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EPC Instrument Procurement Data Package: How to Prevent RFQ Delays, Wrong Specifications and Rework

Angebot anfordern

Introduction: The Procurement Problem Often Starts Before the RFQ

For an EPC project, buying an industrial instrument is rarely as simple as sending a model number and asking for a price.

A pressure transmitter may appear to be a standard item.

A flow meter may look like a standard DN100 instrument.

A radar level transmitter may only require the tank height and measuring range.

A temperature sensor may appear to be nothing more than a Pt100.

Yet experienced EPC procurement engineers know that apparently simple instrumentation can create significant problems later in the project.

The problem often starts before the supplier receives the RFQ.

If the procurement package is incomplete, suppliers make assumptions.

If suppliers make assumptions, quotations become difficult to compare.

If quotations cannot be compared technically, procurement may select the wrong configuration.

And if the wrong configuration reaches site, the problem moves from purchasing to engineering, construction and commissioning.

This is why a professional EPC instrument procurement data package should be designed before the RFQ is released.

The objective is not to make the RFQ unnecessarily complicated.

The objective is to make every important requirement visible.

A good procurement package should allow an instrumentation supplier to answer five questions quickly:

What exactly is required?
Where will the instrument be installed?
What process conditions will it see?
How will it connect to the control system?
What documents and commercial conditions are required?

Once these questions are clear, supplier comparison becomes much easier.

1. What Is an EPC Instrument Procurement Data Package?

An EPC instrument procurement data package is the collection of technical, commercial and project information used to obtain and evaluate instrumentation quotations.

Depending on project size, it may include:

instrument index;
instrument datasheets;
material specifications;
process conditions;
piping information;
electrical requirements;
control philosophy;
I/O requirements;
applicable standards;
approved manufacturer list;
inspection requirements;
documentation requirements;
delivery schedule;
packing requirements;
commercial terms;
technical deviation form.

For a large project, these documents may be managed by different engineering disciplines.

For a smaller project, one procurement engineer may manage most of the information.

The important point is that the supplier should receive enough information to select the correct product configuration without guessing.

FUGUI’s industrial instrumentation product portfolio can be used as a starting point for reviewing the main process measurement categories before preparing an RFQ.

2. The Four Layers of a Professional Instrument RFQ

A useful way to structure an instrumentation RFQ is to divide the information into four layers.

Layer 1 — Process

What does the instrument need to measure?

Layer 2 — Mechanical

How does the instrument connect to the process?

Layer 3 — Electrical and Control

How does the instrument communicate with the plant control system?

Layer 4 — Compliance and Commercial

What standards, documents, certifications and delivery conditions apply?

This structure prevents a common procurement mistake:

focusing heavily on the measurement range while ignoring the interfaces.

For example, two pressure transmitters may both measure 0–10 bar.

Technically, however, they may be completely different products because one has:

1/2 NPT connection;
4–20 mA;
HART;
316L wetted parts;
IP67;

while another has:

G1/2 connection;
0–10 V output;
no digital communication;
different wetted material;
different environmental rating.

The measurement range alone does not define the instrument.

3. Start With the Instrument Index

The instrument index is one of the most important documents in an EPC instrumentation package.

A typical instrument index may include:

Tag	Service	Instrument Type	Quantity	Area	Line/Equipment
PT-101	Pump discharge pressure	Pressure Transmitter	1	Process	P-101
FT-102	Cooling water flow	Flow Meter	1	Process	Line 100
LT-103	Storage tank level	Radar Level Transmitter	1	Tank Farm	T-103
TT-104	Process temperature	RTD	2	Process	HX-104

The instrument index gives procurement a project-level picture.

It also provides an important control mechanism.

If the EPC project contains 300 instruments, procurement can track:

RFQ status;
quotation status;
technical evaluation;
commercial evaluation;
purchase order;
manufacturing;
inspection;
shipment;
delivery.

Without a controlled instrument index, individual instruments can easily disappear into emails and spreadsheets.

4. Instrument Datasheets Are the Technical Core of the RFQ

The instrument datasheet contains the information required for technical selection.

For a pressure transmitter, the datasheet may include:

service;
medium;
pressure range;
design pressure;
operating pressure;
process temperature;
ambient temperature;
process connection;
wetted material;
output;
communication protocol;
power supply;
accuracy;
enclosure rating;
hazardous-area certification;
display;
mounting;
accessories.

For a flow meter, the requirements may be much more extensive.

