The TYCO TY7251 is the pendent model of the K17-231 series, with a K 16.8 discharge coefficient and 3/4″ NPT thread, standard response and standard coverage, operated by a glass bulb 5 mm. It is designed for high-piled storage and high-density applications, in lieu of K 8.0 or K 11.2 standard spray sprinklers. Installed hanging below the pipe with the deflector facing down. For where the sprinkler sits in the whole system, see the complete guide to sprinkler systems in Saudi Arabia.
In short
- Model (SIN): TY7251 — Pendent.
- Discharge coefficient K 16.8, 3/4″ NPT connection.
- Glass bulb 5 mm, standard response.
- Temperature ratings in the datasheet: 68 / 93 / 141 °C.
- Maximum working pressure: 175 psi (12.1 bar).
- Series approvals: UL, C-UL, FM (upright only), NYC, EAC. The approval of each model, finish and rating is in the approvals table of datasheet TFP332.
- FM approval for this series is for the upright only; this pendent is UL and C-UL listed.
How this sprinkler works
The glass bulb contains a fluid that expands when exposed to heat. When the rated temperature is reached, the fluid expands enough to shatter the bulb, the sprinkler opens and the deflector spreads the water over the fire area.
Installed hanging below the pipe with the deflector facing down. Standard response is typically used for storage and industrial areas, per the project design.
Models in the series
| SIN | Orientation | K-factor | Thread |
|---|---|---|---|
| TY7151 | Upright | 16.8 | 3/4″ NPT |
| TY7251 — this model | Pendent | 16.8 | 3/4″ 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
- K 16.8 gives very high flow at lower pressure. The datasheet requires a minimum deflector-to-top-of-storage clearance of 18 in. (457 mm).
Technical data
| Item | Value |
|---|---|
| Model (SIN) | TY7251 |
| Orientation | Pendent |
| Discharge coefficient | K 16.8 gpm/psi½ (241.9 L/min/bar½) |
| Thread | 3/4″ NPT |
| Element and response | Glass bulb 5 mm — Standard Response |
| Coverage | Standard Coverage |
| Temperature ratings | 68 / 93 / 141 °C |
| Maximum working pressure | 175 psi (12.1 bar) |
| Installation torque | 10 – 20 lb-ft (13.4 – 26.8 N·m) |
| Wrench | W-Type 8 |
| Approvals | UL, C-UL, FM (upright only), NYC, EAC |
| Datasheet | TYCO TFP332 |
The critical point: clearance above storage
Keep at least 18 in. (457 mm) between the deflector and the top of storage, and tighten with the W-Type 8 wrench at 10 – 20 lb-ft.
Installation steps
- Inspect before installing: never install a sprinkler whose bulb is cracked or has lost liquid.
- Install the sprinkler in its correct orientation (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 8) within 10 – 20 lb-ft (13.4 – 26.8 N·m). Higher torque can distort the inlet and cause leakage.
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 TFP332 and the available approval certificates are in the files section of this page. When ordering, state the model TY7251, temperature rating and finish. 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 TY7251 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 TFP332 gives each model’s approvals by rating and finish, so check it when the project requires a specific approval.
References
- TYCO TFP332 — 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.
