Executive Summary: Pakistan’s national standards (PS) and regulatory codes for piping systems are issued mainly by PSQCA (Pakistan Standards & Quality Control Authority) and sector regulators (OGRA for oil/gas pipelines). PSQCA has Pakistani Standards (PS) for various pipes – e.g. PVC-U (PS:3051-2017), PE (PS:3580-2014), PP (PS:4533-1999) – which mostly adopt international norms (ISO, BS, DIN). However, in many areas (steel pipes, ductile-iron pipes, threaded fittings, most valves, instrumentation) Pakistan lacks specific PS, so industry defaults to international standards (ASTM/ASME, API, DIN/ISO, BS). OGRA’s gas pipeline code (Gazette 2004) formally mandates e.g. API 6D for valves and ASME B16.1 for cast-iron flanges¹. Similarly, the Sui gas network code requires calibration per the AGA Gas Measurement Manual (Parts 8/13/15)². The Pakistan Engineering Council (PEC) does not issue standards but recognizes PSQCA standards. In summary, Pakistan’s pipeline standards landscape is a mix of a few PS for plastic pipes and valves, supplemented by international standards in most categories. The following report details (by component/material) the PS numbers and titles, their scope and key requirements, and corresponding international equivalents, with gaps noted. We also provide comparative tables, a mapping diagram, and QA/QC checklist templates.

1. Regulatory Bodies & Framework

• PSQCA (Pakistan Standards & Quality Control Authority): The apex body for Pakistani Standards (PS). It publishes PS standards and certifies products. Technical committees (e.g. BDC-6 “Builders’ Hardware & Sanitary Fittings”) develop standards for pipes and valves (e.g. PS 3580, 3051, 4533)³⁴. PSQCA Act (1996) makes many PS mandatory for manufacturing (e.g. household gas valves, LPG cylinders), but most piping PS are voluntary. PSQCA requires adoption of international references (e.g. PS 3580 was based on ISO 4427⁵).
• PEC (Pakistan Engineering Council): A licensing body; it references PSQCA standards in designs but issues no piping standards.
• OGRA (Oil & Gas Regulatory Authority): Regulates transmission pipelines. OGRA’s Gas Transmission Technical Standards (Gazette Aug 9, 2004) incorporate international norms. For example, for transmission pipelines OGRA requires “each valve must meet API 6D or equivalent” and cast-iron pipe flanges to meet ASME B16.1¹. OGRA also has separate technical codes for LNG facilities, but these focus on contractual/safety terms rather than new technical specs.
• Sector Ministries/Utilities: No separate national “pipe codes” by water or oil ministries are widely published. Some utility tender documents reference PSQCA or British Standards. Notably, the Pakistan Gas Network Code (for SNGPL/SSGC) mandates calibration per the AGA Gas Measurement Manual (Part 15 for electronic correctors)², reflecting use of U.S. standards.

