Two Hoses, One Chemical Bath: Specifying 51mm Code 952 Assemblies

A chemical cleaning circuit can look straightforward on a purchase order: one hose draws liquid from a bath, a pump moves it, and another hose returns it. On site, every connection has a job to do. The hose must reach without pulling on the pump. The couplings must match. The seals must suit the liquid. The completed assembly needs an identifiable test record.

That was the practical challenge behind a recent Fox Global supply for an Australian decommissioning project: two 51mm Code 952 composite hose assemblies, each 6.5 metres overall, fitted with Banjo male NPT connections and supplied complete with Banjo female camlocks, crimped, tested and tagged, with AS 2594 referenced in the supply specification.

The project provides a useful way to examine chemical hose selection from the customer’s end of the connection. It also shows why ordering a complete assembly requires more information than choosing a diameter and a length.

Fox Global is a proudly Australian-owned and family-operated business supplying industrial hose, fittings and flow-control equipment nationally. Our approach combines responsive customer service with practical technical support: understanding the application, resolving connection details and coordinating a supply that fits the job.

The project file: what the customer actually needed

The requirement developed through discussions about chemical exposure, pump interfaces, temperature, length and how the hose would sit in the cleaning bath. The final order called for two complete assemblies rather than loose hose and a collection of fittings.

One assembly was intended for pump suction; the other was intended for discharge and return to the bath. The customer identified a 2-inch Versamatic E2 diaphragm pump with ANSI Class 150 flanged connections. This created an interface requirement: the hose coupling arrangement needed to connect correctly to the pump’s flanges.

At the bath, the customer requested a properly finished open-bore arrangement that could be mechanically secured. This detail matters. An open bath does not justify an unfinished cut hose end, and it does not mean that a female camlock is required at every end of both assemblies.

A concise assembly schedule

The order was approved on 3 September 2026. Fox Global advised dispatch on 8 September, and the customer confirmed receipt on 10 September. That establishes the supply and delivery outcome; commissioning results and long-term operating performance are separate matters.

For procurement teams, the lesson is practical: resolving the ends, assembled length and documentation before manufacture helps avoid site modifications after delivery.

Start with the liquid, then work outwards

“Chemical hose” describes a category, not universal chemical resistance. A sound specification follows the liquid through every material it can contact, including the hose lining, fittings, gasket, thread sealant, flange adapter and pump.

The project discussions concerned a heated, acidic cleaning blend. The customer described normal operation around 65–70°C, with a possible upper temperature approaching 80°C. An approximately 10 bar maximum requirement was discussed, although expected routine pressure was lower.

These were application requirements supplied for assessment. They should not be read as a published rating for the completed 51mm assembly, or as confirmation that its components can simultaneously operate at those maximum conditions.

Why a chemical name or pH value is insufficient

An acidic blend can contain several active ingredients. Concentration, temperature, exposure time and interactions between ingredients may change how it affects a material. A compatibility entry for one ingredient cannot automatically approve the whole blend.

For this project, the correspondence did not establish definitive manufacturer approval for the mixture. Fox Global sought confirmation from the chemical manufacturer or end user about material suitability. That distinction remains important when discussing the assembly: a delivered product and an approved chemical duty are different records.

Banjo makes a similar distinction in its own guidance. Its compatibility recommendations generally relate to room-temperature exposure unless stated otherwise, and mixtures or elevated temperatures can change the result. Banjo also states that its polypropylene components should not be used with low-flash-point chemicals, even where a chemical resistance entry appears favourable. Banjo chemical resistance guidance.

Build a material approval record

Before specifying a chemical transfer hose, collect:

• The current safety data sheet and product identification.
• Working concentration and any dilution or mixing procedure.
• Normal temperature, maximum temperature and credible temperature excursions.
• Operating pressure, possible pressure peaks and suction conditions.
• Whether exposure is continuous, intermittent or prolonged during shutdown.
• Flushing liquids, cleaning agents and disposal requirements.
• Written compatibility advice covering all wetted components.

This record is especially valuable when a cleaning contractor changes products between jobs. The same hose size and pump may remain in use while the chemical exposure changes substantially.

Planning a similar assembly? Send the chemical information, operating conditions and connection photos to sales@foxglobal.com.au, or call 1300 852 795. Fox Global can help identify the specification questions before the order reaches the workshop.

