XBC Series Diesel Engine Fire-Fighting Pump
XBC series diesel engine fire-fighting pump group is a new-style fire-fighting equipment ("quipment" thereafter) developed by this Co.in accordance with GB 6245-2006 《Fire pumps》and 《NEPA20 Installation of centrifugal fire-fighting pumps》etc. standards and, upon the fitted fire-fighting pumps (single-stage single-suction type and single-stage dual-suctiontype), canbedivided into XBC-HS, XBCIS and XBC-S three sub-series. The equipmenthas a wide range of pressure and temperature and can be used for almost every occasion necessary for fire-fighting.
The diesel engine fitted with the equipment is an excellent product domestic or imported, features good starting performance, strong overload capacity, compact structure, easy maintenance and use and high degree of automation. The equipment is really a fire-fighting one advanced and reliablein performance.
XBC series diesel engine fire-fighting/emergency pump group
Applicable for water supply for fire service and emergency water supply.
Agricultural diessel engine pump group
Agricultural diesel engine pump unit is generally composed of selfpriming pump. The self-priming pump is light moveable water pump. It has such advantages as small volume, light weight, excellent performance, convenient operation, reliabl e use, easy maintenance and wide applicable range. It can be widely used for agricul-tural irrigation and water supply in factory, mine,construction site and daily life.
1. When adopting triangle belt for transmission, the spindle of driving engine shall be parallel with pump shaft and the belt wheels shall be aligned. The central distance shall not be lower than twice of the diameter of the twobelt wheels. When the water pump is directly connected with the driving engine, they shall be equipped with same chassis.Adopt claw type flexible coupler and check the coupler part with steel rule to ensure the coaxiality of pump shaft and driving spindle.
2. Before the self-priming pump is started, water must be poured into the pump body to avoid influencing the self priming function. It is forbidden to operate without storing water to prevent the sealing parts being burnt. Before the centrifugal pump is started, first add water into the pump and start it until the water fills the inlet pipe and pump body.
Agricultural diessel engine pump group
Moveable diesel engine pump unit is commonly used in the fire and municipal water drainage pump unit for agricultural irrigation, warehouse and dock. For small type unit, manual pushing type can be adopted, and for larger unit,vehicle dragging type can be adopted.
Structrral characteristic and functions
The equipment takes X6135, 12V135, 4102, 4105, 6102etc. Series diesel engines as the power and these dieselengines (can be fitted with clutches) are combined with fire-fighting pumps through high elastic clutches to form thefire-fighting pump group, including diesel tank, radiation water tank, blower, bontrol screen (for the auto group) etc.
As the auto-control group, a separate diesel engine auto-control cabinet (programmable)carries out the system's automatic starting,putting into use, auto-switching (the motorpump group is swit ched to the diesel engine pump one orthediesel engine pump group to another group), auto-protection(warning and stopping protection for the diesel engine's over-speed, lower oil pressure, hogh water temperature, three times failures of starting, low voltage of accumulator etc.) etc. functions and also can be connected to fire-fighting centers of users or the autowarning device offire to get a remote moni-toring.
To ensure the group to normally working ambient temperature of below 5℃, it can be fitted with and AC220V cooling-water preheater.
The diesel engine fire-fighting pump group can be formed as an automatic fire-fighting water-supply system (see Fig.l) together with an electric pump one, pressure sta bilizing pump one etc. and the working process is introduced in"Diesel engine control system". The equipment can be jointly controlled with a fire-fighting center.
The mode of water inlet of a fire-fighting pump can be self-pouring and suction-up and, upon the requirement in the firefighting standard, the former is generally used. It needs to specially note in case of the need of the latter so as for this Co. To supply the automatic vacuum waterleading device, however, the dimensions of the pump group have to be changed somehow.
系统结构与原理 System structure and principle
Electric fire-fighting water-supply system is generally formed with a pressure stabilizing pump, electric pump (main pump) and automatic diesel enging pump (spare one) and its principle of work comes like this: usually the pipe-network's pressure keeps in between P 1 (low one)- P2(high one).The stabilizing pump starts once the pressure be lows P 1 and stops when it rises to P2. It lowers slowly from P2 to P 1 due to the leakage of the network, the stabilizing pump starts again to keep it in between P l-P2.When the water quantity being use is greatly increased, the said pump can not keep the pressure at P 1 and it quickly lowers to P3, the electric pump
starts and the pressure rises to Pw (well) to meet with the demand for firefighting water. In case of power-off or a failure with the electric pump,the pressure goes on lowering from P3 to P4, the diesel engine pump automatically starts to have it rise to Pw for water supply.The electric pump or diesel engine one has to be stopped through artificial judgement and, if the leakage from the pipenetwork is estimated much, it is necessary to increase pressure stabilizing tanks or make the pressure stabilizing pump normally opened so as to avoid frequedt starting.
Cooling mode of generator
The cooling system of the oil engine supplied by this Co is generally in a closed cycle and functions cooling in such a way as both generator's surface and radiating water take heat exchange with the airflow produced by its blower. Please make a note at order if requiring an opened cycle of cooling(i.e.cooling of the generator is carried out by way of a heat exchanger between the cooling water transported through a water pump and the cycling water inside of the diesel engine).
Selection of fuel tank
The oil tank used for the diesel engine of a power below 52kW can be directly mounted on the unit while the one for the diesel engine of a power over 52kW can be separated from the unit.The following listed oil tank's volumes can ensure the diesel engine fire-fighting pump groups of different powers to normally work under the rated working condition for 8 hours.
