1、BRITISH STANDARD BS7562-6: 1992 Planning, design and installation of irrigation schemes Part 6: Guide for feasibility and implementation proceduresBS7562-6:1992 This British Standard, having been prepared under the directionof the Agricultural Machinery and Implements Standards Policy Committee, was
2、published under the authorityof the Standards Boardand comes into effect on 15 July1992 BSI 08-1999 The following BSI references relate to the work on this standard: Committee reference AGE/30 Draft for comment87/71430 DC ISBN 0 580 20897 4 Committees responsible for this British Standard The prepar
3、ation of this British Standard was entrusted by the Agricultural Machinery and Implements Standards Policy Committee (AGE/-) to Technical Committee AGE/30, upon which the following bodies were represented: Agricultural Engineers Association British Agricultural and Garden Machinery Association Ltd.
4、Health and Safety Executive Ministry of Agriculture, Fisheries and Food National Farmers Union Silsoe College Silsoe Research Institute UK Irrigation Association Water Services Association of England and Wales Well Drillers Association Amendments issued since publication Amd. No. Date CommentsBS7562
5、-6:1992 BSI 08-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 References 1 3 Definitions 1 4 Proposals 1 5 Equipment supply, installation and commissioning 6 6 Roles of persons involved in proposals 7 List of references Inside back coverBS7562-6:1992 ii BSI 08
6、-1999 Foreword This Part of BS7562 has been prepared under the direction of the Agricultural Machinery and implements Standards Policy Committee and contains recommendations on good practice in the planning, design and installation of irrigation schemes in the UK, together with information and guida
7、nce. It is intended for the use of engineers and farmers having some knowledge of the subject. It embodies the experience of engineers successfully engaged in the design and construction of irrigation schemes so that other reasonably qualified engineers may use it as a basis for the design of simila
8、r irrigation schemes. A guide represents good practice at the time it is written and inevitably, technical developments may render parts of it obsolescent in time. It is the responsibility of engineers concerned with the design and construction of schemes to remain conversant with developments in go
9、od practice, which have taken place since publication of the guide. BS7562 has been prepared in six Parts as follows. Part1: Glossary of terms; Part2: Acquisition of site data 1) ; Part3: Irrigation water requirements 1) ; Part4: Water resources 1) ; Part5: Distribution systems and irrigation equipm
10、ent 1) ; Part6: Guide for feasibility and implementation procedures. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immun
11、ity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 to10, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the ame
12、ndment table on the inside front cover. 1) In preparation.BS7562-6:1992 BSI 08-1999 1 1 Scope This Part of BS7562 gives guidance on feasibility and implementation procedures. These procedures include various types of proposal and equipment supply, installation and commissioning. 2 References This Pa
13、rt of BS7562 incorporates, by reference, provisions from a specific edition of another publication. This normative reference is cited, at the appropriate point in the text and the publication is listed on the inside back cover. Subsequent amendments to, or revisions of, this publication apply to thi
14、s Part of BS7562 only when incorporated in it by updating or revision. 3 Definitions For the purposes of this Part of BS7562, the definitions given in BS7562-1:1992 apply. 4 Proposals 4.1 Estimates 4.1.1 Functions of estimates The function of an estimate is to provide a guide cost for the irrigation
15、 system proposed based on preliminary data and site considerations and initial discussions with the client. Often an estimate is presented verbally and discussed with alternative systems or variations within a system. The range of costs that may be incurred may vary with various major or minor chang
16、es to the indicated requirements, e.g.change of command area. An estimate may be used as a first guide for costs and economics prior to discussions with any authorities or bodies that may be involved, e.g.National Rivers Authority (NRA). An estimate is useful in exploring the requirements of the cus
17、tomer and much time in design and specification work may be saved by effective discussions at the estimating stage. An indication of supply and installation times required by the customer and the budget allocated may also be discussed. 4.1.2 Contents of estimates The contents of the estimate should
18、usually only include a guide cost with a simple qualification of the basis for the costs. The costs themselves may give either an overall price for the scheme or a breakdown for sections or alternatives within the estimate, such as the cost of different types of drive for pumps, or the difference in
19、 cost between above ground and underground supply mains. The technical basis upon which the estimate is based may simply state the area irrigated within the irrigation cycle and the amount of water to be applied. The system flow rate and water volumes are often estimated at this stage to check on av
20、ailable water sources, either flowing and/or storage requirements. Often the verbal estimate is given at the time of the first visit and discussion of the irrigation requirements. A simple diagram of the proposed system may be sketched out to illustrate the concept and layout considered and to provi
21、de a basis for discussions and clarification. 4.2 Quotations 4.2.1 Function of quotations The function of the quotation should be to provide an accurate cost of the irrigation system with a clear indication of the performance of the equipment. It should present the client with enough detail to enabl
22、e a budget for both capital costs and running costs to be worked and enable accurate calculations of water requirements and system operation programming through the season. It should summarize the equipment offered for the price and provide details of the equipment and system layout. 4.2.2 Contents
23、of quotations 4.2.2.1 General The contents of the quotation should include a covering letter, system description, basis of design and performance, the quotation, drawings, literature and the planned system layout. 4.2.2.2 Index The index, often on the title page should list the contents of the quota
24、tion so that any part of the offer can easily be located. 4.2.2.3 Covering letter The covering letter should include any particular aspects discussed and agreed. Both commercial and technical points may be recorded; or, if they are complex, a separate section may be appointed for this purpose. Point
25、s to be investigated further may also be referred to in the covering letter.BS7562-6:1992 2 BSI 08-1999 4.2.2.4 System description The system description should present clearly and succinctly the system proposed, not only describing the equipment but also explaining specific features incorporated wh
26、ich support the system and enhance its capabilities. Often within this section, reference is made to the design and specification and the client is requested to check the data used and to verify any factors and data that may have initially been assumed. 4.2.2.5 System basis of design and performance
