regenerator heater shall be of the plate-and-frame type, with carbon steel
frame carrier bars and tiebolts; titanium plates and nitrile or EPDM
gaskets.
2.7.2.1
Piping
**************************************************************************
NOTE: Edit Section 15400A to the extent necessary
to specify FRP and CPVC piping, valves and pressure
testing of piping system.
**************************************************************************
The conditioner piping shall be FRP or CPVC rated for continuous service at
107 degrees C 225 degrees F with the desiccant solution. FRP piping shall
be used for the regenerator. Blackiron, galvanized and stainless steel
shall not be used. CPVC piping shall be Schedule 80, Type IV, Grade 1,
4120, in accordance with ASTM D 1784, as specified in Section 15400A
PLUMBING, GENERAL PURPOSE. The piping shall be supported so that no stress
is placed on connections to the equipment. Piping shall be installed at
least 610 mm 2 ft away from all maintenance access openings and belt
guards. Solution pump discharge piping must be arranged to allow removal
of the pump from the pump tank. The pump discharge piping shall
incorporate a 90 degree elbow or a vertical spool piece at least 1.2 m 4 ft
long so the pump can be lifted vertically from the tank. All piping shall
be pressure tested for leaks before insulating. If possible, equipment
start-up should be completed before the insulation is applied.
2.7.2.2
Valves and Thermowells
Valves in the conditioner solution piping shall be made of CPVC,
thermoplastic-lined cast iron, or as recommended by the manufacturer.
Thermowells in the solution piping shall be monel or TFE-coated steel.
Stainless steel thermowells are not acceptable. All pipe fittings shall be
flanged when possible. Threaded fittings and connections shall be avoided.
Red rubber or neoprene full-face gaskets shall be used in flanged
connections.
2.7.2.3
Insulation
Conditioners shall be insulated whenever a coolant other than cooling tower
water is used to prevent surface condensation. The entire unit including
the solution and coolant piping shall be insulated. Flexible rubber, rigid
foam plastic, or other non-permeable, vapor-tight insulation material shall
be used for conditioners. When the equipment is installed outside, an
ultraviolet and weather protective coating should be applied to the
insulation. Regenerators and steam or hot water piping should be insulated
with 50 mm 2 inch of rigid, foil- or plastic-faced, fiberglass board.
Solution piping shall be insulated if required for personnel protection.
If the equipment is installed outside, weather protective covering shall be
applied. The outer casing of the conditioner and regenerator shall not be
penetrated with insulation fasteners. Contact cement or other adhesive as
recommended by the insulation manufacturer for use with an FRP substrate
shall be used for insulation fastening. Insulation shall conform to
Section 15080A THERMAL INSULATION FOR MECHANICAL SYSTEMS.
SECTION 15500A
Page 20
Previous Page