2. Pakistani National Standards (PSQCA) by Category

2.1 Pipes

• Carbon Steel Pipes: No specific PS for generic steel pipes. (PS:3644-1995 and PS:3645-1995 cover steel tubes for “mechanical purposes”, but no PS covers e.g. API 5L line pipe or ASME B36.10/19 pipe dimensions.) Practice: Use ASTM A106/A53, API 5L, ISO 3183, EN 10255/10216 as applicable. Gap: No PS – rely on internationally used standards in oil/gas and water sectors.
• Stainless Steel & Alloy Pipes: No Pakistan-specific PS. Industrial users use international standards (e.g. ASTM A312 for SS, ASME B36.19 for stainless pipe dimensions) or Indian/Chinese standards.
• Ductile Iron Pipes: No Pakistan standard. Sewage/water utilities may refer to British/EN (e.g. EN 545/598, ISO 2531) or American (AWWA C151/A21.51) norms.
• Copper Pipes: No PS. Commonly use ASTM B88 (plumbing) or EN 1057.
• PVC Pipes (Unplasticized): PS 3051-2017 (Rev.) – “PVC-U Pressure Pipes for Cold Potable Water.” Scope: Specifies PVC-U (DR PM, pressure classes) pipes ≤24″ (600 mm) for potable water at up to 6–15 bar (depending on size)⁴. Adopts test methods (e.g. ISO 9852). Based on BS 3505:1986⁶. Key Requirements: Material (PVC formulation with ≤5% additives, specific gravity ~1.44⁷), wall thickness tolerances, hydrostatic strength tests (Appendices). Pressure classes A–E defined by min. sustained pressure (6,9,12,15 bar)⁸. Outer dimensions comply with PS:1767 (ends test)⁹. Applicability: Municipal and household cold water.
• HDPE (Polyethylene) Pipes: PS 3580-2014 – “Plastic Piping Systems – PE Pipes & Fittings for Water Supply.” Scope: PE pipes (Types I & II per ISO 4427) for water (human consumption) up to 25 bar MOP¹⁰. References ISO 1167 (pressure tests). PS3580 covers materials (PE100, PE80 grades), dimensions, hydrostatic tests, coloring, marking. Based on ISO 4427-2:2007-08⁵¹⁰. Note: First PS3580 was 1997; revised 2014.
• PP (Polypropylene) Pipes: Two PS exist:
  
  • PS 4533-1999 – “Types 1,2,3 Polypropylene (PP) Pipes – Quality Requirements and Testing.” Scope: Specifies general quality & test methods for seamless PP pipes (homopolymer PP-H type1, impact copolymer PP-B type2, random copolymer PP-R type3)³. References include DIN 8077 (dimensions), ISO/IEC standards. It covers raw material specifications, dimensions, mechanical properties, creep/pressure tests. (The foreword cites DIN 8078 as basis¹¹.) Applications: Sanitary, plumbing.
  • PS 4534-1999 – “Polypropylene (PP) Pipes – Dimensions.” Specifies dimensions/tolerances for PP pipes (PP-H100) per DIN 8077. (Exact text not public, but this standard defines OD, wall thickness, tolerance tables, maximum working pressures.)
• Other Plastic Pipes:
  
  • ABS, CPVC, etc: No PS; international standards like ASTM D1785 (PVC), ASTM F441 (CPVC), ISO 1401, DIN 8062 (PPR) apply.
• Notable PS Withdrawn: PS 911-1972 (cast-iron pipes/fittings) was withdrawn (replaced by PS 3048-1991 for CI pipes). PS 1838-1987, PS 1839-1987 cover steel socket/tube threads to PS:1574, but obsolete.

2.2 Fittings (Welded/Threaded/Flanged/Forged)

Pakistani PS: None specifically for general pipe fittings. (PS 3048-1991 covers CI pipe joints, but not commonly cited.) Old thread PS (1838/1839) and a CI fitting PS (911/3048) are outdated.

International Standards:

• Butt-Weld Fittings: ASME B16.9 (butt-weld fittings CS, SMLS, ⅛″–48″), EN 10253/DIN 2605, ISO 5251.
• Socket-Weld Fittings: ASME B16.11 (socket-weld and threaded forged fittings).
• Threaded Fittings: For NPT/PF threads, ISO 7/1 or ASME B1.20.1 (NPT) for tapered threads; ISO 228-1 (BSPP) or DIN 2999 where used. (PSQCA PS:1838/9 only covered steel threads decades ago.)
• Flanged Fittings: ASME B16.5 (flanges & flanged fittings, ½″–24″, classes 150–2500), B16.47 (NPS 26–60). Cast-iron flanges per ASME B16.1 (OGRA cites B16.1 for CI flanges¹²). ISO 7005 or EN 1092-1 sometimes used.
• Forged Fittings/Unions: ASME B16.11 (socket, threaded) and ASME B16.26 (flanges up to 48”).