FUGUI’s flow measurement solutions cover several industrial flow measurement technologies, which means the RFQ should identify the actual application rather than simply stating “flow meter required.”

A useful flow meter datasheet should include:

fluid;
normal flow;
minimum flow;
maximum flow;
operating pressure;
design pressure;
operating temperature;
design temperature;
density;
viscosity;
conductivity where applicable;
pipe size;
pipe material;
process connection;
flange standard;
pressure rating;
lining;
electrode or sensor material;
accuracy;
output;
communication;
power supply;
display;
installation conditions.

The more critical the application, the more important this information becomes.

5. Why Process Data Should Be Separated From Instrument Data

One of the most useful improvements an EPC procurement team can make is separating process conditions from instrument specifications.

For example:

Process requirement

Fluid: cooling water
Normal flow: 80 m³/h
Maximum flow: 120 m³/h
Pressure: 8 bar
Temperature: 45°C
Pipe size: DN100

Instrument requirement

Technology: electromagnetic
Accuracy: ±0.5%
Output: 4–20 mA + pulse
Communication: HART
Power supply: 24 VDC
Flange: PN16
Liner: PTFE
Electrode: 316L
Display: local

This separation helps the supplier understand what is fixed by the process and what is open for technical selection.

It also gives the EPC engineer a better basis for evaluating alternative manufacturers.

6. Fixed Requirements vs Vendor-Selected Requirements

Not every parameter should be locked by the EPC.

This is another area where RFQs often become unnecessarily restrictive.

A good specification distinguishes between:

Mandatory

The supplier must comply.

Examples:

4–20 mA output;
DN100 process connection;
PN16 flange;
minimum IP rating;
hazardous-area certification;
specified wetted material.

Preferred

The supplier should comply where possible.

Examples:

local display;
HART communication;
stainless-steel housing;
specific diagnostic functions.

Vendor standard

The supplier can propose its normal design.

Examples:

internal electronic architecture;
standard mounting hardware;
standard terminal configuration where compatible.

This classification increases competition without compromising the technical requirements.

7. How to Write an Instrumentation RFQ That Suppliers Can Actually Quote

A practical RFQ should answer the following.

Product

What instrument is required?

Application

Where will it be installed?

Quantity

How many units are required?

Process

What will it measure?

Mechanical

How will it connect?

Electrical

How will it interface?

Compliance

Which standards and certificates apply?

Commercial

When is it required and under what terms?

A simple RFQ structure can therefore be:

Project: ABC Chemical Plant
Tag: PT-101
Service: Reactor pressure measurement
Instrument: Pressure transmitter
Quantity: 4 pcs
Range: 0–16 bar(g)
Process Connection: 1/2 NPT
Output: 4–20 mA + HART
Power: 24 VDC
Wetted Parts: 316L
Process Temperature: 120°C
Area: Hazardous
Certification: Project-specified
Display: Required
Calibration: Factory calibration required
Documents: Datasheet, certificate, test report
Delivery: Required by [date]

This is much more useful than:

Please quote four pressure transmitters.

8. The Technical Deviation Table

The technical deviation table is one of the most valuable documents in an EPC procurement package.

Its purpose is simple:

Make differences visible.

A supplier should not be allowed to hide a deviation inside a quotation note.

A typical comparison may look like this:

Parameter	Project Requirement	Vendor Offer	Deviation
Range	0–16 bar	0–16 bar	None
Output	4–20 mA + HART	4–20 mA + HART	None
Process Connection	1/2 NPT	1/2 NPT	None
Wetted Material	316L	316L	None
Accuracy	≤0.1%	0.075%	Better
Display	Required	Included	None
Certification	Required	Offered	None
Delivery	10 weeks	8 weeks	Better

If there is a deviation, it should be clearly stated.

For example:

Project requirement: 316L diaphragm
Vendor offer: Hastelloy C276 diaphragm

The EPC engineer can then decide whether the deviation is acceptable.

Without this table, procurement may compare two quotations that appear identical but actually contain important differences.

9. Do Not Let “Equivalent” Become a Technical Black Box

The word “equivalent” appears frequently in industrial procurement.

It should always be followed by evidence.

If a supplier proposes an alternative instrument, ask for:

proposed manufacturer;
proposed model;
technical datasheet;
model code;
measurement principle;
accuracy;
range;
materials;
process connection;
output;
communication;
certification;
dimensions;
technical deviations.

A professional supplier should be able to explain exactly why the proposed instrument is suitable.

