Troy Dualam Inc. engineers and shop-fabricates custom FRP and dual-laminate gas scrubbers, absorbers and packed towers to an agreed project design basis. The design basis must document the gas composition, flow, temperature, pressure or vacuum, process duty, internals, site loads, required performance, materials, inspection and testing.

Process-performance responsibility must be defined for each project. Troy Dualam does not imply a guaranteed removal efficiency, pressure drop or process result when another party supplies the process design.

Custom Scrubber Configurations and Internals

The equipment arrangement is selected for the documented duty and available site envelope. Project-specific configurations can include vertical packed towers, horizontal cross-flow units, venturi sections, mist-eliminator housings and multi-stage equipment.

Internals and accessories can include project-selected packing supports, liquid distributors, spray headers, bed limiters, mist eliminators, drains, access openings, nozzles, lifting attachments and external supports. Geometry, materials, loads, access and inspection requirements must be defined for the actual project.

Shop Fabrication and Transport Scope

Troy Dualam’s practical shop-fabrication and transport capability includes vessels up to 14 feet in diameter, subject to geometry, transport route and site access. The 14-foot figure is not an ASME RTP-1 limit. Larger equipment can be fabricated in transportable sections only when the project design and field scope define how those sections will be handled and assembled.

Material System Selection

A scrubber can use conventional FRP or a dual-laminate construction. The material system is selected from the complete documented service—not from the chemical name alone.

  • Conventional FRP: A project-selected thermoset resin system, corrosion barrier and structural laminate are evaluated against the gas and liquid phases, concentration, temperature, condensate, upset and cleaning conditions, permeation, abrasion and mechanical loads.
  • Dual laminate: A thermoplastic process-side liner provides the chemical barrier and receives no structural design credit; the structural FRP backing carries the mechanical loads. Candidate liner families may include PP, PVC-U, PVC-C (CPVC), PVDF, ECTFE, FEP and PFA, subject to the exact service and fabrication details.

No material is universally compatible. Published compatibility data for a resin or liner does not establish the suitability of the complete fabricated scrubber.

Information Required for Engineering Review

Provide the available process and mechanical basis:

  • all gas, vapour, liquid and entrained-solid constituents;
  • normal, design and upset concentrations and temperatures;
  • gas and liquid flow rates, pressure drop and required process performance;
  • internal pressure, external pressure or vacuum conditions;
  • equipment orientation, dimensions, access and transport constraints;
  • packing, distributors, sprays, mist elimination and other internals;
  • nozzles, piping loads, supports, wind, seismic and environmental loads;
  • required materials, code basis, inspection, testing and documentation;
  • the division of responsibility for process design, mechanical design, field work and commissioning.

Project-Specific Inspection and Testing

Inspection and testing are established by the equipment type, material system, applicable code or specification and project quality plan. Depending on the agreed scope, they may include material traceability, visual and dimensional inspection, laminate and cure checks, thermoplastic-weld inspection, holiday or spark testing when technically applicable, and leak, water-fill or pressure testing.

A holiday test detects certain liner discontinuities when the method is applicable and specified. It does not by itself prove weld strength, backing adhesion, chemical compatibility, process performance or structural adequacy. No one test package is represented as applying to every scrubber.

ASME RTP Authorization Scope

Troy Dualam Inc. holds ASME RTP Certificate of Authorization No. RTP-51. The ASME Certification Mark with RTP Designator applies only when an eligible shop-fabricated vessel is built, inspected and marked under the authorized project scope.

A scrubber is not automatically markable because it is made from FRP, is shop-fabricated or operates below a particular pressure. Code applicability, design conditions, inspection, testing and marking are confirmed for the specific project. No. RTP-51 does not authorize field fabrication, field assembly or field repair.

Field Assembly and Service Scope

Field stack-up, tie-ins, installation, inspection and outage work may be provided or overseen by Troy Dualam Services Inc. or another qualified field contractor when that work is specifically included in the project scope. The quotation, drawings and responsibility matrix identify who is responsible for process design, foundations, rigging, assembly, piping, internals, testing and commissioning.

Frequently Asked Questions

What information is needed to review an FRP scrubber?

The review requires the complete gas and liquid composition, concentrations, temperatures, flow rates, pressure or vacuum, required performance, internals, site loads, materials, code basis and project responsibilities.

Are all Troy Dualam scrubbers marked to ASME RTP-1?

No. Troy Dualam Inc. holds ASME RTP Certificate of Authorization No. RTP-51, but the ASME Certification Mark with RTP Designator applies only to eligible shop-fabricated vessels built, inspected and marked under the authorized project scope.

Can a scrubber use a dual-laminate liner?

Yes, when the exact chemical, temperature, permeation, fabrication and operating conditions support that selection. The thermoplastic liner is the chemical barrier and the FRP backing carries the structural loads.

Is spark testing included on every dual-laminate scrubber?

No. Holiday or spark testing is used only when technically applicable and specified in the project inspection plan. It does not replace weld, interface, compatibility or structural review.

Send Troy Dualam the available scrubber process basis, drawings and project requirements.