Key Notes: No PS creates a gap: Pakistan relies on adopted international or vendor standards. For potable water/drainage fittings, CE-marked (EN 1452) PVC fittings or ISI-mark (India) are often used.

2.3 Valves

• PS 4020-1997 – Bronze Gate/Globe/Angle/Check Valves: Issued by PSQCA, covers “globe, bronze gate, angle and check valves” for general mechanical equipment¹³. Likely sizes up to some inch, general duty. (It is the only valve PS found.)

  • Scope: Bronze body valves (3/8″–?), for water/fuel, general use.
  • Tech Req’s: Material (gunmetal bronze, etc.), dimensions, pressures (often up to 10 bar), leak testing. (Detailed clauses not publicly available.)

• PS 4021-1997 – Valve Glossary: Terms/definitions for valves.

• PS 2970-1991 – Industrial Valve Testing: Specifies hydrostatic and seat tests for industrial valves (shell and seat leakage tests)¹⁴.

• PS 2972-1991 – Valve Actuator Attachments: Defines flange dimensions and torque for multi-turn actuators (parts 1–3)¹⁵.

• PS 2969-1991 – Valve Marking: Defines mandatory/optional markings for industrial valves (type, pressure rating, serial no, etc.)¹⁴.

International Standards: In practice Pakistani industry uses international valve standards. Key examples:

• Gate/Globe/Check Valves (Metallic): API 600 (steel gate/globe valves), API 602 (small steel), API 602 (globe as well), ISO 5752 face-to-face, MSS SP-25 for marking. Cast iron gate/globe: EN 1074 or AWWA C509 (when used). OGRA mandates API 6D for pipeline valves (e.g. steel gate)¹.
• Ball Valves: Full-port forged ball valves per API 608 or ISO 14313; smaller sizes: ASME B16.34. Common at 600–1500 lb.
• Butterfly Valves: ISO 5752/PN standards, API 609 (metal-seated). EPDM/PTFE lined for general service.
• Check Valves: API 594 (wafer check), API 6D (axial flow check), BS 1873.
• Control Valves: No PS; ISA/IEC 60534 series (for valve sizing); IEC/EN valve actuator standards.
• Safety/Relief Valves: API 520/521 (sizing), API 526 (bellows safety valves), ASME/ANSI PTC 25.1. Pilot or spring valve: API 526 nozzle sizes, ISO 4126 series (safety valves general). Pressure vessels require valves per ASME Boiler Code Sec. VIII (PSV design).

Notes: In OGRA pipeline code, safety valves (in compressor stations) must be certified to API standards. The Pakistan Petroleum Exploration & Production Policy requires oilfield relief valves per API 526/520. PSQCA does not issue PS for these valves.

2.4 Instrumentation (Pressure, Temperature, Flow, Level, Transmitters, etc.)

Pakistan has no specific PS standards for most instrumentation devices. Industry follows international electrical/mechanical instrument standards or calibration norms:

• Pressure Instruments (Gauges, Transmitters): Widely use Bourdon gauges to ASME B40.100/ISA calibration; analog gauges often CE-marked (EN 837 series). Pressure transmitters follow IEC/ISA standards (e.g. IEC 60770 “Output signal of pressure-transducers”/4–20mA specs, IEC 60068 tests).
• Temperature Instruments (Thermocouples/RTDs): Sensors per IEC 60584 (thermocouple tolerances) and IEC 60751 (Pt100 RTD specs). Temperature gauges as per EN 13190 (oil/mercury tests). No PS exists.
• Flow Meters: No PS; orifice meters follow ISO 5167 series (even OGRA pipeline code assumes ISO 5167/AGA for orifice measurement). Ultrasonic/PD/turbine meters: international specs (e.g. ISO 17089 for ultrasonic). Gas flows often by AGA/ISO.
• Level Instruments: Float gauges to BS EN 13306; radar/ultrasonic to IEC 61508 (functional safety) and IEC 60079 (hazardous area).
• Transmitters/Controllers: Follow IEC 60584, IEC 61158/61226 for fieldbus, etc.
• Tubing & Fittings (Instrumentation lines): Stainless instrument tubing typically ASTM A269 (for SS316) or DIN 2491, usually 1/8″–1/4″ OD. Compression fittings from Swagelok/ISO 8434-1. No PSQCA standards.
• Calibration & Installation: PSQCA mandates many calibration services to be ISO/IEC 17025 certified (for weights & measures labs). Notably, the Pakistan Gas Network Code requires calibration of electronic pressure/temperature correctors per the AGA Gas Measurement Manual, Part 15 (electronic flow computers/volume correctors)². In absence of PSQCA calibration specs, laboratories use NIST/ASTM procedures or ISO 17025 lab accreditation.

