Water fire extinguishing of the shopping center

Contents

Contents

A. Explanatory note

1. General Data

2. Fire fighting measures

3. Internal fire extinguishing system from fire cranes

4. Internal automatic fire extinguishing system

5. Calculation of sprinkler network

B. Attachments

- No. 1 Main indicators on water supply and sewerage systems;

- No. 2 Specification for Water Supply and Drainage

B. Graphic part

1 General data. PT-

2 Plan of B2 system on the 1st floor of PT-

3 Plan of B2 system on the 2nd floor of PT-

4 Plan of B2 system on the 3rd floor of PT-

5 Diagram of B2 system of the 1st floor. Installation diagram of PT- sprinklers

under suspended ceiling

6 Diagram of B2 system of 2 floors. Attachment diagram of PT-

piping to slab

7 Diagram of B2 system 3 floors. PT-

8 Fire fighting pump plan. PT- piping diagram

fire fighting pump

Attached Documents

9 Specification of equipment, products and materials

on 4 sheets. PT. WITH

Fire extinguishing

A. Explanatory note

General Data

• In this section of the working project, the main issues of fire-fighting water supply of the commercial and office complex in Nyagan were developed. The following materials served as input for the development of the working project:

• architectural and construction part of the project;

• Water supply specification

Fire fighting measures

Internal fire extinguishing, according to Construction Norms and Regulations 2.04.0185 *, from fire cocks with an expense of 2х2.6 p/a.

In accordance with NPB 1102003, automatic sprinkler fire extinguishing is provided in the shopping center building. Sprinklers are installed in all rooms with the exception of bathrooms, storerooms of harvesting equipment, ventilation chambers, heat unit, pumping station and staircases.

Internal fire extinguishing system from fire cranes

The system of internal fire extinguishing is designed from pipes steel electrowelded with a diameter of 57х3.0 in accordance with GOST 1070491, and powered from a sprinkler system. After installation, paint the pipes with oil paint in two times.

Internal automatic fire extinguishing system

In accordance with NPB 882001 *, the building of the shopping center for the technological process belongs to 1 group of premises. According to Table 1 of NPB 882001 *, the reflux intensity is 0.08 l/s∙m2, with a calculated area of ​ ​ 120m2, the water flow rate will be 9.6 l/s.

Sprinkler, water-filled installation is equipped with sprinkler sprinklers SVN12 with a diameter of a conditional passage of 12 mm with installation of a socket down. Nominal temperature of thermal lock opening 680С.

Control units of sprinkler unit UUS100/1,2VVF.04.02 are installed in the fire fighting pump room. Control units use control and signal valves "Class." Operation time of the control unit is 10 seconds. To prevent false actuation signals, a delay chamber is installed in front of the pressure switch.

As an automatic water feeder, a make-up pump (jockey pump) is provided, connected to the fire water supply through an intermediate membrane tank with a capacity of 80 liters. The CHV Booster HydroPack 1 CHV 460 pump unit provides pressure in front of the 40.0 m control and alarm valve. The auxiliary water feeder is automatically disconnected when the main fire pumps are switched on.

The required head during fire extinguishing is created by CR644 pumps manufactured by Grundfos, 2 working and 1 standby.

In network of sprinkler fire extinguishing, pipes steel electrowelded Ø57x3.5 - 108х3.0 GOST 1070491 and also pipes steel water pipeline Ø15x2.5 - 32х2.8 GOST 326275 are used. Pipeline laying is provided with slope to drain devices. In the upper points of pipelines there is a pipeline with a valve for air discharge from the system.

In the room of the pump station for connection of the fire extinguishing unit to mobile fire fighting equipment there are pipelines with outward branch pipes equipped with connecting heads.

The system is emptied through fire cranes.

Calculation of sprinkler network

5.1. Initial data for calculation:

5.1.1. Room Group (Annex 1 NPB 882001 *) - 1

5.1.2. Irrigation intensity (Table 1 NPB 882001 *) - Jop = 0.08 l/s * sq m

5.1.3. Area protected by a single sprinkler (Table 1 NPB 882001 *) - Fop.comp. = 12 sq.m.

5.1.4. Design protected area (Table 1 NPB 882001 *) - Frach = 120 sq.m.

5.1.5. Fire extinguishing unit operation time (Table 1 NPB 882001 *) - 30 min

5.1.6. Distance between sprinklers (Table 1 NPB 882001 *), not more than 4 m

5.1.7. Distance from sprinkler to walls, not more than 1.2 m

5.1.8. The distance from the sprinkler to the floor (item 4.13. NPB 882001 *) is 0.08 m0.4 m

5.2. Calculation of water consumption by the plant:

5.2.1. Total required water flow rate (Q), l/s:

Q = Jor * Frass

Q = 0.08 * 120 = 9.6 (l/s)

5.2.2. Design quantity of simultaneously operating sprinklers (N), pcs:

N = Free/Short

N = 120/12 = 10 (pcs.)

5.3.Selection of sprinkler:

5.3.1. Required sprinkler capacity (qtor), l/s:

qtor > Jop * Fop.clock

where: Jop - irrigation intensity, l/s * m2;

Fop.comp area irrigated by sprinkler, sq.m.

qor = 0.08 * 12 = 0.96 (l/s)

5.3.2. Required head in front of sprinkler for its protection of standard area (Nor), m:

Hole = (Jop * Fop.acch) 2/Hole

Hole = (0.08 * 12) 2/0.47 = 1.96 (m)

5.3.3. The normal head upstream of the sprinkler (item 7 of Appendix 2 of NPB882001 *) is 5 m.

5.3.4. Water flow through sprinkler at design head, l/s

q = Kop * VHop (Item 6, Appendix 2 NPB882001 *)

q = 0.47 * V5 = 1.05 (l/s)

We accept for further calculations a sprinkler with a nominal diameter of 12 mm.

5.4. Hydraulic mains calculation (performed as per Fig.1)

5.4.1. Head losses in the ACS control unit are determined according to the diagram of pressure nominal losses for friction against water flow

Qkvs is a water consumption through KVS = 34.06 p/a

NKVs = 0.1 m

5.4.2. The total head for the plant operation will be:

Ngotl = Ndl. + Local + Ngeom. + Nkvs

where: Ndl. - head loss at design length (calculation is summarized in Table 1), m

Non-local - local pressure loss, m = 0.1 Ndl

Ngeom. - highest pipeline height = 15 m

Total required head:

NTl = 44,49+0,1∙44,49 + 15 + 0.1 = 64.04 m

5.5. Selection of fire pumps:

To create design head H = 64.04 m at water flow rate for automatic fire extinguishing 34.061 and extinguishing from fire cranes 5.2 l/s, we select two working pumps of type CR 6421 with the following parameters:

- flow rate 70.8 m cubic/h;

- pressure 38.1 m water

- power 11 kW.

автоматическое водяное пожаротушение в торговом центре.dwg