage from roof to ground

Slope

Incline or decline of a surface, often used in drainage systems

Circular Bottom Gutters

Gutters with a semicircular cross-section at the bottom

Maximum Roof Area

Largest area of a roof considered for drainage calculations

Adjustment Formula

Mathematical equation to modify values based on specific conditions

Leader

Pipe for rainwater drainage from roof to ground

Downspout

Pipe for carrying rainwater from gutters to ground level

Semi-Circular Bottom

Shape of the gutter base for efficient water flow

Pipe Slope

Gradient of the pipe for proper water flow

Table Lookup

Method to find gutter size based on roof area and rainfall

Adjustment Factor

Multiplier for gutter size adjustment based on actual rainfall

Square Meter Calculation

Method to find pipe diameter capacity based on rainfall

National Plumbing Code

Regulatory guidelines for plumbing standards in the Philippines

Horizontal Rainwater Piping

Pipes carrying rainwater horizontally from gutters

Rectangular Gutter Width

Width calculation based on gutter diameter

Public Sewer Connection

Mandatory link for buildings to a public sewage system

Private Sewage Disposal System

Approved alternative for buildings without public sewer access

Building Sewer Materials

Approved materials for constructing building sewers

Jointing Methods

Techniques for connecting building sewer components

Building Sewer Markings

Identification requirements for building sewer components

Size Determination

Method to calculate minimum building sewer size based on fixture units

Building Sewer Grade

Required slope for efficient drainage flow

Support and Protection

Guidelines for laying and securing building sewer pipes

Firm Bed Requirement

Necessary foundation for building sewer piping

Underground Installation

Depth regulation for building sewer materials

Rainwater Discharge

Regulations for connecting surface water to drainage systems

Cesspool and Septic Tank Effluents

Prohibition on connecting these to building sewers

Food Waste Grinder

Restrictions on connecting commercial grinders to sewage systems

Holding Tank Installation

Requirement for specific tanks needing periodic emptying

Building Sewer Materials Approval

Process for verifying materials compliance with regulations

Building Sewer Size Limit

Minimum diameter requirement for building sewers

Uniform Slope Requirement

Consistent gradient needed for proper building sewer flow