Summary: For instrumentation, compliance is through recognized IEC/ISO/API/AGA standards. This covers flow computers, transmitters, instrumentation tubing, and calibration procedures.

3. International Standards Commonly Used in Pakistan

Pakistan largely adopts or practices international standards by reference. Important mappings include:

• Pipes: Steel pipes – use ASTM A106/A53, API 5L, ISO 3183, ASME B36.10/B36.19. Cast/ductile-iron – AWWA/EN; PVC – ISO 1452/BS 3505; PE – ISO 4427/PE100; PP – ISO 8077/8078 (dimensions/testing)³⁵. Water utilities often specify BS/EN.
• Fittings: Flanges – ASME B16.5 (CSA), B16.47 (large), BS EN 1092-1. But OGRA pipeline uses ASME B16.1 for cast-iron flanges¹². Welding fittings – ASME B16.9, socket-weld ASME B16.11. Threaded – ASME B1.20.1 (NPT).
• Valves: Gate/Globe – ASME B16.34, API 600/602; Butterfly – BS 5155/API 609; Check – API 594/BS 1868; Ball – API 608; Safety – API 520/521/526. OGRA explicitly cites API 6D for line valves¹.
• Instrumentation: Pressure gauges – EN 837 series; pressure transmitters – IEC 60770; flow – ISO 5167 or AGA; level – IEC/ATEX; calibration – ISO 17025/NIST.

Where Pakistan PS exist, they explicitly incorporate these. E.g. PS 3580 cites ISO 4427, PS 3051 cites BS 3505⁶⁵. For components lacking PS, project specs typically list ASME/API/ISO references.

4. Consolidated Standards Comparison Table

Notes: Entries with “(no PS)” indicate a lack of a Pakistani standard, so international equivalents are used by default. (PS lines like PS1838/39, 3048, 4020 appear in PSQCA catalogs but are limited in scope.)

5. Gaps & Substitutions

• Steel Pipes: Pakistan has no PS for carbon steel pipes (conveyance or boiler tubing). Hence pipelines and plants specify ASTM/ASME/API/EN. Substitute: API 5L or ASTM A106/A333 (seamless) are common. OGRA’s code indirectly endorses API for valves.
• Ductile Iron: No PS – municipal specs reference EN 545/598 or AWWA. Many contractors use old BS 1211 or Indian specs.
• Threaded Fittings: The old PS 1838/1839 cover only screwed steel tube ends (1970s, now outdated). Modern practice is NPT/BSP standards.
• Valves (most types): Except PS 4020 for bronze valves, Pakistan has no national standards for gate/globe/ball/zone valves. Industry uses API/BS. Substitute: API 600/602 (gate, globe), API 594 (check), ISO 5211 (flange mounting), etc.
• Instrumentation: No PS standards. Gas utilities substitute AGA manuals (US-based). For other sectors rely on ISO/IEC.

