This document provides specifications for plum concrete and plum masonry for a project at Hindustan Petroleum Corporation Limited's Mumbai Refinery. It specifies that the proportion of plums used should not exceed 50% of the total volume, and the stones should be between 200-300mm in size with a minimum crushing strength of 100kg/sqcm. The stones must be hard, durable, and tough. Cement concrete with a 1:4:8 ratio is to be used to fill the interstices between plums. Plums are to be laid in layers using cement concrete as mortar. Scaffolding is required, and weep holes using HDPE pipes must be provided.

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Page 1 of 3
HINDUSTAN PETROLEUM CORPORATION LIMITED
MUMBAI REFINERY
DHT PROJECT – OSBL FACILITIES
TITLE : SPECIFICATIONS FOR PLUM CONCRETE & PLUM MASONARY
DOCUMENT NO. : 44LK- 5100-00/A.02/1125/A4
Rev No. Issue Date Pages Rev Description Prepared
By
Checked
By
Approved
By
A 25/10/2008 3 ISSUED FOR TENDER DK SSP MBR

2. Jacobs
Pages 2 of 3 Specification for Plum Concrete & Plum Masonary HPCL, Mumbai
Standard Specification 44LK5100
Doc.no.44LK-5100-00/A.02/1125/A4
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TABLE OF CONTENTS
1.0 PLUM CONCRETE & PLUM MASONRY

3. Jacobs
HPCL, Mumbai Specification for Plum Concrete & Plum Masonary Pages 3 of 3
44LK5100 Standard Specification
Doc.no.44LK-5100-00/A.02/1125/A4
d:backup dsmhatresmitahpcl-dhdtboiler areapdf docstandard specificationspecification for plum concrete & plum masonary_1125.doc
1.0 PLUM CONCRETE AND PLUM MASONRY:-
The proportion of plums should not exceed 50 per cent of total volume of plum concrete /plum
masonry. The stone size to be used for plum shall be between 200 to 300 mm. The stone shall
be basalt ,trap or any other approved locally available stone with minimum crushing strength of
100 kg/sq.cm obtained from quarries approved by Engineering -in-charge.
The stone shall be hard durable and tough .The length of stone shall not exceed 3 time its height.
it will be sufficient to make up the total volume with plums and fill all the interstices, which should
not be less than 150cm, with cement concrete. The cement concrete shall be in 1:4:8 (cement,
sand, coarse aggregate). The coarse aggregate shall be 25 mm down. The water cement ratio
shall be adjusted at site to maintain the flowability of concrete to fill all the interstices properly.
The plums are laid in layers using the cement concrete as mortar.
The plum shall be raised uniformly, and no part, at any time shall be raised more than 900 mm
above adjoining work.
Double scaffolding shall be provided for construction and piercing of walls for scaffolding shall not
be permitted. The contactor shall be responsible for any damage or injury resulting from poor
scaffolding.
All plum concrete/ plum masonry shall be maintained wet for at least 7 days
Weep holes shall be provided by HDPE pipes buried in plum masonry. The end of the weep holes
,on the filled up side, shall be covered by geo-membrane and filled by gravels of sizes 40 mm.
Form work shall be of ply wood or steel .