scope:

Description

Chemical dispensing systems provide a means of mixing potable water with chemicals to provide the user with a chemical solution which is ready for use. The amount of dilution shall be fixed or adjustable. This standard applies to those devices classified as chemical dispensing systems having a self-contained means of backflow protection.

The devices shall be classified as follows:

(a) Type A: These devices have the chemical(s) pressurized above atmospheric pressure; and

(b) Type B: These devices do not pressurize the chemical(s) above atmospheric pressure.

The only source of back pressure comes from an elevated hose