27、 The system basis of design and performance should give clear details of the irrigation system proposed to provide the client with enough data to appreciate that the system will do the job for which it is designed. The basis of design should include data acquired from the site and used for the calcu
28、lations. These data may include area irrigated, climatic data, water source data, soils data, crop data, operation data and any other data critical in affecting the design and specification. The system performance should detail the performance of the equipment proposed including area irrigated per s
29、et and cycle, depth of water applied and the days per cycle, system flow rate, operating details of the equipment, such as application rate per hour and pressures. The pump duty calculations should list the losses and pressures required to operate the system and the requirements and outputs from the
30、 pump, e.g.power absorbed and nett positive suction head required. 4.2.2.6 Quotation The quotation provides the details of the capital costs incurred for the system proposed. It should give the total price for the system and detail any alternatives that may apply. Apart from the summary of the costs
31、, there may be breakdown details of the equipment specified. This information may be general, summarizing the equipment proposed in each section or it may list each. It is unlikely that item costs would be given in the quotation. Validity of the offer should be stated clearly on the quotation summar
32、y page. If a validity is not given, suitable explanation should be given or requested. Delivery time for the equipment supply and/or installation should be indicated, stating working weeks from the date of receipt and acceptance of the order by the supplier. The conditions of sale attached to the qu
33、otation, should be acceptable to the client. The conditions included should cover prices, cancellation, liabilities, delivery, subcontractors, warranty and additional clauses if the conditions of sale also cover installation. The terms of payment may depend upon the value of the quotation, whether t
34、he equipment is supply only or supply and installation, etc. 4.2.2.7 Assembly drawings Assembly drawings for a quotation may be general, showing typical assemblies for similar equipment to that quoted. The drawings should be representative of equipment offered so that the client has a clear indicati
35、on of the configurations proposed. Assembly drawings titles should correlate to the subheadings used within the quotation both in the quotation pricing and also the system description. Assembly drawings showing the relationship of the equipment proposed to the site situations should be used for clar
36、ifying general equipment installations. Typical assembly drawings provided may include pump units, suction and delivery fittings, supply mains and in-field equipment. 4.2.2.8 Literature The literature supplied with the quotation should provide details of the main items of equipment offered. The lite
37、rature should include not only general descriptions but also performance data, where applicable, such as performance graphs for pump units. The literature may be used for reference to performance of the system such as sprinkler charts. Literature may include details such as dimensions and weights bu
38、t this information is more detailed within installation and operation manuals. Literature may specify materials used for component construction and may give recommendations for suitable applications for the component. 4.2.2.9 Layout plan The layout plan should illustrate the irrigation system propos
39、ed so that the client understands the major implications of the design and specification. Site features which affect the design and layout should be indicated on the plan and the irrigation system itself should show both the installation and the operation of the equipment throughout the irrigation c
40、ycles.BS7562-6:1992 BSI 08-1999 3 If references within the quotation are made to the plan, such as hydrants or fields, similar references should be put on the plan. Layout plan sections may be used to illustrate where clarification of particular complex sections apply. 4.3 Tender 4.3.1 Functions of
41、tender The functions of the tender are to provide an accurate cost of the equipment specified and to clearly define the performance capabilities of the irrigation system offered. The tender should be sufficiently detailed so that tenders submitted by different companies, for the equipment required,
42、can be sensibly compared and evaluated. 4.3.2 Contents of tender The contents of the tender should cover all commercial and technical aspects that may relate to the supply and/or installation of the equipment. Generally, details within a tender are more comprehensive than in a quotation, making it e
43、asier for complete assessment and comparison. 4.3.2.1 General 4.3.2.2 Index The index should list the section within the tender giving the page locations. 4.3.2.3 Covering letter The covering letter is normally one of introduction to the offer made. Separate additional sections may cover aspects tha
44、t are critical within the tender but may have not been either clarified or agreed initially between the supplier and the customer. An explanation of any special additions or areas within the tender may also be explained within the letter. 4.3.2.4 Summary of offer The summary of offer should detail t
45、he complete costs incurred for the equipment and services proposed. The figures given should show the breakdown of costs per section and give separately the cost for installation, if applicable. Proposed alternatives and options should be included within the summary of offer. Equipment supply only t
46、enders may be either for ex-works delivery or delivery to site. Where supervision of installation or full installation is involved, the price should be complete for the job with clear details of requirements of services to be provided by both parties. The validity of the offer should be stated. The
47、delivery time for equipment supply and installation should be stated as working weeks from the date of acceptance of the order by the supplier. Certain statements may accompany the stated time for installation, especially those relating to site conditions, services and equipment. The conditions of s
48、ale should be acceptable, although minor points may need to be negotiated especially where installation of the equipment is involved. The conditions included should cover prices, cancellation, liabilities, delivery, subcontractors, warranty, etc., as applicable. The terms of payment may depend upon
49、the value of the order and whether the tender is for equipment supply only or supply and installation. The equipment may be delivered ex-works or delivered to site. 4.3.2.5 Bill of quantities The bill of quantities or list of materials specified should be comprehensive, covering a full list of all items proposed. The bill of quantities should list the quantities required per item, their cost, size and a short specification to clearly identify the item and relate it to the section where full data are supplied. The bill of quantities should be split into sections, su
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