ENGINEERING / EXISTING EQUIPMENT

Existing Equipment & Specification Review

A replacement project does not need to begin with a perfect specification. Existing drawings, nameplates, equipment photos, site dimensions and operating information can provide a practical starting point.

The review identifies what is confirmed, what must remain compatible with the installed system, and what still needs technical clarification before a replacement basis is established.

SEND YOUR EXISTING EQUIPMENT DATA
VIEW PROCESS INTERFACE REVIEW

01 / IDENTIFYExisting equipment and available records

02 / ESTABLISHEvidence quality and source reliability

03 / DEFINEInterfaces and relationships that matter

04 / SEPARATEFixed constraints from changeable features

05 / CHECKCurrent process duty and equipment role

06 / COORDINATEInterfaces, site and installed equipment

07 / IDENTIFYMissing information and open questions

08 / BUILDA structured replacement basis

01 / START WITH EQUIPMENT IDENTITY

Identify the Existing Equipment Before Comparing the Replacement

Existing Reactor Specification Review Scope

The existing reactor specification review can begin by establishing what equipment is actually installed. Model names alone may be incomplete, obsolete or inconsistent across old records.

Use the most reliable available identifiers together rather than relying on one label or one photograph. For an existing reactor specification review, each identifier should be tracked with its source and status.

NameplateManufacturer, model / serial information and recorded equipment data where legible.

Original DrawingGA, nozzle arrangement, vessel drawing or component drawing.

DatasheetOriginal process or mechanical specification where available.

Equipment PhotosOverall equipment, top head, supports, drive, bottom outlet and connected equipment.

Plant RecordsPurchase documents, maintenance records or prior technical correspondence where available.

Evidence rule: Record all legible nameplate information and keep uncertain or unreadable details open for confirmation.

02 / EVIDENCE HIERARCHY

Not All Existing Information Has the Same Reliability

Old projects often contain conflicting dimensions, revised drawings, field modifications or incomplete records. The review should therefore distinguish source quality before using information as the replacement basis. An existing reactor specification review keeps uncertain information visible instead of silently treating it as confirmed.

LEVEL 1 / ORIGINAL EQUIPMENT DOCUMENTSHIGHEST DOCUMENTARY VALUE

Manufacturer drawing
Original datasheet
Certified / approved project drawing
Legible nameplate

LEVEL 2 / VERIFIED SITE INFORMATIONFIELD CONFIRMATION

Field-measured dimensions
Confirmed nozzle elevations
Confirmed support positions
Confirmed tie-in locations

LEVEL 3 / VISUAL EVIDENCEINSTALLED CONDITION

Equipment photos
Connection photos
Drive / agitator photos
Site arrangement photos

LEVEL 4 / OPERATING INFORMATIONPROCESS CONTEXT

Current process duty
Batch size
Operating temperature / pressure
Mixing observations
Known operating problems

LEVEL 5 / UNCONFIRMED INFORMATIONKEEP OPEN

Old verbal description
Handwritten notes
Estimated dimensions
Assumed model equivalence

When sources conflict: Keep the discrepancy open until it is verified. Do not select the most convenient value simply to complete the specification.

03 / DEFINE WHAT MUST MATCH

Replacement Review Starts With the Interfaces That Cannot Change Easily

A replacement vessel does not need every detail to be identical to the old equipment. What matters first is which interfaces, dimensions and operating relationships must remain compatible with the installed system. This is the practical purpose of an existing reactor specification review before replacement options are compared.

These fixed constraints should be separated from features that can be redesigned or updated.

Installation PositionWhere the equipment must fit in the plant.

Support / FoundationExisting structural interface that may need to remain compatible.

Major Nozzle Tie-InsConnections that must align with installed piping.

Overhead ConnectionRelationship with condenser, column or other equipment above the vessel.

Bottom DischargeElevation and downstream receiving relationship.

Drive / Agitator InterfaceWhere the existing drive, agitator or maintenance arrangement must remain compatible.

Overall ClearanceHeight, platform, floor opening or overhead space that cannot easily change.

