Acids, alkalis, chemical drains, ETP

PPH Pipes and Fittings for Chemical Service

Name: PPH Single Layer Piping
Brand: PPH

One material all the way through. Polypropylene homopolymer produced as a single homogeneous wall, with no liner to lift, no reinforcement layer to separate and no bond line for an acid to find.

Anjney offers electrofusion jointing on PPH up to 630 mm. We do not supply PPH on butt fusion.

Send your line list PPH brochure

20–630 mmPipe range

PN 10–20SDR 11, 7.4 and 6

EN ISO 15494Industrial plastics piping standard

200–630 mmElectrofusion jointing

Why PPH for chemical duty

Polypropylene homopolymer is the stiffest and most chemically resistant member of the polypropylene family. What the fluid touches on day one is the same material through the full wall, and the same material the welder fuses.

Resistant where metal is not
Inert to hydrochloric acid, dilute sulphuric acid, caustic, salts and brine at concentrations that pit and scale stainless and mild steel. No corrosion allowance to design around.
Stiffer than PP-R
The highest tensile modulus and yield strength in the PP family, so the line holds its shape between supports.
Non-shedding bore
A smooth surface that does not corrode, scale or add metal ions to the stream, which dosing and transfer duties need.
Light and fast to install
About a tenth of the weight of steel pipe of the same size. Lighter supports, smaller crews, shorter shutdowns.
Welded, not jointed
Every connection is a fusion weld. No gasket, thread or flange face to weep in aggressive service.
Low maintenance through life
No painting, re-lining or rescaling shutdowns, and no galvanic pair to manage at dissimilar-metal transitions.

Typical properties of PPH

Material values for PPH pipe grades, measured to the ISO test methods shown.

Typical published values for PPH pipe material; individual resin grades vary. Design figures for your project come from the Anjney data sheet: ask us for it with your enquiry.

Property	Typical value	Test method
Density	0.90–0.91 g/cm³	ISO 1183
Tensile stress at yield	30–33 MPa	ISO 527
Tensile modulus	1300–1700 MPa	ISO 527
Vicat softening temperature	About 150 °C	ISO 306
Linear thermal expansion	0.15–0.18 mm/m·K	DIN 53752
Thermal conductivity	0.22–0.23 W/m·K	EN 12664
Surface resistivity	> 10¹⁶ Ω	IEC 60093
Service temperature	0 °C to +80 °C continuous; short-term to about 100 °C	Depends on pressure and medium

Chemical resistance guide

A first check for common media. Strong oxidisers, aromatic and chlorinated solvents attack polypropylene; most acids, alkalis and salts do not.

Medium	Concentration	At about 20 °C	At about 50 °C
Hydrochloric acid, HCl	Up to concentrated	Resistant	Resistant
Sulphuric acid, H₂SO₄	Up to 30%	Resistant	Resistant
Sulphuric acid, H₂SO₄	Concentrated	Not recommended	Not recommended
Phosphoric acid, H₃PO₄	Up to 85%	Resistant	Resistant
Hydrofluoric acid, HF	Up to 40%	Resistant	Resistant
Nitric acid, HNO₃	Up to 10%	Resistant	Resistant
Nitric acid, HNO₃	40% and above	Not recommended	Not recommended
Acetic acid	Up to glacial	Resistant	Resistant
Sodium hydroxide, NaOH	Up to 60%	Resistant	Resistant
Potassium hydroxide, KOH	Up to 50%	Resistant	Resistant
Ammonia solution	Up to 10%	Resistant	Resistant
Brine, salt solutions	Saturated	Resistant	Resistant
Hydrogen peroxide, H₂O₂	Up to 28%	Resistant	Limited
Sodium hypochlorite	Bleach strength	Limited	Not recommended
Chlorine dioxide, chlorine water	Any	Not recommended	Not recommended
Aromatic and chlorinated solvents	Pure	Not recommended	Not recommended

Indicative ratings for unstressed polypropylene from published resistance data. Pressure, temperature, concentration and mixtures all change the result, so send us your medium and service conditions and we confirm each line in writing before you specify.

Jointing

The joint matters most in chemical service

A butt-fusion bead is more than a pressure loss. It is a ledge for solids, scale and crystallising salts to build on, at every joint, for the life of the line. Electrofusion leaves nothing for them to hold on to.

Butt fusionMolten material is pushed into a ring inside the bore at every joint, and stays there for the life of the line.

Anjney electrofusion, 200 to 630 mmA coil moulded into the fitting fuses pipe and fitting inside the socket. The bore runs straight through.

Size	Jointing	How it is made
20–200 mm	Socket fusion	Pipe and fitting heated on a mating tool and pushed home. Fast and tool-controlled.
200–630 mm	Electrofusion	Machine-controlled fusion cycle set by the fitting, so every joint is made the same way, independent of the fitter.

PPH against the usual alternatives

From the Anjney PPH brochure.

Parameter	Anjney PPH	SS / MS / GI	PVC / CPVC	HDPE
Corrosion	None	Pits and scales in acid, chloride and brine	None	None
Alkali resistance	Excellent	Poor to moderate	Moderate	Excellent
Stiffness	Highest in the PP family	Very high	High but brittle	Low, needs more supports
Impact behaviour	Tough, does not shatter	Ductile	Brittle, cracks on impact	Tough
Jointing	Socket fusion and electrofusion	Welded or threaded	Solvent cemented	Fusion welded
Weight	Light	Heavy	Light	Light
Maintenance	Near nil	Recurring	Low	Low

Where PPH is used

Specified where the medium is aggressive, the duty is continuous, and replacing the line means stopping production. It is a chemical-service pipe, not a general water-utility pipe.

