Armstrong 180-LD Series stainless steel, free floating lever liquid drainers use the same bodies, caps, lever mechanisms, valves, and seats as Armstrong inverted bucket steam traps that have been proven in years of service. Elliptical floats and high leverage make it possible to open large orifices to provide adequate capacity for drain trap size and weight.

The hemispherical valve, seat, and leverage of the 180-LD and 181-LD stainless steel traps are identical in design, materials, and workmanship to those for saturated steam service up to 570 psig (39 bar), except that the 180 Series traps have a guidepost to ensure a positive, leak-tight valve closing under all conditions. The 180 Series is designed for situations where mounting a drainer close to the floor is critical. A back vent connection is required.

List of Materials

Model No.	Valve & Seat	Leverage System	Float	Body & Cap
180-LD 181-LD	Stainless Steel	Stainless Steel	Stainless Steel	Sealed Stainless Steel 304L

Physical Data

Model No.	180-LD	181-LD
Pipe Connections	1/2 in (15 mm)	3/4 in (20 mm)
"A" (Diameter)	2-11/16 in (68 mm)	2-11/16 in (68 mm)
"B" (Height)	6 in (152 mm)	7-1/4 in (184 mm)
"C" (Face to Face)	4-5/16 in (110 mm)	4-5/16 in (110 mm)
"D" (Bottom to C Inlet)	5-1/8 in (130 mm)	6-9/32 in (160 mm)
"P"	1/2 in (15 mm)	3/4 in (20 mm)
Weight	1-3/4 lb (0.8 kg)	2-3/8 lb (1.1 kg)
Max. Allowable Pressure (Vessel Design)	500 psig @ 100°F (35 bar @ 38°C) 440 psig @ 500°F (30 bar @ 260°C)	500 psig @ 100°F (35 bar @ 38°C) 440 psig @ 500°F (30 bar @ 260°C)

INFO

Vessel design pressure may exceed float collapse pressure in some cases. Pipe size of vent is same as that of inlet and outlet connections.

High Temperature Service

WARNING

Maximum allowable working pressures of floats decrease at temperatures above 100°F (37.8°C). Allow for approximately:

• 10% decrease at 200°F (93.3°C)
• 15% decrease at 300°F (148.9°C)
• 20% decrease at 400°F (204.4°C)

Installation

The 180-LD Series features 3 connections: Side Inlet, Top Gas Outlet, and Side Liquid Outlet. Possible connections include screwed or socketweld.