131bellow sealed valves spec s

8/12/2019 131bellow Sealed Valves Spec s

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National Aerospace Laboratories,Bangalore 560 037

Sep - 07

Specifications of BellowSealed Manual Globe Valves


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Specifications for Manual Valves (Bellow sealed)

Item Details

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10.

11.

Type

Operating

Medium

Pressure

Temperature

Size

Actuation

Application

Pattern

Permissible leak rate

across body


from atmosphere to

jacket in case of

vacuum-jacketed

globe valves


across seat

End Connections

Style of construction

Globe

GH2

# 900 ( PN 150)

15 C (Min); 30 C (Nominal); 50 C (max)

50 mm & 25 mm

Hand Operated (Manual)

Isolation; a) Main line

Bellows Sealed

1E-08 mbar-l/s for bellows sealed globe valves

1E-08 mbar-l/s

1E-05 mbar-l/s for resilient seated globe valves

Butt welded ends to ANSI B16.9/ 16.24 for all the sizes

considered here.

With full port (standard bore) and inline end

Connections


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12.

13.

14.

15.

16.

17.

18.

19.

20.

Bonnet (globe valve)

Stem

Stem (dynamic seal)

Plug

Seat

Flow Direction

Material ofconstruction

Body & Bonnet

Stem, plug &seat

Bellows

Gland Packing

Plug, Seat Packing

Bolted or screwed to body with spring energized seals

(Helicoflex, Enerseal, etc.)

Rising stem with outside screw and yoke (OS & Y)

pattern

By bellows with redundant gland packing for globe

valves of GH2 media.

Renewable (replaceable) from stem

Renewable from body with seat insert

Flow to open (for globe valves)

ASTM A 182 F 304L/ 316L or

ASTM A 351 CF 3/ 3M

ASTM A 479 304L/ 316L

Stainless steel 316L / 321/ Haste alloy C 276/ Inconel

600/ 625

PTFE

PTFE / Kel-F or equivalent


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21.

22.

23.

24.

Bolts

Nuts

Design Code

Test Code

ASTM A 193 B 8

ASTM A 194 8

BS 5352/ BS 6364/ API 6-D/ ANSI B 16.34

BS 6755/ API 598

The valves shall be either inherently anti-static or provided with anti-static

features.

The valves shall be of fire safe design as per BS 6755 Part 2 or API 607.

Quantity required :

50 mm : 4 No.

25 mm : 3 No.

Tag No for 50 mm : MV 201, MV 202, MV 203 and MV

Tag No. for 25 mm : Nil

Tests for Manual Bellows sealed Valves:

Certificates:

All the certificates including material certificates, detailing the physical and

chemical properties, of the principal pressure-bearing parts shall be

provided along with the drawings and catalogs.

Bellows cyclic life test:

3 sample bellows drawn from a batch of the same size and type shall be

subject to (destructive) cycle life (proto-type) test as per BS 5352. If the

manufacturer of bellows has already performed such test, copy of thecertificates may be produced.

Batch test certificates are acceptable.

Welding joint test:

Any butt & socket welding joints in the valve shall be subject to

radiographic tests with X-rays to 2-T sensitivity.


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Soundness test for casting:

All the castings shall be subjected to soundness test with radiographic or

ultrasonic technique for flaw detection.

Hydraulic shell pressure test:

The valve, prior to assembly with the bellows, in partially open position,

shall be subjected to pressure test with H2O (with suitable corrosion

inhibitor) at 1.1 times the maximum rated working pressure of the particular

pressure rating class of the valve. The test procedure and acceptance

criterion shall be as per BS 6755, Part 1 or API 598 or ANSI B 16.34

Hydraulic seat pressure test:

The valve, in closed position, shall be subject to pressure test with water

(with suitable corrosion inhibitor) at 1.1 times the maximum rated working

pressure of the particular pressure rating class of the valve. The testprocedure and the acceptance criterion shall be as per Rate A of BS 6755

Part 1 or API 598 or ANSI B 16.34.

Pneumatic pressure test:

The valve, upon final assembly including the bellows, in partially open

position, shall be subjected to the pressure test by dry air or GN2 at 1.1 times

the maximum rated working pressure of the particular pressure rating class

of the valve. The test procedure and acceptance criterion shall be as per Rate

A of BS 6755 Part 1 or API 598 or ANSI B 16.34

MSLD seat leak test:

The global leak rates across seat shall be measured with GHe MSLD to

establish leak tightness values, specified above by hood technique as per

article 10, section 5, ASME. The leak tests shall be performed by

pressurizing the inlet with Helium gas, and by evacuating and connecting the

outlet to MSLD. Leak test by detector probe or tracer probe technique is not

acceptable.

