BEAMA Indices|List of Indices & Formulae

List of Indices & Formulae

List of Indices

Indices

Labour Indices

  • BEAMA Electrical Labour Cost Index (BEL)
  • BEAMA Mechanical Labour Cost Index (BML)

Material Indices

  • BEAMA Basic Electrical Equipment Cost Index (BEE)
  • BEAMA Mechanical Engineering Cost Index (BMM)
  • BEAMA Factory Built Assemblies Cost Index(BFB)
  • BEAMA Distribution Transformer Cost Index (BDT)
  • BEAMA Industrial Electronic Cost Index(BIE)
  • BEAMA Large Power Transformer Index(BLT)
  • BEAMA Basic Iron & Steel Cost Index(BIS)
  • BEAMA Composite Index (BCI)
  • BEAMA Basic Iron & Steel Producers Cost Index(BIP)

Notations

  • \(P_0 \)  Initial Contract Price (FOB price for export contracts
  • \(P_n \)  Final Contract Price (FOB price for export contracts
  • \(I_0 \)  Index value last published before date of Tender
  • \(I_n \)  Index value last published before the completion date
  • \(I_{mth:0} \)  Index (or Price) of \(I\) published in month in which Tender date falls
  • \(I_{mth:x} \)  Index (or Price) of \(I\) published \(x\) months after the date of Tender
  • \(I_{day:0}\)  Index (or Price) published on the same day as the date of Tender
  • \(I_{day:x}\)  Index (or Price) published \(x\) days after the date of Tender
  • \(I_{avg|t:x\rightarrow y} \)  Average of Index (or Price) \(I\), published between \(x\%\) and \(y\%\) of the contract period
  • \(I_{avg|mth:x,y,z} \)  Average of Index (or Price) \(I\), published for months of \(x ,y \) and \(z\) after the contract start date
  • \(I_{avg|mth:n-x,n-y,n-z}\) Average of index \(I\) published for months of \(x ,y \) and \(z\) before the completion date
  • \(I_{date:agreed} \)  Index (or Price) of \(I\) published on the \(date\) specified in advance by the Purchaser and \(agreed\) by the Contractor
  • \(I_{date:order} \)  Index (or Price) of \(I\) published on the \(date\) the Contractor places the \(order\) with the supplier

BEAMA Standard Formulae

    The equations below are the list of existing BEAMA Standard Formulae using the abbreviations in section A4 and notations in section A5.

  1. Electrical Machinery

    \(P_n = \frac{P_0}{100} \left(5 + 47.5\times \frac{{BEE}_{avg|t:40\rightarrow 80}}{{BEE}_0} +47.5\times \frac{{BEL}_{avg|t:33\rightarrow 100}}{{BEL}_0}\right)\)

  2. Mechanical Plant

    \(P_n = \frac{P_0}{100}\left(5 + 47.5\times \frac{BMM_{avg|t:40\rightarrow 80}}{BMM_0} +47.5\times \frac{BML_{avg|t:33\rightarrow 100}}{BML_0}\right) \)

  3. Industrial Electronic Equipment

    \(P_n = \frac{P_0}{100}\left(5 + 32\times \frac{BIE_{avg|t:40\rightarrow 80}}{BIE_0} +63\times \frac{BML_{avg|t:33\rightarrow 100}}{BML_0}\right) \)

  4. Rotating Electrical Machinery

    \(P_n = \frac{P_0}{100}\left(5 + 40\times \frac{BEE_{avg|t:58\rightarrow 75}}{BEE_0} +55\times \frac{BEL_{avg|t:58\rightarrow 100}}{BEL_0}\right) \)

  5. Distribution Transformers \(<\) 10 MVA

    \( P_n = \frac{P_0}{100}\left(5 + 35\times \frac{BEL_{mth:n-1}}{BEL_{mth:0}} + x\times \frac{BLT_{mth:n-2}}{BLT_{mth:0}}+ y\times \frac{{LMEcu}_{date:agreed}}{{LMEcu}_{day:0}}\right) \)
    \(x+y=60\)
    \(y\) is the proportion of the contract price at the date of tender wholly related to copper (i.e. the weight of copper multiplied by the cost per kilo of copper at tender date, expressed as proportion of the contract price at date of tender. This proportion should be scaled down by \(60\%\) to preserve the material proportion of the formula.

