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• Chapter 3 — System Design Page 3 -15 REV. 2 General Piping Requirements 1. Split piping and straight piping are both allowed on a PCL -300 and PCL -460 system. , MS EPER 2. PCL -600 systems must use split piping only, with SIDE OF TEE BULL no nozzle located before the split, and with a " " SPLIT PIPING (REQUIRED maximum of 14 flow points per side. 1/2 in. mini- ONPCL 00 SYSTE mum piping must be used up to the first split. 3. Maximum volume for 1/4 in. pipe between a nozzle and the preceding tee is 410 mis. 4. Maximum flow numbers for 1/4 in. pipe is 6. 5. Maximum number of elbows between a nozzle " and the preceding tee is 5. STRAIGHT PIPING 6. Maximum of 25 elbows are allowed in the total piping system. 7. Maximum difference in elevation between the tank 006191Po outlet and any nozzle, or the tank outlet and the highest or lowest horizontal pipe run, is 10 ft. (3.1 m). Figure 3 -18. 8. No traps are allowed in the piping network. Design Steps 9. Pipe lengths are measured from center to center of fittings. Step No. 1 Determine number of flow points required based on duct size, plenum size and type, and size of 10. The internal equivalent length volume of fittings all appliances. does not have to be considered as part of the total Step No. 2 Determine size and quantity of tanks required. pipe volume. q Y q Refer to the chart in "General Piping 11.When utilizing different size pipe in the system, the Requirements" to determine the maximum largest size must start first and the additional pipe amount of flow numbers allowed per each tank must decrease as it approaches the nozzle. size. 12. Elbow(s) or swivel adaptors located at the nozzles Step No. 3 Layout nozzles, piping diagram, and tank loca- do not have to be counted In the 25 elbow maxi- lion. Determine pipe lengths as accurate as mum requirement. possible. Make certain maximum number of elbows is not exceeded. Note: Tanks cannot 13. Reducing bushings are allowed when reducing to be manifotded together. Each tank must a smaller pipe size. have a separate piping network. Step No. 4 Add all the lengths of each pipe run and multi - 14. Additional piping requirements when protecting a range, wok, or a fryer: ply by the mis. /ft. listed in the Volume Chart. If the sum falls within the acceptable range noted • PCL -300 - Minimum of 300 ml and four (4) flow in general Piping Requirements, that pipe size numbers required in total system. Of that mini- mum, 239 ml and two (2) flow numbers must be is acceptable. If the calculated volume is too utilized at or before the range, wok, or fryer. large, recalculate the volume using the ml per foot of a smaller pipe size. Pipe sizes can be • PCL -460 — Minimum of 660 mi and ten (10) flow mixed but Rule No. 11 of the General Piping numbers required In total system. Of that mini- Requirements must be followed. mum, 180 ml and two (2) flow numbers must be Step No. 5 Check to make certain minimum volumes, maxi - utilized at or before the range, wok, or fryer. mum volumes and maximum volume allowed • PCL -600 — Minimum of 960 mi and fourteen (14) between first nozzle and last nozzle is not flow numbers required in total system. Of that exceeded (Tank Chart). Check each rule in minimum, 120 mi and 2 flow numbers must be "General Piping Requirement" to make certain utilized at or before the range, wok, or fryer. none have been exceeded. If any requirement is exceeded, change to a different pipe size and recalculate. ULEX 3830 PN551274(2) April 1, 2004