What is a discharge stack?
The term ‘drainage stack’ or ‘drain stack’ is commonly used in the United States, and sometimes in commercial construction in the UK. In very broad terms, it refers to a vertical pipe or stack that spans through one or more floors and into which drains from a property are connected to take waste water to a sewer.
Why is exhaust fan necessary in chemistry lab?
Exhaust system basics The main purpose of a fume-hood exhaust system in a laboratory is to remove contaminated air resulting from chemical fumes, reactions and other laboratory activities. The system must provide maximum protection while using the least possible amount of air.
What is a discharge stack in plumbing?
discharge stack means any vertical discharge pipe which conveys the discharge from two or more sanitary fixtures and which is connected directly to a drain; Sample 1.
What is drainage system in building?
DRAINAGE SYSTEM It is the arrangement provided in a house or building for collecting or conveying waste water through drain pipes, by gravity, to join either a public sewer or a domestic septic tank is termed as house drainage or building drainage. AROH THOMBRE.
How do you ventilate a lab?
7.2. In a non-responsive system general lab ventilation should set- back to 4 air changes per hour (ACH) outside of working hours and should aim for as low as possible to achieve safety during working hours.
Are fans allowed in laboratories?
Are fans allowed in patient care areas, laboratories, or other support areas in an organization? There are no specific Joint Commission standards that prohibit the use of fans.
What is a discharge pipe?
Definitions of discharge pipe. a pipe through which fluids can be discharged. types: hydrant. a discharge pipe with a valve and spout at which water may be drawn from the mains of waterworks. fire hydrant, fireplug, plug.
How do you size a discharge pipe?
He said his rule of thumb was to size the discharge pipe to that of the pump’s discharge flange. For example, if the pump’s discharge nozzle was 150mm, he would use a 150mm nominal size pipe for his discharge header.
What is the Ach of a lab?
General laboratories using hazardous materials shall have a minimum of 6 air changes per hour (ACH). Exhaust ventilation shall be continuous.
What are the types of ventilation?
There are three methods that may be used to ventilate a building: natural, mechanical and hybrid (mixed-mode) ventilation.
What should be the discharge velocity of a building?
A discharge velocity of 2,500 fpm (12.75 m/s) prevents downward flow of condensed moisture within the exhaust stack. It is good practice to make the terminal velocity at least 3,000 fpm (15.3 m/s) to encourage plume rise and dilution. These factors affect the dilution of the exhaust stream and the plume trajectory.
How is the hood discharge of a building chosen?
The basic challenge in locating the hood discharge is to avoid re-entrainment of effluent into any building air intake or opening and to minimize exposure of the public. The selection of stack height is dependent on the building geometry and airflow pattern around the building and is as variable as meteorological conditions.
Which is the most important factor in stack design?
Several factors are critical in determining the design of a stack. Volume: The most critical parameter for stack design is the volume of air that is being discharged. The volume will determine the stack diameter required to achieve the desired air exit velocity that is used in the modeling process.
How tall should an exhaust dispersion stack be?
Labs21 Advanced Course Series | Advanced Exhaust Dispersion Design Prescriptive Design Guidelines: Stack Height •ANSI/AIHA Standard Z9.5 – 10 ft above adjacent roof line •Standard NFPA 45 – minimum 10 ft height to protect rooftop workers