Jacoby Tarbox — Sight Flow Indicators
NPT 150# ANSI Rated
Full ANSI 150# P-T Rating · 285 PSI @ -20 to 100°F · Flapper, Plain, Drip, Rotary & Flutter Types
NPT 150# ANSI Rated — Threaded Bulls-Eye
Full ANSI 150 Class code-rated threaded sight flow indicators. Five indicator styles: flapper (100-SA), plain (100-SA NF), drip (200-SA), rotary (300-SA), flutter (100-SA-FLTR). FNPT connections per ANSI B2.1. All units hydrotested at 1.5× rated pressure.
The NPT 150# ANSI Rated series provides full ANSI 150 Class pressure-temperature compliance for installations requiring code-rated construction. Engineered per ASME B31.1 & B31.3 Power & Chemical Piping Codes with FNPT connections per ANSI B2.1. Available in five indicator types — flapper (100-SA), plain (100-SA NF), drip (200-SA), rotary (300-SA), and flutter (100-SA-FLTR) — with independently threaded retainers machined from corrosion resistant alloys. Stainless steel engraved identification faceplate standard. All units hydrotested at 1-1/2 times rated pressure.
Available Models
Employs a 316SS hinged wheel weighted flapper to indicate flow media. The velocity of the flow is indicated by the position of the flapper. Uni-directional, these units are optimal for horizontal or vertically upward flows. Full ANSI 150# pressure-temperature rating.
Sizes
1/8" – 2" FNPT
Pressure
150 Full ANSI Class (285 PSI @ -20 to 100°F, Carbon Steel)
Temperature
Up to 500°F (material dependent)
Flow Direction
Horizontal and upward vertical (uni-directional)
Body
Carbon Steel standard; 316 SS, Bronze, Iron available
Seal
Neoprene standard; Buna-N, Viton, PTFE available
Bi-directional and may be placed in any orientation. Used primarily in processes where spot indication is desired to detect presence of media, or to inspect color, clarity, turbidity, or other critical characteristics.
Sizes
1/8" – 2" FNPT
Pressure
150 Full ANSI Class (285 PSI @ -20 to 100°F, Carbon Steel)
Temperature
Up to 500°F (material dependent)
Flow Direction
Any direction (bi-directional)
Body
Carbon Steel standard; 316 SS, Bronze, Iron available
Seal
Neoprene standard; Buna-N, Viton, PTFE available
Low, intermittent flows are easily detected with this uni-directional style in the horizontal or vertically downwards direction. The drip tube forces the process to collect on the lower lip of the 316SS tube, allowing it to visibly drip downward.
Sizes
1/8" – 2" FNPT
Pressure
150 Full ANSI Class (285 PSI @ -20 to 100°F, Carbon Steel)
Temperature
Up to 500°F (material dependent)
Flow Direction
Horizontal or vertically downward (uni-directional)
Body
Carbon Steel standard; 316 SS available
Seal
Neoprene standard; Buna-N, Viton, PTFE available
The TFE rotor allows for easy bi-directional, multi-orientational flow direction. The speed of the rotor indicates the relative velocity of the media. Ideal for opaque liquids or heavy gases for an easily contrasting detection at far viewing distances.
Sizes
1/8" – 2" FNPT
Pressure
150 Full ANSI Class (285 PSI @ -20 to 100°F, Carbon Steel)
Temperature
Up to 500°F (material dependent)
Flow Direction
Any direction (bi-directional, multi-orientational)
Body
Carbon Steel standard; 316 SS available
Seal
Neoprene standard; Buna-N, Viton, PTFE available
The TFE flutter allows for easy uni-directional indication of low flowing gases and liquids. The thin ribbon type flutter curls into the pipeline, vibrating at the slightest presence of gas or liquid movement. The flow of the media is indicated by the intensity of the fluttering against the window.
Sizes
1/8" – 2" FNPT
Pressure
150 Full ANSI Class (285 PSI @ -20 to 100°F, Carbon Steel)
Temperature
Up to 500°F (material dependent)
Flow Direction
Uni-directional (low flowing gases and liquids)
Body
Carbon Steel standard; 316 SS available
Seal
Neoprene standard; Buna-N, Viton, PTFE available
ANSI 150# Pressure-Temperature Ratings
| Temperature | Carbon Steel | 316 SS | Bronze | Iron |
|---|---|---|---|---|
| -20 to 100°F | 285 psi | 275 psi | 225 psi | 200 psi |
| 150°F | 270 psi | 260 psi | 225 psi | 200 psi |
| 200°F | 260 psi | 240 psi | 210 psi | 190 psi |
| 250°F | 245 psi | 230 psi | 195 psi | 175 psi |
| 300°F | 230 psi | 215 psi | 180 psi | 165 psi |
| 350°F | 215 psi | 205 psi | 165 psi | 150 psi |
| 400°F | 200 psi | 195 psi | 150 psi | 140 psi |
| 450°F | 185 psi | 180 psi | N/R | N/R |
| 500°F | 170 psi | 170 psi | N/R | N/R |
N/R = Not Recommended. Connections per ANSI B2.1. All units hydrotested at 1-1/2 times rated pressure.
Nominal Rated vs. ANSI Rated — Key Differences
| Aspect | Nominal Rated | ANSI Rated |
|---|---|---|
| Pressure Rating Basis | 150 PSI WOG at ambient temperature | ANSI 150# P-T rating curve (285 PSI @ 100°F, decreasing with temperature) |
| Temperature Range | Up to 300°F standard | Up to 500°F+ (material dependent) |
| Code Compliance | General service, no specific code | Meets ANSI B16.5 pressure-temperature requirements |
| Body Construction | Standard wall thickness | Heavier wall, code-compliant construction |
| Gaskets/Seals | Elastomeric seals standard | Spiral wound metallic gaskets standard |
| Typical Use | General industrial, HVAC, utilities | Steam, high-temp process, code-required installations |
Jacoby Tarbox ANSI-rated sight flow indicator sales
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