FINAL DRAFT UGANDA 
STANDARD  
  FDUS 898-1 
First Edition  
2011 -mm-dd 
 
 
 Reference number  
FDUS 898-1: 2011 
© UNBS 2011  
  
Polypropylene (PP) pipes  — Part 1 : Dimensions  
 FDUS 898-1: 2011 
ii © UNBS 2011 – All rights reserved  
 Compliance with this standard does not, of itself confer immunity from legal obligations  
A Uganda Standard does not purport to include all necessary provisions of a contract. Users are 
responsible for its co rrect application  
© UNBS 20 11  
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilised in any 
form or by any means, electronic or mechanical, including photocopying and microfilm, without prior written 
permission from UNBS.  
Requests for permission to reproduce this document should be addressed to  
The Executive Director  
Uganda National Bureau of Standards  
P.O. Box 6329  
Kampala  
Uganda  
Tel: 256 41 4 505 995  
Fax: 256 41 4 286 123  
E-mail: unbs@infocom.co.ug  
Web: www.unbs.go.ug  
 FDUS 898-1:2011 
© UNBS 2011 – All rights reserved  iii 
 Foreword  
Uganda National Bureau of Standards (UNBS) is a parastatal under the Ministry of Tourism, Trade and 
Industry established under Cap 327 , of the Laws of Uganda.  UNBS is mandated to co -ordina te the 
elaboration of standards and is  
(a) a member of International Organisation for Standardisation (ISO) and  
(b) a contact point for the WHO/FAO Codex Alimentarius Commission on Food Standards, and  
(c) the National Enquiry Point on TBT/SPS Agreements of the Worl d Trade Organisation (WTO).  
The work of preparing Uganda Standards is carried out through Technical Committees. A Technical 
Committee is established to deliberate on standards in a given field or area and consists of representatives of 
consumers, traders, academicians, manufacturers, government and other stakeholders.  
Draft Uganda Standards adopted by the Technical Committee are widely circulated to stakeholders and the 
general public for comments. The committee reviews the comments before recommending the draft standards 
for approval and declaration as Uganda Standards by the National Standards Council.  
The pressures given are gauge pressures, in bar.  
Committee membership  
The following organisations were represented on the Technical Committee for Building a nd civil engineering 
standards during the development of this standard:  
 Department of Geological Mines and Surveys  
 Gentex Entreprises Ltd  
 Makerere University  
 Ministry of Works and Transport  
 Multiple Industries Ltd  
 Uganda Institution of Professional Enginee rs 
 Uganda National Bureau of Standards  
 Uganda National Association of Plumbers  
 FINAL DRAFT UGANDA  STANDARD  FDUS 898-1: 2011 
 
© UNBS 2011 – All rights reserved  1 
 Polypropylene (PP) pipes  — Part 1 : Dimensions  
1 Scope  
This Final Draft Uganda S tandard specifies dimensions and tolerances for seamless pipes of circular cross 
section, made f rom homopolymer polypropylene (PP -H 100), block copolymer polypropylene (PP -B 80) or 
random copolymer polypropylene (PP -R 80), as specified in US 898-2. It covers all available types of 
polypropylene pipes for all possible applications.  
2 Normative referen ces 
The following referenced documents are indispensable for the application of this standard .  For dated 
references, only the edition cited applies. For undated references, the latest edition of the referenced 
document (including any amendments) applies.  
ISO 12162 , Thermoplastics materials for pipes and fittings for pressure applications — Classification,  
designation and overall service (design) coefficient (ISO 12162:  1995)  
ISO 161 -1, Thermoplastics pipes for the conveyance of fluids — Nominal outside dia meters and nominal 
pressures — Part 1: Metric series  
ISO 4065: 1996 , Thermoplastics pipes — Universal wall thickness table  
ISO 11922 -1, Thermoplastics pipes for the conveyance of fluids — Dimensions and tolerances — Part 1: 
Metric series   
US 898-2, Types 1, 2 and 3 polypropylene (PP) pipes — General quality requirements and testing  
3 Concepts  
3.1 Pipe series  
Dimensionless number related to the nominal outside diameter of a pipe and its wall thickness (designated by 
S).  
On the basis of this number, the wall  thickness is to be calculated as follows:  
1 2
Sds
 
where S is to be taken from Table 1 of ISO 4065.  
3.2 Standard dimension ratio  
The ratio of the outside diameter of a pipe to its wall thickness. It is calculated as follows:  
SDR = 2S + 1 = d/s FDUS 898-1: 2011 
2 © UNBS 2011 – All rights reserved  
 where S is to be taken from Table 1 of ISO 4065 . 
4 Material designation  
The material designation is based on the minimum  required strength, M RS (that is,  the resistance to internal 
hydrostatic pressure) in water at 20  °C for 50 years, as specified in I SO 12162 (cf. Table 1).  
Table 1  — Material designation  
Material  designation  MRS,  
in N/mm2 
PP-H 100 1) 10 
PP-B 80 2) 8 
PP-R 803) 8 
') Previous designation: PP -H (type 1).   
2) Previous designation: PP -B (type 2).   
3) Previous  designation:  PP-R (type 3).  
5 Safety factors  
Safety factors shall be specified in the appropriate product standards. Minimum values are given in table 2 as 
a function of the material. Since the impact strength of PP -H 100 decreases as the temperature increases, the 
safety facto rs have been specified accordingly.  
Table 2  — Safety factors, SF 
Type of material  Safety factor for a temperature, in ºC,  
from 10 to under 
40 from 40 to 60  above 60  
PP-H 100  1.6 1.4 1.25 
PP-B 80  
1.25 PP-R 80 
 