Utility Tie-InsExisting heating / cooling connections where the plant intends to reuse them.

Site qualification: These conditions may be fixed depending on the site. They should not automatically be treated as completely identical requirements.

04 / FIXED VS CHANGEABLE

Separate Fixed Interfaces From Features That Can Be Re-Defined

FIXED / SITE-DEPENDENT

Possible examples:

Vessel location
Support points
Fixed piping tie-ins
Platform elevation
Floor opening
Overhead clearance
Connected equipment location
Existing utility headers

REVIEWABLE / PROJECT-DEPENDENT

Possible examples:

Vessel capacity basis
Agitation arrangement
Access arrangement
Instrumentation interfaces
Minor nozzle arrangement
Thermal arrangement
Replacement component details

Boundary: The actual boundary must be confirmed project by project. A feature should not be assumed fixed merely because it exists on the old equipment.

05 / SAME SIZE DOES NOT MEAN SAME DUTY

A Dimensional Match Is Not Enough to Confirm a Replacement

Two vessels can have similar overall dimensions while differing in process duty, pressure / vacuum conditions, thermal arrangement, agitation or product-contact requirements.

The existing process basis should therefore be re-confirmed rather than assuming the old equipment definition remains correct for the current production requirement.

Process MediumWhat the equipment handles now.

Working CapacityCurrent batch or operating volume.

Operating ConditionsTemperature and pressure / vacuum where applicable.

Mixing DutyWhat the current process requires from agitation.

Thermal DutyCurrent heating / cooling requirement.

Product / Process ChangesWhether the process has changed since the original equipment was installed.

See Process Data & Equipment Definition for the related process-input role.

06 / INTERFACE COMPATIBILITY

Compatibility Must Be Checked Around the Entire Installed System

Replacement compatibility is a relationship between the new equipment and the surrounding plant, not a comparison of model numbers alone. An existing reactor specification review therefore checks the equipment in its installed context.

Vessel ↔ StructureSupports, floor, platform and installation space.

Vessel ↔ PipingMajor nozzle elevation / orientation and tie-in requirements.

Vessel ↔ AgitationDrive, shaft, vessel opening and maintenance relationship.

Vessel ↔ Thermal UtilitiesHeating / cooling service connections and site routing.

Vessel ↔ InstrumentationExisting measurement and control interfaces.

Vessel ↔ Connected EquipmentCondenser, receiver, storage vessel, piping or other process equipment.

See Process Interfaces & Nozzle Review for the related connection-coordination role.

07 / PHOTOS: WHAT TO CAPTURE

A Few Specific Photos Are More Useful Than Many General Photos

When drawings are missing, targeted equipment photos can reveal important interfaces and help identify what additional dimensions are needed.

1. Full Equipment ViewShow the entire vessel and surrounding structure.

2. NameplateTake a clear, readable close-up.

3. Top HeadShow drive, manway, major nozzles and connected piping.

4. Bottom / DischargeShow outlet, valve / piping relationship and available clearance.

5. SupportsShow legs, lugs, frame or structural relationship.

6. Drive / AgitatorShow motor, gearbox, seal area and vessel connection where visible.

7. Utility ConnectionsShow jacket / thermal service connections.

8. Site ClearanceShow nearby platform, steelwork, piping and overhead space.

Safe capture: Do not require customers to photograph unsafe or restricted locations. Do not encourage equipment disassembly for photography.

08 / DIMENSIONS TO VERIFY

Measure the Dimensions That Affect Interchangeability

If the original drawing is missing or uncertain, field measurements should focus on the dimensions that determine installation and connection compatibility. This gives the existing reactor specification review a measurable basis for the next clarification step.

Overall HeightWhere installation / overhead clearance matters.

Vessel / Support ReferenceDimensions needed to understand the installed position.

Support Spacing / ElevationWhere structural compatibility matters.

Major Nozzle ElevationsVertical location of fixed piping tie-ins.

Major Nozzle OrientationDirectional relationship where existing piping is fixed.

