Page 39 - Subyek Teknik Mesin - Forsthoffers Best Practice Handbook for Rotating Machinery by William E Forsthoffer

Project Best Practices Be st Practice 1.8
Suggested vendor pre-bid meeting details are required to participate in the pre-bid meetings. Note:
end user ‘in-house’ specialists are required.
letter
2. Individual supplier meetings – individual meetings are held
with each supplier, using notes from previous meetings, to
The following are suggested letter contents. Comments for ensure equal supplier experience, scope and exceptions to
consideration are noted in bold. specifications.
Please be advised that you will be asked to attend a pre-bid
meeting at ____________ (Your or Contractor’s or Company . 3. Meeting duration – Anticipated to be 1–2 days per major
decision required) offices. equipment train, depending on machinery risk classification.
Note: this includes compressors, drivers and auxiliaries.
Please refer to the typical agenda below.
Note: If possible, the meeting should be held at the vendor’s
4. Typical pre-bid meeting activity – Technical details are
offices. This is advisable since more experienced specialists are
reviewed using agenda requirements, to ensure proven
immediately available to answer any questions that may arise. This
component experience (with impellers, diffusers, rotor
decision should also be influenced by the machinery risk classifi-
response, bearing, seal, and auxiliary system etc.), and to
cation. The higher the risk, the more important the vendor office
meeting is. scope compliance and acceptable exceptions to specifications.
The pre-bid meeting will take place approximately _______ Modifications are made, as necessary, to ensure that each
vendor is offering proven components within acceptable
design limits.
(2–4 weeks after receipt of bid and must be coordinated
with the project team . note this decision will also be influ- Manufacturing capabilities are confirmed and sub-suppliers
enced by the machinery risk class). for all major components and auxiliary systems are
Only technical details will be discussed. Please bring the identified, and their experience is confirmed for similar
component manufacture.
technical, un-priced proposal for the equipment that you will
quote (trains include compressor, gear (if applicable) turbine At the conclusion of the meeting, notes are reviewed and each
and auxiliary systems). Your representatives at the meeting vendor is instructed to submit a final priced proposal, in full ac-
must include an experienced application instrument engineer cordancewithmeetingnotesthatwillbeusedforthebidevaluation.
and any other personnel you require. Depending upon machinery risk classification, some additional
The meeting objective will be to qualify your bid technically, end user in-house and/or independent third party design checks
based on component experience, and to fully define scope of may be required. In addition, separate vendor and sub-supplier
supply and approve exceptions to specifications. If necessary, machining,handlingandshippingcapabilityauditsmayberequired.
the technical aspects for your equipment may change as a result
of the meeting discussions. In addition to our (contractor)
Typical compressor train pre-bid meeting
equipment specialist the end user specialist ________ (or other agenda
assigned engineer) will participate in these meetings. We em-
phasize that it is in your interest to bring the most qualified
personnel to the meeting, since this will be the only technical Please note that the following agenda will be followed for each
meeting prior to the final bid. of the compressor trains being offered. Note: 1–2 days will be
The following additional audits may be required as a result of required for the meeting to review all details based on unit risk
your bid details and the use of major sub-suppliers. classification.
____________ 1. Compressor experience review (vendor to include necessary
reference charts, tables etc.)
Casing experience and review of compressor layout drawing
Impeller experience (flow and head coefficient)
(The end user to identify sub-suppliers for manufacturing,
handling and shipping audits based on vendor bid details)
Individual impeller curve (location of rated point to
At the conclusion of the meeting, all details will be summarized impeller best efficiency point)
and you will be asked to submit your priced proposal, in accor- Impeller stress
dance with the technical details, scope of supply and approved Rotor response
exceptions to specifications agreed to in the meeting. Your pro- Stability analysis (if applicable)
posal will be required in ________ weeks after the meeting. Bearings – surface speed, load and experience
Thrust balance
(Normally 2 weeks but may be longer based on complexity of
Seals – surface speed, balance forces and experience
equipment offering and machinery risk classification.)
Surge control and process control system
The pre-bid meeting agenda is attached. 2. Steam turbine or motor experience review (vendor to
include necessary reference charts, tables, etc.)
Pre-bid procedure fact summary Turbine casing experience and review of layout drawing
Stage nozzle and blade experience (profile, velocity ratio,
BTU/stage)
The following is a brief summary of the salient procedure facts:
Blade attachment method and blade stresses
1. Required personnel experience – experienced rotating Campbell and Goodman diagram review
equipment specialists from contractor, supplier(s) and client Rotor response

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