Method of selecting t∑↔§he flow ofstabilized pressure pu÷®→±mp
The pressure stabilizing pump is a ki§♠←λnd of fire pump, which is u§☆×sed to ensure the pressure of the ≤π←<water supply system of the active s♣←₹γprinkler system and the φ$fire hydrant is stab© →le, so that the water preσ≠↓ssure of the system is always at the§∏ ☆ required pressure. Once the wat♣¥er from the sprinkler‌×¥ or the fire hydrant comes out, the wa£≤♦ter volume and pressure required for sδ≠¥®atisfying the fire waφ₽§↕ter can be released. Altho φ∑£ugh both the pressure stabi™™‍lizing pump and booster pump ↓¶are pressurizing equipment, the βσ‌$pressure stabilizing pump ope®¶↔ rates when the nozzle☆‍≥  and fire hydrant have not f€ lowed out, and the booster pum©♥p operates when the nλ₽​​ozzle and fire hydrant have alrea₩σ®←dy flowed out of water, while the waφ ®ter pressure of fire water is ins§‌∑ ufficient, so it is necessary to add‍π↑σ water pressure.
The current code of China, γ$ Code for Fire Protection Design ↕✘₩∞of High rise Civil Bui©•♠ldings (GBJ50045-95) (herei•®nafter referred to as ±♣↔≠the "High rise Code"), has the fo↔♦÷"llowing rules for boos÷β✔≥ter equipment (includi​₽ng stabilized pressure pumps): "7.4∏¶®.8.1 The water output σ★ε÷of booster pumps should not be gre≥♣ater than 5L/s for the fire hydrantε♠& water supply system♠≈<≠ and 1L/s for the main sprinkler'φ★ system." This rule is conditional, onα<☆£e of which is that there is no∑​Ω pneumatic water tank∏₩α☆ in the fire water supply system; T✘£he second condition is th₹✘at the small leakage of the ind§→oor fire water supply system γ'is mainly at the sealing part of the ✔∏≤pump. The rules in t™₹₹his article do not mean that the stσ​abilized pressure pump shall be determεααined according to this flow under any c∞↓∏$onditions.
The booster pump referred t£εo in the High Speed R®♦egulation refers to both the booster≥™ pump used for pressurizatio↕δ♦★n and the stabilized pressure'$ pump used for pressureφε≥ stabilization. There is no differe€✔nce in the provisions of ₹↔the specification, but→‌β' in fact, the booster pump and the sφ'↓tabilized pressure pump a‍ ∑γre different in effec""t and function, and t☆€≤¥heir flow values are also different.
The booster pump used for noz Ωzles and fire hydran∑♦ts has already flowed out, λ§ but the water pressure of fire water × ÷is insufficient, so it is neces☆ε™sary to add water press$→ure to meet the wate↕♥ βr pressure demand of fire water. At tha↑σλ​t time, the flow of booster pump shall •™$ cover the flow of a sprinkler or a fir γ₩γe hydrant, that is, not less than 1L/✔♠β's or 5L/s. However, oα₽≥"nce the booster pump is started, ∏₽‌the main fire pump will also be start→₩ →ed subsequently. The effect of the ∏&✘ booster pump is not very urgen‌≤♣t and necessary.
The pressure stabilizing&​∞ε pump is different fr≈ §om the booster pump, which is β∞≥used to keep the self spraλ€ying system and fire hydrant sys™ ™tem under the require≤ d pressure working conditions. Once it ∞βflows out, it can meet the wat∑‍↑er pressure and water d$↓®∑emand required for fire water. ≥¶The effect is very significant, ®‌γ↑so the booster pump referred βλ™≠to in the specification essenti¥≤♣ally refers to the stabilized p♠₹♥ ressure pump, especially the stab♠&♦ ilized pressure pump of the act"∞<ive water spray rescue system
The flow value of the st♠π©"abilizedpressure pump depends on many factor≈↕​s, among which the most important o←←nes are:
(1) Type of system When tε↔βhe stabilized pressure pump λ→≠is used for the self spraying sys§'tem, consider the water volume of a sp↔®↑rinkler; When it is ↕✔♠™used in the fire hydrant system, c§↕onsider the water volume ↑♣↓δof a fire hydrant.
(2) The flow of the stab≈±ilized pressure pump shall be÷∏ calculated according to the water ¥±δαvolume of no more tha♥∑n one nozzle or one fireβφ∞ hydrant when there is no air pressure ‌®water tank. When there is a> ≈$n air pressure water tank, the water vo÷←lume compensation and pε ‍ressure assurance of th₩γ₩e system are implemented by the air pre≠↔ssure water tank. The flow § ₩of the stabilized pressure pump o• ★nly needs to meet the γ÷Ω®flow demand of the air pressure wat→←εer tank, that is, th₩±↕e flow of the stabiliz≤★™ed pressure pump should £σconsider the elementδ☆s of the conditioning volume of the <£air pressure water tank. At this mome≈₽nt, the flow of the stabilized pressure↑→← pump shall be calculated and ✘£&δdetermined according to the total v≥♠↓‍olume of air and water in the tank ÷£↓σof the pneumatic water supply equipmen×πt and the volume calculation f↔∑‍♠ormula of water in the ta>✘nk. The water output of t↓×≠he pump shall be no less than±♥ 1.2 times of the maximu™£m hourly flow of the  <pipe network when thβαe tank is under uniform pressureγ£.
There is no rule on the necessity ÷φ×of equipping a pneumatic waδ&  ter tank in the High λ≤> Level Regulation, but t₹₹←here is no pneumatic water ta☆ nk, and the stabilized pressure pump ↔ is frequently started, cau©¥δ∏sing simple damage; With the pneumatic δ✘water tank, the frequent"Ω♥ starting of the sta®♠bilized pressure pump c★ ♥an be alleviated, and the assurance♦₽ of the system's stabilized pressure w∞∑orking condition can be better ✔$☆performed. However, the cost o ∞★f adding air pressure water t¶ε≥ank is required. Generally, the ★"volume of the air pressure water t&©÷ank set up in a supporting manner ∏↑need not be too large, and the  ≤€volume should be less than 50L.
(3) System scale Qua♥↓'←si high pressure water supply sys↑↔₽∞temThe flow value of the stabilized(or stable high pressure water €&•supply system) with stabilized press∑​ure pump is available in indπ♣πoor, indoor and outdoor fields. α♥For the indoor quasi high γσ↑pressure water supply system×"↓£, steel pipes are used as pi¶$pes, and the joints are threaded  , flanged or welded. Th≈≠÷e leakage of the pipe network"‍↓ system mainly occurs at the sealing→♥ part of the pump, and the n$ umber is relatively limited. For t★•βεhe quasi high pressure water sφ₹upply system inside and outs£γ₹ide the room, because the outdoor pi↑σ&pe material is cast iron '₹∞pipe, the interface is socket type c≥δonnection, and the interface ♠♦£seal is rubber ring, the s$&→cale of the pipe network is large,‍→•← and the interface leakage accounts®δ for a proper proportion in the totaπ₩$l leakage. After the pipeline construct↕≥→ion, the soil shall be recovered immed♦±₹iately. Sometimes, the interface sh≈♦₽all be reinforced with mixed soil. Eve≠&©n if there is leakagγ✘e, it is difficult to take remedial≤®ε♣ measures. All these indicate that when≥↕₽♠ the quasi high pressure water supp₩α•♥ly system is selected in the chamber₽© meter, the flow of the s↕φtabilized pressure pump shλ‌‍♣ould be kept to the extent of saδφ₩±tisfaction.