For example:

“Equivalent to the specified pressure transmitter.”

is weak.

A stronger statement is:

“Proposed alternative: [manufacturer/model]. The offered transmitter meets the specified 0–16 bar range, 4–20 mA/HART output, 1/2 NPT connection and required process temperature. Wetted material differs from the project specification and is identified as a technical deviation.”

Now the EPC team has something it can evaluate.

10. Approved Vendor Lists Need to Be Managed Carefully

Many EPC projects have an Approved Vendor List, or AVL.

The AVL may specify acceptable manufacturers for:

pressure transmitters;
flow meters;
level instruments;
temperature instruments;
control valves;
analyzers;
DCS;
PLC;
instrumentation accessories.

The procurement team should determine whether the requirement is:

Manufacturer mandatory

or:

Manufacturer preferred

or:

Approved manufacturer or approved equivalent

These are very different commercial situations.

If the project requires a specific manufacturer, procurement should not quietly substitute another brand simply because the alternative is cheaper.

If alternatives are allowed, the RFQ should clearly state the approval process.

This can prevent disputes between:

engineering;
procurement;
vendor;
consultant;
end user.

11. Pressure Transmitter Procurement: The Data That Actually Matters

A pressure transmitter RFQ should normally include:

pressure type;
measuring range;
static pressure;
overpressure;
process temperature;
ambient temperature;
process connection;
electrical connection;
wetted material;
output signal;
communication;
power supply;
accuracy;
display;
enclosure;
hazardous-area requirement;
mounting accessories.

FUGUI’s pressure measurement instruments provide a useful product reference for EPC engineers evaluating pressure and differential pressure measurement requirements.

The most important point is to avoid selecting the transmitter solely according to the measurement range.

The pressure range must be considered together with the actual process and installation conditions.

12. Flow Meter Procurement: Specify the Application, Not Just the Pipe Size

One of the most common flow meter RFQ mistakes is:

DN100 flow meter, please quote.

Pipe size is important.

It is not sufficient.

A supplier also needs to understand:

what is flowing;
how fast it flows;
pressure;
temperature;
density;
viscosity;
conductivity;
pipe material;
installation;
flange;
output;
accuracy;
power supply.

For water applications, electromagnetic flow meters may be suitable when the process conditions meet their operating principle.

For gases, different technologies may be required.

For steam, pressure and temperature compensation may become important depending on the measurement objective.

The EPC procurement package should therefore allow the supplier to select the correct technology where the project specification permits alternatives.

13. Level Instrument Procurement: Tank Data Is Essential

A level transmitter should not be specified only as:

Radar level transmitter, range 20 m.

The supplier should also receive information about the vessel.

For example:

tank height;
nozzle location;
nozzle diameter;
tank material;
process pressure;
process temperature;
medium;
density;
foam;
vapor;
agitator;
internal structures;
installation arrangement.

FUGUI’s level measurement instruments include radar and ultrasonic level measurement products.

The instrument should be evaluated against the actual tank geometry.

A technically capable radar transmitter can still be a poor choice for a particular installation if the mounting arrangement creates measurement problems.

14. Temperature Instrument Procurement Requires Assembly-Level Specification

A temperature RFQ should clarify whether the project is purchasing:

sensor only;
sensor + thermowell;
sensor + transmitter;
complete temperature assembly.

For an RTD:

element type;
resistance;
wire configuration;
accuracy class;
sheath diameter;
insertion length;
process connection;
thermowell;
material.

For a thermocouple:

thermocouple type;
sheath;
junction;
insertion length;
thermowell;
extension cable;
accuracy.

For the transmitter:

input;
output;
communication;
mounting;
isolation;
certification.

FUGUI’s temperature measurement products can be referenced when preparing a project temperature instrumentation package.

15. DCS Procurement Requires a Different Level of Detail

DCS spare parts are not ordinary field instruments.

For a DCS module, the RFQ should ideally contain:

DCS manufacturer;
system type;
system generation;
module part number;
module description;
quantity;
revision;
application;
I/O type;
terminal board;
base unit;
accessories;
required condition;
warranty;
testing requirement.

For example:

Yokogawa DCS input card

is not a sufficiently complete procurement description.

The full part number is normally much more useful.

FUGUI’s Yokogawa DCS spare parts section can be used to identify the appropriate product family before sending an RFQ.

For obsolete DCS modules, the procurement package should also state whether refurbished or tested surplus units are acceptable.

