STEAM REQUIREMENTS (Steam Drying Tumblers)

The size of the steam service pipe is dependent upon many variables (length, tees, high pressure system, low pressure system, etc.). Specific pipe size information should be obtained from the steam system supplier or a qualified steam fitter.

1.Refer to Figure 9 for proper steam pipe configurations.

2.To prevent condensate draining from headers to tumbler, piping should have a minimum 12 inch rise (30.5 cm) above respective header. Do not make steam connection to header with a horizontal or downward facing tee or elbow.

3.Whenever possible, horizontal runs of steam lines must drain, by gravity, to respective steam header. Water pockets, or an improperly drained steam header will provide wet steam, causing improper operation of tumbler. If pockets or improper drainage cannot be eliminated, install a bypass trap to drain condensate from the low point in the steam header to the return.

4.In both steam supply and steam return line, it is recommended that each have a pipe union and globe valve. This will enable you to disconnect the steam connections and service the tumbler while your facility is in operation.

5.Before connecting trap and check valve to tumbler, open shut-off valve in steam supply line and allow steam to flow through tumbler to flush out any dirt and scale from tumbler. This will assure proper operation of trap when connected.

6.After flushing system, install vacuum breaker, bucket trap (with built-in strainer) and check valve. For successful operation of tumbler, install trap 18 inches (45.7 cm) below coil and as near to the tumbler as possible. Inspect trap carefully for inlet and outlet markings and install according to trap manufacturer’s instructions. If steam is gravity returned to boiler, omit trap but install vacuum breaker and check valve in return line near tumbler.

7.Install union and shut-off valve in return line and make final pipe connections to return header.

PIPING RECOMMENDATIONS

1.Trap each steam coil individually. Always keep the trap clean and in good working condition.

2.When tumbler is on the end of a line of equipment, extend header at least 4 feet (1.2 m) beyond tumbler. Install shutoff valve, union, check valve and bypass trap at end of line. If gravity return to boiler, omit trap.

3.Insulate steam supply and return line for safety of operator and safety while servicing tumbler.

4.Keep tumbler in good working condition. Repair or replace any worn or defective parts.

NOTE: Steam heated tumbler models are not certified by the American Gas Association or the Canadian Gas Association.

WARNING

The flexible steam hoses connecting the coil outlet connections and steam traps must have a minimum of 172 psig (pounds per square inch gauge) (12.04 kg/sq. cm) working pressure. A shut-off valve must be installed downstream from each steam trap so the condensate return line can be isolated in event a steam trap requires maintenance.

W064

STEAM VALVE ELECTRICAL CONNECTIONS

Refer to wiring diagram for steam valve electrical connections in J-Box.

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