Armstrong 880–883 Inverted Bucket Steam Traps

Cast-iron horizontal inverted-bucket traps with integral strainer — same capacity ladder as 800–813, plus built-in straining for dirtier steam lines.

Key advantages

Integral strainer — cast-iron IB package with strainer for horizontal installs.
Capacity match to 800–813 — 880: 700; 881: 1,050; 882: 2,200; 883: 4,400 lb/hr.
Pressure class — MAP 250 psig @ 450 °F; 880 MOP 150 psig; 881–883 MOP 250 psig.
Repairable — free-floating SS mechanism; continuous air/CO₂ venting; water-hammer resistant.

Typical applications

Steam equipment needing IB drainage plus integral straining.
Screwed NPT/BSPT horizontal lines from ½…1¼ in. by model.

Selection guide

880 — 700 lb/hr; MOP 150 psig; ½ / ¾ in.
881 — 1,050 lb/hr; MOP 250 psig; ½ / ¾ / 1 in.
882 — 2,200 lb/hr; MOP 250 psig; ½ / ¾ in.
883 — 4,400 lb/hr; MOP 250 psig; ¾ / 1 / 1¼ in.
Differentiator vs 800 — integral strainer on 880 series.

Common mistakes

Ordering 800-series when integral strainer is required (or vice versa).
Using 880 above 150 psig MOP.
Ignoring orifice/differential pressure when stating capacity.
Steam & condensate

When to RFQ / what to tell us

Model (880–883) or capacity/pressure; confirm strainer need.
Connection size; NPT vs BSPT; options.
Quantity; ship-to country.

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Specs

Spec	Value
SKU	254281
Brand	Armstrong International
Model	880 / 881 / 882 / 883
Product type	inverted bucket steam trap with integral strainer
Max allowable pressure	250 psig @ 450 °F (17 bar @ 232 °C)
Max operating pressure	880: 150 psig; 881–883: 250 psig
Capacity	700 / 1,050 / 2,200 / 4,400 lb/hr by model
Process connection	Screwed NPT and BSPT (½–1¼ in. by model)
Notes	Specs from Armstrong 880 Series product page and Data_Series880 PDF.

Documents

Armstrong 880 Series inverted bucket data sheet (PDF)

FAQ

Q: 880 vs 800 — what’s the difference? A: Capacity/pressure ladders are aligned; 880 series adds an integral strainer.

Q: What should I send for a quote? A: Model, connection, P/T, capacity, options, quantity. Compatible with systems using Armstrong 880-series if you need a drop-in check — we do not claim authorized-dealer status.