What Code 952 tells you—and what the assembly still needs

Code 952 is used in Australian composite hose catalogues for chemical suction and delivery products. Composite construction uses layers of films and fabrics supported by helical wires, rather than relying on a single thick rubber tube.

For example, Pacific Hoseflex describes its Code 952 construction as polypropylene films and fabrics, a polypropylene-coated steel inner wire and a stainless steel outer wire. Its published temperature range is −20°C to +80°C. Those details identify that manufacturer’s product; they do not establish the operating limits of every hose sold under a similar code. Pacific Hoseflex Code 952 product information.

Fox Global’s composite hose range provides a starting point for product selection. For a particular order, the controlling documents should identify the supplied hose manufacturer, product reference, size and applicable data sheet.

Read the complete specification rather than borrowing one number

The following information belongs in a final technical review:

Cover colours and stripes can assist identification within a particular range. They are not a universal classification of which chemicals a hose can carry.

Where composite construction earns its place

A suitable composite hose can provide useful flexibility between equipment that cannot be joined conveniently with rigid pipe. It can also make a temporary chemical transfer route easier to position and remove, subject to handling weight and site access.

That flexibility has limits. Composite hose still needs protection from crushing, sharp edges and damage to its reinforcement. It should not become a convenient lifting point, a substitute for pipe supports or a hose that is repeatedly dragged across abrasive concrete.

The connection audit: NPT, camlocks and flanges

The most avoidable assembly problems often occur where two otherwise suitable components meet. “Two inch” is not a complete connection description.

Thread gender and camlock gender are different

A male NPT thread joins a matching female NPT thread. A female camlock coupler joins a compatible male camlock adapter. These are different interfaces, even when they appear on the same fitting.

Banjo’s 200D is one catalogue example: a 2-inch female camlock coupler with a 2-inch female threaded connection. Banjo identifies glass-filled polypropylene construction, stainless steel operating hardware and an EPDM gasket for that part. This example illustrates the terminology; it does not identify the precise part number or gasket supplied on this project. Banjo 200D product specifications.

For repeat orders, record the actual Banjo part numbers and seal materials. A description such as “female camlock” leaves too much room for substitution.

NPT and BSP should also be distinguished explicitly. They use different thread forms and should not be forced together. Where an existing connection is unclear, identify it from the equipment documentation or suitable measurements before ordering. Fox Global’s thread identification guide can support that discussion.

The gasket is a chemical component

The camlock gasket forms part of the wetted assembly. Selecting a chemically suitable hose and fitting body does not compensate for an unsuitable seal.

A gasket that swells, hardens or loses resilience can affect sealing and coupling operation. Material selection must consider the liquid and temperature, including cleaning fluids used after the main transfer duty. EPDM, FKM and other compounds have different suitability profiles; none should be treated as a universal upgrade.

Spare gaskets should therefore be ordered by material and part reference, stored clearly and kept separate from visually similar alternatives.

ANSI Class 150 does not mean “150 psi everywhere”

The pump’s flange designation identifies a flange class and connection arrangement. It does not assign a universal working pressure to the hose, camlock or adapter attached to it.

Confirm flange size, drilling, facing, material, gasket and the adapter’s rated conditions. The complete assembly must stay within the limits of every relevant component, after accounting for temperature and service conditions.

Support also matters. The weight of a liquid-filled hose and its adapters should not hang from a polypropylene thread or impose unnecessary bending load on a pump connection. Arrange supports around the equipment layout, with enough access to operate and inspect the camlocks.

Why 6.5 metres must mean a finished measurement

The project specified 6.5 metres overall assembled length. That is not necessarily the same as cutting 6.5 metres of hose and adding fittings.

End fittings contribute length, and their insertion into the hose affects the finished dimension. The quotation or drawing should state the measurement endpoints, agreed tolerance and whether removable adapters are included.

An assembly that is slightly too short may be pulled tight between equipment. An unnecessarily long one may create loops, trip hazards and additional liquid hold-up. The correct length starts with the actual route, not just the straight-line distance from pump to bath.

Allow for the liquid inside

Using a nominal 51mm internal diameter, a straight 6.5m hose has an approximate internal volume of:

π × (0.051m ÷ 2)² × 6.5m ≈ 0.0133m³, or 13.3 litres.

Two hoses therefore represent roughly 26.6 litres before adding the pump and fittings. This is a geometric estimate; actual internal dimensions and fittings affect the installed volume.