Functional Tests:The valve with all accessories mounted shall be subjected to functional test

to validate the performance.


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Cleanliness:

All the interior flow surfaces of the valve shall be degreased and cleaned to

O2 service standard as per CGA G-4.1 or MIL-C-52211.

Marking:

All the valves are assigned tag numbers for the sake of identification. The

tag number for each valve, as indicated above besides size, pressure rating

class, material of construction etc., shall be legibly and indelibly engraved

on the body of the valves.

GUARANTEE AND WARRANTY

The supplier shall give warranty for 2 years from date of supply for

replacing/ repairing of valves and their accessories, from any kind of defect,

material or workmanship or malfunctioning within 48 hours of observing the

defect. The supplier shall give performance guarantee for smooth troublefree operation of valves as per functional requirements for two years from

date of supply.

Flow Conditions:

Pressure class #900 (PN 150)

Medium: Gaseous Hydrogen

Pressure (bar) Temperature (C)Sizemm Max Min Flow rate(Max)

Kg/secMax Min

50 150 50 0.2 50 15

25 150 10 0.1 50 15

Valve sizing must be based on maximum flow rate at minimumpressure


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TERMS AND CONDITIONS

1. YOU ARE REQUESTED TO QUOTE AS PER SPECIFICATIONS.

2. PAYMENT AS PER CLAUSE NO. 12 ON THE REVERSE OF RFQ. NO

REQUEST FOR ADVANCE PAYMENT WILL BE ENTERTAINED.

3. NAL IS EXEMPTED FROM PAYMENT OF CUSTOMS DUTY, CENTRAL

EXCISE DUTY.

4. KINDLY MENTION WARRANTY DETAILS IN YOUR QUOTATION.

5. KINDLY MENTION TIN/CST NUMBER IN YOUR QUOTATION AND

ENCLOSE COPIES OF CERTIFICATES.

6. EMPLOYEES STATE INSURANCE & INCOME TAX WILL BE RECOVERED

WHEREVER APPLICABLE.

7. SUPPLIER SHOULD SUBMIT TENDERS IN TWO PARTS, VIZ.TECHNICAL BID AND COMMERCIAL BID SEPARATELY IN TWODIFFERENT SEALED COVERS. THE SEALED COVERS SHALL BESUPERSCRIBED WITH THE NATURE OF BID (TECHNICAL ORCOMMERCIAL), TENDER NUMBER. THE SAID TWO COVERS SHALL,

THEN BE PUT TOGETHER INTO ANOTHER COVER WHICH SHALL BESEALED AND SUPERSCRIBED WITH THE NAME OF THE TENDER,

TENDER NUMBER AND THE DATE OF OPENING OF THE BID.

8. THE SUPPLIER HAS TO SUBMIT ALONG WITH THE TECHNICAL OFFERTHE EARNEST MONEY DEPOSIT (EMD) OF RS. 35000/-(RUPEESTHIRTY FIVE THOUSAND ONLY) OR EQUIVALENT BY WAY OFDEMAND DRAFT OR BANK GUARANTEE FROM A SCHEDULED BANK,WHICH SHOULD BE VALID FOR AT LEAST ONE YEAR FROM THE DATEOF YOUR QUOTATION, DRAWN IN FAVOUR OF DIRECTOR, NAL,BANGALORE. HOWEVER, GOVT. PUBLIC UNDERTAKINGS & FIRMSREGISTERED WITH DGS & D, AND NSIC ARE EXEMPTED FROMPAYMENT OF EMD, AS PER THE RULES PREVAILING FROM TIME TO

TIME, IF THEY ARE THE MANUFACTURERS OF THE ITEM/MATERIAL

OFFERED. EMD WILL BE FORFEITED IF THE SUPPLIER FAILS TOCOMMENCE / COMPLETE THE WORK WITHIN STIPULATED TIME IFASSIGNED

9. PERFORMANCE BANK GUARANTEE HAS TO BE SUBMITTED FOR 10%

VALUE OF THE PURCHASE ORDER VALID TILL 60 DAYS AFTER THE

WARRANTY PERIOD OR HAVE TO AGREE FOR DEDUCTION OF THE 10%

VALUE FROM YOUR BILL.


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131bellow sealed valves spec s

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