6. Standards Mapping Diagram

Figure: Entity-relationship diagram showing selected Pakistani Standards and their international equivalents (arrows indicate adoption/influence). For example, PS 3580-2014 is based on ISO 4427⁵; PS 3051-2017 draws on BS 3505⁶; OGRA pipeline valves must meet API 6D¹.

7. QA/QC Compliance Checklists

Below are checklist templates to guide procurement and QA/QC inspections. These should be tailored to project specifications and the applicable standards.

• Pipes (Carbon Steel/Stainless/Alloy):

  • Verify material certificates (mill test certificates) against specified grade (e.g. ASTM A106 Gr.B).
  • Check dimensions (OD, wall thickness) per ASME B36.10/B36.19 tolerances.
  • Confirm welding procedure spec (WPS) for welds (if butt-weld pipes) or seamless manufacturing method.
  • Review NDT reports: radiography or UT on joints, PMI for chemical composition, hardness tests.
  • Verify hydrostatic test reports (per API 5L/ASTM A106), yield/tensile if required.
  • Ensure marking/traceability: pipe stamps (size, grade, heat no.) exist.
  • Inspect coating (if specified, e.g. epoxy), thread quality (if coated), and gasket compatibility for flanges.

• Plastic Pipes (PVC/PE/PP):

  • Check PS/ASTM/ISO compliance: pressure class rating (e.g. PN16), material grade (PE80/PE100).
  • Review Type Test Reports: e.g. hydrostatic sustained-pressure tests (ISO 1167), dimension check (caliper on OD & ID).
  • Confirm color/UV stabilization additives per spec (often blue/yellow for potable).
  • Inspect joint fittings: fusion joints per ISO 21307 or manufacturer procedure; gasket joints per PS:1614 (O-ring materials).
  • Manufacturer certification (PSQCA mark or ISO 9001) and batch lot numbering.

• Fittings (Welded, Socket, Flanged):

  • Verify ASME/ISO standard compliance (e.g. B16.9 for weld fittings: wall thickness ≥ pipe minus schedule).
  • Inspect radiography of welded fittings (if critical service).
  • Check flange drilling (ASME B16.5): bolt circle, dimensions, flatness of faces.
  • Threaded fittings: gauge threads (NPT, BSP) for fit, and ensure galvanizing/finish per spec.
  • Forged fittings: material (through-hardness test if required), heat treatment certificate.

• Valves (Gate/Globe/Ball/Butterfly/Check/Safety):

  • Confirm valve type & design matches spec (material, pressure class, temperature rating).
  • Review manufacturer test certificates: shell test, seat leak test (per API 598/520/BS EN12845).
  • Material mill certificates for body, trim, seating material.
  • Dimensions: face-to-face, end connection size (flange rating or thread type).
  • Functional check: for safety valves, verify set pressure & tolerance, include calibration certificate.
  • Marking: valve tag should show manufacturer, serial no., size, pressure rating, spec (as per PS 2970 marking rules).
  • Certificate of compliance (ensures API/BS/MSS standards adherence).

• Instrumentation (Sensors, Tubing, Control Valves):

  • Sensors: verify calibration certificates (traceable to NIST or NABL labs) for pressure/temperature transmitters.
  • Check compatibility of instruments with fluid (wetted material compatibility) and electrical ratings (IECEx, UL, etc.).
  • Flow meters: ensure meter factor calibration report, line sizes, straight-run installation lengths.
  • Tubing/fittings: confirm material (316SS etc.), dimension (outer/inner diameter), and that fittings match tubing (flare/tube OD).
  • Installation: follow manufacturer’s orientation; verify leak test on instrument tubing (e.g. pneumatic/helium).
  • Control valves: verify actuator calibration (bench test for stroke vs signal), install per IEC 60534.
  • General: check instrument air/nitrogen quality certificates (dryness for pneumatic systems).

Each checklist item should be documented (initialed/photographed) and cross-referenced with the project’s technical specification (which should cite the relevant PS or international standard).

Sources: Authoritative standards and regulations as cited above.