16. Documentation Requirements Should Be Written Into the RFQ

Documentation is often forgotten until after the purchase order is issued.

That is too late.

The RFQ should state the required documents before quotation.

Possible documents include:

product datasheet;
GA drawing;
dimensional drawing;
wiring diagram;
installation manual;
operation manual;
calibration certificate;
material certificate;
certificate of conformity;
hazardous-area certificate;
test report;
inspection report;
packing list;
country of origin;
warranty certificate.

Not every instrument needs every document.

The project should identify which documents are mandatory.

17. Inspection and Testing Requirements

For critical EPC projects, the procurement package may include inspection requirements.

Depending on the instrument, these may include:

visual inspection;
dimensional inspection;
nameplate verification;
calibration test;
pressure test;
functional test;
communication test;
output simulation;
certificate review.

The supplier should know these requirements before submitting a quotation.

Otherwise, an unexpected inspection requirement may appear after the purchase order and create additional cost or schedule problems.

18. Lead Time Should Be Divided Into Real Stages

“Delivery: 8 weeks” is not always enough.

A professional EPC procurement schedule may distinguish:

engineering approval;
manufacturing;
testing;
inspection;
documentation;
packing;
shipment.

For example:

Technical document submission: 2 weeks
Manufacturing: 6 weeks
Inspection: 1 week
Packing: 2 days
Shipment: according to destination

This provides a clearer understanding of the actual project schedule.

For MRO purchases, the situation is different.

The buyer may need:

Ex-stock availability + immediate shipment.

Therefore, suppliers should distinguish between:

Available from stock

and

Manufacturing lead time.

19. Commercial Evaluation Should Start Only After Technical Evaluation

This is a basic but important procurement principle.

Suppose three suppliers quote:

Supplier	Price	Technical Status
A	$1,000	Deviation
B	$1,150	Compliant
C	$980	Different configuration

Selecting the lowest price immediately does not produce a meaningful comparison.

First determine:

compliant;
compliant with clarification;
technical deviation;
unacceptable.

Then compare commercial terms among technically acceptable offers.

This is particularly important for instrumentation because a small configuration difference can significantly affect suitability.

FUGUI’s article on comparing instrumentation quotations provides additional context for this procurement process.

20. Total Procurement Cost Is More Than Unit Price

A professional EPC evaluation should consider:

Equipment price

Accessories

Engineering

Inspection

Documentation

Packing

Freight

Taxes / duties where applicable

Installation impact

Potential modification cost

Downtime risk

This is particularly relevant when comparing an original instrument against an alternative manufacturer.

A lower equipment price may become less attractive if the alternative requires:

adapter fittings;
rewiring;
programming;
new mounting hardware;
additional engineering;
extra commissioning.

The procurement team should therefore compare the complete supply scope.

21. Create a Vendor Bid Evaluation Matrix

A vendor bid evaluation matrix makes the procurement process much more transparent.

A basic structure could be:

Evaluation Area	Weight / Requirement	Vendor A	Vendor B	Vendor C
Technical compliance	Mandatory	Compliant	Deviation	Compliant
Process compatibility	Mandatory	Confirmed	Confirmed	Pending
Certification	Mandatory	Yes	Yes	No
Documentation	Required	Complete	Partial	Complete
Delivery	Project requirement	8 weeks	10 weeks	7 weeks
Warranty	Required	18 months	12 months	12 months
Commercial offer	Evaluation	Quoted	Quoted	Quoted

The exact evaluation methodology should follow the project’s procurement procedures.

The important point is that technical and commercial information should remain visible rather than being reduced to a single price number.

22. The Instrument Purchase Order Should Repeat Critical Technical Requirements

Once the supplier is selected, do not rely entirely on the original RFQ.

The purchase order should clearly identify:

manufacturer;
model;
configuration;
quantity;
tag;
technical specification;
approved deviations;
required documents;
delivery;
inspection;
packing;
warranty.

If the supplier’s quotation contains an approved deviation, that deviation should also appear in the final purchase documentation.

This creates traceability.

23. Receiving Inspection: The Procurement Process Does Not End at Delivery

When the instruments arrive at site or warehouse, receiving inspection should confirm:

Physical

correct quantity;
correct model;
correct nameplate;
no transport damage;
correct accessories.

Technical

model code;
range;
process connection;
electrical configuration;
certification.

Documentation

datasheet;
certificates;
calibration;
manuals;
test reports.