Bottom Outlet ElevationRelationship with floor, valve and downstream piping.

Drive / Maintenance ClearanceAvailable vertical / surrounding space.

Platform / Floor OpeningWhere the vessel passes through or interacts with existing structure.

Measurement boundary: This page discusses replacement-coordination measurements. It does not teach customers to measure pressure-vessel fabrication dimensions for independent manufacture.

09 / EXISTING DRAWINGS

Old Drawings Are Valuable — But Revision Status Matters

An old GA drawing can be one of the most useful replacement references, but it should not automatically be treated as the current installed condition.

Field modifications, piping changes, replaced drives or earlier equipment revisions may have changed the installed arrangement.

Drawing NumberRecord if available.

RevisionCheck whether the drawing has a revision or approval status.

Equipment IdentificationConfirm that the drawing belongs to the installed equipment.

Critical DimensionsCompare major site-sensitive dimensions where practical.

Field ModificationsIdentify visible differences between the drawing and the installed equipment.

Connected EquipmentCheck whether condenser, receiver, drive or support arrangements have changed.

10 / LEGACY OR UNKNOWN EQUIPMENT

Unknown Manufacturer or Missing Model Number Does Not End the Review

Older equipment may have an unreadable nameplate, discontinued model or missing manufacturer documentation.

The review can still begin by building an evidence package from the installed equipment and the current process requirement.

Useful Starting Evidence

Clear overall photos
Nameplate fragments / markings
Existing dimensions
Nozzle locations
Support arrangement

Process and Site Context

Drive information
Available process data
Current operating duty
Site constraints

The objective is not to guess the original model. It is to establish enough confirmed information to define the replacement requirement.

11 / REPLACEMENT VS CHANGED REQUIREMENT

Decide Whether the Goal Is Compatibility or a Changed Equipment Requirement

Some projects need the new equipment to reproduce the existing interfaces as closely as practical. Others use the replacement opportunity to change capacity, agitation, thermal duty, access or process connections.

These two objectives should be separated early because they lead to different engineering decisions. An existing reactor specification review should record whether the project is preserving interfaces, changing the requirement, or evaluating both paths.

Where a project specification names an external code or standard, use the governing project documents as the source of truth; do not infer a requirement from an old model number or a photograph. ASME Codes & Standards is a general reference only and does not replace project-specific confirmation.

REPLACEMENT-FOCUSED

Priority:

Site compatibility
Major tie-ins
Supports
Clearances
Existing process duty

CHANGE / UPGRADE-FOCUSED

Possible review:

Changed capacity
Changed process duty
Changed agitation requirement
Changed thermal requirement
Changed interfaces
New connected equipment

Project language: Compatibility requirements and requested changes should be separated before the new equipment configuration is finalized.

12 / KNOWN PROBLEMS

Operating Problems Are Useful Inputs — Not Automatic Diagnoses

Existing operating problems can help identify what needs further review, but they should not be used to claim a root cause without sufficient evidence.

Slow Heating / CoolingCurrent thermal performance observation.

Poor Mixing / SettlingKnown process behaviour.

Frequent Seal / Drive IssuesMechanical operating observation.

Discharge DifficultyKnown product-transfer issue.

Limited Maintenance AccessSite / equipment usability issue.

Piping / Interface ConflictExisting installation problem.

Review language: Treat these observations as possible factors to review, not as an automatic diagnosis.

Related reviews: Heat Transfer Engineering and Agitation Engineering.

13 / REPLACEMENT EVIDENCE MATRIX

Track What Is Confirmed, Measured, Assumed or Still Open

A concise evidence matrix keeps the source, status and replacement impact of each item visible during clarification. It is a practical working record for an existing reactor specification review.

ITEMEquipment or interface item.

SOURCEDrawing / nameplate / field measurement / photo / process data.

VALUE / DESCRIPTIONProject information.

STATUSConfirmed / Field Verified / Unconfirmed / Open.

REPLACEMENT IMPACTCritical / Relevant / Reference.

ACTIONAccept / Verify / Measure / Customer Confirm / By Others.

