Duct Protecting Tubes:
Material (unless
Type
otherwise noted)
___________________________________
____________________
25 mm Schedule 80 pipe, closed end
Wrought iron
25 mm standard weight pipe, closed
Type 446 stainless
end
steel
Adapter: Furnish adjustable flange type collar with
companion flange to provide airtight seal on a 50 mm
pipe nipple fastened on the duct or casing. The
adapter must completely support the tube; no
intermediate supports will be provided.
Material (unless
Type
otherwise noted)
___________________________________
____________________
1 inch Schedule 80 pipe, closed end
Wrought iron
1 inch standard weight pipe, closed
Type 446 stainless
end
steel
Adapter: Furnish adjustable flange type collar with
companion flange to provide airtight seal on a 2 inch
pipe nipple fastened on the duct or casing. The
adapter must completely support the tube; no
intermediate supports will be provided.
**************************************************************************
Provide a well for each temperature sensing element (thermometer,
thermocouple, remote bulb) unless otherwise noted. Include specifications
of insertion length, shipping protection, bore, material, and any necessary
adapters.
2.12.6
Pressure Gages
Gage connections shall be bottom for flush, surface or line mounting.
Furnish scale ranges to produce a reading 60 to 70 percent of full scale
during normal operating conditions. Service legends shall be printed on
the gage face by the manufacturer. Include adjustments for set point and
proportional band of pressure controllers. Provide pressure gages
indicating supply and control pressures. Provide cleanout push button for
cleaning restricted feed orifice without dismantling. Case shall be
dust-tight with air bleed hole. Pressure switch elements shall be dry
contact (mercury switch contacts not acceptable) rated for at least
120-volt AC, 4 amperes or 125-volt DC, 0.5-amperes. Contacts shall be
single-pole-dual-throw, or as specified. Switch enclosure shall be NEMA
12. Sensing element shall be type and material suitable for the service.
Factory adjust each switch to the proper setting before shipment to
jobsite. Indicate the factory setting on the device tag. Provide brass
pulsation dampeners and liquid fill with high viscosity silicon oil for all
gages used for steam, water, air, or liquid service. Diaphragm seal
materials shall be 316 stainless-steel diaphragm and bottom housing with a
carbon steel top housing. Provide tip bleed feature for bourdon tube in
pressure sensing element. Provide pigtail siphons for pressure gages in
steam service. Fabricate siphons from 6 mm 1/4 inch seamless carbon-steel
SECTION 15864N
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