A common mistake is checking only the carton label.

The actual instrument nameplate should be checked against the purchase order.

24. Why Instrument Tag Numbers Matter

For EPC projects, the instrument tag number should remain consistent across documents.

For example:

PT-101

should appear in:

instrument index;
datasheet;
P&ID;
quotation;
technical bid evaluation;
purchase order;
inspection documents;
packing list;
commissioning records.

This creates document traceability.

For large projects, tag consistency becomes extremely important.

A supplier may have hundreds of similar instruments.

The tag number helps prevent:

wrong instrument allocation;
wrong shipment;
wrong documentation;
installation errors.

25. How Procurement Teams Can Reduce RFQ Clarification Cycles

Every clarification email consumes time.

If an EPC project has 200 instruments and each quotation requires several rounds of clarification, procurement workload can become substantial.

The best way to reduce this is not simply to tell suppliers:

Please quote urgently.

Instead, improve the information package.

Before issuing the RFQ, check:

Is the model clearly defined?
Is the application clear?
Are process conditions available?
Is the connection specified?
Is output defined?
Are certifications identified?
Is quantity clear?
Is delivery date clear?
Are documents specified?
Is equivalent equipment allowed?
Is product condition defined?

A complete RFQ is usually faster than a short RFQ followed by ten clarification emails.

26. A One-Page Instrument RFQ Template

For smaller projects, the following format can be extremely effective.

Instrument RFQ

Project:
End User:
Tag:
Service:
Instrument Type:
Quantity:

Process

Medium:
Normal Condition:
Minimum Condition:
Maximum Condition:
Operating Pressure:
Operating Temperature:
Flow / Level Range:

Mechanical

Pipe / Vessel Size:
Process Connection:
Flange Standard:
Pressure Class:
Wetted Material:
Mounting:

Electrical

Power Supply:
Output:
Communication:
Display:
Cable Entry:

Compliance

Area Classification:
Certification:
IP Rating:
Applicable Standard:

Procurement

Approved Manufacturer:
Alternative Manufacturer Allowed: Yes / No
Product Condition:
Required Delivery:
Warranty:
Documents Required:

Supplier Response

Manufacturer:
Model:
Ordering Code:
Technical Deviation:
Unit Price:
Lead Time:
Warranty:
Country of Origin:
Stock Status:

This template is short enough for routine procurement while still providing the critical information required for a meaningful quotation.

27. EPC Procurement and MRO Procurement Are Different

EPC procurement normally begins with engineering specifications.

MRO procurement normally begins with an existing installation.

That difference changes the workflow.

EPC

Process Design → Instrument Datasheet → RFQ → Technical Evaluation → Commercial Evaluation → PO → Manufacturing → Inspection → Delivery → Installation

MRO

Failure / Maintenance Need → Existing Model → Application Verification → Replacement Identification → RFQ → Availability Check → Purchase → Delivery → Installation

EPC procurement tends to prioritize:

standardization;
documentation;
project compliance;
approved manufacturers;
engineering approval;
delivery schedule.

MRO procurement often prioritizes:

compatibility;
availability;
lead time;
replacement risk;
spare stock;
technical support.

Suppliers serving both markets need to understand this distinction.

28. Build a Procurement Database Instead of Starting From Zero Every Time

An EPC contractor or industrial plant may repeatedly purchase the same instrument families.

Instead of creating every RFQ from scratch, build a structured database containing:

manufacturer;
model;
application;
tag;
process connection;
range;
output;
certification;
previous supplier;
purchase date;
price;
lead time;
replacement model;
approved alternatives.

Over time, this becomes a valuable internal MRO knowledge base.

It also makes future procurement much faster.

For example, if a plant has purchased the same pressure transmitter 15 times over five years, the procurement team should not have to rediscover the complete specification every time.

29. The Strategic Value of a Second Source

For critical instrumentation, depending on one supplier can create procurement risk.

A second-source strategy can help when:

the original manufacturer has long lead times;
a product becomes obsolete;
prices increase;
regional supply becomes difficult;
emergency requirements occur.

However, second sourcing should be technically controlled.

The plant should maintain:

original specification;
approved alternative;
technical comparison;
configuration information;
installation notes;
approval status.

This creates a practical contingency plan.

The objective is not to replace every original manufacturer.

The objective is to avoid having only one possible procurement route when the plant needs a critical instrument.

30. What International EPC Buyers Should Ask a Chinese Instrument Supplier

When sourcing industrial instrumentation internationally, buyers should ask suppliers for more than a factory price.

