The TYCO TY3281 is the institutional pendent model of the RAVEN Institutional series, with a K 5.6 discharge coefficient and 1/2″ NPT thread, quick response and institutional sprinkler, operated by a fusible link. It is designed for correctional, detention and mental health facilities, and other commercial buildings. Installed pendent, with a tamper-resistant design. For where the sprinkler sits in the whole system, see the complete guide to sprinkler systems in Saudi Arabia.
In short
- Model (SIN): TY3281 — Institutional Pendent.
- Discharge coefficient K 5.6, 1/2″ NPT connection.
- Fusible link, quick response.
- Temperature ratings in the datasheet: 74°C.
- Maximum working pressure: 175 psi (12.1 bar).
- Series approvals: UL, C-UL. The approval of each model, finish and rating is in the approvals table of datasheet TFP651.
- Standard coverage (light and ordinary hazard) — black ID dot.
How this sprinkler works
The fusible link is made of two halves joined by a thin layer of solder. When the rated temperature is reached the solder melts, the halves separate and the sprinkler opens to flow water.
Installed pendent, with a tamper-resistant design. Quick response means the thermal element reacts faster, so the sprinkler operates earlier than a standard-response sprinkler of the same rating.
Models in the series
| SIN | Orientation | K-factor | Thread |
|---|---|---|---|
| TY3281 — this model | Institutional Pendent | 5.6 | 1/2″ NPT |
| TY3282 | Institutional Pendent | 5.6 | 1/2″ NPT |
| TY3381 | Institutional Horizontal Sidewall | 5.6 | 1/2″ NPT |
| TY3382 | Institutional Horizontal Sidewall | 5.6 | 1/2″ NPT |
Links to the other models are in the “Similar models” table below. The choice of model comes from the hydraulic calculation, hazard classification and installation method in the project design.
Application notes
- A tamper-resistant design that helps prevent false activation and minimises parts and openings that objects could be tied to. The sprinkler is designed to operate if the inner link is removed manually, so a tampered sprinkler is never left inoperable.
Technical data
| Item | Value |
|---|---|
| Model (SIN) | TY3281 |
| Orientation | Institutional Pendent |
| Discharge coefficient | K 5.6 gpm/psi½ (80.6 L/min/bar½) |
| Thread | 1/2″ NPT |
| Element and response | Fusible link — Quick Response |
| Coverage | Institutional sprinkler |
| Temperature ratings | 74°C |
| Maximum working pressure | 175 psi (12.1 bar) |
| Installation torque | 7 – 14 lb-ft (9.5 – 19.0 N·m) |
| Wrench | W-Type 25 |
| Escutcheon | Only the escutcheons shown in the datasheet |
| Approvals | UL, C-UL |
| Datasheet | TYCO TFP651 |
The critical point: the specified escutcheon
Use only the escutcheons shown in the datasheet, tightening with the W-Type 25 wrench at 7 – 14 lb-ft so the escutcheon is held fast to the ceiling or wall.
Installation steps
- Install the sprinkler in its correct orientation (Institutional Pendent) as shown in the datasheet — never reversed.
- Apply pipe-thread sealant to the threads, then hand-tighten the sprinkler.
- Finish with the specified wrench (W-Type 25) within 7 – 14 lb-ft (9.5 – 19.0 N·m). Higher torque can distort the inlet and cause leakage.
- With an escutcheon, use only the specified one (Only the escutcheons shown in the datasheet) and never compensate for adjustment by changing the torque.
Common mistakes
- Installing a sprinkler that was dropped, struck or slipped by the wrench. The datasheet requires any such sprinkler to be replaced.
- Painting or coating sprinklers on site. Sprinklers must not be altered after leaving the factory; altered sprinklers are replaced.
- Hanging objects from sprinklers, or cleaning them with anything other than a gentle feather duster.
Maintenance
Sprinklers that leak or show visible corrosion must be replaced, as must sprinklers exposed to corrosive products of combustion that cannot be fully cleaned. The owner is responsible for inspection, testing and maintenance to NFPA 25 and the authority having jurisdiction, preferably by a qualified inspection service. Before closing a main control valve for maintenance, obtain permission from the proper authorities and notify everyone affected.
Files and ordering
TYCO datasheet TFP651 and the available approval certificates are in the files section of this page. When ordering, state the model TY3281, temperature rating and finish, escutcheon. The datasheet lists the part numbers (P/N) for each combination.
How to order
Use the “Build your order” section on this page: add every model and quantity, then send the whole order by email or WhatsApp. It reaches us as a tidy PDF request sheet and we contact you with the quotation.
FAQ
What does TY3281 mean?
It is TYCO’s Sprinkler Identification Number (SIN). It identifies the exact model — orientation, K-factor and thread. The sprinkler is ordered by this number together with temperature rating and finish.
How do I choose the temperature rating?
From the highest expected ceiling temperature and the rating classes in the project’s governing standard, within the ratings available for this model in the datasheet.
Do all models in the series carry the same approvals?
Not always. The approvals table in datasheet TFP651 gives each model’s approvals by rating and finish, so check it when the project requires a specific approval.
What is the benefit of quick response?
The thermal element reacts faster, so the sprinkler operates earlier and limits heat and smoke spread; standards require it in some occupancies such as light hazard.
References
- TYCO TFP651 — Series datasheet (attached)
- NFPA 13 — Standard for the Installation of Sprinkler Systems
- NFPA 25 — Inspection, Testing and Maintenance of Water-Based Fire Protection Systems
- TYCO TFP700 — Installer warning for handling and installing sprinklers
This page is general information to help with selection and ordering, taken from the attached TYCO datasheet. Final design is set by the project’s approved designer; the project specification, the consultant’s drawings and the latest datasheet revision govern.