  6. Distribution Transformers \(\geq\) 10 MVA

    \(P_n = \frac{P_0}{100}\left(5 +47.5\times \frac{BEL_{mth:n-1}}{BEL_{mth:0}} + x\times \frac{BLT_{mth:n-2}}{BLT_{mth:0}}+ y\times \frac{{LMEcu}_{date:agreed}}{{LMEcu}_{day:0}} + z\times \frac{{TDEoil}_n}{{TDEoil}_0} \right) \)
    \(x+y+z=47.5\)
    \(y\) is the proportion of the contract price at the date of tender wholly related to copper (the weight of copper multiplied by the cost per kilo of copper at tender date, expressed as proportion of the contract price at date of tender
    \(z\) is the proportion of the contract price at date of tender which is wholly related to insulating oil (i.e. the quantity of insulating oil multiplied by the cost per litre of insulating oil at tender date, expressed as a proportion of the contract price at date of tender

  7. Large Power Transformers

    \( P_n = \frac{P_0}{100}\Bigl( 5 +25\times \frac{BEL_{mth:n-1}}{BEL_{mth:0}} + 20\times \frac{BLT_{mth:n-2}}{BLT_0} +10\times \frac{BIS_{mth:n-2}}{BIS_0} + 15\times \frac{LMEcu_{ order|day:1} }{ LMEcu_{ day:0} } + 5\times \frac{ TDEoil_{n-2} }{ TDEoil_{mth:0-1} } + 20\times \frac{TDEgoes_{n-2}}{TDEgoes_{mth:0-1}} \Bigl)\)

  8. Turbo Generating & Allied Plant

    \(P_n = \frac{P_0}{100}\left(5 +47.5\times \frac{BEL_{avg|t:33\rightarrow 100}}{BEL_0} + 33.25\times \frac{BIS_{avg|t:40\rightarrow 80}}{BIS_0} + 14.25\times \frac{BMM_{avg|t:40\rightarrow 80}}{BMM_0} \right)\)

  9. Distribution Feeder Pillars

    \(P_n = \frac{P_0}{100} \left(5 + 56\times \frac{{BEL}_{mth:n-1}}{{BEL}_{mth:0-1}} + 39\times \frac{{BEE}_{mth:n-1}}{{BEE}_{mth:0-1}} \right)\)

  10. Switchgear \(\leq 36 kV\)

    \(P_n = \frac{P_0}{100}\left(5 + 45\times \frac{{BEL}_{mth:n-1}}{{BEL}_{mth:0}} +50\times \frac{{BEE}_{mth:n-1}}{{BEE}_{mth:0-1}}\right)\)

  11. Switchgear \(> 36 kV\)

    \( P_n = \frac{P_0}{100}\left(5 + 45\times \frac{{BEL}_{avg|mth:n-3,n-2,n-1}}{{BEL}_{mth:0}} +50\times \frac{{BEE}_{avg|mth:n-4,n-3}}{{BEE}_{mth:0}}\right) \)

  12. Factory Built Assemblies for Control Equipment

    \(P_n = \frac{P_0}{100}\left(5 +47.5\times \frac{{BEL}_{mth:n-1}}{{BEL}_{mth:0}} + 47.5\times \frac{BFB_{mth:n-1}}{BFB_{mth:0}} \right) \)

  13. Factory Built Assemblies for Low Voltage Switchgear

    \(P_n = \frac{P_0}{100}\left(5 +47.5\times \frac{{BEL}_{mth:n-1}}{{BEL}_{mth:0}} + 47.5\times \frac{BEE_{mth:n-1}}{BEE_{mth:0}} \right)\)

  14. Service and Maintenance (Electrical)

    \(P_n = \frac{P_0}{100}\left(5 + x\times \frac{{BEL}_{mth:n-1}}{{BEL}_{mth:0}} +y\times \frac{BEE_{mth:n-1}}{BEE_{mth:0}}\right)\)
    \(x + y = 95\)

  15. Service and Maintenance (Mechanical)

    \(P_n = \frac{P_0}{100}\left(5 + x\times \frac{{BML}_{mth:n-1}}{{BML}_{mth:0}} +y\times \frac{BMM_{mth:n-1}}{BMM_{mth:0}}\right)\)
    \(x + y = 95\)

  16. Electrical / Mechanical - Service

    \(P_n = \frac{P_0}{100} \left(5 + 23.75\times \frac{{BEE}_{n-1}}{BEE_{mth:0}} +23.75\times \frac{{BEL}_{mth:n-1}}{{BEL}_{mth:0}} + 23.75\times \frac{BMM_{mth:n-1}}{BMM_{mth:0}} +23.75\times \frac{BML_{mth:n-1}}{BML_{mth:0}}\right)\)

  17. Electrical / Mechanical - Non Service

    \(P_n = \frac{P_0}{100} \left(5 + 23.75\times \frac{{BEE}_{avg|t:40\rightarrow 80}}{{BEE}_0} +23.75\times \frac{{BEL}_{avg|t:33\rightarrow 100}}{{BEL}_0} + 23.75\times \frac{BMM_{avg|t:40\rightarrow 80}}{BMM_0} +23.75\times \frac{BML_{avg|t:33\rightarrow 100}}{BML_0}\right)\)