Check list for DesignGeneral

-Out of scope for Design and Drawing

-Div.1 & Div.2 applicability

Depend on pressure, temperature, harzedeous content, angle, size etc

Material suitability

-Blind flange Jack screw holes consider in design

-UG-44(i)

Design Data

-check applicable year of code and addenda in design data,applicable codes and standards table

-units of measurement as per client requirement

-check metric units in input data if applicable

-check “use current material database” input data

-external load for nozzle-remove if not applicable

-add MAEWP when external pr.applicable

Element-like cone etc

A) Service-PWHT, Impact test reqd-Special conditions and necessary implementations -PWHT conditions and necessary implementations -Impact test conditions and necessary implementations-Impact tested (low temperature service) materials and it’s applications-Head long seam joint type & efficiency as per UG-116

-Check for lethal service, PWHT and impact testing requirement

-Above 20 ppm H2S is lethal SORF not to be used

-Nitrogen gas is not lethal and PWHT not required

-Impact tested materials

-Materials for different service

- Materials for different pressure and temperature

-Check UCS-66 & Fig UCS-66,reduced MDMT

-Minimum thick for different application—eg air, steam, water, acid. etc

-Provided thickness as per client spec & Size availability in market

-Mill tolerance consideration while giving minimum thickness-UG-

-Cone angle ---as per Div.1 ,Div.2

-Hydrotest position and it’s corresponding description and value in design data ,input data and in internal pressure calculation

-UG-99 (b) foot note (34) instead of UG-99(b)(34) for Design= MAWP condition hydrotest.

-insert plate width as per WRC-368

Minimum width is the greater of

1.65*Sqrt(R*T) and d/2

Where,

R-mean radius of parent shell/head

T- thickness of parent shell/head

d-Nozzle Mean Diameter

-avoid plug holes in dish inline with support pipe centerline for vent purpose while welding support pipe otherwise support pipe should checked for external pr.as atm pr as internal pr.and vessel int.pr.as external pr.

-check joints in dish for bigger size diameter vessels

- before finalizing dish thickness, nozzle thk and r.f pad requirement check

in WRC for nozzle in head for forces and moment use resultant method if applicable

-similarly for element thk check platform and ladder load and it’s WRC if applicable

-For Fibre elongation knuckle radius

Elliptical Head

K.R=(Dish ID * 0.17)+ (Nom THk/2)

Torishpherical Head

K.R=(Dish OD * 0.1)+ (Nom THk/2)

-Volume

6% Torispherical-0.0846 D3

10% Torispherical-0.1 D3

2:1 Elliptical-0.1309 D3 or (0.1313 D3)

Hemi sphere=(pi/12)*D3

Elliptical=(pi/24)*D3

Area

Hemi Sphere = (Pi/2) * D2

2:1 Head=1.084 * D2

Tube sheet

-for filters strainer plate calculation and it’s support pipe calculation

-strainer plate support clip design if applicable

-check differential pressure for filter

-Tube sheet ligament efficiency

-tube sheet thickness (t)= sqrt(6M/fb)

Moment (M) =Ring width * Dirt Load

fb-allowable bending stress,0.66 * yield

Lining, insulation,content

-check weight, insulation & lining to be considered in corresponding conditions like empty, operating and hydrotest and in drawing also proper weight to be shown, particularly for lifting crane requirement selection.. (for type load whether it is considered as welded internals or some other mean)

-Lining and Insulation applicable and it’s Density

-content level and it’s density

Inspection opening

-Inspection opening as per UG-46

-check drain in a vessel

-check suitability for hydrotest as per the selected position(for drain,air lock prevention etc)

-manway quick opening closure calculation

Nozzles

-Fillet leg size as per code UW-16

-Fillet leg size = Throat * 1.414

-Throat= 0.7 * (6 mm or smaller of thickness of the joining two joining parts)

-Nozzle joint type as per UG-40 and UW-16 and as per drawing(notation, schedule, rating, projection etc)

-Studding outlet blind flange design

-Flat Head, Studding outlet threaded hole min.depth as per UG-43(UG-43 table min. no. of thread engaged)

-Studding outlet id and size to be check as per position

-Design of Nozzle passing through blind flange

-Design of blind flange having nozzle opening in it

-Hub Nozzle Bevel angle minimum 30 degree (Use 45 degree),Refer fig UG-40(e)(e-1)(e-2)

-Hub Height= Hub Thk * 2.5

-Bevel Height= Hub Thk-Neck Thk (for 45 Degree)

-Bevel Height = (Hub Thk-Neck Thk)/tan 60degree (For 30 Degree)

-Nozzle comes in blind flange use UW-16 (q) config or check weld for more than 38 mm then PWHT needed.

-check Nozzle offset distance in head to avoid in Knuckle portion and high membrane and bending stress

-APP L-7.7.7(b) Nozzle hill side D/2h varies depend on offset & corresponding k Value as per UG-33.1 table for head changed and area reqd and availability changed

-Nozzle opening ratio and refer UG-39

-APP-1-10 done only in shell not in head even 2” nozzles it is performed along with UG-37.1 Calc.

-For Ext.Noz.Load 31.3 Calc for stress Performed

-WRC requirement for applicable nozzles

-Fatigue analysis

-Coupling calculation with thk as per B16.5 table -5 min.thk and projection as per drawing

-Alreyami weld-o-let, plug design

Flange

-in flange (slip on)check small & large hub thk ,pipe to flange weld thk, gasket material, rigidity applied, bolt material,bolt dia,pcd,bolt load, corrosion and type of flange and all dimensions with drawing

Supports

-If vessel with support lug on support leg perform two support structures design

-Decide whether skirt or leg are applicable for a vessel depend on dia and weight.

-Seismic G loading options and it’s value

-saddle Base plate length=I.D *0.885

Saddle Base plate width=I.D *0.075

Saddle Base plate thickness=I.D *0.006

-Skirt opening r.f pad requirement calculation

-skirt opening stress calculation