Useful questions include:

Technical

Can you confirm the exact model?
Is this an original product or alternative?
Can you provide a datasheet?
Can you provide a technical comparison?
Can you confirm process compatibility?
Can you provide the complete ordering code?

Commercial

Is the item in stock?
What is the manufacturing lead time?
What is the warranty?
What Incoterm do you quote?
What is the packing method?
Can you arrange international shipment?

Documentation

Can you provide calibration?
Can you provide certificates?
Can you provide test reports?
Can you provide product photographs before shipment?

These questions are particularly useful when purchasing from overseas suppliers for urgent MRO requirements.

31. A Procurement Engineer’s Final Pre-PO Checklist

Before releasing the purchase order, confirm:

Technical

Correct instrument type
Correct model
Correct ordering code
Correct range
Correct process connection
Correct materials
Correct output
Correct communication
Correct power supply
Correct certification
All deviations approved

Commercial

Correct quantity
Unit price confirmed
Total price confirmed
Incoterm confirmed
Payment terms confirmed
Warranty confirmed
Delivery date confirmed

Documentation

Datasheet
Drawing
Certificate
Test report
Calibration certificate where required
Manual

Logistics

Packing
Shipping mark
Delivery address
Freight arrangement
Export documents

Only after these items are clear should the purchase order be finalized.

32. Conclusion: A Better RFQ Produces a Better Procurement Result

The quality of an EPC instrumentation purchase is often determined before the first quotation arrives.

A clear instrument index, complete datasheet, structured RFQ, technical deviation table and controlled vendor evaluation process can prevent many of the problems that appear later during installation and commissioning.

For procurement teams, the most useful principle is simple:

Do not ask suppliers to guess what engineering means.

Define the process.

Define the interfaces.

Define the compliance requirements.

Define what is mandatory.

Define what alternatives are acceptable.

And define what documentation is required.

For pressure transmitters, flow meters, level instruments, temperature sensors, water-quality analyzers and DCS spare parts, the same procurement discipline applies.

The objective is not simply to obtain three prices.

The objective is to obtain three technically comparable offers.

That distinction can save engineering time, reduce clarification cycles, prevent wrong deliveries and make the final purchasing decision much easier to defend.

For EPC contractors and industrial plants, a well-designed instrumentation RFQ is therefore more than a purchasing document.

It is a risk-control document.

Request an EPC Instrumentation RFQ Review

If you are preparing an RFQ for an EPC project, plant expansion, maintenance shutdown or instrumentation replacement package, you can provide:

instrument list;
existing model numbers;
process datasheets;
P&ID information;
required quantities;
technical specifications;
approved manufacturer list;
delivery schedule.

FUGUI Automation can review the requirement and provide suitable industrial instrumentation options, technical documentation and quotation support.

Send your instrument list or RFQ for technical review and quotation.

Frequently Asked Questions

What should an EPC instrumentation RFQ include?

An EPC instrumentation RFQ should normally include the instrument tag, service, process conditions, measurement range, mechanical connection, electrical requirements, certification, documentation requirements, quantity and delivery schedule.

What is an instrument datasheet?

An instrument datasheet is a technical document defining the process, mechanical, electrical and performance requirements for a particular instrument or instrument tag.

What is a technical deviation in instrumentation procurement?

A technical deviation is a difference between the project specification and the supplier’s proposed product or configuration. Deviations should be clearly identified and reviewed before purchase.

Can an EPC contractor accept an equivalent instrument?

That depends on the project specification, end-user requirements and engineering approval procedure. If alternatives are permitted, the supplier should provide a technical comparison and identify all deviations.

What is an Approved Vendor List?

An Approved Vendor List, or AVL, identifies manufacturers or suppliers that have been accepted for a particular project, company or equipment category.

How should EPC contractors compare instrumentation quotations?

Technical compliance should normally be reviewed before commercial comparison. Model, configuration, process compatibility, certification, documentation, delivery and approved deviations should be checked.

What information is required for a flow meter RFQ?

A flow meter RFQ should normally include the medium, minimum/normal/maximum flow, pressure, temperature, pipe size, connection standard, material, density, viscosity, conductivity where applicable, output and power requirements.

What information is required for a Yokogawa DCS spare-part RFQ?

The complete Yokogawa part number, system type, module type, revision, quantity and required product condition should be provided where available. Photographs of the module nameplate can also help confirm the requirement.