Chemical processing

Acid and alkali transfer, dosing and metering, reactor feed and discharge, scrubbers, tank-farm manifolds and bund drains.

Typical media: HCl, dilute H₂SO₄, NaOH, KOH, brine

Chlor-alkali and inorganics

Caustic handling, brine circuits, cell-room headers and acid dilution lines.

Typical media: Caustic soda, brine, dilute acids

Steel pickling and acid regeneration

Pickling-line headers, rinse cascades, spent-acid transfer, HCl regeneration and fume-scrubber duty.

Typical media: HCl pickling liquor, spent acid, rinse

Solar PV manufacturing

Wafer cleaning, alkaline texturing feed and drain, post-etch rinse, and segregated acid and alkali drains.

Typical media: KOH and NaOH texturing, dilute HF, H₃PO₄

Metal finishing and plating

Pickling and anodising tank lines, plating-bath circulation, rinse cascades and phosphating circuits.

Typical media: Pickling acid, plating baths, H₃PO₄

Pharmaceutical and API

Reagent transfer, chemical dosing, neutralisation lines and corrosive drains from API blocks and QC laboratories.

Typical media: Reagent acids, caustic, corrosive drains

Fertiliser and agrochemicals

Phosphoric and dilute sulphuric acid circuits, ammoniacal liquor, slurry and dosing lines.

Typical media: H₃PO₄, dilute H₂SO₄, ammonia solution

Effluent, ETP and ZLD

Segregated acidic and alkaline effluent headers, neutralisation, dosing, MEE and ZLD concentrate transfer.

Typical media: Mixed acid effluent, fluoride-bearing streams

Chemical and laboratory drainage

Corrosive process drains, laboratory waste, trench and floor drains, vent stacks and below-ground collection.

Typical media: Lab waste, acid drains, vents

Also used in battery and electronics manufacturing, semiconductor support chemistry, tannery effluent, galvanising, pilot plants, acid filling stations and chemical tank farms. Every medium is confirmed against your concentration and temperature first.

PPH pipes and fittings

Item	Range
PPH pipe, single wall	20–630 mm, PN 10, 16, 20
Coupler	20–200 mm
Elbow 90°	20–200 mm
Elbow 45°	20–200 mm
Long radius elbow	20, 32, 50, 63 mm
Equal tee	20–200 mm
Reducing tee	20–200 mm
Reducer	20–200 mm
End cap	20–200 mm
Electrofusion coupler	200–630 mm
Electrofusion elbow 90°	200–630 mm
Electrofusion equal tee	200–630 mm
Electrofusion core flange	200–630 mm
Core flange (stub end, collar)	20–200 mm
Step flange (backing ring)	20–630 mm
Branch adaptor	All relevant sizes

We provide fitter training, jointing procedure sheets and commissioning support. Send the line schedule and layout and we size the network and mark up joint positions with you.

See PPH fittings with drawings

Grey PPH chemical lines on a pipe rack — Chemical lines on a rack

PPH lines running in a trench — Trench run

PPH header with valves on a wall — Header with valves

PPH questions

What is PPH pipe?

PPH (also written PPH) pipe is made from polypropylene homopolymer, the stiffest and most chemically resistant grade of polypropylene. Anjney PPH is a single homogeneous wall made to EN ISO 15494, in 20 to 630 mm and PN 10, 16 and 20.

What is the difference between PPH and PPR or PPRCT?

PPH is a homopolymer chosen for chemical resistance and stiffness, and is used for acids, alkalis, chemical drains and effluent. PP-R and PP-RCT are random copolymers designed for hot and cold water under pressure. Anjney uses PPRCT for water utilities and PPH for chemical service.

Which chemicals can PPH carry?

Most acids, alkalis and salts, including hydrochloric acid, dilute sulphuric and nitric acid, phosphoric acid, caustic soda and brine. Strong oxidisers such as hypochlorite and chlorine dioxide, concentrated sulphuric and nitric acid, and aromatic or chlorinated solvents are not recommended. See the guide above, then send us your medium for written confirmation.

What temperature can PPH handle?

Typically 0 °C to +80 °C continuously and up to about 100 °C for short periods, with allowable pressure falling as temperature rises. The real limit depends on the medium, its concentration and the pressure together.

Why electrofusion and not butt fusion?

Butt fusion pushes a bead into the bore at every joint. In chemical service that bead becomes a ledge for solids and crystallising salts and a crevice where chemicals concentrate. Electrofusion fuses inside the socket and leaves the bore clear. Anjney does not supply PPH on butt fusion.

Which fittings are available in PPH?

Socket fusion couplers, elbows, tees, reducers, end caps, long radius elbows and core flanges from 20 to 200 mm; electrofusion couplers, elbows, tees and core flanges from 200 to 630 mm; backing rings from 20 to 630 mm and branch adaptors. See all PPH fittings.

PPH downloads

Enquiry

Send us your line schedule

Tell us the service, pipe sizes and approximate run lengths. Our technical sales team sizes the network and returns a bill of material, with an installed-cost comparison against your current specification.