That quantity matters when planning draining, flushing, waste capture and manual handling. At a liquid density of 1.2kg/L, the contents of one hose alone would weigh about 16kg, excluding the hose and couplings.

The calculation is useful even before the final chemical is selected. It explains why a support arrangement that looks adequate with an empty hose may behave differently when the system is full.

Check flow as well as connection size

A 2-inch pump connection does not guarantee a particular flow through 6.5 metres of hose. Pump capability, liquid properties, suction conditions, fittings and the circuit arrangement all influence the operating result.

For a simple illustration, a 51mm internal diameter gives an area of approximately 0.00204 square metres. At 200 litres per minute, the average liquid velocity would be about 1.63 metres per second. At 400 litres per minute, it would be about 3.26 metres per second.

These figures are arithmetic examples, not recommended flow rates for the project. They show how a change in flow alters the conditions inside the same hose. Pressure-loss assessment also needs fluid viscosity, density and temperature, along with the actual internal geometry and fittings.

Ask the pump supplier or responsible engineer to review the required duty point. On suction, account for liquid level, elevation and available inlet conditions. On discharge, consider the return arrangement and any equipment or restrictions in the path. An open receiving bath does not remove pressure losses through the circuit.

For a diaphragm pump, consider pulsating operation when assessing hose movement and supports. If damping or another system change is proposed, its materials and suitability also need review.

Recording the intended flow gives future maintenance teams a useful reference. If performance changes later, they can compare the operating conditions with the original duty instead of assuming the hose diameter is the only relevant factor.

Choosing between assembly options

Code 952 with Banjo connections is one configuration within a much broader industrial hose selection process. Different duties may justify different liners, fittings or connection systems.

The comparison is a way to organise a discussion, not a ranking of universally better materials. A more expensive fitting can still be wrong for the liquid, and a chemically resistant liner can still be wrong for the installation geometry.

For a remote Australian worksite, consider replacement availability as well. Standardising approved fitting and gasket references can simplify spares without sacrificing the application requirements.

What “crimped, tested and tagged” should deliver

These three words describe different parts of supply quality. Each deserves a clear meaning in the purchase order and handover documents.

Crimped identifies the attachment method. Reliable assembly depends on a suitable hose-and-fitting system, controlled preparation and the manufacturer’s approved assembly procedure. A neat ferrule alone cannot demonstrate that the underlying combination is correct.

Tested needs a defined scope. A pressure test can provide evidence about the assembly under specified test conditions. It does not establish long-term resistance to every chemical, prove vacuum performance unless that is assessed, or approve operation above component limits.

Tagged provides an identification link. The useful outcome is a hose that can be matched to its record throughout receipt, installation, inspection and replacement.

Treat the AS 2594 reference precisely

The project specification references AS 2594. The published title is Hose and hose assemblies for liquid chemicals. Intertek Inform’s standards catalogue lists AS 2594-1983 as withdrawn. It should therefore not be advertised as a current standard without qualification. AS 2594-1983 catalogue status.

Where a project uses that reference, clarify the agreed manufacturing and testing basis, the edition, applicable requirements and the customer’s acceptance criteria. Any current project specification also needs to be addressed explicitly.

A useful handover record identifies the assembly, hose and fittings, permitted service limits, test procedure, test medium, pressure, duration, date and result, as applicable. Electrical testing should be recorded where required by the selected construction and duty.

Do not substitute a generic “tested to twice working pressure” statement for the actual procedure. Test pressure, working pressure and burst pressure describe different things.

Need the assembly and documentation quoted together? Contact Fox Global on 1300 852 795 or sales@foxglobal.com.au and include your site’s testing, tagging and acceptance requirements.

Before the pump starts: a practical site review

Receiving inspection should compare the delivery with the order while the equipment is still accessible. Check identification, overall length, fitting types and the supporting paperwork before installation.

Examine the hose for transit damage, crushing, kinks and displaced fittings. During routing, avoid twisting and respect the manufacturer’s minimum bend radius. Pacific Hoseflex’s installation guidance stresses application review, damage inspection and avoiding excessive bending or torsional loading. Hose installation guidance.

For the chemical bath arrangement, confirm that the suction end remains suitably positioned as the liquid level changes. Secure the return so it cannot move unexpectedly, and assess splashing, aeration and operator access. Use a properly finished termination approved for the assembly.

