俄亥俄州朴次茅斯改善水系统

俄亥俄州朴次茅斯改善水系统

正在准备改进俄勒冈州朴次茅斯市政水厂系统的计划的工程师，向市长和市议会提交以下报告：

“经过仔细研究当地状况，我们坚信抽水站和进气口应该比目前更远的河流。我们曾希望找到一块具有足够面积和适当海拔的土地，以使原水从河中直接抽入大型沉降盆地，具有足够的海拔高度，以使水通过过滤器从那里引导并通过重力从过滤器进行到分布式储层中。分配储层具有足够的高程，以给分配系统中的电源带来所需的火压力。此计划最令人满意，因为水只能抽水一次。非常适合下一个最佳布置，即从河中将原始水泵泵入底部的盆地，该盆地具有低升力离心泵，最适合泵送泥泞的水。通过重力导致的水通过凝结的盆地和过滤器B虫，并带回抽水站，并用高值泵发动机泵入水库。因此，我们建议并制定了以下布局的计划和规格：泵站和进气的拟议地点是在毗邻的Basham Homestead物业上，毗邻Carlyle铺路砖公司在新波士顿和Sciotoville之间的工厂。此时，河道在北部或俄亥俄海岸附近。在河流的最低阶段，距离低水岸线只有很短的距离，声音显示水的深度约为13英尺。该计划考虑了一个36英寸的铸铁进气管，该管道将用铅填缝接头铺设。河端将在河底铺设，其外端长24英尺。 The shore end will terminate in a brick pump well. The entire intake line will be laid below datum, which will bring the water to the pumps under a head rather than suction lift. The intake pipe will terminate in a dry well built of brick. A water tight steel plate shell will encase the well from bottom to top and the intake pipe where it enters will pass through a lead caulked joint. The walls will be of brick and will be 28 inches thick. The well will have a bottom of concrete three feet thick reinforced with steel I beams. To the intake pipe inside the well will be attached a cast-iron header provided with four openings for the attachment of the suction pipes of four pumps; two to be installed at present and the others in the future as they arc required. The pump well will be in the west end of the pumping station. The limited space between the N. & W. railroad tracks and the Ohio river permits no choice of design in the pumping station building. Only one arrangement can be adopted. This necessitates a long and narrow building. With this handicap we have endeavored to design a building as neat and pleasing as possible in architectural effects. In order to place the engine deck above high water it was also necessary to raise the foundations above the ground higher than would have been done under ordinary conditions. The highest flood recorded occurred in 1884, when the river reached a stage of 66.25 on the Portsmouth gauge. This corresponds with El. 536.71 on the government gauge. We have therefore placed the water table of the building and the engine room deck at El. 538.00 government gauge, or 67.44 on the Portsmouth gauge. The foundations of the buildings will be built of concrete. The water table, door sills and window sills will be of cut stone, rock-faced. The walls will be of red brick. The whole of the interior, except the work shop, will be lined with white enameled brick from the floor to a height of 10 feet. Above this white impervious brick will be used. The floors will be of concrete supported on steel I beams resting on concrete or brick piers. Partitions will divide the interior of the building into an engine room, a boiler room, a work shop, a toilet room and shower bath. The west end of the building will be a semicircular alcove containing the steam turbines driving the centrifugal pumps. Below the engine deck there will be a pipe gallery carrying all the water and steam piping, none of which will be above the door A supply room for storing oil and other supplies is also provided. The roof will lie covered with reinforced concrete on which will be placed Spanish tile, with dull green finish. The chimney will be built of radical brick on concrete foundation. It will be 175 feet high and will have a flue 60 inches in diameter, The boiler room, engine room and pump well are provided with ample space for two additional pumping units, an ultimate capacity of 16,000,000 gallons of water per 24 hours. The pumping machinery will consist of two centrifugal pumps having a capacity of 3,000 gallons per minute each; two vertical direct acting triple expansion pumping engines of 4,000,000 gallons per daycapacity each, and two water tube boilers of 250 horsepower each, together with condensers, vacuum pumps, heaters, etc., the centrifugal pumps will be located in the bottom of the pump well. Each will be operated through a vertical shaft extending to the engine room deck by a condensing steam turbine attached direct to the upper end of the shaft. There will also be located in the pipe gallery a non-condensing steam turbine operating a centrifugal pump of 250 gallons per minute capacity to be used to keep the pump well sump clear of water. The floors of the different galleries and rooms will be drained to this sump. The large centrifugal pumps will force the raw water from the intake through a 30-inch standard cast-iron main to the subsidence basin located on the higher ground north of the highway. From this basin it will be led to gravity to the filtration plant. After filtering the water will be led back to the pumping station through a 30-inch cast-iron main to the 36-inch suction header. The triple expansion high dutypumps will then force it to the filtered water distributing reservoir on Basham’s Hill. The piping will all be so arranged with valves, connections. etc., that two additional units of each kind can be added without shutting down any part of the plant, even for a short time, and thus securing a plant ultimately capable of pumping 16,000,000 gallons per day. The filtration plant will be capable of filtering 8,000,000 gallons per 24 hours. The specifications for filtration plant are purposely made broad and general in order to invite the latest patented appliances to be tendered to the city. Bidders are to submit detailed working plans and specifications and guarantee, under bond, to produce filtered water as clear and acceptable from a sanitary standpoint as that produced by the filtration plant of the city of Cincinnati. The force main to conduct the filtered water to the distributing reservoir will be a standard cast-iron pipe line. It will be 30 inches in inside diameter from the pumping station to the reservoir and 24 inches from the reservoir to the city distribution system. With the static head available this main will deliver 16,000,000 gallons per 24 hours into the city mains, without undue velocity. The distributing reservoir will be located on Basham’s Hill, where a bench of sufficient area has been found to accommodate a reservoir of 7,500,000 gallons capacity at an elevation of 200 feet above the business section of the city. This reservoir will be constructed entirely of reinforced concrete. As filtered water propagates a species of Algae that in summer gives a fishy flavor to the water and as this species of Algae does not thrive in water from which the light is excluded, the reservoir plans include a roof of concrete supported on brickpiers. The design of the waterworks improvements and the plans and specifications submitted covering the same, call for the very best material and workmanship procurable, and the most recent and improved machinery and appliances. We are confident that if the recommendations and plans are carried out Portsmouth will have a waterworks second to none in every respect.”