6 replies to this topic

[roger.g]

We are writing from ICS, Senegal, West Africa.  We have 2 Boilers of 100 TPH capacity with 41 Bar Pressure rating.  1 Boiler is Water Tube Boiler and another one is Fire Tube Boiler.  We need to replace the Tube bundles of both the above Boilers.  Can any one suggest the thumb rule in costing and the difference in costing for both WT as well as FT Boiler.  Same MOC of Tubes, Tube Sheets can be assumed for both the Boilers.  MOC for Tube is SA 192 and for Tube sheet SA 516 Grade 70.  Thanks.  Roger / Purchase Engineer.

[breizh]

Good day Roger ,

Why don't you ask Vendors ? They will be more than happy to quote .

Breizh

Edited by breizh, 04 February 2013 - 09:19 PM.

[roger.g]

We need to check the quotes of the Vendor. Any Thumb rule to workout the costing.

[Art Montemayor]

If anyone were to try to trend the cost of boilers throughout the world, they would have to upgrade the estimates every year as a minimum.  Getting the accurate and realistic data from fabricators would be a struggle at the very least.  And how would the authors of this data receive payment for such information?  It not only isn't practical, it isn't happening.

 

With world economic scenarios fluctuating as they do on a daily basis and countries going almost bankrupt (Greece, Ireland, Italy, Spain, etc., etc.) it is impossible to obtain accurate data or data of any practical worth to predict costs.  It is far more practical and efficient to do what Breizh recommends.  Of course, vendors will only cooperate if you are honest with them and if you really have serious intentions and cash to purchase the boilers.

[kkala]

The boilers are supposed (at least 20 years) old to need replacement of (all) tubes, original vendors may no longer be available (or willing) for this task.  Willingness is not certain even from new boiler vendors, needing plenty of existing technical data just for a bid.  Capacity and steam pressure of FT boiler indicates range out of usual, <http://www.spiraxsar...ell-boilers.asp>;  on the other hand WT boiler is in usual range, yet relevant vendors tend to maximize activities at their work shop.
An alternative to boiler vendors is to call local specialized Contractors for bidding, considering the task as a heavy maintenance work.
Detailed instructions on how to dismantle the old and place the new tubes / bundles should be given, according to the documents of the two existing boilers. It may be worth while assessing this option with the Maintenance Dept; if they had replaced (not only plugged) boiler tubes in the past, it would be easier.
Post no 3 indicates bids received from at least one "Vendor' and a need to check quoted prices. A way out can be asking bids from additional Vendors. Then you can compare quoted prices of all bids on a weight basis, e.g. US$ per kg of tube or tube sheet. Vendors are normally requested to give weights as above (and breakdowns). These weights should practically not differ among Vendors / Contractors.
Anticipate that e.g. SA-192 price on tube bundle is higher than 1 US$/kg  met in Web, since the tube has to be cut, beveled, etc; and there shall be an additional charge for their installation, plus dismantling of existing bundles. As a general rule maintenance cost is composed of 50% materials - 50% labor, Maintenance Dept could advise specifically for the case. If above were realistic, resulting cost could be 1.0-1.5×2×2 =  4 - 6 US$/kg SA-192 (installed), yet multiple Vendors would give the real figure. Experts' comments on above  thinking would be also helpful.
Some 5 years ago (before economic crisis) structural steel was roughly priced here at 1€/kg (straight runs), or 2-2.3€/kg after cut and properly formed for use in road signs (including painting and screws). Installation cost varied widely, it could be another 15% (total 2.3-2.6€/kg); but the latter is generally higher in Plant maintenance. 

Edited by kkala, 07 February 2013 - 01:38 PM.

[esamali]

Can i get the price of fire tube boiler complete with spare parts.
Diesel oil fired steam boiler

Description:
boiler capacity 10 ton\hr

[Art Montemayor]

Esamali:

 

Do what Breizh advises:

 

"Why don't you ask Vendors ?  They will be more than happy to quote."