SANS 10120-3 LF-1983 Code of practice for use with standardized specifications for civil engineering construction and contract documents Part 3 Guidance for design Section LF Erf c.pdf

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1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA

2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any

3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. SARS 0120 : Part 3 Section LF-1983 Erf connections (water) PART 3 : GUIDANCE FOR DESIGN SECTION LF CONTENTS Clause Page Number PRE-TENDER CONSIDERATIONS

4、I Investigations l . Access to properties 1 Meters . i Administration 1 Access 1 Tenders . 1 Dociimentation 1 Project specification clauses and scheduling . 1 Pipes for erf connections . 1 Metcrs 1 DESIGN REQUIREMENTS . 1 General Projects . 1 . . Polyethylene pipes 1 Advantages of radiused erf conne

5、ctions . l Service connections for major consumers 2 Examples of erf connection layouts . 2 APPI, ICABILITY OF OTHER CODES . 2 TEST PROCEDURES 2 QUALITY CONTROL AND OTHER CONSIDERATIONS . 2 DRAWINGS Drawing LY.3.1 . Erf Connection : Typical General Arrangement . 3 Drawing LF.3.2 . Radiused Erf Conne

6、ction : Positioning of Ferrule . 4 Drawing LF.3.3 . Brf Connection to Single Property (Subeconomic) 5 Drawing LF.3.4 . Erf Connection shared by Two Properties (Subeconomic) 6 Drawing LF3.5 . Detajl of Typical Meter/St.op Tap Assembly (subeconomic) 7 June 1983 Approved by the COUNCIL OF TIIE SOUTtl A

7、FRICAN BUREAU OF STANDARDS SADS 0170 : Part 3 Section LP-19113 Erf connections (water) SABS l200 LF : ERF CONNECTTONS (WATER) NOTE: The clause number(s) given at the beginning or aftor the heading of a clause is/arc, unless otherwise stated, the number(s) of the relevant clause(s1 of SABS 1200 LF. P

8、HE-TENUER CONSIDERATIONS Access 1.0 Properties (Subclause 5.2.1). Where the stop tap and meter are to be installed, on private property, ascertain the name(s) of the owner(s) and the occupier(s) of each erf affected. Meters (Subclause 3.5). Ascertain whether the controlling authority has any standar

9、d or prcfercnce as to the type and make of meter to be installed. ADMINISTRATION Access. Under circumstances such as those described in 1.1.1 above, submit a list of occupiers and a suitable number of circular letters to the employer with a request that he obtain permission for a contractor to enter

10、 onto each erf to carry out the work. Draft the circular letters in such a manner that no diff.culties or delays will occur when the contractor delivers the notices reierred to in Subclause 5.2.1 of SABS 1200 LF. Tenders. Ensure that before the start of construction action has been taken in respect

11、of the applicable of the matters set out in Subclause 3.1 of Section 0. DOCUMENTATION Project Specification Clauses and Scheduling. See Section LF of Part 2 of the code. Pipes for Erf Connections (Subclauses 3.1 and 3.3). Where the contractor is not to be allowerl a free hand to select from the mate

12、rials specified in Subclause 3.1 of SABS 1200 LF, ensure that the schedule states clearly the material to be used for the pipes and fittings of erf connections. Where, lecause of the presence of corrosive soils or of risks of spillage in certain industries, more expensive materials are required, set

13、 out the requirements in the project specification (see Subclause 2.l(a) of Section LF of Part 2 of the code). Meters (Subclauses 3.2.2, 5.7.2, and 7.3). Except in the case of new townships, local and other authorities usually prefer to specify and/or supply meters of a make and type already in use

14、in other areas under their control, in order to simplify maintenance and reading pxocedures. Where this is the case a) take action as set out in Subclause 3.2.4 of Section A of Part 2 of the code; b) include in the project specification a clause that will relieve the contractor of responsibility in

15、terms of Subclauses 3.2.2 and 7.3.1 (but not 7.3.2) of SABS 1200 LP and that will suitably amend Subclause 0.2.4 of SABS 1200 LE. (See also Suhclause 2.2 of Section LF of Part 5 of the code.) C) Typically, in addition to providing the data required in terms of Subclause l.l(d) of Section LF of Part

16、2 of the code, a domestic meter (other than a digital display meter) may be specified as follows: Domestic meters shall be of the semi-positive type, shall have a rotary piston and a dry dial or a sealed liquid-filled head, shall be of a cyclometer pattern, and shall conform to the regulations gover

17、ning water meters published in terms of the Trade Metrology Act, 1973 (Acg 77 of 1973). The meters shall be suitable for operating with water at temperatures of up to 50 C and at working pressures of up to 1,0 MPa. DESIGN REQUIREMENTS GENERAL PROJECTS Polyethylene Pipes (Subclause 3.1.4). Polyet-hyl

18、ene pipes are flexible and, provided that the diameter does not exceed 50 mm, are suitable for house connecti.ons. Type 11 Class 12 polyethylene pipes with positive clamping metal couplings are frequently specified or scheduled but it is considerably more economical to use Type IV (i.e. high density

19、) pipes of the same class with polypropylene compression fittings. Note, however, that between Type 11 and Type IV pipes of the same nominal diameter there is a considerable difference in actual inside diameters. This affects the comparison of the costs of the piping and of the outlet ferrules. Adva