Walk through the normal operating sequence with the people who will use it. Identify isolation points, drainage arrangements and where residual liquid will go. Conventional camlocks are not automatically dry-disconnect couplings: plan for retained liquid before opening any connection.

Label suction and return clearly where confusion is possible. Photograph the accepted installation and keep the arrangement with the hose record. That gives the next shift a reference and makes later layout changes easier to assess.

When the circuit is not behaving as expected

Troubleshooting should begin with safe isolation and an understanding of the whole circuit. Increasing pump input or tightening a leaking connection is not a reliable substitute for identifying the cause.

These are investigation prompts rather than remote diagnoses. A leaking or visibly damaged chemical hose should not be returned to duty simply because an adjustment temporarily stops the symptom.

Keep the assembly useful beyond the first job

Maintenance starts with a service history. Record the liquid handled, temperature range, inspections, cleaning, damage and any component changes. If an assembly moves between projects, that record becomes especially important.

Set inspection and retest intervals from manufacturer guidance, the operating duty, site requirements and observed condition. There is no sensible universal interval for every chemical hose in every application.

Before reuse, assess the complete assembly: reinforcement, cover, end attachments, fittings, cam arms and seals. Check that supports and protective measures remain effective. A replacement gasket or adapter should match the approved specification, rather than whichever spare happens to be nearby.

Cleaning also needs approval. A flushing chemical or elevated cleaning temperature can create a different exposure from the normal process. Manage residues through the site’s established collection and disposal arrangements.

Store the assembly clean, appropriately drained and protected, following the manufacturer’s recommendations. Keep identification readable. Avoid arrangements that create tight bends or leave the hose vulnerable to vehicle traffic and dropped equipment.

Questions procurement teams ask before placing the order

Is 51mm the same as a 2-inch hose?

It is commonly described as nominal 2-inch hose. Confirm the actual hose dimensions and fitting references, particularly when matching stems, ferrules or existing equipment.

Can the assembly operate at 80°C and 10 bar?

That cannot be established from the project description alone. The exact hose, fittings, seals and pressure–temperature limits must support the combined duty, with chemical suitability assessed separately.

Does a successful pressure test prove chemical compatibility?

No. A pressure test assesses defined mechanical conditions. Chemical resistance depends on the actual materials, mixture, concentration, temperature and exposure time.

Can the same hose be used for suction and discharge?

Only where the selected construction and complete assembly are suitable for both duties. Confirm vacuum capability independently of the positive-pressure rating.

Are these hoses suitable for food, fuel or potable water?

Those applications require their own material, certification and service assessment. General chemical-hose suitability does not establish food-contact, fuel-transfer or drinking-water approval.

Can Fox Global supply different lengths or connections?

Fox Global can discuss custom assemblies around the required route and equipment interfaces. Provide the overall finished length, end connections, liquid, duty and documentation requirements so the proposed arrangement can be reviewed.

An Australian supply partner for the complete requirement

Fox Global supports customers across Mining, Civil Construction, Food & Beverage, Chemical Processing, Water Treatment, Manufacturing, Agriculture, Oil & Gas, Marine and Waste Management. That industry experience helps us ask practical questions about equipment interfaces, handling, maintenance access and project schedules.

Each sector has distinct requirements. A food processing application may need documented food-contact suitability; an oil and gas application may introduce flammability and electrical considerations; a water treatment project may involve a specific dosing chemical. Industry experience guides product selection without implying that one Code 952 assembly suits every service.

Our national supply capability supports enquiries from Sydney, Melbourne, Brisbane, Perth and Adelaide, as well as regional and remote Australian projects. Delivery planning should include the required date, site access, freight destination and any shutdown constraints.

For example, a regional maintenance team may need replacement seals delivered with its hoses because local sourcing is limited. A metropolitan processing facility may place more emphasis on matching existing pump connections and minimising changeover work. These are practical planning scenarios, with the final configuration determined by the actual duty.

Fast responses matter, but useful responses also resolve details. Fox Global brings technical expertise, custom supply options and personal customer service to that process, from the first application enquiry through order coordination and delivery follow-up.

Send a brief that can become a build specification

Include the chemical and concentration, temperature, pressure and vacuum conditions, flow requirement, assembled length, pump details, end-connection photos and required delivery date. Add any site-specific test, identification and documentation requirements.

For 51mm Code 952 composite hose assemblies with Banjo NPT fittings and female camlocks, or an alternative configuration for your application, call 1300 852 795 or email sales@foxglobal.com.au.