Kidde Fire Systems Surge Protector P/N 81-CO2MAN-001 Manuale Utente

P/N 81-CO2MAN-001

3-73

September 2013

As an alternative to the above limits for the 108 cu. in. nitrogen cylinder, the 1040 cu. in. 

nitrogen cylinder may also be used for direct operation of CO2 cylinders and stop valves. The 

1040 cu. in. nitrogen cylinder cannot be used to drive the nitrogen operated discharge delay 

unit. Therefore, the 1040 cu. in. nitrogen cylinder may be employed upstream of a 108 cu. in. 

nitrogen cylinder or downstream of the discharge delay unit. A maximum actuation line length 

of 460-ft is allowed between the 1040 cu. in. nitrogen cylinder and all of the downstream 

pressure operated control heads. Either schedule 80 stainless steel pipe or 5/16" x 0.032 wall 

stainless steel tubing may be used for the entire actuation line. Also in this arrangement, the 

1040 cu. in. nitrogen cylinder assembly can actuate up to three additional nitrogen cylinders, 

which will be used to drive nitrogen pressure operated sirens. When actuating siren driver 

cylinders, a maximum actuation line length of 90-ft is allowed. This length is in addition to the 

460-ft maximum allowed length between the pilot cylinder and the discharge delay. When the 

length between the pilot cylinder and discharge delay is less than 460-ft, the resulting 

difference may be added to the 90-ft actuation line length to the siren driver cylinders.

3-13.4.5.2 Nitrogen Actuation with In-Line Discharge Delay

When using a nitrogen operated discharge delay unit, the 108 cu. in. nitrogen cylinder 

assembly shall be used to supply nitrogen to the delay unit. Either ¼" schedule 80 stainless 

steel pipe or 5/16" x 0.032 wall stainless steel tubing may be used for the entire actuation line. 

No more than 4-ft of actuation line length can be used to connect the nitrogen cylinder to the 

discharge delay unit. A maximum actuation line length of 225-ft may be used from the outlet 

of the discharge delay to all of the downstream pressure operated control heads. Also in this 

arrangement, the 108 cu. in. nitrogen cylinder assembly can actuate up to a pair of additional 

nitrogen cylinders, which will be used to drive the nitrogen pressure operated siren. When 

actuating siren driver cylinders, a maximum actuation line length of 20-ft is allowed. This 

length is in addition to the 4-ft maximum allowed length between the pilot cylinder and the 

discharge delay. When the length between the pilot cylinder and discharge delay is less than 

4-ft, the resulting difference may be added to the 20-ft actuation line length to the siren driver 

cylinders. Refer to Figure 3-12 for a typical acuation arrangement utilizing an in-line discharge 

delay.

Table 3-13. Nitrogen Pilot Line Length Limitations

1/4-inch (DN6) NPT Schedule 40

Galvanized Steel Pipe

300 ft. (91.44 m)

1/4-inch (DN6) NPT Schedule 80

Galvanized Steel Pipe

436 ft. (132.89 m)

1/4-inch (4mm) OD x 0.035 in. (1mm)
Wall Thickness Stainless Steel Tubing

427 ft. (130.14 m)

5/16 in. OD x 0.032 wall

436 ft. (132.89 m)