20、ntages of Radiused Erf Connections (Subclauses 5.2.2 and 5.2.3). Because an erf connection is a flexible pipe of relatively small bore, the small but rigid fitting that joins it to the supply main is liable to be damaged by careless handling or movement of the erf connection, or by settlement of the

21、 erf connection or the strata below it. Risk of such damage occurring is greatest if the erf connection is taken off at right angles to t.he main. The risk is reduced by the introduction of a long bend (of a radius that can readily be formed in the pipe) into the erf connection, as shown on Drawing

22、LP-3.2. Such a bend may be specified as an alternative or in additi.on to the 2 m of flexible pipe required in terms of Subclause 5.2.3.1 of SABS 1200 LF. Maintenance of reticulation systems necessitates the opening up of ferrule connections and, unless erf connections have been constructed to a reg

23、ular pattern, the location of the connections is unnecessarily time consuming. Therefore, where the use of radiused service connections has been adopted for any particular township, all such service connections should be constructed with bends of the same radius and with the flow in the same directi

24、on. Drawing LF-3.2 gives an example of such a standard layout. 1) See Regulation 80 of Part I1 published on page 171 of Govcrnment Gazette 5806 of 18 November 1977. SAES 0120 : Part 3 Section 13-1983 i:rf conttections (water) 2.1.3 Service Connections for Major Consumers (Subclauses 5.2.3 and 5.3).

25、The servrce connectrcins for schools, institutions, and major industrial consumers should be deslgned and constructrd as par of i he general retrrulatum system (or to the same standards li cc,nstructed subsequently) bccause a) the method of rndking a service connectien specifJed In SukJause 5.2.3 oC

26、 SABS 1200 Ii 1s no appropziate for connections of drameter exceeding about 50 mm; and h) the size of the valves and meters requrred for such a selvrct. connertion neuessltates the C(ISLIUCOI of a propexly deslgned valve chamber or manhole for their protection. 2.1.4 Examples; of Crf Connection Iayo

27、tts. Drawings LF-3.7 to LP-3.4, of whlcll one or more may hc mcludcd ltr 3 - contract, give typical srf connection layouts. Where other drawings are used, ensure that they give a) the minimum cover over the erf connection; 1,) the distances from erf boundaries; cl the depths of the dial of the meter

28、 or the top of each stop tap below the tops of the surfncc hoxes. Erf connections are subject to the relevant regulations issued in terms of the National Uuilding Regulations and Building Standards Act, 1977 (Act 103 of 1977). Reference may be made to Code of practice for the constr- of fibre-reinfo

29、rced cement pipeljnes2) for further details of potable water connections as specified in Subclause 5.2.3.2 cf SABS 1200 l. TEST PROCEDURES Tlte test procedures set out in Clause 7 of SABS l200 and of SAW 12UO LF are applicablr. QUALITY CONTROL AND OTHER CONSIDERATIONS Apply the relevant recommendati

30、ons of SAES 0157) to the design of erf conncct:,ons. 2) Published by the South African Fibre-reinforced Cement Manufacturers Association in September 1982. 3) Medium-pressure pipelines. 4) Qual rty management systems. (500 FROM SIDE BOUNDARY) AUTHORITYS METER BOX : OCCUPIERS VALVE BOX : CAST IRON TY

31、PE IOA TO TYPE IIA TO SABS 558) SABS 5585)0R CONCRETE OR ASBESTOS CEMENT MAX.DEPTH TO TOP OF STOP TAPS TO BE 75 mm BELOW COVER 1N.COVER TO ERF CONNECTION : 500 15 OR 20 mm 0 COPPER ERF CONNECT TO SABS 460 6, (ALTERNATIVELY POLYETHYLENE TYPE 2 OR 4 CLASS 12 TO SABS 533 ), AS SCHEDULED NOTE a) Where p

32、ossible. subject to municipal by-laws, a meter box WATER MAIN I should be located outside the DroDertv boundarv. S b) See Subclause 2.1 4. Dimensions in millimetres CONNECTION TO MAIN VIA SCREW- IN FERRULE AND SADDLE OR PLUG-IN Drawing LF - 3.1 - Erf Connection: Typical General Arrangement 5) Cast i

33、ron surface boxes and manhole and inspection covers and frames. 6) Copper and copper alloy tubing. 7) Black polyethylene pipes for the conveyance of liquids SABS 0120 : Part 3 Section LF-1983 Esf connections (water) - X-X- WATER MAIN -3500 - 2 NOT E a) Depth ot erf connections to be 200 mm within er

34、f. b) See Subclause 2.1.4. Dimensions in millimetres Drawing LF - 3.3 - Erf Connection to Single Property (Subeconomic) SABS 0120 : Part 3 Section LF-1983 Erf connections (water) OOOZ NOTE : See Subclause 2.1.4. 200 TO BOUNDARY /I X 460mm X 26Omm X 28Omm HIGH AC OR CONCRETE METER BOX x TO ERF - Dimensions in millimetres COPPER / POLYETHYLENE CO NNECTl ON Drawing L F - 3.5 - Detail of Typical Meter /Stop Top Assembly (Subeconomic) r re TO WATER MAIN