Values for allowable working pressure a re given in tables 6, 8 and 10, taking into account the safety factors 
specified in Table 2. Tables 7,9 and 11 include additional values which are based on constant safety factors of 
1.7 (for PP -H 100) or 1 .5 (for PP -B-80 and PP -R 80).  FDUS 898-1: 2011 
© UNBS 2011 – All rights reserved  3 
 6 Dimensions and de signation  
 
 
Figure 1 — Designation of a pipe made from PP –B 80, with an outside diameter, d, of 50mm and a wall 
thickness, s, of 2,9mm : Pipe US 898 -1-50x2.9 – PP-B 80  FDUS 898-1: 2011 
4 © UNBS 2011 – All rights reserved  
 
FDUS 898-1: 2011 
© UNBS 2011 – All rights reserved  5 
 
FDUS 898-1: 2011 
6 © UNBS 2011 – All rights reserved  
 
 FDUS 898-1: 2011 
© UNBS 2011 – All rights reserved  7 
 
 
 FDUS 898-1: 2011 
8 © UNBS 2011 – All rights reserved  
 
 FDUS 898-1: 2011 
© UNBS 2011 – All rights reserved  9 
 
FDUS 898-1: 2011 
10 © UNBS 2011 – All rights reserved  
 
 FDUS 898-1: 2011 
© UNBS 2011 – All rights reserved  11 
 
 FDUS 898-1: 2011 
12 © UNBS 2011 – All rights reserved  
 
 FDUS 898-1: 2011 
© UNBS 2011 – All rights reserved  13 
 7.2 Pipes conveying other fluids  
Pipes which come in contact with aqueo us fluids or fluids which are particularly hazardous are recommended 
to have a lower S or SDR number . 
8 Form supplied  
Pipes are to be supplied in specified lengths or coils, complying with the tolerances  specified in Table 12.  
Table 12  — Limit deviations f or nominal lengths  
Form (supplied)  Limit deviations  
Coils, unwound length  Actual length not less than 
nominal length  
Straight pipes  up to 12 m  ± 10 mm  
Specified lengths  over 12  m 
By agreement  
 
9 Marking  
Pipes conforming to this standard shall bear the  following information, marked indelibly at 1 m intervals:  
 ,   . Example .   
- manufacturer's identification  xyz   
- quality or inspection mark  RAL 
- material designation  PP-H 100  
- Standard number  US 898 -1/ US 898 -2 
- S or SDR value  S 5 
- outside diamet er x wall thickness 32 x 2,9  
- date of manufacture  040996  
- machine number  7 
This marking is only to be used for pipes which are not covered in other product standards or other technical 
rules.  
 
 FDUS 898-1: 2011 
14 © UNBS 2011 – All rights reserved  
 Annex  A 
(normative)  
 
Explanatory notes  
With regard to the sp ecifications for outside diameters, this standard conforms to ISO 161-1, with regard to the 
specifications for wall thickness, it conforms to ISO 4065, and with regard to tolerances on outside diameter, 
circularity and wall thickness, it conforms to ISO 11922-1. 
The pressure rating (PN) is no longer used for pipe designation in basic standards for plastics pipes. However, 
for the purpose of comparison, Table A.1 correlates the old PN values with the S  and SDR values.  
It should be noted that the pipe outside  diameters were selected from a preferred number series.  
The service life of polypropylene pipes at operating temperatures of up to 50 ºC, previously given as fifty 
years, may now be assumed to be at least one hundred years.  
The nominal  sizes and allowable  working pressure to be used in particular applications will have to be 
included in the appropriate product standards or other applicable technical rules.    
According to current knowledge of the long -term stability of polypropylene it can be assumed that p ipes 
conveying water are capable of resisting the pressures given in tables 6 to 11.  
Where fluids are to be conveyed which could be hazardous if handled incorrectly, the pipe manufacturer 
should be consulted . 
 FDUS 898-1: 2011 
© UNBS 2011 – All rights reserved  15 
 Certification marking  
Products that conform t o Uganda standards may be marked with Uganda National Bureau of Standards 
(UNBS) Certification Mark shown in the figure below.  
The use of the UNBS Certification Mark is governed by the Standards Act, and the Regulations made 
thereunder. This mark can be u sed only by those licensed under the certification mark scheme operated by 
the Uganda National Bureau of Standards and in conjunction with the relevant Uganda Standard. The 
presence of this mark on a product or in relation to a product is an assurance that  the goods comply with the 
requirements of that standard under a system of supervision, control and testing in accordance with the 
certification mark scheme of the Uganda National Bureau of Standards. UNBS marked products are 
continually checked by UNBS fo r conformity to that standard.  
Further particulars of the terms and conditions of licensing may be obtained from the Director, Uganda 
National Bureau of Standards.  
 
 FDUS 898-1: 2011   
 
ICS nn.nnn.nn  
Price based on nn pages  
© UNBS 2011 – All rights reserved