TCS 682 METER INSTALLATION

A. PLUMBING CONFIGURATION

Meters and piping should be installed to prevent drainage of product from the meter when the system is not running. One way to do this is to have the inlet and outlet of the meter lower than the associated system plumbing (sump position). Also, undue strain on the meter's 150# flanges from the connecting piping must be avoided.

B. SLOW FLOODING OF SYSTEM

When a pump is turned on and a valve opened in a new, dry system, tremendous pressure can be built up in the piping and forced through the meter. The high pressure air causes the meter to operate more quickly than normal. When product reaches the meter, there is an abrupt slowing of the meter plungers which could cause damage to the register, plunger, gears or other components.

The recommended method of starting any system is to flood the piping gradually. This allows product to slowly force the air from the entire system.

C. PROTECTION OF DEBRIS

On new installations, care must be taken to protect the meter from damage during start-up. Damage may result from the passage through the meter of welding slag or spatter, thread cuttings, rust, etc. There are several methods of protecting meters from this material including: the insertion of a spool (a flanged length of pipe equal in length to the meter and any accessories attached to the meter) in place of the meter until the system is flushed, temporarily bypassing the plumbing around the meter, or by installing a strainer ahead of the meter in the line.

D. CALIBRATION

The meter's calibration must be checked (and adjusted, if necessary) using the product being metered by the user. Generally, any meter's accuracy is maximized by calibrating it to a specific product and installation. The 682-15 meter exceeds the accuracy requirements specified NIST Handbook 44, which is plus or minus 0.2% at the factory. In the field, NIST Handbook 44 maintenance test accuracy requirements are plus or minus .5% on a slow test, and plus or minus 0.3% on a fast test. In a five gallon test, 0.2% = 2.31 cubic inches, 0.3% = 3.47 cubic inches, and 0.5% = 5.78 cubic inches. Click here for 682 calibration instructions.