95 Series small capacity diesel fuel tanks installed in the unit directly,the 135 series diesel engine fuel tank can be custom-tailored into the form of the following functions:
1．To ensure a fresh air inside of the machine room，it is necessary to prevent lots of heat from radiating inside and lower the noise．wrap the exhaust pipe of the diesel engine with asbestos，extend it outdoor and mount a rain-proof device on it or mount it 30° downward and a silenser. The number of the elbow on it should be as less as possibe and the bent radius of the elbow should be over 2.5 times the outer diameter of the exhause pipe．take it into consideration for the support of the pipe to lower vib ration and prevent its weight from loading on the diesel engine．
2．When to mount both inlet and outlet pipes ofthe fire-fighting pump，do not let their weight loading on the pump SO as to prevent it against damage and its performance of running from being affected．The inlet pipe should be as short and straight as possible and，when it is as self-pourin9，it must be mounted upward tiltedly towards the pump to make sure no air exists inside of the pipe．A filter screen and flexible connector should be mounted on the inlet and flexible connector，check valve and gate vlave on the outlet．
3．It is not allowed to mount the control cabinet in the front ofthe diesel engine's radiator．otherwise the electric components inside of the cabinet would be affected and not work normally and it should be mounted on both sides of the unit or close to it，so as to get a convenient operation．The wiring between both control cabinet and diesel engine should not be over 35m．
Star,stop and run of the equipment
1. Start: first make sure of the correct rorating direction of the fire fighting pump and the inlet valve is as N.O and outlet valve N.C. Before the pipe network starts with no water.A tier n o error is found, start the
fire-fighting pump and,when the pump gets stable run, gradually open the outlet valve and adjust it to the work condition point for the pump to run.The outlet valve is N.O.when the network is filled with water at usual.
2. Run:when the pump gets a normal run, check the shaft seal and the bearing to see how it works. The leakage for the mechanical seal should not be over 3 draops/min and for the stuffing seal should be dot drop. The beating's temperature should not be over 75℃, and its temperature rise not over 35℃, Stop running for a checking case of an abnormal sound during thepump's run.
3. To stop, first close the outlet valve, then the diesel engine.
1、根据消防规范要求，机组必须至少l 5天运行一次，运行时间不少于1 5分钟，以确保消防泵随时处于良好状态。
1. According to the requirement in the fire-fighting standard, the unit must run once at least every 15-day with time not less than 15minutes so as make sure of it in a good status at any time.
2. Every time to start the fire-fighting opump, it should be done to check if the shaft seal is normal and if it needs to be adjusted or replaced.
3. Periodically lubricate the bearing with grease.
4. Completely drain the water inside of the pump out in case of a long time stop of the opump to prevent the pump casing etc.Parts from being frozen to result in split due to extra low ambient temperature.
5. According to the provision for the maintenance of the diesel engine, daily maintenance should be kept for it by checking if the cooling water quantity, engine oil quaqntity, the accumulator's voltage, oil pressure meter, thermometer, speed-ometer and other control devices are normal.
故障原因及排除方法Causes to failures and recovery
a.Inlet and outlet valves not opened,inlet and outlet pipeli.ne blocked.or impeller channel blocked．
b.Improper turning direction of motor.low rotary speed due to phase absence of motor．
c.Air leakage of suction pipe.
d.Pump not filled up with liquid,and air existed inside pump chamber.
e.Insufficient water supply of inlet,overhigh suction head,or leakage of bottom valve．
f.Excessive pipeline resistance,or inappropriate selection of ump model.
a.Check and clear away obstruction．
a.Check it according to step l above．
a.First recover according to measures in step 1 above．
a.Operation beyond rated flow．
a．Adjust flow and lessen outlet valve．
a.Pipeline not steadily supported．
See"Diesel Engine Maintenance Manual"
See"Diesel Engine Maintenance Manual"
a.Mechanical seal damaged．
The type selecting gist
The basic gist of selecting a set of reasonable water-giving equipment is the design water flux and pressure, plus the change type of the using flux．
Continuum modal:There is seldom the situation of zero flux in a day or the normal leakage of the pipe-net own keeping afirmed flux, for instance, the bigsize hotel, restaurant, the adding pressure system for industrial and mineral enterprises etc．
Intermission modal:The time of using little water is quite long, even zero, for example,a small-size office building, a writing building, a commercial-residing building, all kinds of dwelling houses and producing water etc.Meanwhile, the flux change in a some time or for different seasons and the different water-using volume in the different regions should be taken in to consideration. Fire-fighting pump and spraying pump usually matched with diaphragm air-pressure tank, little flux stablepressure pump and electric control equipment firm a set of constant-pressure firefighting (spraying) water-giving equipme nts. Under the pressure-keeping situation for a long time, no flux change, no need of starting the main pump because air-com pressing water-giving equipment plus a little flux vice pump can compen-sate the pressure loss for the normal leakage, so the energy can be saved．
The advantages of the frequency conversion equipment：Giving water at a constant pressure，and adjustable constant pressure in a some range， the tolerance of the constant pressure is usually less than 0.02MPa, The frequency conversion speed adjustment is a highly efficient energy-saving method, which can save 20％ more than doing of the common air-co mpressing water-giving equipment, Moreover, the impacting current under starting of frequency conversion is small, also the running impact of the pump is small, so the noise is very small at a low speed．
The advantages of the air-compressing water-giving equipment: quite low making cost, easy-operation control system and convenient maintenance．
一、消防泵的选择The selection ofthe fire-fighting pump．
1、消防泵组供水高度的选择 The height of giving water for the fire-fighting group．
2、消防泵组流量的选择 Choice of group'S flow ofthe fire control pump
管路损耗参考表Reference Table of Pipeline Loss
XBC-HS Type diesel engine fire pump performance parameters