Matrix boundary: This page shows the fields and method only. It does not fill in a fabricated project example.

14 / REPLACEMENT REVIEW QUESTIONS

Six Questions Keep the Replacement Review Focused

What equipment is actually installed?

Which information is supported by reliable evidence?

Which dimensions and interfaces cannot change?

Has the process duty changed since the old equipment was installed?

Which existing problems or constraints should the new equipment address?

What information is still missing before the replacement can be defined?

15 / ENGINEERING OUTPUTS

What the Existing Equipment Review Should Produce

The existing reactor specification review should produce a structured basis for the next equipment-definition and quotation stage.

Equipment Identity SummaryConfirmed available information describing the existing unit.

Evidence RegisterDocuments, photos, measurements and their reliability / status.

Fixed Constraint ListInterfaces, dimensions and site relationships that need to remain visible.

Current Process BasisConfirmed operating duty carried into the replacement review.

Interface Compatibility BasisMajor piping, support, utility, agitation and connected-equipment requirements.

Open Information ListInformation that still needs confirmation before final configuration.

Replacement / Change BoundaryClear distinction between compatibility requirements and requested equipment changes.

RFQ / Engineering BasisA structured set of information that can support the next equipment-definition and quotation stage.

Output boundary: The next stage depends on the relevant information being confirmed. This page does not promise a completed replacement design from incomplete records.

16 / WHAT TO SEND

Send the Existing Information — Even If It Is Incomplete

Send the information currently available. The most useful starting package may include:

Nameplate photoReadable equipment identification where available.

Existing GA drawingCurrent or historical arrangement reference.

Existing datasheetProcess or mechanical basis where available.

Equipment photosOverall equipment and surrounding arrangement.

Nozzle / interface drawingConnection and tie-in reference.

Major measured dimensionsSite-sensitive dimensions where known.

Site / platform photosAccess, clearance and structural context.

Existing support informationStructural relationship where available.

Agitator / drive informationExisting mixing-system relationship.

Utility connection informationHeating / cooling service relationship.

Current process mediumWhat the equipment handles now.

Working capacityCurrent batch or operating volume.

Operating temperatureCurrent process condition where available.

Pressure / vacuumCurrent condition where applicable.

Known operating problemsObserved issues that need technical review.

Required changesRequested changes from the existing unit, if any.

A complete legacy file is not required to start. One clear nameplate photo, one old drawing or a useful set of site photos may already identify the next information that needs to be confirmed.

SEND YOUR EXISTING EQUIPMENT DATA

Use these pages to connect process data, vessel configuration, interfaces, mixing, thermal services and relevant equipment references.

FAQ

Can a replacement reactor review begin without the original datasheet?

Yes. Existing drawings, nameplate information, equipment photos, measured dimensions and current operating data can provide a practical starting point. Missing information should remain identified for confirmation.

Is matching the old reactor model number enough to confirm a replacement?

No. The installed interfaces, supports, clearances, process duty, agitation, thermal requirements and connected equipment also need to be reviewed.

What photos are most useful for an existing reactor replacement?

Useful photos include the full equipment, nameplate, top head, bottom outlet, supports, drive / agitator interface, utility connections and surrounding site arrangement.

What if the original manufacturer or model is unknown?

The review can still begin from site photos, measured dimensions, connection locations, drive information and current process data. The objective is to define the replacement requirement rather than guess an unsupported original model.

Can GLP confirm a replacement from photos alone?

No. Photos are useful evidence, but the installed arrangement also depends on verified dimensions, supports, nozzle locations, process duty, utilities, access and other project interfaces.

Can the replacement equipment include changes from the existing unit?

Yes, changes can be discussed where the project requires them. Compatibility requirements and requested changes should be separated clearly before the new equipment configuration is finalized.

REPLACEMENT REVIEW

Start With the Existing Equipment — Not a Perfect New Specification

Send the old drawing, nameplate, equipment photos and the process information currently available. The first step is to identify which existing interfaces must remain compatible and which details still need confirmation. This is the starting point for an existing reactor specification review.