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Item # NW50, NW Series Circular Sight Glasses
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Series NW weld pad connection.
Series NW50 3-1/4" Diameter View Weld Pad Style Sight Glass. Series NW sight glasses are manufactured from ASME Section VIII acceptable metals. Each sight glass is thoroughly inspected and will provide long and useful service under the most demanding processing conditions. Optional accessories include Type I wiper, Type II wiper and Type I spray washer or Type II spray washer assemblies. Series NW sight glasses are also available with Series PL, MSL, SLEX, REX, or FBX illuminators.
ASME code calculations and any resulting additional material needed to reinforce sight glass opening to meet ASME code is the responsibility of the buyer.
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- Lower flanges constructed of carbon steel and stainless steel are standard. Virtually any machinable alloy can be specified to meet user requirements.
- Sizes NW50, NW80, NW100, and NW125 have standard ratings of 150 PSIG (10.3 Barg) pressure and full vacuum at 300 ºF (149 ºC) temperature. NW150 and NW200 are rated standard for 125 PSIG (8.6 Barg) pressure and full vacuum at 300 ºF (149 ºC) temperature. Higher pressure and temperature ratings are available upon request.
- The Papailias Co. sight glass lens is tempered soda lime for operating temperatures up to 300 ºF (149 ºC) standard. Tempered borosilicate lens material is available for operating temperatures up to 500 ºF (260 ºC). Lenses of quartz, Vycor®, and BoroAlloy™ are also available for higher temperatures.
- The standard sight glass seal gasket is neoprene. PTFE, Viton®, EPDM, and silicon rubber seal gaskets are also available from stock. Virtually any elastomeric material may be specified to meet operating conditions.
- The lower flange can be supplied thicker if required to reinforce the vessel opening in accordance with ASME Section VIII requirements.
- The lower flange can be provided curved cylindrically or spherically to match the vessel geometry.
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